annotate src/xs_md5.c @ 657:acaba070cf49

Lots of cosmetic code cleanups; synced the de-gettextification from Audacious-SID, I suppose it makes some sense ...
author Matti Hamalainen <ccr@tnsp.org>
date Wed, 02 Apr 2008 19:46:59 +0300
parents a3fdd2d6c056
children b0743dc9165d
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1 /*
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2 * MD5 implementation, modified for XMMS-SID from
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3 * Colin Plumb's implementation by Matti 'ccr' Hämäläinen.
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4 *
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5 * This code implements the MD5 message-digest algorithm.
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6 * The algorithm is due to Ron Rivest. This code was
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7 * written by Colin Plumb in 1993, no copyright is claimed.
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8 * This code is in the public domain; do with it what you wish.
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9 */
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10 #include "xs_support.h"
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11 #include "xs_md5.h"
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12 #include <glib.h>
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14
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15 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
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16 #define xs_md5_bytereverse(buf, len) /* Nothing */
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17 #else
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18 #if G_BYTE_ORDER == G_BIG_ENDIAN
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19 static void xs_md5_bytereverse(guint8 *buf, guint l)
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20 {
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21 guint32 t;
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22 do {
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23 t = (guint32) ((guint) buf[3] << 8 | buf[2]) << 16 | ((guint) buf[1] << 8 | buf[0]);
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24 *(guint32 *) buf = t;
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25 buf += sizeof(guint32);
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26 } while (--l);
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27 }
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28 #else
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29 #error Unsupported endianess!
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30 #endif
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31 #endif
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32
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33
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34 /* Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
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35 * initialization constants.
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36 */
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37 void xs_md5_init(xs_md5state_t *ctx)
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38 {
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39 ctx->buf[0] = 0x67452301;
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40 ctx->buf[1] = 0xefcdab89;
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41 ctx->buf[2] = 0x98badcfe;
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42 ctx->buf[3] = 0x10325476;
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43
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44 ctx->bits[0] = 0;
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45 ctx->bits[1] = 0;
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46 }
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47
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48
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49 /* The core of the MD5 algorithm, this alters an existing MD5 hash to
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50 * reflect the addition of 16 longwords of new data. xs_md5_update blocks
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51 * the data and converts bytes into longwords for this routine.
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52 */
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53 #define F1(x, y, z) (z ^ (x & (y ^ z)))
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54 #define F2(x, y, z) F1(z, x, y)
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55 #define F3(x, y, z) (x ^ y ^ z)
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56 #define F4(x, y, z) (y ^ (x | ~z))
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57 #define MD5STEP(f, w, x, y, z, data, s) \
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58 ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
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59
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60 static void xs_md5_transform(guint32 buf[4], guint32 const in[16])
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61 {
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62 register guint32 a, b, c, d;
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63
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64 a = buf[0];
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65 b = buf[1];
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66 c = buf[2];
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67 d = buf[3];
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68
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69 MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
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70 MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
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71 MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
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72 MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
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73 MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
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74 MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
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75 MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
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76 MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
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77 MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
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78 MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
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79 MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
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80 MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
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81 MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
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82 MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
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83 MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
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84 MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
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85
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86 MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
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87 MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
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88 MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
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89 MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
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90 MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
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91 MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
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92 MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
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93 MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
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94 MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
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95 MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
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96 MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
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97 MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
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98 MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
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99 MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
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100 MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
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101 MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
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102
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103 MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
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104 MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
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105 MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
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106 MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
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107 MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
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108 MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
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109 MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
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110 MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
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111 MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
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112 MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
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113 MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
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114 MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
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115 MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
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116 MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
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117 MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
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118 MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
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119
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120 MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
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121 MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
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122 MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
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123 MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
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124 MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
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125 MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
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126 MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
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127 MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
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128 MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
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129 MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
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130 MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
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131 MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
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132 MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
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133 MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
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134 MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
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135 MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
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136
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137 buf[0] += a;
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138 buf[1] += b;
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139 buf[2] += c;
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140 buf[3] += d;
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141 }
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142
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143
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144 /* Update context to reflect the concatenation of another buffer full
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145 * of bytes.
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146 */
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147 void xs_md5_append(xs_md5state_t *ctx, const guint8 *buf, guint len)
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148 {
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149 guint32 t;
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150
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151 /* Update bitcount */
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152 t = ctx->bits[0];
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153 if ((ctx->bits[0] = t + ((guint32) len << 3)) < t)
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154 ctx->bits[1]++; /* Carry from low to high */
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155 ctx->bits[1] += len >> 29;
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156
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157 t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */
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158
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159 /* Handle any leading odd-sized chunks */
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160 if (t) {
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161 guint8 *p = (guint8 *) ctx->in + t;
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162
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163 t = 64 - t;
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164 if (len < t) {
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165 memcpy(p, buf, len);
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166 return;
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167 }
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168 memcpy(p, buf, t);
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169 xs_md5_bytereverse(ctx->in, 16);
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170 xs_md5_transform(ctx->buf, (guint32 *) ctx->in);
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171 buf += t;
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172 len -= t;
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173 }
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174
491
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175 /* Process data in 64-byte chunks */
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176 while (len >= 64) {
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177 memcpy(ctx->in, buf, 64);
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178 xs_md5_bytereverse(ctx->in, 16);
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179 xs_md5_transform(ctx->buf, (guint32 *) ctx->in);
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180 buf += 64;
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181 len -= 64;
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182 }
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183
491
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184 /* Handle any remaining bytes of data. */
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185 memcpy(ctx->in, buf, len);
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186 }
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187
491
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188 /* Final wrapup - pad to 64-byte boundary with the bit pattern
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189 * 1 0* (64-bit count of bits processed, MSB-first)
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190 */
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191 void xs_md5_finish(xs_md5state_t *ctx, xs_md5hash_t digest)
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192 {
491
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193 guint count;
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194 guint8 *p;
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195
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196 /* Compute number of bytes mod 64 */
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197 count = (ctx->bits[0] >> 3) & 0x3F;
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198
491
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199 /* Set the first char of padding to 0x80. This is safe since there is
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200 always at least one byte free */
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201 p = ctx->in + count;
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202 *p++ = 0x80;
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203
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204 /* Bytes of padding needed to make 64 bytes */
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205 count = 64 - 1 - count;
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206
491
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207 /* Pad out to 56 mod 64 */
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208 if (count < 8) {
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209 /* Two lots of padding: Pad the first block to 64 bytes */
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210 memset(p, 0, count);
491
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211 xs_md5_bytereverse(ctx->in, 16);
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212 xs_md5_transform(ctx->buf, (guint32 *) ctx->in);
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213
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214 /* Now fill the next block with 56 bytes */
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215 memset(ctx->in, 0, 56);
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216 } else {
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217 /* Pad block to 56 bytes */
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218 memset(p, 0, count - 8);
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219 }
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220 xs_md5_bytereverse(ctx->in, 14);
359
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diff changeset
221
491
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222 /* Append length in bits and transform */
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223 ((guint32 *) ctx->in)[14] = ctx->bits[0];
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224 ((guint32 *) ctx->in)[15] = ctx->bits[1];
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225
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226 xs_md5_transform(ctx->buf, (guint32 *) ctx->in);
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227 xs_md5_bytereverse((guint8 *) ctx->buf, 4);
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228 memcpy(digest, ctx->buf, 16);
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229 memset(ctx, 0, sizeof(ctx)); /* In case it's sensitive */
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230 }