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annotate toys/lsb/md5sum.c @ 848:feea7a8ecbb1

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Redo find's indenting from tabs to two spaces.
author Rob Landley <rob@landley.net>
date Wed, 10 Apr 2013 19:58:21 -0500
parents 786841fdb1e0
children 5bdd2ee6f3c4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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, NULL, TOYFLAG_USR|TOYFLAG_BIN))
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12 USE_MD5SUM_SHA1SUM(OLDTOY(sha1sum, md5sum, NULL, 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 config MD5SUM_SHA1SUM
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25 bool "sha1sum"
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26 default y
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27 depends on MD5SUM
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28 help
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29 usage: sha1sum [FILE]...
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30
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31 calculate sha1 hash for each input file, reading from stdin if one.
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32 Output one hash (20 hex digits) for each input file, followed by
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33 filename.
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34 */
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35
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36 #define FOR_md5sum
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37 #include "toys.h"
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38
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39 GLOBALS(
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40 unsigned state[5];
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41 unsigned oldstate[5];
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42 uint64_t count;
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43 union {
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44 char c[64];
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45 unsigned i[16];
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46 } buffer;
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47 )
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48
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49 // for(i=0; i<64; i++) md5table[i] = abs(sin(i+1))*(1<<32); But calculating
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50 // that involves not just floating point but pulling in -lm (and arguing with
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51 // C about whether 1<<32 is a valid thing to do on 32 bit platforms) so:
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52
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53 static uint32_t md5table[64] = {
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54 0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, 0xf57c0faf, 0x4787c62a,
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55 0xa8304613, 0xfd469501, 0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
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56 0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821, 0xf61e2562, 0xc040b340,
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57 0x265e5a51, 0xe9b6c7aa, 0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8,
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58 0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed, 0xa9e3e905, 0xfcefa3f8,
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59 0x676f02d9, 0x8d2a4c8a, 0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c,
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60 0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70, 0x289b7ec6, 0xeaa127fa,
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61 0xd4ef3085, 0x04881d05, 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
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62 0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, 0x655b59c3, 0x8f0ccc92,
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63 0xffeff47d, 0x85845dd1, 0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
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64 0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391
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65 };
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66
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67 // Mix next 64 bytes of data into md5 hash
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68
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69 static void md5_transform(void)
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70 {
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71 unsigned x[4], *b = (unsigned *)TT.buffer.c;
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72 int i;
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73
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74 memcpy(x, TT.state, sizeof(x));
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75
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76 for (i=0; i<64; i++) {
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77 unsigned int in, a, rot, temp;
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78
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79 a = (-i)&3;
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80 if (i<16) {
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81 in = i;
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82 rot = 7+(5*(i&3));
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83 temp = x[(a+1)&3];
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84 temp = (temp & x[(a+2)&3]) | ((~temp) & x[(a+3)&3]);
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85 } else if (i<32) {
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86 in = (1+(5*i))&15;
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87 temp = (i&3)+1;
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88 rot = temp*5;
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89 if (temp&2) rot--;
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90 temp = x[(a+3)&3];
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91 temp = (x[(a+1)&3] & temp) | (x[(a+2)&3] & ~temp);
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92 } else if (i<48) {
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93 in = (5+(3*(i&15)))&15;
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94 rot = i&3;
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95 rot = 4+(5*rot)+((rot+1)&6);
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96 temp = x[(a+1)&3] ^ x[(a+2)&3] ^ x[(a+3)&3];
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97 } else {
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98 in = (7*(i&15))&15;
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99 rot = (i&3)+1;
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100 rot = (5*rot)+(((rot+2)&2)>>1);
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101 temp = x[(a+2)&3] ^ (x[(a+1)&3] | ~x[(a+3)&3]);
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102 }
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103 temp += x[a] + b[in] + md5table[i];
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104 x[a] = x[(a+1)&3] + ((temp<<rot) | (temp>>(32-rot)));
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105 }
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106 for (i=0; i<4; i++) TT.state[i] += x[i];
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107 }
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108
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109 // Mix next 64 bytes of data into sha1 hash.
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110
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111 static const unsigned rconsts[]={0x5A827999,0x6ED9EBA1,0x8F1BBCDC,0xCA62C1D6};
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112 #define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
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113
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114 static void sha1_transform(void)
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115 {
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116 int i, j, k, count;
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117 unsigned *block = TT.buffer.i;
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118 unsigned *rot[5], *temp;
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119
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120 // Copy context->state[] to working vars
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121 for (i=0; i<5; i++) {
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122 TT.oldstate[i] = TT.state[i];
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123 rot[i] = TT.state + i;
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124 }
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125 // 4 rounds of 20 operations each.
