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| 4680 | right-hear | 1 | /* |
| 2 | MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm |
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| 3 | |||
| 4 | Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. |
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| 5 | All rights reserved. |
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| 6 | |||
| 7 | License to copy and use this software is granted provided that it |
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| 8 | is identified as the "RSA Data Security, Inc. MD5 Message-Digest |
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| 9 | Algorithm" in all material mentioning or referencing this software |
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| 10 | or this function. |
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| 11 | |||
| 12 | License is also granted to make and use derivative works provided |
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| 13 | that such works are identified as "derived from the RSA Data |
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| 14 | Security, Inc. MD5 Message-Digest Algorithm" in all material |
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| 15 | mentioning or referencing the derived work. |
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| 16 | |||
| 17 | RSA Data Security, Inc. makes no representations concerning either |
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| 18 | the merchantability of this software or the suitability of this |
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| 19 | software for any particular purpose. It is provided "as is" |
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| 20 | without express or implied warranty of any kind. |
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| 21 | |||
| 22 | These notices must be retained in any copies of any part of this |
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| 23 | documentation and/or software. |
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| 24 | */ |
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| 25 | |||
| 26 | #include "fitz.h" |
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| 27 | |||
| 28 | /* Constants for MD5Transform routine */ |
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| 29 | enum |
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| 30 | { |
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| 31 | S11 = 7, S12 = 12, S13 = 17, S14 = 22, |
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| 32 | S21 = 5, S22 = 9, S23 = 14, S24 = 20, |
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| 33 | S31 = 4, S32 = 11, S33 = 16, S34 = 23, |
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| 34 | S41 = 6, S42 = 10, S43 = 15, S44 = 21 |
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| 35 | }; |
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| 36 | |||
| 37 | static void encode(unsigned char *, const unsigned int *, const unsigned); |
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| 38 | static void decode(unsigned int *, const unsigned char *, const unsigned); |
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| 39 | static void transform(unsigned int state[4], const unsigned char block[64]); |
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| 40 | |||
| 41 | static unsigned char padding[64] = |
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| 42 | { |
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| 43 | 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
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| 44 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
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| 45 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 |
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| 46 | }; |
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| 47 | |||
| 48 | /* F, G, H and I are basic MD5 functions */ |
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| 49 | #define F(x, y, z) (((x) & (y)) | ((~x) & (z))) |
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| 50 | #define G(x, y, z) (((x) & (z)) | ((y) & (~z))) |
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| 51 | #define H(x, y, z) ((x) ^ (y) ^ (z)) |
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| 52 | #define I(x, y, z) ((y) ^ ((x) | (~z))) |
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| 53 | |||
| 54 | /* ROTATE rotates x left n bits */ |
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| 55 | #define ROTATE(x, n) (((x) << (n)) | ((x) >> (32-(n)))) |
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| 56 | |||
| 57 | /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4. |
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| 58 | * Rotation is separate from addition to prevent recomputation. |
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| 59 | */ |
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| 60 | #define FF(a, b, c, d, x, s, ac) { \ |
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| 61 | (a) += F ((b), (c), (d)) + (x) + (unsigned int)(ac); \ |
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| 62 | (a) = ROTATE ((a), (s)); \ |
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| 63 | (a) += (b); \ |
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| 64 | } |
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| 65 | #define GG(a, b, c, d, x, s, ac) { \ |
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| 66 | (a) += G ((b), (c), (d)) + (x) + (unsigned int)(ac); \ |
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| 67 | (a) = ROTATE ((a), (s)); \ |
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| 68 | (a) += (b); \ |
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| 69 | } |
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| 70 | #define HH(a, b, c, d, x, s, ac) { \ |
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| 71 | (a) += H ((b), (c), (d)) + (x) + (unsigned int)(ac); \ |
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| 72 | (a) = ROTATE ((a), (s)); \ |
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| 73 | (a) += (b); \ |
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| 74 | } |
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| 75 | #define II(a, b, c, d, x, s, ac) { \ |
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| 76 | (a) += I ((b), (c), (d)) + (x) + (unsigned int)(ac); \ |
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| 77 | (a) = ROTATE ((a), (s)); \ |
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| 78 | (a) += (b); \ |
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| 79 | } |
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| 80 | |||
| 81 | static void encode(unsigned char *output, const unsigned int *input, const unsigned len) |
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| 82 | { |
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| 83 | unsigned i, j; |
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| 84 | |||
| 85 | for (i = 0, j = 0; j < len; i++, j += 4) |
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| 86 | { |
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| 87 | output[j] = (unsigned char)(input[i] & 0xff); |
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| 88 | output[j+1] = (unsigned char)((input[i] >> 8) & 0xff); |
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| 89 | output[j+2] = (unsigned char)((input[i] >> 16) & 0xff); |
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| 90 | output[j+3] = (unsigned char)((input[i] >> 24) & 0xff); |
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| 91 | } |
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| 92 | } |
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| 93 | |||
| 94 | static void decode(unsigned int *output, const unsigned char *input, const unsigned len) |
