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annotate sha1.c @ 154:b4c6e7f276e9 libtomcrypt

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Makefile.in: don't compile things we don't need
author Matt Johnston <matt@ucc.asn.au>
date Mon, 20 Dec 2004 14:46:40 +0000
parents c2b93763dac9
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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0
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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 /* SHA1 code by Tom St Denis */
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13 #include "mycrypt.h"
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14
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15 #ifdef SHA1
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16
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17 const struct _hash_descriptor sha1_desc =
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18 {
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19 "sha1",
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20 2,
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21 20,
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22 64,
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23
147
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24 #if 0
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25 /* matt */
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26 /* DER identifier */
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27 { 0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2B, 0x0E,
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28 0x03, 0x02, 0x1A, 0x05, 0x00, 0x04, 0x14 },
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29 15,
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30 #endif
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31
0
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32 &sha1_init,
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33 &sha1_process,
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34 &sha1_done,
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35 &sha1_test
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36 };
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37
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38 #define F0(x,y,z) (z ^ (x & (y ^ z)))
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39 #define F1(x,y,z) (x ^ y ^ z)
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40 #define F2(x,y,z) ((x & y) | (z & (x | y)))
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41 #define F3(x,y,z) (x ^ y ^ z)
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42
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43 #ifdef CLEAN_STACK
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44 static int _sha1_compress(hash_state *md, unsigned char *buf)
0
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45 #else
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46 static int sha1_compress(hash_state *md, unsigned char *buf)
0
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47 #endif
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48 {
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49 ulong32 a,b,c,d,e,W[80],i;
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50 #ifdef SMALL_CODE
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51 ulong32 t;
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52 #endif
0
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53
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54 /* copy the state into 512-bits into W[0..15] */
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55 for (i = 0; i < 16; i++) {
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56 LOAD32H(W[i], buf + (4*i));
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57 }
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58
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59 /* copy state */
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60 a = md->sha1.state[0];
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61 b = md->sha1.state[1];
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62 c = md->sha1.state[2];
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63 d = md->sha1.state[3];
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64 e = md->sha1.state[4];
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65
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66 /* expand it */
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67 for (i = 16; i < 80; i++) {
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68 W[i] = ROL(W[i-3] ^ W[i-8] ^ W[i-14] ^ W[i-16], 1);
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69 }
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70
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71 /* compress */
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72 /* round one */
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73 #define FF0(a,b,c,d,e,i) e = (ROL(a, 5) + F0(b,c,d) + e + W[i] + 0x5a827999UL); b = ROL(b, 30);
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74 #define FF1(a,b,c,d,e,i) e = (ROL(a, 5) + F1(b,c,d) + e + W[i] + 0x6ed9eba1UL); b = ROL(b, 30);
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75 #define FF2(a,b,c,d,e,i) e = (ROL(a, 5) + F2(b,c,d) + e + W[i] + 0x8f1bbcdcUL); b = ROL(b, 30);
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76 #define FF3(a,b,c,d,e,i) e = (ROL(a, 5) + F3(b,c,d) + e + W[i] + 0xca62c1d6UL); b = ROL(b, 30);
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77
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78 #ifdef SMALL_CODE
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79
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80 for (i = 0; i < 20; ) {
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81 FF0(a,b,c,d,e,i++); t = e; e = d; d = c; c = b; b = a; a = t;
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82 }
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83
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84 for (; i < 40; ) {
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85 FF1(a,b,c,d,e,i++); t = e; e = d; d = c; c = b; b = a; a = t;
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86 }
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87
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88 for (; i < 60; ) {
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89 FF2(a,b,c,d,e,i++); t = e; e = d; d = c; c = b; b = a; a = t;
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90 }
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91
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92 for (; i < 80; ) {
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93 FF3(a,b,c,d,e,i++); t = e; e = d; d = c; c = b; b = a; a = t;
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94 }
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95
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96 #else
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97
0
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98 for (i = 0; i < 20; ) {
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99 FF0(a,b,c,d,e,i++);
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100 FF0(e,a,b,c,d,i++);
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101 FF0(d,e,a,b,c,i++);
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102 FF0(c,d,e,a,b,i++);
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103 FF0(b,c,d,e,a,i++);
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104 }
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105
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106 /* round two */
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107 for (; i < 40; ) {
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108 FF1(a,b,c,d,e,i++);
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109 FF1(e,a,b,c,d,i++);
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110 FF1(d,e,a,b,c,i++);
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111 FF1(c,d,e,a,b,i++);
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112 FF1(b,c,d,e,a,i++);
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113 }
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114
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115 /* round three */
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116 for (; i < 60; ) {
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117 FF2(a,b,c,d,e,i++);
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118 FF2(e,a,b,c,d,i++);
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119 FF2(d,e,a,b,c,i++);
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120 FF2(c,d,e,a,b,i++);
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121 FF2(b,c,d,e,a,i++);
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122 }
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123
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124 /* round four */
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125 for (; i < 80; ) {
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126 FF3(a,b,c,d,e,i++);
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127 FF3(e,a,b,c,d,i++);
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128 FF3(d,e,a,b,c,i++);
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129 FF3(c,d,e,a,b,i++);
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130 FF3(b,c,d,e,a,i++);
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131 }
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132 #endif
0
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133
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134 #undef FF0
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135 #undef FF1
