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Build an intermediary fmgen.a archive.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Mon, 08 Sep 2014 17:44:53 +0200
parents c55ea9478c80
children
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c55ea9478c80 Hello Gensokyo!
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1 /*! \file
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2 * This code implements the MD5 message-digest algorithm.
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3 * The algorithm is due to Ron Rivest. This code was
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4 * written by Colin Plumb in 1993, no copyright is claimed.
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5 * This code is in the public domain; do with it what you wish.
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6 *
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7 * Equivalent code is available from RSA Data Security, Inc.
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8 * This code has been tested against that, and is equivalent,
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9 * except that you don't need to include two pages of legalese
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10 * with every copy.
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11 *
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12 * To compute the message digest of a chunk of bytes, declare an
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13 * MD5Context structure, pass it to MD5Init, call MD5Update as
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14 * needed on buffers full of bytes, and then call MD5Final, which
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15 * will fill a supplied 16-byte array with the digest.
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16 */
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17 #include <stdint.h>
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18 #include <string.h>
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19
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20 typedef struct {
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21 uint32_t buf[4];
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22 uint32_t bytes[2];
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23 uint32_t in[16];
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24 } MD5_CTX;
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25 #define ROTATE(a,n) ({ register unsigned int ret; \
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26 __asm__ volatile("roll %%cl,%0" \
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27 : "=r"(ret) \
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28 : "c"(n), "0"((unsigned int)(a)) \
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29 : "cc"); ret; })
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30
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31 /*!
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32 * Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
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33 * initialization constants.
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34 */
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35 void
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36 MD5Init(MD5_CTX *ctx) {
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37 ctx->buf[0] = 0x67452301;
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38 ctx->buf[1] = 0xefcdab89;
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39 ctx->buf[2] = 0x98badcfe;
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40 ctx->buf[3] = 0x10325476;
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41
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42 ctx->bytes[0] = 0;
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43 ctx->bytes[1] = 0;
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44 }
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45
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46 /*@{*/
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47 /*! The four core functions - F1 is optimized somewhat */
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48
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49 /* #define F1(x, y, z) (x & y | ~x & z) */
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50 #define F1(x, y, z) (z ^ (x & (y ^ z)))
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51 #define F2(x, y, z) F1(z, x, y)
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52 #define F3(x, y, z) (x ^ y ^ z)
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53 #define F4(x, y, z) (y ^ (x | ~z))
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54 /*@}*/
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55
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56 /*! This is the central step in the MD5 algorithm. */
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57 #define MD5STEP(f,w,x,y,z,in,s) \
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58 (w += f(x,y,z) + in, w = (w<<s | w>>(32-s)) + x)
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59
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60 /*!
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61 * The core of the MD5 algorithm, this alters an existing MD5 hash to
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62 * reflect the addition of 16 longwords of new data. MD5Update blocks
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63 * the data and converts bytes into longwords for this routine.
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64 */
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65 static void
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66 transform(uint32_t buf[4], uint32_t const in[16]) {
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67 register uint32_t a, b, c, d;
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68
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69 a = buf[0];
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70 b = buf[1];
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71 c = buf[2];
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72 d = buf[3];
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73
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74 MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
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75 MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
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76 MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
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77 MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
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78 MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
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79 MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
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80 MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
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81 MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
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82 MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
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83 MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
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84 MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
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85 MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
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86 MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
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87 MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
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88 MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
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89 MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
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90
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91 MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
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92 MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
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93 MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
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94 MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
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95 MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
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96 MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
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97 MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
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98 MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
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99 MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
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100 MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
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101 MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
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102 MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
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103 MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
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104 MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
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105 MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
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106 MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
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107
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108 MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
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109 MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
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110 MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
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111 MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
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112 MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
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113 MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
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114 MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
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115 MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
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116 MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
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117 MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
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118 MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
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119 MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
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120 MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
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121 MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
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122 MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
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123 MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
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124
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125 MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
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126 MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
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127 MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
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128 MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
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129 MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
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130 MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
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131 MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
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132 MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
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133 MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
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134 MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
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135 MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
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136 MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
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137 MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
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138 MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
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diff changeset
139 MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
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diff changeset
140 MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
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141
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142 buf[0] += a;
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143 buf[1] += b;
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diff changeset
144 buf[2] += c;
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diff changeset
145 buf[3] += d;
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diff changeset
146 }
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diff changeset
147
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diff changeset
148 /*!
