annotate sha1.c @ 89:cecb105ff479 libtomcrypt

Fix for big-endian load/store macros
author Matt Johnston <matt@ucc.asn.au>
date Fri, 03 Sep 2004 08:31:12 +0000
parents 6362d3854bb4
children 5d99163f7e32
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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
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24 /* DER identifier */
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25 { 0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2B, 0x0E,
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26 0x03, 0x02, 0x1A, 0x05, 0x00, 0x04, 0x14 },
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27 15,
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28
3
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29 &sha1_init,
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30 &sha1_process,
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31 &sha1_done,
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32 &sha1_test
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33 };
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34
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35 #define F0(x,y,z) (z ^ (x & (y ^ z)))
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36 #define F1(x,y,z) (x ^ y ^ z)
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37 #define F2(x,y,z) ((x & y) | (z & (x | y)))
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38 #define F3(x,y,z) (x ^ y ^ z)
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39
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40 #ifdef CLEAN_STACK
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41 static void _sha1_compress(hash_state *md, unsigned char *buf)
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42 #else
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43 static void sha1_compress(hash_state *md, unsigned char *buf)
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44 #endif
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45 {
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46 ulong32 a,b,c,d,e,W[80],i;
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47 #ifdef SMALL_CODE
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48 ulong32 t;
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49 #endif
3
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50
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51 /* copy the state into 512-bits into W[0..15] */
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52 for (i = 0; i < 16; i++) {
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53 LOAD32H(W[i], buf + (4*i));
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54 }
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55
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56 /* copy state */
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57 a = md->sha1.state[0];
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58 b = md->sha1.state[1];
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59 c = md->sha1.state[2];
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60 d = md->sha1.state[3];
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61 e = md->sha1.state[4];
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62
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63 /* expand it */
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64 for (i = 16; i < 80; i++) {
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65 W[i] = ROL(W[i-3] ^ W[i-8] ^ W[i-14] ^ W[i-16], 1);
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66 }
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67
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68 /* compress */
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69 /* round one */
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70 #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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71 #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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72 #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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73 #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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74
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75 #ifdef SMALL_CODE
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76
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77 for (i = 0; i < 20; ) {
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78 FF0(a,b,c,d,e,i++); t = e; e = d; d = c; c = b; b = a; a = t;
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79 }
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80
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81 for (; i < 40; ) {
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82 FF1(a,b,c,d,e,i++); t = e; e = d; d = c; c = b; b = a; a = t;
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83 }
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84
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85 for (; i < 60; ) {
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86 FF2(a,b,c,d,e,i++); t = e; e = d; d = c; c = b; b = a; a = t;
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87 }
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88
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89 for (; i < 80; ) {
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90 FF3(a,b,c,d,e,i++); t = e; e = d; d = c; c = b; b = a; a = t;
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91 }
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92
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93 #else
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94
3
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95 for (i = 0; i < 20; ) {
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96 FF0(a,b,c,d,e,i++);
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97 FF0(e,a,b,c,d,i++);
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98 FF0(d,e,a,b,c,i++);
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99 FF0(c,d,e,a,b,i++);
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100 FF0(b,c,d,e,a,i++);
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101 }
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102
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103 /* round two */
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104 for (; i < 40; ) {
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105 FF1(a,b,c,d,e,i++);
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106 FF1(e,a,b,c,d,i++);
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107 FF1(d,e,a,b,c,i++);
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108 FF1(c,d,e,a,b,i++);
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109 FF1(b,c,d,e,a,i++);
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110 }
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111
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112 /* round three */
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113 for (; i < 60; ) {
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114 FF2(a,b,c,d,e,i++);
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115 FF2(e,a,b,c,d,i++);
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116 FF2(d,e,a,b,c,i++);
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117 FF2(c,d,e,a,b,i++);
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118 FF2(b,c,d,e,a,i++);
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119 }
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120
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121 /* round four */
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122 for (; i < 80; ) {
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123 FF3(a,b,c,d,e,i++);
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124 FF3(e,a,b,c,d,i++);
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125 FF3(d,e,a,b,c,i++);
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126 FF3(c,d,e,a,b,i++);
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127 FF3(b,c,d,e,a,i++);
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128 }
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129 #endif
3
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130
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131 #undef FF0
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132 #undef FF1
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133 #undef FF2
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134 #undef FF3
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135
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136 /* store */
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137 md->sha1.state[0] = md->sha1.state[0] + a;
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138 md->sha1.state[1] = md->sha1.state[1] + b;
