annotate sha1.c @ 0:8705acff2494

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author Matt Johnston <matt@ucc.asn.au>
date Sat, 01 Jun 2013 01:38:42 +0800
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1 /* sha1.c */
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2 /*
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3 This file is part of the AVR-Crypto-Lib.
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4 Copyright (C) 2008, 2009 Daniel Otte ([email protected])
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5
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6 This program is free software: you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation, either version 3 of the License, or
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9 (at your option) any later version.
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10
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11 This program is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with this program. If not, see <http://www.gnu.org/licenses/>.
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18 */
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19 /**
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20 * \file sha1.c
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21 * \author Daniel Otte
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22 * \date 2006-10-08
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23 * \license GPLv3 or later
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24 * \brief SHA-1 implementation.
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25 *
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26 */
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27
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28 #include <string.h> /* memcpy & co */
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29 #include <stdint.h>
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30 #include "config.h"
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31 #include "debug.h"
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32 #include "sha1.h"
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33
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34 #ifdef DEBUG
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35 # undef DEBUG
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36 #endif
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37
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38 #include "cli.h"
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39
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40 #define LITTLE_ENDIAN
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41
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42 /********************************************************************************************************/
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43
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44 /**
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45 * \brief initialises given SHA-1 context
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46 *
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47 */
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48 void sha1_init(sha1_ctx_t *state){
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49 DEBUG_S("\r\nSHA1_INIT");
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50 state->h[0] = 0x67452301;
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51 state->h[1] = 0xefcdab89;
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52 state->h[2] = 0x98badcfe;
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53 state->h[3] = 0x10325476;
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54 state->h[4] = 0xc3d2e1f0;
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55 state->length = 0;
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56 }
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57
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58 /********************************************************************************************************/
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59 /* some helping functions */
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60 uint32_t rotl32(uint32_t n, uint8_t bits){
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61 return ((n<<bits) | (n>>(32-bits)));
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62 }
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63
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64 uint32_t change_endian32(uint32_t x){
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65 return (((x)<<24) | ((x)>>24) | (((x)& 0x0000ff00)<<8) | (((x)& 0x00ff0000)>>8));
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66 }
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67
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68
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69 /* three SHA-1 inner functions */
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70 uint32_t ch(uint32_t x, uint32_t y, uint32_t z){
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71 DEBUG_S("\r\nCH");
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72 return ((x&y)^((~x)&z));
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73 }
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74
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75 uint32_t maj(uint32_t x, uint32_t y, uint32_t z){
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76 DEBUG_S("\r\nMAJ");
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77 return ((x&y)^(x&z)^(y&z));
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78 }
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79
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80 uint32_t parity(uint32_t x, uint32_t y, uint32_t z){
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81 DEBUG_S("\r\nPARITY");
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82 return ((x^y)^z);
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83 }
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84
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85 /********************************************************************************************************/
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86 /**
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87 * \brief "add" a block to the hash
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88 * This is the core function of the hash algorithm. To understand how it's working
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89 * and what thoese variables do, take a look at FIPS-182. This is an "alternativ" implementation
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90 */
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91
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92 #define MASK 0x0000000f
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93
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94 typedef uint32_t (*pf_t)(uint32_t x, uint32_t y, uint32_t z);
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95
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96 void sha1_nextBlock (sha1_ctx_t *state, const void* block){
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97 uint32_t a[5];
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98 uint32_t w[16];
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99 uint32_t temp;
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100 uint8_t t,s,fi, fib;
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101 pf_t f[] = {ch,parity,maj,parity};
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102 uint32_t k[4]={ 0x5a827999,
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103 0x6ed9eba1,
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104 0x8f1bbcdc,
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105 0xca62c1d6};
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106
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107 /* load the w array (changing the endian and so) */
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108 for(t=0; t<16; ++t){
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109 w[t] = change_endian32(((uint32_t*)block)[t]);
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110 }
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111
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112 #if DEBUG
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113 uint8_t dbgi;
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114 for(dbgi=0; dbgi<16; ++dbgi){
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115 /*
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116 DEBUG_S("\n\rBlock:");
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117 DEBUG_B(dbgi);
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118 DEBUG_C(':');
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119 */
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120 cli_putstr_P(PSTR("\r\nBlock:"));
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121 cli_hexdump(&dbgi, 1);
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122 cli_putc(':');
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123 cli_hexdump(&(w[dbgi]) ,4);
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124 }
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125 #endif
