Mercurial > dropbear
annotate src/encauth/gcm/gcm_init.c @ 209:39d5d58461d6 libtomcrypt-orig LTC_1.05
Import of libtomcrypt 1.05
| author | Matt Johnston <matt@ucc.asn.au> |
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| date | Wed, 06 Jul 2005 03:53:40 +0000 |
| parents | 1c15b283127b |
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| rev | line source |
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis |
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2 * |
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3 * LibTomCrypt is a library that provides various cryptographic |
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4 * algorithms in a highly modular and flexible manner. |
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5 * |
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6 * The library is free for all purposes without any express |
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7 * guarantee it works. |
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8 * |
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9 * Tom St Denis, [email protected], http://libtomcrypt.org |
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10 */ |
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11 |
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12 /** |
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13 @file gcm_init.c |
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14 GCM implementation, initialize state, by Tom St Denis |
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15 */ |
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16 #include "tomcrypt.h" |
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17 |
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18 #ifdef GCM_MODE |
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19 |
| 209 | 20 #ifdef GCM_TABLES |
| 21 | |
| 22 /* this is x*2^128 mod p(x) ... the results are 16 bytes each stored in a packed format. Since only the | |
| 23 * lower 16 bits are not zero'ed I removed the upper 14 bytes */ | |
| 24 static const unsigned char gcm_shift_table[256*2] = { | |
| 25 0x00, 0x00, 0x01, 0xc2, 0x03, 0x84, 0x02, 0x46, 0x07, 0x08, 0x06, 0xca, 0x04, 0x8c, 0x05, 0x4e, | |
| 26 0x0e, 0x10, 0x0f, 0xd2, 0x0d, 0x94, 0x0c, 0x56, 0x09, 0x18, 0x08, 0xda, 0x0a, 0x9c, 0x0b, 0x5e, | |
| 27 0x1c, 0x20, 0x1d, 0xe2, 0x1f, 0xa4, 0x1e, 0x66, 0x1b, 0x28, 0x1a, 0xea, 0x18, 0xac, 0x19, 0x6e, | |
| 28 0x12, 0x30, 0x13, 0xf2, 0x11, 0xb4, 0x10, 0x76, 0x15, 0x38, 0x14, 0xfa, 0x16, 0xbc, 0x17, 0x7e, | |
| 29 0x38, 0x40, 0x39, 0x82, 0x3b, 0xc4, 0x3a, 0x06, 0x3f, 0x48, 0x3e, 0x8a, 0x3c, 0xcc, 0x3d, 0x0e, | |
| 30 0x36, 0x50, 0x37, 0x92, 0x35, 0xd4, 0x34, 0x16, 0x31, 0x58, 0x30, 0x9a, 0x32, 0xdc, 0x33, 0x1e, | |
| 31 0x24, 0x60, 0x25, 0xa2, 0x27, 0xe4, 0x26, 0x26, 0x23, 0x68, 0x22, 0xaa, 0x20, 0xec, 0x21, 0x2e, | |
| 32 0x2a, 0x70, 0x2b, 0xb2, 0x29, 0xf4, 0x28, 0x36, 0x2d, 0x78, 0x2c, 0xba, 0x2e, 0xfc, 0x2f, 0x3e, | |
| 33 0x70, 0x80, 0x71, 0x42, 0x73, 0x04, 0x72, 0xc6, 0x77, 0x88, 0x76, 0x4a, 0x74, 0x0c, 0x75, 0xce, | |
| 34 0x7e, 0x90, 0x7f, 0x52, 0x7d, 0x14, 0x7c, 0xd6, 0x79, 0x98, 0x78, 0x5a, 0x7a, 0x1c, 0x7b, 0xde, | |
| 35 0x6c, 0xa0, 0x6d, 0x62, 0x6f, 0x24, 0x6e, 0xe6, 0x6b, 0xa8, 0x6a, 0x6a, 0x68, 0x2c, 0x69, 0xee, | |
| 36 0x62, 0xb0, 0x63, 0x72, 0x61, 0x34, 0x60, 0xf6, 0x65, 0xb8, 0x64, 0x7a, 0x66, 0x3c, 0x67, 0xfe, | |