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| 95 | { |
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| 96 | unsigned i, j; |
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| 97 | |||
| 98 | for (i = 0, j = 0; j < len; i++, j += 4) |
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| 99 | { |
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| 100 | output[i] = ((unsigned int)input[j]) | |
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| 101 | (((unsigned int)input[j+1]) << 8) | |
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| 102 | (((unsigned int)input[j+2]) << 16) | |
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| 103 | (((unsigned int)input[j+3]) << 24); |
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| 104 | } |
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| 105 | } |
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| 106 | |||
| 107 | static void transform(unsigned int state[4], const unsigned char block[64]) |
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| 108 | { |
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| 109 | unsigned int a = state[0]; |
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| 110 | unsigned int b = state[1]; |
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| 111 | unsigned int c = state[2]; |
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| 112 | unsigned int d = state[3]; |
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| 113 | unsigned int x[16]; |
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| 114 | |||
| 115 | decode(x, block, 64); |
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| 116 | |||
| 117 | /* Round 1 */ |
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| 118 | FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */ |
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| 119 | FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */ |
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| 120 | FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */ |
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| 121 | FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */ |
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| 122 | FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */ |
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| 123 | FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */ |
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| 124 | FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */ |
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| 125 | FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */ |
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| 126 | FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */ |
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| 127 | FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */ |
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| 128 | FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */ |
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| 129 | FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */ |
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| 130 | FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */ |
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| 131 | FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */ |
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| 132 | FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */ |
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| 133 | FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */ |
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| 134 | |||
| 135 | /* Round 2 */ |
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| 136 | GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */ |
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| 137 | GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */ |
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| 138 | GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */ |
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| 139 | GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */ |
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| 140 | GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */ |
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| 141 | GG (d, a, b, c, x[10], S22, 0x02441453); /* 22 */ |
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| 142 | GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */ |
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| 143 | GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */ |
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| 144 | GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */ |
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| 145 | GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */ |
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| 146 | GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */ |
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| 147 | GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */ |
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| 148 | GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */ |
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| 149 | GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */ |
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| 150 | GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */ |
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| 151 | GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */ |
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| 152 | |||
| 153 | /* Round 3 */ |
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| 154 | HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */ |
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| 155 | HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */ |
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| 156 | HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */ |
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| 157 | HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */ |
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| 158 | HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */ |
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| 159 | HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */ |
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| 160 | HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */ |
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| 161 | HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */ |
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| 162 | HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */ |
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| 163 | HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */ |
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| 164 | HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */ |
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| 165 | HH (b, c, d, a, x[ 6], S34, 0x04881d05); /* 44 */ |
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| 166 | HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */ |
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| 167 | HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */ |
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| 168 | HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */ |
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| 169 | HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */ |
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| 170 | |||
| 171 | /* Round 4 */ |
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| 172 | II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */ |
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| 173 | II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */ |
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| 174 | II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */ |
