Mercurial > dropbear
annotate libtomcrypt/src/hashes/sha2/sha256.c @ 1626:9bd597d29590
merge
author | Matt Johnston <matt@ucc.asn.au> |
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date | Wed, 14 Nov 2018 22:58:35 +0800 |
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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 #include "tomcrypt.h" |
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10 |
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11 /** |
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12 @file sha256.c |
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13 LTC_SHA256 by Tom St Denis |
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14 */ |
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15 |
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16 #ifdef LTC_SHA256 |
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17 |
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18 const struct ltc_hash_descriptor sha256_desc = |
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19 { |
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20 "sha256", |
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21 0, |
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22 32, |
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23 64, |
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24 |
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25 /* OID */ |
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26 { 2, 16, 840, 1, 101, 3, 4, 2, 1, }, |
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27 9, |
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28 |
285
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29 &sha256_init, |
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30 &sha256_process, |
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31 &sha256_done, |
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32 &sha256_test, |
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33 NULL |
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34 }; |
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35 |
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36 #ifdef LTC_SMALL_CODE |
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37 /* the K array */ |
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38 static const ulong32 K[64] = { |
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39 0x428a2f98UL, 0x71374491UL, 0xb5c0fbcfUL, 0xe9b5dba5UL, 0x3956c25bUL, |
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40 0x59f111f1UL, 0x923f82a4UL, 0xab1c5ed5UL, 0xd807aa98UL, 0x12835b01UL, |
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41 0x243185beUL, 0x550c7dc3UL, 0x72be5d74UL, 0x80deb1feUL, 0x9bdc06a7UL, |
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42 0xc19bf174UL, 0xe49b69c1UL, 0xefbe4786UL, 0x0fc19dc6UL, 0x240ca1ccUL, |
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43 0x2de92c6fUL, 0x4a7484aaUL, 0x5cb0a9dcUL, 0x76f988daUL, 0x983e5152UL, |
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44 0xa831c66dUL, 0xb00327c8UL, 0xbf597fc7UL, 0xc6e00bf3UL, 0xd5a79147UL, |
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45 0x06ca6351UL, 0x14292967UL, 0x27b70a85UL, 0x2e1b2138UL, 0x4d2c6dfcUL, |
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46 0x53380d13UL, 0x650a7354UL, 0x766a0abbUL, 0x81c2c92eUL, 0x92722c85UL, |
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47 0xa2bfe8a1UL, 0xa81a664bUL, 0xc24b8b70UL, 0xc76c51a3UL, 0xd192e819UL, |
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48 0xd6990624UL, 0xf40e3585UL, 0x106aa070UL, 0x19a4c116UL, 0x1e376c08UL, |
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49 0x2748774cUL, 0x34b0bcb5UL, 0x391c0cb3UL, 0x4ed8aa4aUL, 0x5b9cca4fUL, |
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50 0x682e6ff3UL, 0x748f82eeUL, 0x78a5636fUL, 0x84c87814UL, 0x8cc70208UL, |
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51 0x90befffaUL, 0xa4506cebUL, 0xbef9a3f7UL, 0xc67178f2UL |
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52 }; |
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53 #endif |
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54 |
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55 /* Various logical functions */ |
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56 #define Ch(x,y,z) (z ^ (x & (y ^ z))) |
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57 #define Maj(x,y,z) (((x | y) & z) | (x & y)) |
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58 #define S(x, n) RORc((x),(n)) |
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59 #define R(x, n) (((x)&0xFFFFFFFFUL)>>(n)) |
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60 #define Sigma0(x) (S(x, 2) ^ S(x, 13) ^ S(x, 22)) |
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61 #define Sigma1(x) (S(x, 6) ^ S(x, 11) ^ S(x, 25)) |
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62 #define Gamma0(x) (S(x, 7) ^ S(x, 18) ^ R(x, 3)) |
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63 #define Gamma1(x) (S(x, 17) ^ S(x, 19) ^ R(x, 10)) |
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64 |
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65 /* compress 512-bits */ |
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66 #ifdef LTC_CLEAN_STACK |
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67 static int _sha256_compress(hash_state * md, unsigned char *buf) |
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68 #else |
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69 static int sha256_compress(hash_state * md, unsigned char *buf) |
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70 #endif |
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71 { |
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72 ulong32 S[8], W[64], t0, t1; |
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73 #ifdef LTC_SMALL_CODE |
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74 ulong32 t; |
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75 #endif |
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76 int i; |
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77 |
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78 /* copy state into S */ |
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79 for (i = 0; i < 8; i++) { |
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80 S[i] = md->sha256.state[i]; |
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81 } |
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82 |
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83 /* copy the state into 512-bits into W[0..15] */ |
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84 for (i = 0; i < 16; i++) { |
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85 LOAD32H(W[i], buf + (4*i)); |
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86 } |
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87 |
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88 /* fill W[16..63] */ |
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89 for (i = 16; i < 64; i++) { |
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90 W[i] = Gamma1(W[i - 2]) + W[i - 7] + Gamma0(W[i - 15]) + W[i - 16]; |
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91 } |
285
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92 |
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93 /* Compress */ |
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94 #ifdef LTC_SMALL_CODE |
285
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95 #define RND(a,b,c,d,e,f,g,h,i) \ |