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126
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127 /* load the state */
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128 memcpy(a, state->h, 5*sizeof(uint32_t));
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129
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130
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131 /* the fun stuff */
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132 for(fi=0,fib=0,t=0; t<=79; ++t){
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133 s = t & MASK;
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134 if(t>=16){
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135 #if DEBUG
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136 DEBUG_S("\r\n ws = "); cli_hexdump(&(w[s]), 4);
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137 #endif
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138 w[s] = rotl32( w[(s+13)&MASK] ^ w[(s+8)&MASK] ^
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139 w[(s+ 2)&MASK] ^ w[s] ,1);
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140 #ifdef DEBUG
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141 DEBUG_S(" --> ws = "); cli_hexdump(&(w[s]), 4);
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142 #endif
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143 }
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144
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145 uint32_t dtemp;
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146 temp = rotl32(a[0],5) + (dtemp=f[fi](a[1],a[2],a[3])) + a[4] + k[fi] + w[s];
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147 memmove(&(a[1]), &(a[0]), 4*sizeof(uint32_t)); /* e=d; d=c; c=b; b=a; */
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148 a[0] = temp;
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149 a[2] = rotl32(a[2],30); /* we might also do rotr32(c,2) */
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150 fib++;
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151 if(fib==20){
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152 fib=0;
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153 fi = (fi+1)%4;
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154 }
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155 #if DEBUG
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156 /* debug dump */
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157 DEBUG_S("\r\nt = "); DEBUG_B(t);
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158 DEBUG_S("; a[]: ");
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159 cli_hexdump(a, 5*4);
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160 DEBUG_S("; k = ");
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161 cli_hexdump(&(k[t/20]), 4);
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162 DEBUG_S("; f(b,c,d) = ");
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163 cli_hexdump(&dtemp, 4);
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164 #endif
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165 }
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166
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167 /* update the state */
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168 for(t=0; t<5; ++t){
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169 state->h[t] += a[t];
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170 }
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171 state->length += 512;
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172 }
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173
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174 /********************************************************************************************************/
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175
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176 void sha1_lastBlock(sha1_ctx_t *state, const void* block, uint16_t length){
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177 uint8_t lb[SHA1_BLOCK_BYTES]; /* local block */
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178 while(length>=SHA1_BLOCK_BITS){
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179 sha1_nextBlock(state, block);
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180 length -= SHA1_BLOCK_BITS;
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181 block = (uint8_t*)block + SHA1_BLOCK_BYTES;
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182 }
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183 state->length += length;
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184 memset(lb, 0, SHA1_BLOCK_BYTES);
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185 memcpy (lb, block, (length+7)>>3);
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186
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187 /* set the final one bit */
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188 lb[length>>3] |= 0x80>>(length & 0x07);
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189
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190 if (length>512-64-1){ /* not enouth space for 64bit length value */
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191 sha1_nextBlock(state, lb);
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192 state->length -= 512;
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193 memset(lb, 0, SHA1_BLOCK_BYTES);
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194 }
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195 /* store the 64bit length value */
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196 #if defined LITTLE_ENDIAN
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197 /* this is now rolled up */
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198 uint8_t i;
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199 for (i=0; i<8; ++i){
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200 lb[56+i] = ((uint8_t*)&(state->length))[7-i];
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201 }
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202 #elif defined BIG_ENDIAN
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203 *((uint64_t)&(lb[56])) = state->length;
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204 #endif
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205 sha1_nextBlock(state, lb);
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206 }
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207
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208 /********************************************************************************************************/
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209
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210 void sha1_ctx2hash (void *dest, sha1_ctx_t *state){
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211 #if defined LITTLE_ENDIAN
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212 uint8_t i;
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213 for(i=0; i<5; ++i){
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214 ((uint32_t*)dest)[i] = change_endian32(state->h[i]);
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215 }
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216 #elif BIG_ENDIAN
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217 if (dest != state->h)
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218 memcpy(dest, state->h, SHA1_HASH_BITS/8);
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219 #else
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220 # error unsupported endian type!
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221 #endif
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222 }
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223
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224 /********************************************************************************************************/
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225 /**
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226 *
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227 *
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228 */
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229 void sha1 (void *dest, const void* msg, uint32_t length){
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230 sha1_ctx_t s;
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231 DEBUG_S("\r\nBLA BLUB");
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232 sha1_init(&s);
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233 while(length & (~0x0001ff)){ /* length>=512 */
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234 DEBUG_S("\r\none block");
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235 sha1_nextBlock(&s, msg);
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236 msg = (uint8_t*)msg + SHA1_BLOCK_BITS/8; /* increment pointer to next block */
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237 length -= SHA1_BLOCK_BITS;
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238 }
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239 sha1_lastBlock(&s, msg, length);
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240 sha1_ctx2hash(dest, &s);
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241 }
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242
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243