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| 175 | II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */ |
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| 176 | II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */ |
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| 177 | II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */ |
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| 178 | II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */ |
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| 179 | II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */ |
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| 180 | II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */ |
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| 181 | II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */ |
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| 182 | II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */ |
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| 183 | II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */ |
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| 184 | II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */ |
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| 185 | II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */ |
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| 186 | II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */ |
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| 187 | II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */ |
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| 188 | |||
| 189 | state[0] += a; |
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| 190 | state[1] += b; |
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| 191 | state[2] += c; |
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| 192 | state[3] += d; |
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| 193 | |||
| 194 | /* Zeroize sensitive information */ |
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| 195 | memset(x, 0, sizeof (x)); |
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| 196 | } |
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| 197 | |||
| 198 | /* MD5 initialization. Begins an MD5 operation, writing a new context. */ |
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| 199 | void fz_md5_init(fz_md5 *context) |
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| 200 | { |
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| 201 | context->count[0] = context->count[1] = 0; |
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| 202 | |||
| 203 | /* Load magic initialization constants */ |
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| 204 | context->state[0] = 0x67452301; |
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| 205 | context->state[1] = 0xefcdab89; |
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| 206 | context->state[2] = 0x98badcfe; |
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| 207 | context->state[3] = 0x10325476; |
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| 208 | } |
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| 209 | |||
| 210 | /* MD5 block update operation. Continues an MD5 message-digest operation, |
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| 211 | * processing another message block, and updating the context. |
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| 212 | */ |
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| 213 | void fz_md5_update(fz_md5 *context, const unsigned char *input, const unsigned inlen) |
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| 214 | { |
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| 215 | unsigned i, index, partlen; |
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| 216 | |||
| 217 | /* Compute number of bytes mod 64 */ |
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| 218 | index = (unsigned)((context->count[0] >> 3) & 0x3F); |
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| 219 | |||
| 220 | /* Update number of bits */ |
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| 221 | context->count[0] += (unsigned int) inlen << 3; |
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| 222 | if (context->count[0] < (unsigned int) inlen << 3) |
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| 223 | context->count[1] ++; |
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| 224 | context->count[1] += (unsigned int) inlen >> 29; |
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| 225 | |||
| 226 | partlen = 64 - index; |
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| 227 | |||
| 228 | /* Transform as many times as possible. */ |
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| 229 | if (inlen >= partlen) |
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| 230 | { |
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| 231 | memcpy(context->buffer + index, input, partlen); |
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| 232 | transform(context->state, context->buffer); |
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| 233 | |||
| 234 | for (i = partlen; i + 63 < inlen; i += 64) |
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| 235 | transform(context->state, input + i); |
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| 236 | |||
| 237 | index = 0; |
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| 238 | } |
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| 239 | else |
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| 240 | { |
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| 241 | i = 0; |
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| 242 | } |
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| 243 | |||
| 244 | /* Buffer remaining input */ |
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| 245 | memcpy(context->buffer + index, input + i, inlen - i); |
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| 246 | } |
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| 247 | |||
| 248 | /* MD5 finalization. Ends an MD5 message-digest operation, writing the |
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| 249 | * the message digest and zeroizing the context. |
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| 250 | */ |
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| 251 | void fz_md5_final(fz_md5 *context, unsigned char digest[16]) |
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| 252 | { |
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| 253 | unsigned char bits[8]; |
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| 254 | unsigned index, padlen; |
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| 255 | |||
| 256 | /* Save number of bits */ |
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| 257 | encode(bits, context->count, 8); |
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| 258 | |||
| 259 | /* Pad out to 56 mod 64 */ |
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| 260 | index = (unsigned)((context->count[0] >> 3) & 0x3f); |
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| 261 | padlen = index < 56 ? 56 - index : 120 - index; |
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| 262 | fz_md5_update(context, padding, padlen); |
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| 263 | |||
| 264 | /* Append length (before padding) */ |
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| 265 | fz_md5_update(context, bits, 8); |
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| 266 | |||
| 267 | /* Store state in digest */ |
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| 268 | encode(digest, context->state, 16); |
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| 269 | |||
| 270 | /* Zeroize sensitive information */ |
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| 271 | memset(context, 0, sizeof(fz_md5)); |
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| 272 | } |