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annotate src/ch/ethz/ssh2/crypto/digest/HMAC.java @ 381:95188bd4badb
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| author | Carl Byington <carl@five-ten-sg.com> |
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| date | Wed, 06 Aug 2014 10:38:50 -0700 |
| parents | 071eccdff8ea |
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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 |
| 307 | 24 public HMAC(Digest md, byte[] key, int size) throws DigestException { |
| 25 this.md = md; | |
| 26 this.size = size; | |
| 27 tmp = new byte[md.getDigestLength()]; | |
| 28 final int BLOCKSIZE = 64; | |
| 29 k_xor_ipad = new byte[BLOCKSIZE]; | |
| 30 k_xor_opad = new byte[BLOCKSIZE]; | |
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31 |
| 307 | 32 if (key.length > BLOCKSIZE) { |
| 33 md.reset(); | |
| 34 md.update(key); | |
| 35 md.digest(tmp); | |
| 36 key = tmp; | |
| 37 } | |
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38 |
| 307 | 39 System.arraycopy(key, 0, k_xor_ipad, 0, key.length); |
| 40 System.arraycopy(key, 0, k_xor_opad, 0, key.length); | |
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41 |
| 307 | 42 for (int i = 0; i < BLOCKSIZE; i++) { |
| 43 k_xor_ipad[i] ^= 0x36; | |
| 44 k_xor_opad[i] ^= 0x5C; | |
| 45 } | |
| 46 | |
| 47 md.update(k_xor_ipad); | |
| 48 } | |
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49 |
| 307 | 50 public final int getDigestLength() { |
| 51 return size; | |
| 52 } | |
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53 |
| 307 | 54 public final void update(byte b) { |
| 55 md.update(b); | |
| 56 } | |
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57 |
| 307 | 58 public final void update(byte[] b) { |
| 59 md.update(b); | |
| 60 } | |
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61 |
| 307 | 62 public final void update(byte[] b, int off, int len) { |
| 63 md.update(b, off, len); | |
| 64 } | |
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65 |
| 307 | 66 public final void reset() { |
| 67 md.reset(); | |
| 68 md.update(k_xor_ipad); | |
| 69 } | |
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70 |
| 307 | 71 public final void digest(byte[] out) throws DigestException { |
| 72 digest(out, 0); | |
| 73 } | |
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74 |
| 307 | 75 public final void digest(byte[] out, int off) throws DigestException { |
| 76 md.digest(tmp); | |
| 77 md.update(k_xor_opad); | |
| 78 md.update(tmp); | |
| 79 md.digest(tmp); | |
| 80 System.arraycopy(tmp, 0, out, off, size); | |
| 81 md.update(k_xor_ipad); | |
| 82 } | |
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83 } |