annotate src/ch/ethz/ssh2/crypto/cipher/CipherInputStream.java @ 307:071eccdff8ea ganymed

fix java formatting
author Carl Byington <carl@five-ten-sg.com>
date Wed, 30 Jul 2014 14:16:58 -0700
parents 91a31873c42a
children
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1 /*
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2 * Copyright (c) 2006-2011 Christian Plattner. All rights reserved.
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3 * Please refer to the LICENSE.txt for licensing details.
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4 */
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5 package ch.ethz.ssh2.crypto.cipher;
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6
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7 import java.io.IOException;
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8 import java.io.InputStream;
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9
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10 /**
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11 * CipherInputStream.
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12 *
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13 * @author Christian Plattner
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14 * @version $Id: CipherInputStream.java 11 2011-05-27 14:14:06Z dkocher@sudo.ch $
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15 */
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16 public class CipherInputStream {
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17 BlockCipher currentCipher;
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18 InputStream bi;
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19 byte[] buffer;
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20 byte[] enc;
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21 int blockSize;
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22 int pos;
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23
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24 /*
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25 * We cannot use java.io.BufferedInputStream, since that is not available in
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26 * J2ME. Everything could be improved alot here.
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27 */
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28
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29 private static final int BUFF_SIZE = 8192;
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30 byte[] input_buffer = new byte[BUFF_SIZE];
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31 int input_buffer_pos = 0;
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32 int input_buffer_size = 0;
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33
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34 public CipherInputStream(BlockCipher tc, InputStream bi) {
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35 this.bi = bi;
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36 changeCipher(tc);
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37 }
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38
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39 private int fill_buffer() throws IOException {
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40 input_buffer_pos = 0;
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41 input_buffer_size = 0;
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42 input_buffer_size = bi.read(input_buffer, 0, BUFF_SIZE);
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43 return input_buffer_size;
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44 }
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45
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46 private int internal_read(byte[] b, int off, int len) throws IOException {
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47 if (input_buffer_size < 0) {
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48 return -1;
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49 }
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50
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51 if (input_buffer_pos >= input_buffer_size) {
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52 if (fill_buffer() <= 0) {
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53 return -1;
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54 }
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55 }
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56
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57 int avail = input_buffer_size - input_buffer_pos;
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58 int thiscopy = (len > avail) ? avail : len;
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59 System.arraycopy(input_buffer, input_buffer_pos, b, off, thiscopy);
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60 input_buffer_pos += thiscopy;
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61 return thiscopy;
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62 }
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63
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64 public void changeCipher(BlockCipher bc) {
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65 this.currentCipher = bc;
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66 blockSize = bc.getBlockSize();
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67 buffer = new byte[blockSize];
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68 enc = new byte[blockSize];
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69 pos = blockSize;
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70 }
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71
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72 private void getBlock() throws IOException {
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73 int n = 0;
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74
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75 while (n < blockSize) {
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76 int len = internal_read(enc, n, blockSize - n);
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77
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78 if (len < 0) {
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79 throw new IOException("Cannot read full block, EOF reached.");
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80 }
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81
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82 n += len;
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83 }
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84
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85 try {
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86 currentCipher.transformBlock(enc, 0, buffer, 0);
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87 }
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88 catch (Exception e) {
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89 throw new IOException("Error while decrypting block.");
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90 }
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91
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92 pos = 0;
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93 }
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94
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95 public int read(byte[] dst) throws IOException {
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96 return read(dst, 0, dst.length);
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97 }
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98
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99 public int read(byte[] dst, int off, int len) throws IOException {
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100 int count = 0;
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101
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102 while (len > 0) {
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103 if (pos >= blockSize) {
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104 getBlock();
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105 }
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106
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107 int avail = blockSize - pos;
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108 int copy = Math.min(avail, len);
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109 System.arraycopy(buffer, pos, dst, off, copy);
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110 pos += copy;
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111 off += copy;
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112 len -= copy;
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113 count += copy;
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114 }
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115
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116 return count;
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117 }
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118
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119 public int read() throws IOException {
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120 if (pos >= blockSize) {
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121 getBlock();
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122 }
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123
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124 return buffer[pos++] & 0xff;
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125 }
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126
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127 public int readPlain(byte[] b, int off, int len) throws IOException {
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128 if (pos != blockSize) {
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129 throw new IOException("Cannot read plain since crypto buffer is not aligned.");
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130 }
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131
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132 int n = 0;
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133
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134 while (n < len) {
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135 int cnt = internal_read(b, off + n, len - n);
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136
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137 if (cnt < 0) {
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138 throw new IOException("Cannot fill buffer, EOF reached.");
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139 }
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140
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141 n += cnt;
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142 }
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143
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144 return n;
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145 }
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146 }