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139 md->sha1.state[2] = md->sha1.state[2] + c;
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140 md->sha1.state[3] = md->sha1.state[3] + d;
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141 md->sha1.state[4] = md->sha1.state[4] + e;
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142 }
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143
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144 #ifdef CLEAN_STACK
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145 static void sha1_compress(hash_state *md, unsigned char *buf)
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146 {
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147 _sha1_compress(md, buf);
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148 burn_stack(sizeof(ulong32) * 87);
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149 }
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150 #endif
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151
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152 void sha1_init(hash_state * md)
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153 {
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154 _ARGCHK(md != NULL);
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155 md->sha1.state[0] = 0x67452301UL;
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156 md->sha1.state[1] = 0xefcdab89UL;
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157 md->sha1.state[2] = 0x98badcfeUL;
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158 md->sha1.state[3] = 0x10325476UL;
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159 md->sha1.state[4] = 0xc3d2e1f0UL;
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160 md->sha1.curlen = 0;
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161 md->sha1.length = 0;
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162 }
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163
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164 HASH_PROCESS(sha1_process, sha1_compress, sha1, 64)
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165
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166 int sha1_done(hash_state * md, unsigned char *hash)
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167 {
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168 int i;
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169
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170 _ARGCHK(md != NULL);
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171 _ARGCHK(hash != NULL);
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172
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173 if (md->sha1.curlen >= sizeof(md->sha1.buf)) {
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174 return CRYPT_INVALID_ARG;
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175 }
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176
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177 /* increase the length of the message */
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178 md->sha1.length += md->sha1.curlen * 8;
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179
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180 /* append the '1' bit */
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181 md->sha1.buf[md->sha1.curlen++] = (unsigned char)0x80;
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182
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183 /* if the length is currently above 56 bytes we append zeros
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184 * then compress. Then we can fall back to padding zeros and length
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185 * encoding like normal.
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186 */
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187 if (md->sha1.curlen > 56) {
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188 while (md->sha1.curlen < 64) {
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189 md->sha1.buf[md->sha1.curlen++] = (unsigned char)0;
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190 }
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191 sha1_compress(md, md->sha1.buf);
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192 md->sha1.curlen = 0;
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193 }
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194
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195 /* pad upto 56 bytes of zeroes */
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196 while (md->sha1.curlen < 56) {
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197 md->sha1.buf[md->sha1.curlen++] = (unsigned char)0;
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198 }
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199
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200 /* store length */
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201 STORE64H(md->sha1.length, md->sha1.buf+56);
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202 sha1_compress(md, md->sha1.buf);
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203
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204 /* copy output */
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205 for (i = 0; i < 5; i++) {
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206 STORE32H(md->sha1.state[i], hash+(4*i));
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207 }
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208 #ifdef CLEAN_STACK
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209 zeromem(md, sizeof(hash_state));
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210 #endif
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211 return CRYPT_OK;
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212 }
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213
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214 int sha1_test(void)
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215 {
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216 #ifndef LTC_TEST
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217 return CRYPT_NOP;
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218 #else
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219 static const struct {
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220 char *msg;
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221 unsigned char hash[20];
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222 } tests[] = {
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223 { "abc",
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224 { 0xa9, 0x99, 0x3e, 0x36, 0x47, 0x06, 0x81, 0x6a,
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225 0xba, 0x3e, 0x25, 0x71, 0x78, 0x50, 0xc2, 0x6c,
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226 0x9c, 0xd0, 0xd8, 0x9d }
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227 },
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228 { "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq",
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229 { 0x84, 0x98, 0x3E, 0x44, 0x1C, 0x3B, 0xD2, 0x6E,
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230 0xBA, 0xAE, 0x4A, 0xA1, 0xF9, 0x51, 0x29, 0xE5,
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231 0xE5, 0x46, 0x70, 0xF1 }
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232 }
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233 };
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234
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235 int i;
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236 unsigned char tmp[20];
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237 hash_state md;
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238
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239 for (i = 0; i < (int)(sizeof(tests) / sizeof(tests[0])); i++) {
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240 sha1_init(&md);
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241 sha1_process(&md, (unsigned char*)tests[i].msg, (unsigned long)strlen(tests[i].msg));
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242 sha1_done(&md, tmp);
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243 if (memcmp(tmp, tests[i].hash, 20) != 0) {
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244 return CRYPT_FAIL_TESTVECTOR;
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245 }
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246 }
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247 return CRYPT_OK;
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248 #endif
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249 }
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250
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251 #endif
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252
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253