Mercurial > dropbear

annotate src/encauth/gcm/gcm_init.c @ 280:59400faa4b44 libtomcrypt-orig libtomcrypt-1.05

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Re-import libtomcrypt 1.05 for cleaner propagating. From crypt-1.05.tar.bz2, SHA1 of 88250202bb51570dc64f7e8f1c943cda9479258f
author Matt Johnston <matt@ucc.asn.au>
date Wed, 08 Mar 2006 12:58:00 +0000
parents
children d5faf4814ddb
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
280
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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2 *
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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3 * LibTomCrypt is a library that provides various cryptographic
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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4 * algorithms in a highly modular and flexible manner.
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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5 *
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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6 * The library is free for all purposes without any express
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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7 * guarantee it works.
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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8 *
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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9 * Tom St Denis, [email protected], http://libtomcrypt.org
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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10 */
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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11
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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12 /**
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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13 @file gcm_init.c
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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14 GCM implementation, initialize state, by Tom St Denis
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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15 */
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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16 #include "tomcrypt.h"
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17
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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18 #ifdef GCM_MODE
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19
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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20 #ifdef GCM_TABLES
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21
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22 /* this is x*2^128 mod p(x) ... the results are 16 bytes each stored in a packed format. Since only the
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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23 * lower 16 bits are not zero'ed I removed the upper 14 bytes */
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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24 static const unsigned char gcm_shift_table[256*2] = {
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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25 0x00, 0x00, 0x01, 0xc2, 0x03, 0x84, 0x02, 0x46, 0x07, 0x08, 0x06, 0xca, 0x04, 0x8c, 0x05, 0x4e,
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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26 0x0e, 0x10, 0x0f, 0xd2, 0x0d, 0x94, 0x0c, 0x56, 0x09, 0x18, 0x08, 0xda, 0x0a, 0x9c, 0x0b, 0x5e,
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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27 0x1c, 0x20, 0x1d, 0xe2, 0x1f, 0xa4, 0x1e, 0x66, 0x1b, 0x28, 0x1a, 0xea, 0x18, 0xac, 0x19, 0x6e,
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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28 0x12, 0x30, 0x13, 0xf2, 0x11, 0xb4, 0x10, 0x76, 0x15, 0x38, 0x14, 0xfa, 0x16, 0xbc, 0x17, 0x7e,
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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29 0x38, 0x40, 0x39, 0x82, 0x3b, 0xc4, 0x3a, 0x06, 0x3f, 0x48, 0x3e, 0x8a, 0x3c, 0xcc, 0x3d, 0x0e,
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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30 0x36, 0x50, 0x37, 0x92, 0x35, 0xd4, 0x34, 0x16, 0x31, 0x58, 0x30, 0x9a, 0x32, 0xdc, 0x33, 0x1e,
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31 0x24, 0x60, 0x25, 0xa2, 0x27, 0xe4, 0x26, 0x26, 0x23, 0x68, 0x22, 0xaa, 0x20, 0xec, 0x21, 0x2e,
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32 0x2a, 0x70, 0x2b, 0xb2, 0x29, 0xf4, 0x28, 0x36, 0x2d, 0x78, 0x2c, 0xba, 0x2e, 0xfc, 0x2f, 0x3e,
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33 0x70, 0x80, 0x71, 0x42, 0x73, 0x04, 0x72, 0xc6, 0x77, 0x88, 0x76, 0x4a, 0x74, 0x0c, 0x75, 0xce,
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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34 0x7e, 0x90, 0x7f, 0x52, 0x7d, 0x14, 0x7c, 0xd6, 0x79, 0x98, 0x78, 0x5a, 0x7a, 0x1c, 0x7b, 0xde,
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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35 0x6c, 0xa0, 0x6d, 0x62, 0x6f, 0x24, 0x6e, 0xe6, 0x6b, 0xa8, 0x6a, 0x6a, 0x68, 0x2c, 0x69, 0xee,
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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36 0x62, 0xb0, 0x63, 0x72, 0x61, 0x34, 0x60, 0xf6, 0x65, 0xb8, 0x64, 0x7a, 0x66, 0x3c, 0x67, 0xfe,
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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37 0x48, 0xc0, 0x49, 0x02, 0x4b, 0x44, 0x4a, 0x86, 0x4f, 0xc8, 0x4e, 0x0a, 0x4c, 0x4c, 0x4d, 0x8e,
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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38 0x46, 0xd0, 0x47, 0x12, 0x45, 0x54, 0x44, 0x96, 0x41, 0xd8, 0x40, 0x1a, 0x42, 0x5c, 0x43, 0x9e,
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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39 0x54, 0xe0, 0x55, 0x22, 0x57, 0x64, 0x56, 0xa6, 0x53, 0xe8, 0x52, 0x2a, 0x50, 0x6c, 0x51, 0xae,
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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40 0x5a, 0xf0, 0x5b, 0x32, 0x59, 0x74, 0x58, 0xb6, 0x5d, 0xf8, 0x5c, 0x3a, 0x5e, 0x7c, 0x5f, 0xbe,
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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41 0xe1, 0x00, 0xe0, 0xc2, 0xe2, 0x84, 0xe3, 0x46, 0xe6, 0x08, 0xe7, 0xca, 0xe5, 0x8c, 0xe4, 0x4e,
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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42 0xef, 0x10, 0xee, 0xd2, 0xec, 0x94, 0xed, 0x56, 0xe8, 0x18, 0xe9, 0xda, 0xeb, 0x9c, 0xea, 0x5e,
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
parents:
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43 0xfd, 0x20, 0xfc, 0xe2, 0xfe, 0xa4, 0xff, 0x66, 0xfa, 0x28, 0xfb, 0xea, 0xf9, 0xac, 0xf8, 0x6e,
