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annotate app/src/main/java/ch/ethz/ssh2/crypto/digest/HMAC.java @ 514:947ea334735d default tip
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| author | Carl Byington <carl@five-ten-sg.com> |
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| date | Fri, 10 Feb 2023 19:13:58 -0700 |
| parents | 7953570e5210 |
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| rev | line source |
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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.digest; |
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6 |
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7 import java.security.DigestException; |
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8 |
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9 /** |
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10 * HMAC. |
| 307 | 11 * |
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12 * @author Christian Plattner |
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13 * @version 2.50, 03/15/10 |
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14 */ |
| 307 | 15 public final class HMAC implements Digest { |
| 16 Digest md; | |
| 17 byte[] k_xor_ipad; | |
| 18 byte[] k_xor_opad; | |
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19 |
| 307 | 20 byte[] tmp; |
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21 |
| 307 | 22 int size; |
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23 |
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24 public HMAC(Digest md, byte[] key, int digestsize, int blocksize) throws DigestException { |
| 307 | 25 this.md = md; |
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26 this.size = digestsize; |
| 307 | 27 tmp = new byte[md.getDigestLength()]; |
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28 k_xor_ipad = new byte[blocksize]; |
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29 k_xor_opad = new byte[blocksize]; |
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30 |
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31 if (key.length > blocksize) { |
| 307 | 32 md.reset(); |
| 33 md.update(key); | |
| 34 md.digest(tmp); | |
| 35 key = tmp; | |
| 36 } | |
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37 |
| 307 | 38 System.arraycopy(key, 0, k_xor_ipad, 0, key.length); |
| 39 System.arraycopy(key, 0, k_xor_opad, 0, key.length); | |
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40 |
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41 for (int i = 0; i < blocksize; i++) { |
| 307 | 42 k_xor_ipad[i] ^= 0x36; |
| 43 k_xor_opad[i] ^= 0x5C; | |
| 44 } | |
| 45 | |
| 46 md.update(k_xor_ipad); | |
| 47 } | |
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48 |
| 307 | 49 public final int getDigestLength() { |
| 50 return size; | |
| 51 } | |
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52 |
| 307 | 53 public final void update(byte b) { |
| 54 md.update(b); | |
| 55 } | |
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56 |
| 307 | 57 public final void update(byte[] b) { |
| 58 md.update(b); | |
| 59 } | |
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60 |
| 307 | 61 public final void update(byte[] b, int off, int len) { |
| 62 md.update(b, off, len); | |
| 63 } | |
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64 |
| 307 | 65 public final void reset() { |
| 66 md.reset(); | |
| 67 md.update(k_xor_ipad); | |
| 68 } | |
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69 |
| 307 | 70 public final void digest(byte[] out) throws DigestException { |
| 71 digest(out, 0); | |
| 72 } | |
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73 |
| 307 | 74 public final void digest(byte[] out, int off) throws DigestException { |
| 75 md.digest(tmp); | |
| 76 md.update(k_xor_opad); | |
| 77 md.update(tmp); | |
| 78 md.digest(tmp); | |
| 79 System.arraycopy(tmp, 0, out, off, size); | |
| 80 md.update(k_xor_ipad); | |
| 81 } | |
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82 } |