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126 for (i=count=0; i<4; i++) {
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127 for (j=0; j<20; j++) {
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128 unsigned work;
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129
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130 work = *rot[2] ^ *rot[3];
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131 if (!i) work = (work & *rot[1]) ^ *rot[3];
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132 else {
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133 if (i==2) work = ((*rot[1]|*rot[2])&*rot[3])|(*rot[1]&*rot[2]);
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134 else work ^= *rot[1];
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135 }
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136
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137 if (!i && j<16)
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138 work += block[count] = (rol(block[count],24)&0xFF00FF00)
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139 | (rol(block[count],8)&0x00FF00FF);
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140 else
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141 work += block[count&15] = rol(block[(count+13)&15]
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142 ^ block[(count+8)&15] ^ block[(count+2)&15] ^ block[count&15], 1);
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143 *rot[4] += work + rol(*rot[0],5) + rconsts[i];
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144 *rot[1] = rol(*rot[1],30);
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145
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146 // Rotate by one for next time.
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147 temp = rot[4];
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148 for (k=4; k; k--) rot[k] = rot[k-1];
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149 *rot = temp;
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150 count++;
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151 }
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152 }
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153 // Add the previous values of state[]
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154 for (i=0; i<5; i++) TT.state[i] += TT.oldstate[i];
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155 }
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156
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157 // Fill the 64-byte working buffer and call transform() when full.
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158
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159 static void hash_update(char *data, unsigned int len, void (*transform)(void))
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160 {
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161 unsigned int i, j;
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162
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163 j = TT.count & 63;
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164 TT.count += len;
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165
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166 // Enough data to process a frame?
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167 if ((j + len) > 63) {
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168 i = 64-j;
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169 memcpy(TT.buffer.c + j, data, i);
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170 transform();
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171 for ( ; i + 63 < len; i += 64) {
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172 memcpy(TT.buffer.c, data + i, 64);
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173 transform();
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174 }
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175 j = 0;
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176 } else i = 0;
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177 // Grab remaining chunk
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178 memcpy(TT.buffer.c + j, data + i, len - i);
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179 }
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180
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181 // Callback for loopfiles()
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182
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183 static void do_hash(int fd, char *name)
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184 {
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185 uint64_t count;
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186 int i, sha1=toys.which->name[0]=='s';;
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187 char buf;
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188 void (*transform)(void);
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189
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190 /* SHA1 initialization constants (md5sum uses first 4) */
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191 TT.state[0] = 0x67452301;
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192 TT.state[1] = 0xEFCDAB89;
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193 TT.state[2] = 0x98BADCFE;
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194 TT.state[3] = 0x10325476;
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195 TT.state[4] = 0xC3D2E1F0;
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196 TT.count = 0;
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197
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198 transform = sha1 ? sha1_transform : md5_transform;
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199 for (;;) {
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200 i = read(fd, toybuf, sizeof(toybuf));
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201 if (i<1) break;
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202 hash_update(toybuf, i, transform);
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203 }
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204
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205 count = TT.count << 3;
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206
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207 // End the message by appending a "1" bit to the data, ending with the
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208 // message size (in bits, big endian), and adding enough zero bits in
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209 // between to pad to the end of the next 64-byte frame.
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210 //
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211 // Since our input up to now has been in whole bytes, we can deal with
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212 // bytes here too.
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213
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214 buf = 0x80;
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215 do {
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216 hash_update(&buf, 1, transform);
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217 buf = 0;
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218 } while ((TT.count & 63) != 56);
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219 if (sha1) count=bswap_64(count);
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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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220 for (i = 0; i < 8; i++) TT.buffer.c[56+i] = count >> (8*i);
680
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221 transform();
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222
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223 if (sha1)
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224 for (i = 0; i < 20; i++)
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225 printf("%02x", 255&(TT.state[i>>2] >> ((3-(i & 3)) * 8)));
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226 else for (i=0; i<4; i++) printf("%08x", SWAP_BE32(TT.state[i]));
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227
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228 // Wipe variables. Cryptographer paranoia.
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229 memset(&TT, 0, sizeof(TT));
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230
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231 printf(" %s\n", name);
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232 }
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233
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234 void md5sum_main(void)
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235 {
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236 loopfiles(toys.optargs, do_hash);
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237 }