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annotate src/ch/ethz/ssh2/signature/ECDSASHA2Verify.java @ 298:ab3a99f11a36 ganymed

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add ecdsa key support everywhere
author Carl Byington <carl@five-ten-sg.com>
date Tue, 29 Jul 2014 18:01:08 -0700
parents e1c445af8e46
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /**
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2 *
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3 */
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4 package ch.ethz.ssh2.signature;
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5
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6 import java.io.ByteArrayOutputStream;
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7 import java.io.IOException;
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8 import java.io.OutputStream;
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9 import java.math.BigInteger;
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10 import java.security.InvalidKeyException;
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11 import java.security.KeyFactory;
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12 import java.security.NoSuchAlgorithmException;
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13 import java.security.Signature;
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14 import java.security.SignatureException;
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15 import java.security.interfaces.ECPrivateKey;
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16 import java.security.interfaces.ECPublicKey;
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17 import java.security.spec.ECFieldFp;
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18 import java.security.spec.ECParameterSpec;
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19 import java.security.spec.ECPoint;
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20 import java.security.spec.ECPublicKeySpec;
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21 import java.security.spec.EllipticCurve;
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22 import java.security.spec.InvalidKeySpecException;
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23 import java.security.spec.KeySpec;
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24 import java.util.Map;
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25 import java.util.TreeMap;
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26
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27 import ch.ethz.ssh2.log.Logger;
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28 import ch.ethz.ssh2.packets.TypesReader;
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29 import ch.ethz.ssh2.packets.TypesWriter;
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30
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31 /**
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32 * @author Kenny Root
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33 *
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34 */
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35 public class ECDSASHA2Verify {
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36 private static final Logger log = Logger.getLogger(ECDSASHA2Verify.class);
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37
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38 public static final String ECDSA_SHA2_PREFIX = "ecdsa-sha2-";
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39
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40 private static final String NISTP256 = "nistp256";
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41 private static final String NISTP256_OID = "1.2.840.10045.3.1.7";
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42 private static final String NISTP384 = "nistp384";
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43 private static final String NISTP384_OID = "1.3.132.0.34";
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44 private static final String NISTP521 = "nistp521";
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45 private static final String NISTP521_OID = "1.3.132.0.35";
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46
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47 private static final Map<String, ECParameterSpec> CURVES = new TreeMap<String, ECParameterSpec>();
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48 static {
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49 CURVES.put(NISTP256, EllipticCurves.nistp256);
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50 CURVES.put(NISTP384, EllipticCurves.nistp384);
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51 CURVES.put(NISTP521, EllipticCurves.nistp521);
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52 }
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53
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54 private static final Map<Integer, String> CURVE_SIZES = new TreeMap<Integer, String>();
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55 static {
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56 CURVE_SIZES.put(256, NISTP256);
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57 CURVE_SIZES.put(384, NISTP384);
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58 CURVE_SIZES.put(521, NISTP521);
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59 }
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60
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61 private static final Map<String, String> CURVE_OIDS = new TreeMap<String, String>();
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62 static {
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63 CURVE_OIDS.put(NISTP256_OID, NISTP256);
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64 CURVE_OIDS.put(NISTP384_OID, NISTP256);
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65 CURVE_OIDS.put(NISTP521_OID, NISTP256);
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66 }
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67
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68 public static int[] getCurveSizes() {
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69 int[] keys = new int[CURVE_SIZES.size()];
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70 int i = 0;
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71
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72 for (Integer n : CURVE_SIZES.keySet().toArray(new Integer[keys.length])) {
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73 keys[i++] = n;
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74 }
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75
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76 return keys;
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77 }
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78
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79 public static ECParameterSpec getCurveForSize(int size) {
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80 final String name = CURVE_SIZES.get(size);
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81
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82 if (name == null) {
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83 return null;
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84 }
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85
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86 return CURVES.get(name);
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87 }
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88
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89 public static ECPublicKey decodeSSHECDSAPublicKey(byte[] key) throws IOException {
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90 TypesReader tr = new TypesReader(key);
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91 String key_format = tr.readString();
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92
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93 if (key_format.startsWith(ECDSA_SHA2_PREFIX) == false)
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94 throw new IllegalArgumentException("This is not an ECDSA public key");
