Mercurial > dropbear
annotate libtomcrypt/src/hashes/sha2/sha256.c @ 1930:299f4f19ba19
Add /usr/sbin and /sbin to default root PATH
When dropbear is used in a very restricted environment (such as in a
initrd), the default user shell is often also very restricted
and doesn't take care of setting the PATH so the user ends up
with the PATH set by dropbear. Unfortunately, dropbear always
sets "/usr/bin:/bin" as default PATH even for the root user
which should have /usr/sbin and /sbin too.
For a concrete instance of this problem, see the "Remote Unlocking"
section in this tutorial: https://paxswill.com/blog/2013/11/04/encrypted-raspberry-pi/
It speaks of a bug in the initramfs script because it's written "blkid"
instead of "/sbin/blkid"... this is just because the scripts from the
initramfs do not expect to have a PATH without the sbin directories and
because dropbear is not setting the PATH appropriately for the root user.
I'm thus suggesting to use the attached patch to fix this misbehaviour (I
did not test it, but it's easy enough). It might seem anecdotic but
multiple Kali users have been bitten by this.
From https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=903403
author | Raphael Hertzog <hertzog@debian.org> |
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date | Mon, 09 Jul 2018 16:27:53 +0200 |
parents | 6dba84798cd5 |
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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 #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 |
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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 |
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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]; |
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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 |
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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: $Format:%ai$ */ |