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diff changeset
149 * Update context to reflect the concatenation of another buffer full
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diff changeset
150 * of bytes.
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151 */
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152 void
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153 MD5Update(MD5_CTX *ctx, const unsigned char *buf, unsigned int len) {
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diff changeset
154 uint32_t t;
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155
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156 /* Update byte count */
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diff changeset
157
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158 t = ctx->bytes[0];
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diff changeset
159 if ((ctx->bytes[0] = t + len) < t)
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diff changeset
160 ctx->bytes[1]++; /* Carry from low to high */
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diff changeset
161
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162 t = 64 - (t & 0x3f); /* Space available in ctx->in (at least 1) */
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diff changeset
163 if (t > len) {
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164 memcpy((unsigned char *)ctx->in + 64 - t, buf, len);
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diff changeset
165 return;
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parents:
diff changeset
166 }
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diff changeset
167 /* First chunk is an odd size */
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diff changeset
168 memcpy((unsigned char *)ctx->in + 64 - t, buf, t);
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diff changeset
169 transform(ctx->buf, ctx->in);
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diff changeset
170 buf += t;
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diff changeset
171 len -= t;
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diff changeset
172
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diff changeset
173 /* Process data in 64-byte chunks */
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diff changeset
174 while (len >= 64) {
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diff changeset
175 memcpy(ctx->in, buf, 64);
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diff changeset
176 transform(ctx->buf, ctx->in);
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diff changeset
177 buf += 64;
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diff changeset
178 len -= 64;
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diff changeset
179 }
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diff changeset
180
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parents:
diff changeset
181 /* Handle any remaining bytes of data. */
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diff changeset
182 memcpy(ctx->in, buf, len);
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diff changeset
183 }
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diff changeset
184
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diff changeset
185 static inline void small_memset(void *addr, int c, size_t size) {
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186 __asm__ volatile("xor %%al, %%al \t\n"
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187 "rep; stosb \t\n"
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188 :"+D"(addr) :"c"(size) :"%al");
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189 }
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diff changeset
190
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parents:
diff changeset
191 /*!
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parents:
diff changeset
192 * Final wrapup - pad to 64-byte boundary with the bit pattern
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diff changeset
193 * 1 0* (64-bit count of bits processed, MSB-first)
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diff changeset
194 */
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diff changeset
195 void
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diff changeset
196 MD5Final(MD5_CTX *ctx, unsigned char *digest) {
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197 int count = ctx->bytes[0] & 0x3f; /* Number of bytes in ctx->in */
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198 unsigned char *p = (unsigned char *)ctx->in + count;
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diff changeset
199
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diff changeset
200 /* Set the first char of padding to 0x80. There is always room. */
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diff changeset
201 *p++ = 0x80;
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diff changeset
202
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diff changeset
203 /* Bytes of padding needed to make 56 bytes (-8..55) */
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diff changeset
204 count = 56 - 1 - count;
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diff changeset
205
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diff changeset
206 if (count < 0) { /* Padding forces an extra block */
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diff changeset
207 small_memset(p, 0, count + 8);
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diff changeset
208 transform(ctx->buf, ctx->in);
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diff changeset
209 p = (unsigned char *)ctx->in;
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diff changeset
210 count = 56;
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diff changeset
211 }
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diff changeset
212 small_memset(p, 0, count);
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diff changeset
213
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parents:
diff changeset
214 /* Append length in bits and transform */
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diff changeset
215 ctx->in[14] = ctx->bytes[0] << 3;
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diff changeset
216 ctx->in[15] = ctx->bytes[1] << 3 | ctx->bytes[0] >> 29;
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diff changeset
217 transform(ctx->buf, ctx->in);
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diff changeset
218 memcpy(digest, ctx->buf, 16);
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diff changeset
219 }
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diff changeset
220
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diff changeset
221 typedef struct {
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diff changeset
222 unsigned int state[64];
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diff changeset
223 unsigned int index;
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parents:
diff changeset
224 } AVLFG;
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diff changeset
225 static AVLFG c;
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diff changeset
226
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diff changeset
227 void lfg_srand(unsigned int seed){
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diff changeset
228 uint32_t i, tmp[4]={0};
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diff changeset
229 MD5_CTX ctx;
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diff changeset
230
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diff changeset
231 for(i=0; i<64; i+=4){
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diff changeset
232 tmp[0]=seed; tmp[3]=i;
c55ea9478c80 Hello Gensokyo!