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95
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96 String curveName = tr.readString();
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97 byte[] groupBytes = tr.readByteString();
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98
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99 if (tr.remain() != 0)
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100 throw new IOException("Padding in ECDSA public key!");
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101
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102 if (key_format.equals(ECDSA_SHA2_PREFIX + curveName) == false) {
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103 throw new IOException("Key format is inconsistent with curve name: " + key_format
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104 + " != " + curveName);
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105 }
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106
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107 ECParameterSpec params = CURVES.get(curveName);
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108
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109 if (params == null) {
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110 throw new IOException("Curve is not supported: " + curveName);
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111 }
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112
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113 ECPoint group = ECDSASHA2Verify.decodeECPoint(groupBytes, params.getCurve());
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114
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115 if (group == null) {
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116 throw new IOException("Invalid ECDSA group");
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117 }
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118
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119 KeySpec keySpec = new ECPublicKeySpec(group, params);
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120
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121 try {
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122 KeyFactory kf = KeyFactory.getInstance("EC");
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123 return (ECPublicKey) kf.generatePublic(keySpec);
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124 }
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125 catch (NoSuchAlgorithmException nsae) {
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126 IOException ioe = new IOException("No EC KeyFactory available");
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127 ioe.initCause(nsae);
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128 throw ioe;
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129 }
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130 catch (InvalidKeySpecException ikse) {
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131 IOException ioe = new IOException("No EC KeyFactory available");
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132 ioe.initCause(ikse);
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133 throw ioe;
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134 }
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135 }
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136
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137 public static byte[] encodeSSHECDSAPublicKey(ECPublicKey key) throws IOException {
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138 TypesWriter tw = new TypesWriter();
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139 String curveName = getCurveName(key.getParams());
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140 String keyFormat = ECDSA_SHA2_PREFIX + curveName;
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diff changeset
141 tw.writeString(keyFormat);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
142 tw.writeString(curveName);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
143 byte[] encoded = encodeECPoint(key.getW(), key.getParams().getCurve());
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
144 tw.writeString(encoded, 0, encoded.length);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
145 return tw.getBytes();
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
146 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
147
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
148 public static String getCurveName(ECParameterSpec params) throws IOException {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
149 int fieldSize = getCurveSize(params);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
150 final String curveName = getCurveName(fieldSize);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
151
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
152 if (curveName == null) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
153 throw new IOException("invalid curve size " + fieldSize);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
154 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
155
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
156 return curveName;
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
157 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
158
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
159 public static String getCurveName(int fieldSize) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
160 String curveName = CURVE_SIZES.get(fieldSize);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
161
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
162 if (curveName == null) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
163 return null;
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
164 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
165
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
166 return curveName;
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
167 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
168
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
169 public static int getCurveSize(ECParameterSpec params) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
170 return params.getCurve().getField().getFieldSize();
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
171 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
172
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
173 public static ECParameterSpec getCurveForOID(String oid) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
174 String name = CURVE_OIDS.get(oid);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
175
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
176 if (name == null)
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
177 return null;
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
178
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
179 return CURVES.get(name);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
180 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
181
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
182 public static byte[] decodeSSHECDSASignature(byte[] sig) throws IOException {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
183 byte[] rsArray = null;
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
184 TypesReader tr = new TypesReader(sig);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
185 String sig_format = tr.readString();
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
186
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
187 if (sig_format.startsWith(ECDSA_SHA2_PREFIX) == false)
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
188 throw new IOException("Peer sent wrong signature format");
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
189
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
190 String curveName = sig_format.substring(ECDSA_SHA2_PREFIX.length());
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
191
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
192 if (CURVES.containsKey(curveName) == false) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
193 throw new IOException("Unsupported curve: " + curveName);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
194 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