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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44 0xf3, 0x30, 0xf2, 0xf2, 0xf0, 0xb4, 0xf1, 0x76, 0xf4, 0x38, 0xf5, 0xfa, 0xf7, 0xbc, 0xf6, 0x7e,
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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45 0xd9, 0x40, 0xd8, 0x82, 0xda, 0xc4, 0xdb, 0x06, 0xde, 0x48, 0xdf, 0x8a, 0xdd, 0xcc, 0xdc, 0x0e,
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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46 0xd7, 0x50, 0xd6, 0x92, 0xd4, 0xd4, 0xd5, 0x16, 0xd0, 0x58, 0xd1, 0x9a, 0xd3, 0xdc, 0xd2, 0x1e,
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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47 0xc5, 0x60, 0xc4, 0xa2, 0xc6, 0xe4, 0xc7, 0x26, 0xc2, 0x68, 0xc3, 0xaa, 0xc1, 0xec, 0xc0, 0x2e,
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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48 0xcb, 0x70, 0xca, 0xb2, 0xc8, 0xf4, 0xc9, 0x36, 0xcc, 0x78, 0xcd, 0xba, 0xcf, 0xfc, 0xce, 0x3e,
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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49 0x91, 0x80, 0x90, 0x42, 0x92, 0x04, 0x93, 0xc6, 0x96, 0x88, 0x97, 0x4a, 0x95, 0x0c, 0x94, 0xce,
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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50 0x9f, 0x90, 0x9e, 0x52, 0x9c, 0x14, 0x9d, 0xd6, 0x98, 0x98, 0x99, 0x5a, 0x9b, 0x1c, 0x9a, 0xde,
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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51 0x8d, 0xa0, 0x8c, 0x62, 0x8e, 0x24, 0x8f, 0xe6, 0x8a, 0xa8, 0x8b, 0x6a, 0x89, 0x2c, 0x88, 0xee,
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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52 0x83, 0xb0, 0x82, 0x72, 0x80, 0x34, 0x81, 0xf6, 0x84, 0xb8, 0x85, 0x7a, 0x87, 0x3c, 0x86, 0xfe,
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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53 0xa9, 0xc0, 0xa8, 0x02, 0xaa, 0x44, 0xab, 0x86, 0xae, 0xc8, 0xaf, 0x0a, 0xad, 0x4c, 0xac, 0x8e,
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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54 0xa7, 0xd0, 0xa6, 0x12, 0xa4, 0x54, 0xa5, 0x96, 0xa0, 0xd8, 0xa1, 0x1a, 0xa3, 0x5c, 0xa2, 0x9e,
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55 0xb5, 0xe0, 0xb4, 0x22, 0xb6, 0x64, 0xb7, 0xa6, 0xb2, 0xe8, 0xb3, 0x2a, 0xb1, 0x6c, 0xb0, 0xae,
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
Matt Johnston <matt@ucc.asn.au>
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56 0xbb, 0xf0, 0xba, 0x32, 0xb8, 0x74, 0xb9, 0xb6, 0xbc, 0xf8, 0xbd, 0x3a, 0xbf, 0x7c, 0xbe, 0xbe };
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57
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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58 #endif
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59
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Matt Johnston <matt@ucc.asn.au>
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60 /**
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Matt Johnston <matt@ucc.asn.au>
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61 Initialize a GCM state
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62 @param gcm The GCM state to initialize
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63 @param cipher The index of the cipher to use
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64 @param key The secret key
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65 @param keylen The length of the secret key
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66 @return CRYPT_OK on success
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67 */
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68 int gcm_init(gcm_state *gcm, int cipher,
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69 const unsigned char *key, int keylen)
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Matt Johnston <matt@ucc.asn.au>
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70 {
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71 int err;
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72 unsigned char B[16];
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73 #ifdef GCM_TABLES
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74 int x, y, z, t;
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75 #endif
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76
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77 LTC_ARGCHK(gcm != NULL);
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78 LTC_ARGCHK(key != NULL);
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79
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Matt Johnston <matt@ucc.asn.au>
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80 #ifdef LTC_FAST
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81 if (16 % sizeof(LTC_FAST_TYPE)) {
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82 return CRYPT_INVALID_ARG;
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83 }
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84 #endif
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85
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Matt Johnston <matt@ucc.asn.au>
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86 /* is cipher valid? */
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Matt Johnston <matt@ucc.asn.au>
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87 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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Matt Johnston <matt@ucc.asn.au>
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88 return err;
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Matt Johnston <matt@ucc.asn.au>
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89 }
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Matt Johnston <matt@ucc.asn.au>
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90 if (cipher_descriptor[cipher].block_length != 16) {
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Matt Johnston <matt@ucc.asn.au>
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91 return CRYPT_INVALID_CIPHER;
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Matt Johnston <matt@ucc.asn.au>
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92 }
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93
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Matt Johnston <matt@ucc.asn.au>
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94 /* schedule key */
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Matt Johnston <matt@ucc.asn.au>
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95 if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, &gcm->K)) != CRYPT_OK) {
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Matt Johnston <matt@ucc.asn.au>
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96 return err;
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Matt Johnston <matt@ucc.asn.au>
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97 }
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98
