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annotate toys/lsb/md5sum.c @ 1566:62a7d617e1ce draft 0.5.1

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Make md5sum and sha1sum work on big endian systems.
author Rob Landley <rob@landley.net>
date Wed, 19 Nov 2014 21:38:00 -0600
parents 319e79bab052
children
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786841fdb1e0 Reindent to two spaces per level. Remove vi: directives that haven't worked right in years (ubuntu broke its' vim implementation). Remove trailing spaces. Add/remove blank lines. Re-wordwrap in places. Update documentation with new coding style.
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1 /* md5sum.c - Calculate RFC 1321 md5 hash and sha1 hash.
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2 *
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3 * Copyright 2012 Rob Landley <rob@landley.net>
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4 *
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5 * See http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/md5sum.html
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6 * and http://www.ietf.org/rfc/rfc1321.txt
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7 *
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8 * They're combined this way to share infrastructure, and because md5sum is
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9 * and LSB standard command, sha1sum is just a good idea.
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10
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11 USE_MD5SUM(NEWTOY(md5sum, "b", TOYFLAG_USR|TOYFLAG_BIN))
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12 USE_SHA1SUM(NEWTOY(sha1sum, "b", TOYFLAG_USR|TOYFLAG_BIN))
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13
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14 config MD5SUM
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15 bool "md5sum"
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16 default y
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17 help
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18 usage: md5sum [FILE]...
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19
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20 Calculate md5 hash for each input file, reading from stdin if none.
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21 Output one hash (16 hex digits) for each input file, followed by
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22 filename.
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23
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24 -b brief (hash only, no filename)
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25
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26 config SHA1SUM
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27 bool "sha1sum"
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28 default y
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29 help
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30 usage: sha1sum [FILE]...
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31
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32 calculate sha1 hash for each input file, reading from stdin if none.
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33 Output one hash (20 hex digits) for each input file, followed by
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34 filename.
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35
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36 -b brief (hash only, no filename)
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37 */
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38
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39 #define FOR_md5sum
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40 #include "toys.h"
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41
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42 GLOBALS(
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43 unsigned state[5];
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44 unsigned oldstate[5];
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45 uint64_t count;
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46 union {
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47 char c[64];
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48 unsigned i[16];
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49 } buffer;
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50 )
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51
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52 #define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
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53
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54 // for(i=0; i<64; i++) md5table[i] = abs(sin(i+1))*(1<<32); But calculating
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55 // that involves not just floating point but pulling in -lm (and arguing with
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56 // C about whether 1<<32 is a valid thing to do on 32 bit platforms) so:
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57
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58 static uint32_t md5table[64] = {
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59 0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, 0xf57c0faf, 0x4787c62a,
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60 0xa8304613, 0xfd469501, 0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
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61 0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821, 0xf61e2562, 0xc040b340,
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62 0x265e5a51, 0xe9b6c7aa, 0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8,
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63 0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed, 0xa9e3e905, 0xfcefa3f8,
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64 0x676f02d9, 0x8d2a4c8a, 0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c,
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65 0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70, 0x289b7ec6, 0xeaa127fa,
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66 0xd4ef3085, 0x04881d05, 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
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67 0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, 0x655b59c3, 0x8f0ccc92,
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68 0xffeff47d, 0x85845dd1, 0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
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69 0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391
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70 };
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71
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72 static const uint8_t md5rot[64] = {
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73 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22,
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74 5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20,
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75 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23,
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76 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21
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77 };
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78
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79 // Mix next 64 bytes of data into md5 hash
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80
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81 static void md5_transform(void)
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82 {
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83 unsigned x[4], *b = TT.buffer.i;
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84 int i;
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85
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86 memcpy(x, TT.state, sizeof(x));
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87
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88 for (i=0; i<64; i++) {
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89 unsigned int in, temp, swap;
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90 if (i<16) {
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91 in = i;
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92 temp = x[1];
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93 temp = (temp & x[2]) | ((~temp) & x[3]);
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94 } else if (i<32) {
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95 in = (1+(5*i))&15;
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96 temp = x[3];
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97 temp = (x[1] & temp) | (x[2] & ~temp);
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98 } else if (i<48) {
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99 in = (3*i+5)&15;
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100 temp = x[1] ^ x[2] ^ x[3];
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101 } else {
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102 in = (7*i)&15;
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103 temp = x[2] ^ (x[1] | ~x[3]);
680
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104 }
1286
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105 temp += x[0] + b[in] + md5table[i];
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106 swap = x[3];
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107 x[3] = x[2];
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108 x[2] = x[1];
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109 x[1] += rol(temp, md5rot[i]);
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110 x[0] = swap;
680
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111 }
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112 for (i=0; i<4; i++) TT.state[i] += x[i];
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113 }
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114
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115 // Mix next 64 bytes of data into sha1 hash.