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96 t0 = h + Sigma1(e) + Ch(e, f, g) + K[i] + W[i]; \ |
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97 t1 = Sigma0(a) + Maj(a, b, c); \ |
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98 d += t0; \ |
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99 h = t0 + t1; |
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100 |
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101 for (i = 0; i < 64; ++i) { |
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102 RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],i); |
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103 t = S[7]; S[7] = S[6]; S[6] = S[5]; S[5] = S[4]; |
285
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104 S[4] = S[3]; S[3] = S[2]; S[2] = S[1]; S[1] = S[0]; S[0] = t; |
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105 } |
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106 #else |
285
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107 #define RND(a,b,c,d,e,f,g,h,i,ki) \ |
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108 t0 = h + Sigma1(e) + Ch(e, f, g) + ki + W[i]; \ |
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109 t1 = Sigma0(a) + Maj(a, b, c); \ |
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110 d += t0; \ |
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111 h = t0 + t1; |
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112 |
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113 RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],0,0x428a2f98); |
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114 RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],1,0x71374491); |
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115 RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],2,0xb5c0fbcf); |
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116 RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],3,0xe9b5dba5); |
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117 RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],4,0x3956c25b); |
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118 RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],5,0x59f111f1); |
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119 RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],6,0x923f82a4); |
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120 RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],7,0xab1c5ed5); |
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121 RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],8,0xd807aa98); |
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122 RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],9,0x12835b01); |
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123 RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],10,0x243185be); |
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124 RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],11,0x550c7dc3); |
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125 RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],12,0x72be5d74); |
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126 RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],13,0x80deb1fe); |
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127 RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],14,0x9bdc06a7); |
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128 RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],15,0xc19bf174); |
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129 RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],16,0xe49b69c1); |
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130 RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],17,0xefbe4786); |
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131 RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],18,0x0fc19dc6); |
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132 RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],19,0x240ca1cc); |
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133 RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],20,0x2de92c6f); |
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134 RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],21,0x4a7484aa); |
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135 RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],22,0x5cb0a9dc); |
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136 RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],23,0x76f988da); |
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137 RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],24,0x983e5152); |
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138 RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],25,0xa831c66d); |
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139 RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],26,0xb00327c8); |
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140 RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],27,0xbf597fc7); |
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141 RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],28,0xc6e00bf3); |
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142 RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],29,0xd5a79147); |
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143 RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],30,0x06ca6351); |
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144 RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],31,0x14292967); |
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145 RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],32,0x27b70a85); |
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146 RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],33,0x2e1b2138); |
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147 RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],34,0x4d2c6dfc); |
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148 RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],35,0x53380d13); |
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149 RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],36,0x650a7354); |
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150 RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],37,0x766a0abb); |
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151 RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],38,0x81c2c92e); |
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152 RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],39,0x92722c85); |
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153 RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],40,0xa2bfe8a1); |
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154 RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],41,0xa81a664b); |
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155 RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],42,0xc24b8b70); |
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156 RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],43,0xc76c51a3); |
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157 RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],44,0xd192e819); |
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158 RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],45,0xd6990624); |
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159 RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],46,0xf40e3585); |