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136 #undef FF2
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137 #undef FF3
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138
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139 /* store */
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140 md->sha1.state[0] = md->sha1.state[0] + a;
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141 md->sha1.state[1] = md->sha1.state[1] + b;
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142 md->sha1.state[2] = md->sha1.state[2] + c;
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143 md->sha1.state[3] = md->sha1.state[3] + d;
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144 md->sha1.state[4] = md->sha1.state[4] + e;
143
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145
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146 return CRYPT_OK;
0
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147 }
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148
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149 #ifdef CLEAN_STACK
143
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150 static int sha1_compress(hash_state *md, unsigned char *buf)
0
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151 {
143
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152 int err;
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153 err = _sha1_compress(md, buf);
0
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154 burn_stack(sizeof(ulong32) * 87);
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155 return err;
0
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156 }
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157 #endif
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158
143
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159 int sha1_init(hash_state * md)
0
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160 {
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161 _ARGCHK(md != NULL);
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162 md->sha1.state[0] = 0x67452301UL;
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163 md->sha1.state[1] = 0xefcdab89UL;
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164 md->sha1.state[2] = 0x98badcfeUL;
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165 md->sha1.state[3] = 0x10325476UL;
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166 md->sha1.state[4] = 0xc3d2e1f0UL;
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167 md->sha1.curlen = 0;
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168 md->sha1.length = 0;
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169 return CRYPT_OK;
0
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170 }
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171
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172 HASH_PROCESS(sha1_process, sha1_compress, sha1, 64)
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173
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174 int sha1_done(hash_state * md, unsigned char *hash)
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175 {
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176 int i;
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177
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178 _ARGCHK(md != NULL);
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179 _ARGCHK(hash != NULL);
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180
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181 if (md->sha1.curlen >= sizeof(md->sha1.buf)) {
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182 return CRYPT_INVALID_ARG;
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183 }
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184
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185 /* increase the length of the message */
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186 md->sha1.length += md->sha1.curlen * 8;
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187
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188 /* append the '1' bit */
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189 md->sha1.buf[md->sha1.curlen++] = (unsigned char)0x80;
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190
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191 /* if the length is currently above 56 bytes we append zeros
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192 * then compress. Then we can fall back to padding zeros and length
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193 * encoding like normal.
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194 */
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195 if (md->sha1.curlen > 56) {
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196 while (md->sha1.curlen < 64) {
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197 md->sha1.buf[md->sha1.curlen++] = (unsigned char)0;
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198 }
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199 sha1_compress(md, md->sha1.buf);
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200 md->sha1.curlen = 0;
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201 }
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202
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203 /* pad upto 56 bytes of zeroes */
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204 while (md->sha1.curlen < 56) {
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205 md->sha1.buf[md->sha1.curlen++] = (unsigned char)0;
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206 }
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207
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208 /* store length */
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209 STORE64H(md->sha1.length, md->sha1.buf+56);
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210 sha1_compress(md, md->sha1.buf);
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211
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212 /* copy output */
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213 for (i = 0; i < 5; i++) {
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214 STORE32H(md->sha1.state[i], hash+(4*i));
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215 }
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216 #ifdef CLEAN_STACK
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217 zeromem(md, sizeof(hash_state));
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218 #endif
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219 return CRYPT_OK;
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220 }
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221
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222 int sha1_test(void)
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223 {
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224 #ifndef LTC_TEST
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225 return CRYPT_NOP;
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226 #else
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227 static const struct {
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228 char *msg;
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229 unsigned char hash[20];
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230 } tests[] = {
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231 { "abc",
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232 { 0xa9, 0x99, 0x3e, 0x36, 0x47, 0x06, 0x81, 0x6a,
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233 0xba, 0x3e, 0x25, 0x71, 0x78, 0x50, 0xc2, 0x6c,
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234 0x9c, 0xd0, 0xd8, 0x9d }
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235 },
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236 { "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq",
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237 { 0x84, 0x98, 0x3E, 0x44, 0x1C, 0x3B, 0xD2, 0x6E,
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238 0xBA, 0xAE, 0x4A, 0xA1, 0xF9, 0x51, 0x29, 0xE5,
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239 0xE5, 0x46, 0x70, 0xF1 }
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240 }
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241 };
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242
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243 int i;
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244 unsigned char tmp[20];
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245 hash_state md;
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246
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247 for (i = 0; i < (int)(sizeof(tests) / sizeof(tests[0])); i++) {
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248 sha1_init(&md);
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249 sha1_process(&md, (unsigned char*)tests[i].msg, (unsigned long)strlen(tests[i].msg));
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250 sha1_done(&md, tmp);
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251 if (memcmp(tmp, tests[i].hash, 20) != 0) {
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252 return CRYPT_FAIL_TESTVECTOR;
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253 }
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254 }
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255 return CRYPT_OK;
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256 #endif
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257 }
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258
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259 #endif
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260
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261