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116
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117 static const unsigned rconsts[]={0x5A827999,0x6ED9EBA1,0x8F1BBCDC,0xCA62C1D6};
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118
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119 static void sha1_transform(void)
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120 {
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121 int i, j, k, count;
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122 unsigned *block = TT.buffer.i;
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123 unsigned *rot[5], *temp;
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124
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125 // Copy context->state[] to working vars
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126 for (i=0; i<5; i++) {
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127 TT.oldstate[i] = TT.state[i];
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128 rot[i] = TT.state + i;
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129 }
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130 // 4 rounds of 20 operations each.
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131 for (i=count=0; i<4; i++) {
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132 for (j=0; j<20; j++) {
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133 unsigned work;
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134
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135 work = *rot[2] ^ *rot[3];
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136 if (!i) work = (work & *rot[1]) ^ *rot[3];
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137 else {
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138 if (i==2) work = ((*rot[1]|*rot[2])&*rot[3])|(*rot[1]&*rot[2]);
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139 else work ^= *rot[1];
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140 }
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141
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142 if (!i && j<16)
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143 work += block[count] = (rol(block[count],24)&0xFF00FF00)
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144 | (rol(block[count],8)&0x00FF00FF);
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145 else
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146 work += block[count&15] = rol(block[(count+13)&15]
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147 ^ block[(count+8)&15] ^ block[(count+2)&15] ^ block[count&15], 1);
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148 *rot[4] += work + rol(*rot[0],5) + rconsts[i];
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149 *rot[1] = rol(*rot[1],30);
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150
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151 // Rotate by one for next time.
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152 temp = rot[4];
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153 for (k=4; k; k--) rot[k] = rot[k-1];
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154 *rot = temp;
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155 count++;
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156 }
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157 }
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158 // Add the previous values of state[]
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159 for (i=0; i<5; i++) TT.state[i] += TT.oldstate[i];
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160 }
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161
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162 // Fill the 64-byte working buffer and call transform() when full.
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163
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164 static void hash_update(char *data, unsigned int len, void (*transform)(void))
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165 {
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166 unsigned int i, j;
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167
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168 j = TT.count & 63;
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169 TT.count += len;
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170
1566
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171 for (;;) {
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172 // Grab next chunk of data, return if it's not enough to process a frame
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173 i = 64 - j;
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174 if (i>len) i = len;
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175 memcpy(TT.buffer.c+j, data, i);
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176 if (j+i != 64) break;
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177
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178 // Process a frame
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179 if (IS_BIG_ENDIAN)
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180 for (j=0; j<16; j++) TT.buffer.i[j] = SWAP_LE32(TT.buffer.i[j]);
680
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181 transform();
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182 j=0;
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183 data += i;
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184 len -= i;
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185 }
680
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186 }
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187
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188 // Callback for loopfiles()
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189
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190 static void do_hash(int fd, char *name)
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191 {
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192 uint64_t count;
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193 int i, sha1=toys.which->name[0]=='s';;
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194 char buf;
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195 void (*transform)(void);
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196
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197 /* SHA1 initialization constants (md5sum uses first 4) */
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198 TT.state[0] = 0x67452301;
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199 TT.state[1] = 0xEFCDAB89;
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200 TT.state[2] = 0x98BADCFE;
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201 TT.state[3] = 0x10325476;
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202 TT.state[4] = 0xC3D2E1F0;
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203 TT.count = 0;
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204
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205 transform = sha1 ? sha1_transform : md5_transform;
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206 for (;;) {
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207 i = read(fd, toybuf, sizeof(toybuf));
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208 if (i<1) break;
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209 hash_update(toybuf, i, transform);
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210 }
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211
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212 count = TT.count << 3;
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213
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214 // End the message by appending a "1" bit to the data, ending with the
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215 // message size (in bits, big endian), and adding enough zero bits in
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216 // between to pad to the end of the next 64-byte frame.
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217 //
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218 // Since our input up to now has been in whole bytes, we can deal with
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219 // bytes here too.
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220
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221 buf = 0x80;
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222 do {
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223 hash_update(&buf, 1, transform);
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224 buf = 0;
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225 } while ((TT.count & 63) != 56);
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226 count = sha1 ? SWAP_BE64(count) : SWAP_LE64(count);
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227 hash_update((void *)&count, 8, transform);
680
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228
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229 if (sha1)
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230 for (i = 0; i < 20; i++)
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231 printf("%02x", 255&(TT.state[i>>2] >> ((3-(i & 3)) * 8)));
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232 else for (i=0; i<4; i++) printf("%08x", bswap_32(TT.state[i]));
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233
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234 // Wipe variables. Cryptographer paranoia.
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235 memset(&TT, 0, sizeof(TT));
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236
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237 printf((toys.optflags & FLAG_b) ? "\n" : " %s\n", name);
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238 }
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239
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240 void md5sum_main(void)
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241 {
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242 loopfiles(toys.optargs, do_hash);
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243 }
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244
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245 void sha1sum_main(void)
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246 {
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247 md5sum_main();
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248 }