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160 RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],47,0x106aa070); |
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161 RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],48,0x19a4c116); |
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162 RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],49,0x1e376c08); |
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163 RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],50,0x2748774c); |
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164 RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],51,0x34b0bcb5); |
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165 RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],52,0x391c0cb3); |
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166 RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],53,0x4ed8aa4a); |
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167 RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],54,0x5b9cca4f); |
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168 RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],55,0x682e6ff3); |
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169 RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],56,0x748f82ee); |
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170 RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],57,0x78a5636f); |
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171 RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],58,0x84c87814); |
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172 RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],59,0x8cc70208); |
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173 RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],60,0x90befffa); |
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174 RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],61,0xa4506ceb); |
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175 RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],62,0xbef9a3f7); |
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176 RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],63,0xc67178f2); |
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177 |
1471
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178 #undef RND |
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179 |
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180 #endif |
285
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181 |
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182 /* feedback */ |
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183 for (i = 0; i < 8; i++) { |
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184 md->sha256.state[i] = md->sha256.state[i] + S[i]; |
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185 } |
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186 return CRYPT_OK; |
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187 } |
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188 |
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189 #ifdef LTC_CLEAN_STACK |
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190 static int sha256_compress(hash_state * md, unsigned char *buf) |
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191 { |
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192 int err; |
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193 err = _sha256_compress(md, buf); |
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194 burn_stack(sizeof(ulong32) * 74); |
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195 return err; |
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196 } |
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197 #endif |
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198 |
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199 /** |
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200 Initialize the hash state |
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201 @param md The hash state you wish to initialize |
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202 @return CRYPT_OK if successful |
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203 */ |
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204 int sha256_init(hash_state * md) |
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205 { |
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206 LTC_ARGCHK(md != NULL); |
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207 |
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208 md->sha256.curlen = 0; |
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209 md->sha256.length = 0; |
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210 md->sha256.state[0] = 0x6A09E667UL; |
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211 md->sha256.state[1] = 0xBB67AE85UL; |
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212 md->sha256.state[2] = 0x3C6EF372UL; |
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213 md->sha256.state[3] = 0xA54FF53AUL; |
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214 md->sha256.state[4] = 0x510E527FUL; |
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215 md->sha256.state[5] = 0x9B05688CUL; |
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216 md->sha256.state[6] = 0x1F83D9ABUL; |
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217 md->sha256.state[7] = 0x5BE0CD19UL; |
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218 return CRYPT_OK; |
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219 } |
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220 |
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221 /** |
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222 Process a block of memory though the hash |
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223 @param md The hash state |
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224 @param in The data to hash |
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225 @param inlen The length of the data (octets) |
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226 @return CRYPT_OK if successful |
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227 */ |
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228 HASH_PROCESS(sha256_process, sha256_compress, sha256, 64) |
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229 |
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230 /** |
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231 Terminate the hash to get the digest |
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232 @param md The hash state |
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233 @param out [out] The destination of the hash (32 bytes) |
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234 @return CRYPT_OK if successful |
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235 */ |
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236 int sha256_done(hash_state * md, unsigned char *out) |
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237 { |
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238 int i; |
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239 |
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240 LTC_ARGCHK(md != NULL); |
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241 LTC_ARGCHK(out != NULL); |
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242 |