195
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
196 rsArray = tr.readByteString();
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
197
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
198 if (tr.remain() != 0)
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
199 throw new IOException("Padding in ECDSA signature!");
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
200
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
201 byte[] rArray;
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
202 byte[] sArray;
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
203 {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
204 TypesReader rsReader = new TypesReader(rsArray);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
205 rArray = rsReader.readMPINT().toByteArray();
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
206 sArray = rsReader.readMPINT().toByteArray();
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
207 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
208 int first = rArray.length;
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
209 int second = sArray.length;
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
210
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
211 /* We can't have the high bit set, so add an extra zero at the beginning if so. */
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
212 if ((rArray[0] & 0x80) != 0) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
213 first++;
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
214 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
215
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
216 if ((sArray[0] & 0x80) != 0) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
217 second++;
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
218 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
219
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
220 /* Calculate total output length */
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
221 ByteArrayOutputStream os = new ByteArrayOutputStream(6 + first + second);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
222 /* ASN.1 SEQUENCE tag */
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
223 os.write(0x30);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
224 /* Size of SEQUENCE */
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
225 writeLength(4 + first + second, os);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
226 /* ASN.1 INTEGER tag */
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
227 os.write(0x02);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
228 /* "r" INTEGER length */
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
229 writeLength(first, os);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
230
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
231 /* Copy in the "r" INTEGER */
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
232 if (first != rArray.length) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
233 os.write(0x00);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
234 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
235
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
236 os.write(rArray);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
237 /* ASN.1 INTEGER tag */
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
238 os.write(0x02);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
239 /* "s" INTEGER length */
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
240 writeLength(second, os);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
241
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
242 /* Copy in the "s" INTEGER */
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
243 if (second != sArray.length) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
244 os.write(0x00);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
245 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
246
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
247 os.write(sArray);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
248 return os.toByteArray();
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
249 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
250
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
251 private static final void writeLength(int length, OutputStream os) throws IOException {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
252 if (length <= 0x7F) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
253 os.write(length);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
254 return;
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
255 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
256
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
257 int numOctets = 0;
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
258 int lenCopy = length;
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
259
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
260 while (lenCopy != 0) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
261 lenCopy >>>= 8;
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
262 numOctets++;
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
263 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
264
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
265 os.write(0x80 | numOctets);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
266
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
267 for (int i = (numOctets - 1) * 8; i >= 0; i -= 8) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
268 os.write((byte)(length >> i));
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
269 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
270 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
271
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
272 public static byte[] encodeSSHECDSASignature(byte[] sig, ECParameterSpec params) throws IOException {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
273 TypesWriter tw = new TypesWriter();
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
274 String curveName = getCurveName(params);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
275 tw.writeString(ECDSA_SHA2_PREFIX + curveName);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
276
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
277 if ((sig[0] != 0x30) || (sig[1] != sig.length - 2) || (sig[2] != 0x02)) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
278 throw new IOException("Invalid signature format");
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
279 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
280
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
281 int rLength = sig[3];
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
282
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
283 if ((rLength + 6 > sig.length) || (sig[4 + rLength] != 0x02)) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
284 throw new IOException("Invalid signature format");
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
285 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
286
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
287 int sLength = sig[5 + rLength];
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
288
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
289 if (6 + rLength + sLength > sig.length) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
290 throw new IOException("Invalid signature format");
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
291 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
292
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
293 byte[] rArray = new byte[rLength];
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
294 byte[] sArray = new byte[sLength];
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
295 System.arraycopy(sig, 4, rArray, 0, rLength);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
296 System.arraycopy(sig, 6 + rLength, sArray, 0, sLength);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
297 BigInteger r = new BigInteger(rArray);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
298 BigInteger s = new BigInteger(sArray);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
299 // Write the <r,s> to its own types writer.