| 37 0x48, 0xc0, 0x49, 0x02, 0x4b, 0x44, 0x4a, 0x86, 0x4f, 0xc8, 0x4e, 0x0a, 0x4c, 0x4c, 0x4d, 0x8e, | |
| 38 0x46, 0xd0, 0x47, 0x12, 0x45, 0x54, 0x44, 0x96, 0x41, 0xd8, 0x40, 0x1a, 0x42, 0x5c, 0x43, 0x9e, | |
| 39 0x54, 0xe0, 0x55, 0x22, 0x57, 0x64, 0x56, 0xa6, 0x53, 0xe8, 0x52, 0x2a, 0x50, 0x6c, 0x51, 0xae, | |
| 40 0x5a, 0xf0, 0x5b, 0x32, 0x59, 0x74, 0x58, 0xb6, 0x5d, 0xf8, 0x5c, 0x3a, 0x5e, 0x7c, 0x5f, 0xbe, | |
| 41 0xe1, 0x00, 0xe0, 0xc2, 0xe2, 0x84, 0xe3, 0x46, 0xe6, 0x08, 0xe7, 0xca, 0xe5, 0x8c, 0xe4, 0x4e, | |
| 42 0xef, 0x10, 0xee, 0xd2, 0xec, 0x94, 0xed, 0x56, 0xe8, 0x18, 0xe9, 0xda, 0xeb, 0x9c, 0xea, 0x5e, | |
| 43 0xfd, 0x20, 0xfc, 0xe2, 0xfe, 0xa4, 0xff, 0x66, 0xfa, 0x28, 0xfb, 0xea, 0xf9, 0xac, 0xf8, 0x6e, | |
| 44 0xf3, 0x30, 0xf2, 0xf2, 0xf0, 0xb4, 0xf1, 0x76, 0xf4, 0x38, 0xf5, 0xfa, 0xf7, 0xbc, 0xf6, 0x7e, | |
| 45 0xd9, 0x40, 0xd8, 0x82, 0xda, 0xc4, 0xdb, 0x06, 0xde, 0x48, 0xdf, 0x8a, 0xdd, 0xcc, 0xdc, 0x0e, | |
| 46 0xd7, 0x50, 0xd6, 0x92, 0xd4, 0xd4, 0xd5, 0x16, 0xd0, 0x58, 0xd1, 0x9a, 0xd3, 0xdc, 0xd2, 0x1e, | |
| 47 0xc5, 0x60, 0xc4, 0xa2, 0xc6, 0xe4, 0xc7, 0x26, 0xc2, 0x68, 0xc3, 0xaa, 0xc1, 0xec, 0xc0, 0x2e, | |
| 48 0xcb, 0x70, 0xca, 0xb2, 0xc8, 0xf4, 0xc9, 0x36, 0xcc, 0x78, 0xcd, 0xba, 0xcf, 0xfc, 0xce, 0x3e, | |
| 49 0x91, 0x80, 0x90, 0x42, 0x92, 0x04, 0x93, 0xc6, 0x96, 0x88, 0x97, 0x4a, 0x95, 0x0c, 0x94, 0xce, | |
| 50 0x9f, 0x90, 0x9e, 0x52, 0x9c, 0x14, 0x9d, 0xd6, 0x98, 0x98, 0x99, 0x5a, 0x9b, 0x1c, 0x9a, 0xde, | |
| 51 0x8d, 0xa0, 0x8c, 0x62, 0x8e, 0x24, 0x8f, 0xe6, 0x8a, 0xa8, 0x8b, 0x6a, 0x89, 0x2c, 0x88, 0xee, | |
| 52 0x83, 0xb0, 0x82, 0x72, 0x80, 0x34, 0x81, 0xf6, 0x84, 0xb8, 0x85, 0x7a, 0x87, 0x3c, 0x86, 0xfe, | |
| 53 0xa9, 0xc0, 0xa8, 0x02, 0xaa, 0x44, 0xab, 0x86, 0xae, 0xc8, 0xaf, 0x0a, 0xad, 0x4c, 0xac, 0x8e, | |
| 54 0xa7, 0xd0, 0xa6, 0x12, 0xa4, 0x54, 0xa5, 0x96, 0xa0, 0xd8, 0xa1, 0x1a, 0xa3, 0x5c, 0xa2, 0x9e, | |
| 55 0xb5, 0xe0, 0xb4, 0x22, 0xb6, 0x64, 0xb7, 0xa6, 0xb2, 0xe8, 0xb3, 0x2a, 0xb1, 0x6c, 0xb0, 0xae, | |
| 56 0xbb, 0xf0, 0xba, 0x32, 0xb8, 0x74, 0xb9, 0xb6, 0xbc, 0xf8, 0xbd, 0x3a, 0xbf, 0x7c, 0xbe, 0xbe }; | |
| 57 | |
| 58 #endif | |
| 59 | |
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60 /** |
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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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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 |
| 209 | 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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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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86 /* is cipher valid? */ |
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87 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) { |
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88 return err; |
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89 } |
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90 if (cipher_descriptor[cipher].block_length != 16) { |
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91 return CRYPT_INVALID_CIPHER; |
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92 } |
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93 |
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94 /* schedule key */ |
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95 if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, &gcm->K)) != CRYPT_OK) { |