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Matt Johnston <matt@ucc.asn.au>
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99 /* H = E(0) */
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Matt Johnston <matt@ucc.asn.au>
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100 zeromem(B, 16);
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Matt Johnston <matt@ucc.asn.au>
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101 cipher_descriptor[cipher].ecb_encrypt(B, gcm->H, &gcm->K);
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102
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Matt Johnston <matt@ucc.asn.au>
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103 /* setup state */
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Matt Johnston <matt@ucc.asn.au>
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104 zeromem(gcm->buf, sizeof(gcm->buf));
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Matt Johnston <matt@ucc.asn.au>
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105 zeromem(gcm->X, sizeof(gcm->X));
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106 gcm->cipher = cipher;
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Matt Johnston <matt@ucc.asn.au>
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107 gcm->mode = GCM_MODE_IV;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
108 gcm->ivmode = 0;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
109 gcm->buflen = 0;
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Matt Johnston <matt@ucc.asn.au>
parents:
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110 gcm->totlen = 0;
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Matt Johnston <matt@ucc.asn.au>
parents:
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111 gcm->pttotlen = 0;
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Matt Johnston <matt@ucc.asn.au>
parents:
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112
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Matt Johnston <matt@ucc.asn.au>
parents:
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113 #ifdef GCM_TABLES
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Matt Johnston <matt@ucc.asn.au>
parents:
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114 /* setup tables */
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Matt Johnston <matt@ucc.asn.au>
parents:
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115
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Matt Johnston <matt@ucc.asn.au>
parents:
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116 /* generate the first table as it has no shifting (from which we make the other tables) */
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Matt Johnston <matt@ucc.asn.au>
parents:
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117 zeromem(B, 16);
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Matt Johnston <matt@ucc.asn.au>
parents:
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118 for (y = 0; y < 256; y++) {
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Matt Johnston <matt@ucc.asn.au>
parents:
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119 B[0] = y;
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Matt Johnston <matt@ucc.asn.au>
parents:
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120 gcm_gf_mult(gcm->H, B, &gcm->PC[0][y][0]);
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Matt Johnston <matt@ucc.asn.au>
parents:
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121 }
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Matt Johnston <matt@ucc.asn.au>
parents:
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122
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Matt Johnston <matt@ucc.asn.au>
parents:
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123 /* now generate the rest of the tables based the previous table */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
124 for (x = 1; x < 16; x++) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
125 for (y = 0; y < 256; y++) {
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Matt Johnston <matt@ucc.asn.au>
parents:
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126 /* now shift it right by 8 bits */
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Matt Johnston <matt@ucc.asn.au>
parents:
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127 t = gcm->PC[x-1][y][15];
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
128 for (z = 15; z > 0; z--) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
129 gcm->PC[x][y][z] = gcm->PC[x-1][y][z-1];
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Matt Johnston <matt@ucc.asn.au>
parents:
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130 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
131 gcm->PC[x][y][0] = gcm_shift_table[t<<1];
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Matt Johnston <matt@ucc.asn.au>
parents:
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132 gcm->PC[x][y][1] ^= gcm_shift_table[(t<<1)+1];
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Matt Johnston <matt@ucc.asn.au>
parents:
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133 }
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Matt Johnston <matt@ucc.asn.au>
parents:
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134 }
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Matt Johnston <matt@ucc.asn.au>
parents:
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135
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Matt Johnston <matt@ucc.asn.au>
parents:
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136 #endif
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Matt Johnston <matt@ucc.asn.au>
parents:
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137
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Matt Johnston <matt@ucc.asn.au>
parents:
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138 return CRYPT_OK;
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Matt Johnston <matt@ucc.asn.au>
parents:
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139 }
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Matt Johnston <matt@ucc.asn.au>
parents:
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140
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Matt Johnston <matt@ucc.asn.au>
parents:
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141 #endif
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Matt Johnston <matt@ucc.asn.au>
parents:
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142
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
143 /* $Source: /cvs/libtom/libtomcrypt/src/encauth/gcm/gcm_init.c,v $ */
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Matt Johnston <matt@ucc.asn.au>
parents:
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144 /* $Revision: 1.15 $ */
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Matt Johnston <matt@ucc.asn.au>
parents:
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145 /* $Date: 2005/05/21 15:05:19 $ */