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
300 TypesWriter rsWriter = new TypesWriter();
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
301 rsWriter.writeMPInt(r);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
302 rsWriter.writeMPInt(s);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
303 byte[] encoded = rsWriter.getBytes();
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
304 tw.writeString(encoded, 0, encoded.length);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
305 return tw.getBytes();
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
306 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
307
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
308 public static byte[] generateSignature(byte[] message, ECPrivateKey pk) throws IOException {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
309 final String algo = getSignatureAlgorithmForParams(pk.getParams());
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
310
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
311 try {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
312 Signature s = Signature.getInstance(algo);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
313 s.initSign(pk);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
314 s.update(message);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
315 return s.sign();
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
316 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
317 catch (NoSuchAlgorithmException e) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
318 IOException ex = new IOException();
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
319 ex.initCause(e);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
320 throw ex;
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
321 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
322 catch (InvalidKeyException e) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
323 IOException ex = new IOException();
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
324 ex.initCause(e);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
325 throw ex;
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
326 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
327 catch (SignatureException e) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
328 IOException ex = new IOException();
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
329 ex.initCause(e);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
330 throw ex;
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
331 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
332 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
333
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
334 public static boolean verifySignature(byte[] message, byte[] ds, ECPublicKey dpk) throws IOException {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
335 final String algo = getSignatureAlgorithmForParams(dpk.getParams());
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
336
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
337 try {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
338 Signature s = Signature.getInstance(algo);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
339 s.initVerify(dpk);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
340 s.update(message);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
341 return s.verify(ds);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
342 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
343 catch (NoSuchAlgorithmException e) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
344 IOException ex = new IOException("No such algorithm");
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
345 ex.initCause(e);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
346 throw ex;
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
347 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
348 catch (InvalidKeyException e) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
349 IOException ex = new IOException("No such algorithm");
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
350 ex.initCause(e);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
351 throw ex;
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
352 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
353 catch (SignatureException e) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
354 IOException ex = new IOException();
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
355 ex.initCause(e);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
356 throw ex;
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
357 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
358 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
359
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
360 private static String getSignatureAlgorithmForParams(ECParameterSpec params) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
361 int size = getCurveSize(params);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
362
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
363 if (size <= 256) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
364 return "SHA256withECDSA";
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
365 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
366 else if (size <= 384) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
367 return "SHA384withECDSA";
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
368 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
369 else {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
370 return "SHA512withECDSA";
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
371 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
372 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
373
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
374 public static String getDigestAlgorithmForParams(ECParameterSpec params) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
375 int size = getCurveSize(params);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
376
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
377 if (size <= 256) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
378 return "SHA256";
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
379 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
380 else if (size <= 384) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
381 return "SHA384";
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
382 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
383 else {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
384 return "SHA512";
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
385 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
386 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
387
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
388 /**
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
389 * Decode an OctetString to EllipticCurvePoint according to SECG 2.3.4
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
390 */
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
391 public static ECPoint decodeECPoint(byte[] M, EllipticCurve curve) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
392 if (M.length == 0) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
393 return null;
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
394 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
395
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
396 // M has len 2 ceil(log_2(q)/8) + 1 ?
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
397 int elementSize = (curve.getField().getFieldSize() + 7) / 8;
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
398
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
399 if (M.length != 2 * elementSize + 1) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
400 return null;
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
401 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
402
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
403 // step 3.2
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
404 if (M[0] != 0x04) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
405 return null;
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
406 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
407
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
408 // Step 3.3
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
409 byte[] xp = new byte[elementSize];
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
410 System.arraycopy(M, 1, xp, 0, elementSize);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
411 // Step 3.4
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
412 byte[] yp = new byte[elementSize];
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
413 System.arraycopy(M, 1 + elementSize, yp, 0, elementSize);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
414 ECPoint P = new ECPoint(new BigInteger(1, xp), new BigInteger(1, yp));
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
415 // TODO check point 3.5
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
416 // Step 3.6
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
417 return P;
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
418 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
419
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
420 /**
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
421 * Encode EllipticCurvePoint to an OctetString
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
422 */
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
423 public static byte[] encodeECPoint(ECPoint group, EllipticCurve curve) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
424 // M has len 2 ceil(log_2(q)/8) + 1 ?