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96 return err; |
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97 } |
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98 |
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99 /* H = E(0) */ |
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100 zeromem(B, 16); |
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101 cipher_descriptor[cipher].ecb_encrypt(B, gcm->H, &gcm->K); |
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102 |
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103 /* setup state */ |
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104 zeromem(gcm->buf, sizeof(gcm->buf)); |
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105 zeromem(gcm->X, sizeof(gcm->X)); |
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106 gcm->cipher = cipher; |
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107 gcm->mode = GCM_MODE_IV; |
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108 gcm->ivmode = 0; |
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109 gcm->buflen = 0; |
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110 gcm->totlen = 0; |
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111 gcm->pttotlen = 0; |
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112 |
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113 #ifdef GCM_TABLES |
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114 /* setup tables */ |
| 209 | 115 |
| 116 /* generate the first table as it has no shifting (from which we make the other tables) */ | |
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117 zeromem(B, 16); |
| 209 | 118 for (y = 0; y < 256; y++) { |
| 119 B[0] = y; | |
| 120 gcm_gf_mult(gcm->H, B, &gcm->PC[0][y][0]); | |
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121 } |
| 209 | 122 |
| 123 /* now generate the rest of the tables based the previous table */ | |
| 124 for (x = 1; x < 16; x++) { | |
| 125 for (y = 0; y < 256; y++) { | |
| 126 /* now shift it right by 8 bits */ | |
| 127 t = gcm->PC[x-1][y][15]; | |
| 128 for (z = 15; z > 0; z--) { | |
| 129 gcm->PC[x][y][z] = gcm->PC[x-1][y][z-1]; | |
| 130 } | |
| 131 gcm->PC[x][y][0] = gcm_shift_table[t<<1]; | |
| 132 gcm->PC[x][y][1] ^= gcm_shift_table[(t<<1)+1]; | |
| 133 } | |
| 134 } | |
| 135 | |
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136 #endif |
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137 |
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Import of libtomcrypt 1.02 with manual path rename rearrangement etc
Matt Johnston <matt@ucc.asn.au>
parents:
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138 return CRYPT_OK; |
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Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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139 } |
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Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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parents:
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140 |
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Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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141 #endif |
| 209 | 142 |
| 143 /* $Source: /cvs/libtom/libtomcrypt/src/encauth/gcm/gcm_init.c,v $ */ | |
| 144 /* $Revision: 1.15 $ */ | |
| 145 /* $Date: 2005/05/21 15:05:19 $ */ |