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diff changeset
233 MD5Init(&ctx);
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diff changeset
234 MD5Update(&ctx, (uint8_t*)tmp, 16);
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diff changeset
235 MD5Final(&ctx, (uint8_t*)tmp);
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diff changeset
236 c.state[i ]= tmp[0];
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diff changeset
237 c.state[i+1]= tmp[1];
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diff changeset
238 c.state[i+2]= tmp[2];
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diff changeset
239 c.state[i+3]= tmp[3];
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parents:
diff changeset
240 }
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parents:
diff changeset
241 c.index=0;
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parents:
diff changeset
242 }
c55ea9478c80 Hello Gensokyo!
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parents:
diff changeset
243
c55ea9478c80 Hello Gensokyo!
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parents:
diff changeset
244 /**
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parents:
diff changeset
245 * Get the next random unsigned 32-bit number using an ALFG.
c55ea9478c80 Hello Gensokyo!
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parents:
diff changeset
246 */
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parents:
diff changeset
247 unsigned int lfg_rand(void){
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diff changeset
248 c.state[c.index & 63] = c.state[(c.index-24) & 63] + c.state[(c.index-55) & 63];
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diff changeset
249 return c.state[c.index++ & 63];
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parents:
diff changeset
250 }
c55ea9478c80 Hello Gensokyo!
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diff changeset
251
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parents:
diff changeset
252 #ifdef TEST
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parents:
diff changeset
253 #include <stdio.h>
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diff changeset
254 void av_md5_sum(uint8_t *dst, const uint8_t *src, const int len)
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parents:
diff changeset
255 {
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parents:
diff changeset
256 MD5_CTX ctx;
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parents:
diff changeset
257
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diff changeset
258 MD5Init(&ctx);
c55ea9478c80 Hello Gensokyo!
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diff changeset
259 MD5Update(&ctx, src, len);
c55ea9478c80 Hello Gensokyo!
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diff changeset
260 MD5Final(&ctx, dst);
c55ea9478c80 Hello Gensokyo!
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parents:
diff changeset
261 }
c55ea9478c80 Hello Gensokyo!
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parents:
diff changeset
262
c55ea9478c80 Hello Gensokyo!
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diff changeset
263 static void print_md5(uint8_t *md5)
c55ea9478c80 Hello Gensokyo!
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parents:
diff changeset
264 {
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parents:
diff changeset
265 int i;
c55ea9478c80 Hello Gensokyo!
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parents:
diff changeset
266 for (i = 0; i < 16; i++)
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parents:
diff changeset
267 printf("%02x", md5[i]);
c55ea9478c80 Hello Gensokyo!
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parents:
diff changeset
268 printf("\n");
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parents:
diff changeset
269 }
c55ea9478c80 Hello Gensokyo!
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parents:
diff changeset
270
c55ea9478c80 Hello Gensokyo!
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diff changeset
271 int main(void){
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diff changeset
272 uint8_t md5val[16];
c55ea9478c80 Hello Gensokyo!
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parents:
diff changeset
273 int i;
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274 uint8_t in[1000];
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275
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276 for (i = 0; i < 1000; i++)
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277 in[i] = i * i;
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278 av_md5_sum(md5val, in, 1000); print_md5(md5val);
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279 av_md5_sum(md5val, in, 63); print_md5(md5val);
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280 av_md5_sum(md5val, in, 64); print_md5(md5val);
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281 av_md5_sum(md5val, in, 65); print_md5(md5val);
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282 for (i = 0; i < 1000; i++)
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283 in[i] = i % 127;
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284 av_md5_sum(md5val, in, 999); print_md5(md5val);
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285
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286 return 0;
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287 }
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288 #endif
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289