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
425 int elementSize = (curve.getField().getFieldSize() + 7) / 8;
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
426 byte[] M = new byte[2 * elementSize + 1];
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
427 // Uncompressed format
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
428 M[0] = 0x04;
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
429 {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
430 byte[] affineX = removeLeadingZeroes(group.getAffineX().toByteArray());
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
431 System.arraycopy(affineX, 0, M, 1 + elementSize - affineX.length, affineX.length);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
432 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
433 {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
434 byte[] affineY = removeLeadingZeroes(group.getAffineY().toByteArray());
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
435 System.arraycopy(affineY, 0, M, 1 + elementSize + elementSize - affineY.length,
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
436 affineY.length);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
437 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
438 return M;
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
439 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
440
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
441 private static byte[] removeLeadingZeroes(byte[] input) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
442 if (input[0] != 0x00) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
443 return input;
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
444 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
445
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
446 int pos = 1;
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
447
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
448 while (pos < input.length - 1 && input[pos] == 0x00) {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
449 pos++;
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
450 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
451
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
452 byte[] output = new byte[input.length - pos];
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
453 System.arraycopy(input, pos, output, 0, output.length);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
454 return output;
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
455 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
456
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
457 public static class EllipticCurves {
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
458 public static ECParameterSpec nistp256 = new ECParameterSpec(
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
459 new EllipticCurve(
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
460 new ECFieldFp(new BigInteger("FFFFFFFF00000001000000000000000000000000FFFFFFFFFFFFFFFFFFFFFFFF", 16)),
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
461 new BigInteger("FFFFFFFF00000001000000000000000000000000FFFFFFFFFFFFFFFFFFFFFFFC", 16),
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
462 new BigInteger("5ac635d8aa3a93e7b3ebbd55769886bc651d06b0cc53b0f63bce3c3e27d2604b", 16)),
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
463 new ECPoint(new BigInteger("6B17D1F2E12C4247F8BCE6E563A440F277037D812DEB33A0F4A13945D898C296", 16),
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
464 new BigInteger("4FE342E2FE1A7F9B8EE7EB4A7C0F9E162BCE33576B315ECECBB6406837BF51F5", 16)),
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
465 new BigInteger("FFFFFFFF00000000FFFFFFFFFFFFFFFFBCE6FAADA7179E84F3B9CAC2FC632551", 16),
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
466 1);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
467
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
468 public static ECParameterSpec nistp384 = new ECParameterSpec(
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
469 new EllipticCurve(
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
470 new ECFieldFp(new BigInteger("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFF0000000000000000FFFFFFFF", 16)),
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
471 new BigInteger("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFF0000000000000000FFFFFFFC", 16),
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
472 new BigInteger("B3312FA7E23EE7E4988E056BE3F82D19181D9C6EFE8141120314088F5013875AC656398D8A2ED19D2A85C8EDD3EC2AEF", 16)),
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
473 new ECPoint(new BigInteger("AA87CA22BE8B05378EB1C71EF320AD746E1D3B628BA79B9859F741E082542A385502F25DBF55296C3A545E3872760AB7", 16),
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
474 new BigInteger("3617DE4A96262C6F5D9E98BF9292DC29F8F41DBD289A147CE9DA3113B5F0B8C00A60B1CE1D7E819D7A431D7C90EA0E5F", 16)),
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
475 new BigInteger("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFC7634D81F4372DDF581A0DB248B0A77AECEC196ACCC52973", 16),
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
476 1);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
477
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
478 public static ECParameterSpec nistp521 = new ECParameterSpec(
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
479 new EllipticCurve(
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
480 new ECFieldFp(new BigInteger("01FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF", 16)),
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
481 new BigInteger("01FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFC", 16),
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
482 new BigInteger("0051953EB9618E1C9A1F929A21A0B68540EEA2DA725B99B315F3B8B489918EF109E156193951EC7E937B1652C0BD3BB1BF073573DF883D2C34F1EF451FD46B503F00", 16)),
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
483 new ECPoint(new BigInteger("00C6858E06B70404E9CD9E3ECB662395B4429C648139053FB521F828AF606B4D3DBAA14B5E77EFE75928FE1DC127A2FFA8DE3348B3C1856A429BF97E7E31C2E5BD66", 16),
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
484 new BigInteger("011839296A789A3BC0045C8A5FB42C7D1BD998F54449579B446817AFBD17273E662C97EE72995EF42640C550B9013FAD0761353C7086A272C24088BE94769FD16650", 16)),
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
485 new BigInteger("01FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFA51868783BF2F966B7FCC0148F709A5D03BB5C9B8899C47AEBB6FB71E91386409", 16),
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
486 1);
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
487 }
82bd20cb0d1d start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
488 }