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243 if (md->sha256.curlen >= sizeof(md->sha256.buf)) { |
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244 return CRYPT_INVALID_ARG; |
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245 } |
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246 |
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247 |
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248 /* increase the length of the message */ |
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249 md->sha256.length += md->sha256.curlen * 8; |
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250 |
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251 /* append the '1' bit */ |
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252 md->sha256.buf[md->sha256.curlen++] = (unsigned char)0x80; |
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253 |
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254 /* if the length is currently above 56 bytes we append zeros |
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255 * then compress. Then we can fall back to padding zeros and length |
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256 * encoding like normal. |
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257 */ |
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258 if (md->sha256.curlen > 56) { |
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259 while (md->sha256.curlen < 64) { |
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260 md->sha256.buf[md->sha256.curlen++] = (unsigned char)0; |
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261 } |
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262 sha256_compress(md, md->sha256.buf); |
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263 md->sha256.curlen = 0; |
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264 } |
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265 |
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266 /* pad upto 56 bytes of zeroes */ |
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267 while (md->sha256.curlen < 56) { |
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268 md->sha256.buf[md->sha256.curlen++] = (unsigned char)0; |
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269 } |
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270 |
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271 /* store length */ |
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272 STORE64H(md->sha256.length, md->sha256.buf+56); |
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273 sha256_compress(md, md->sha256.buf); |
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274 |
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275 /* copy output */ |
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276 for (i = 0; i < 8; i++) { |
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277 STORE32H(md->sha256.state[i], out+(4*i)); |
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278 } |
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279 #ifdef LTC_CLEAN_STACK |
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280 zeromem(md, sizeof(hash_state)); |
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281 #endif |
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282 return CRYPT_OK; |
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283 } |
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284 |
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285 /** |
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286 Self-test the hash |
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287 @return CRYPT_OK if successful, CRYPT_NOP if self-tests have been disabled |
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288 */ |
285
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289 int sha256_test(void) |
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290 { |
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291 #ifndef LTC_TEST |
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292 return CRYPT_NOP; |
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293 #else |
285
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294 static const struct { |
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295 const char *msg; |
285
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296 unsigned char hash[32]; |
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297 } tests[] = { |
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298 { "abc", |
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299 { 0xba, 0x78, 0x16, 0xbf, 0x8f, 0x01, 0xcf, 0xea, |
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300 0x41, 0x41, 0x40, 0xde, 0x5d, 0xae, 0x22, 0x23, |
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301 0xb0, 0x03, 0x61, 0xa3, 0x96, 0x17, 0x7a, 0x9c, |
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302 0xb4, 0x10, 0xff, 0x61, 0xf2, 0x00, 0x15, 0xad } |
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303 }, |
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304 { "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq", |
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305 { 0x24, 0x8d, 0x6a, 0x61, 0xd2, 0x06, 0x38, 0xb8, |
285
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306 0xe5, 0xc0, 0x26, 0x93, 0x0c, 0x3e, 0x60, 0x39, |
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307 0xa3, 0x3c, 0xe4, 0x59, 0x64, 0xff, 0x21, 0x67, |
285
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308 0xf6, 0xec, 0xed, 0xd4, 0x19, 0xdb, 0x06, 0xc1 } |
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309 }, |
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310 }; |
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311 |
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312 int i; |
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313 unsigned char tmp[32]; |
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314 hash_state md; |
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315 |
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316 for (i = 0; i < (int)(sizeof(tests) / sizeof(tests[0])); i++) { |
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317 sha256_init(&md); |
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318 sha256_process(&md, (unsigned char*)tests[i].msg, (unsigned long)strlen(tests[i].msg)); |
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319 sha256_done(&md, tmp); |
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320 if (compare_testvector(tmp, sizeof(tmp), tests[i].hash, sizeof(tests[i].hash), "SHA256", i)) { |
285
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321 return CRYPT_FAIL_TESTVECTOR; |
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322 } |
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323 } |
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324 return CRYPT_OK; |
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325 #endif |
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326 } |
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327 |
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328 #endif |
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329 |
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330 |
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331 |
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332 /* ref: $Format:%D$ */ |
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333 /* git commit: $Format:%H$ */ |
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334 /* commit time: $Format:%ai$ */ |