275 lines
8.8 KiB
C
275 lines
8.8 KiB
C
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/*
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MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
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Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991.
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All rights reserved.
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License to copy and use this software is granted provided that it
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is identified as the "RSA Data Security, Inc. MD5 Message-Digest
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Algorithm" in all material mentioning or referencing this software
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or this function.
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License is also granted to make and use derivative works provided
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that such works are identified as "derived from the RSA Data
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Security, Inc. MD5 Message-Digest Algorithm" in all material
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mentioning or referencing the derived work.
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RSA Data Security, Inc. makes no representations concerning either
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the merchantability of this software or the suitability of this
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software for any particular purpose. It is provided "as is"
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without express or implied warranty of any kind.
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These notices must be retained in any copies of any part of this
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documentation and/or software.
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*/
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#include "mupdf/fitz.h"
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#include <string.h>
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/* Constants for MD5Transform routine */
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enum
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{
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S11 = 7, S12 = 12, S13 = 17, S14 = 22,
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S21 = 5, S22 = 9, S23 = 14, S24 = 20,
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S31 = 4, S32 = 11, S33 = 16, S34 = 23,
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S41 = 6, S42 = 10, S43 = 15, S44 = 21
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};
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static void encode(unsigned char *, const unsigned int *, const unsigned);
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static void decode(unsigned int *, const unsigned char *, const unsigned);
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static void transform(unsigned int state[4], const unsigned char block[64]);
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static const unsigned char padding[64] =
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{
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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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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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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
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};
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/* F, G, H and I are basic MD5 functions */
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#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
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#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
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#define H(x, y, z) ((x) ^ (y) ^ (z))
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#define I(x, y, z) ((y) ^ ((x) | (~z)))
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/* ROTATE rotates x left n bits */
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#define ROTATE(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
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* Rotation is separate from addition to prevent recomputation.
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*/
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#define FF(a, b, c, d, x, s, ac) { \
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(a) += F ((b), (c), (d)) + (x) + (unsigned int)(ac); \
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(a) = ROTATE ((a), (s)); \
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(a) += (b); \
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}
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#define GG(a, b, c, d, x, s, ac) { \
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(a) += G ((b), (c), (d)) + (x) + (unsigned int)(ac); \
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(a) = ROTATE ((a), (s)); \
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(a) += (b); \
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}
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#define HH(a, b, c, d, x, s, ac) { \
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(a) += H ((b), (c), (d)) + (x) + (unsigned int)(ac); \
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(a) = ROTATE ((a), (s)); \
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(a) += (b); \
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}
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#define II(a, b, c, d, x, s, ac) { \
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(a) += I ((b), (c), (d)) + (x) + (unsigned int)(ac); \
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(a) = ROTATE ((a), (s)); \
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(a) += (b); \
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}
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static void encode(unsigned char *output, const unsigned int *input, const unsigned len)
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{
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unsigned i, j;
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for (i = 0, j = 0; j < len; i++, j += 4)
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{
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output[j] = (unsigned char)(input[i] & 0xff);
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output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
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output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
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output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
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}
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}
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static void decode(unsigned int *output, const unsigned char *input, const unsigned len)
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{
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unsigned i, j;
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for (i = 0, j = 0; j < len; i++, j += 4)
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{
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output[i] = ((unsigned int)input[j]) |
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(((unsigned int)input[j+1]) << 8) |
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(((unsigned int)input[j+2]) << 16) |
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(((unsigned int)input[j+3]) << 24);
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}
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}
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static void transform(unsigned int state[4], const unsigned char block[64])
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{
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unsigned int a = state[0];
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unsigned int b = state[1];
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unsigned int c = state[2];
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unsigned int d = state[3];
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unsigned int x[16];
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decode(x, block, 64);
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/* Round 1 */
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FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
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FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
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FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
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FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
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FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
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FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
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FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
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FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
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FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
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FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
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FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
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FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
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FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
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FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
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FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
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FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
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/* Round 2 */
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GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
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GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
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GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
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GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
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GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
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GG (d, a, b, c, x[10], S22, 0x02441453); /* 22 */
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GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
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GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
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GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
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GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
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GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
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GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
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GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
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GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
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GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
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GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
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/* Round 3 */
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HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
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HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
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HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
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HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
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HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
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HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
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HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
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HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
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HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
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HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
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HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
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HH (b, c, d, a, x[ 6], S34, 0x04881d05); /* 44 */
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HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
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HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
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HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
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HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
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/* Round 4 */
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II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
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II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
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II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
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II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
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II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
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II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
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II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
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II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
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II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
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II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
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II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
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II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
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II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
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II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
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II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
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II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
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state[0] += a;
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state[1] += b;
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state[2] += c;
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state[3] += d;
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/* Zeroize sensitive information */
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memset(x, 0, sizeof (x));
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}
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/* MD5 initialization. Begins an MD5 operation, writing a new context. */
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void fz_md5_init(fz_md5 *context)
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{
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context->count[0] = context->count[1] = 0;
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/* Load magic initialization constants */
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context->state[0] = 0x67452301;
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context->state[1] = 0xefcdab89;
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context->state[2] = 0x98badcfe;
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context->state[3] = 0x10325476;
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}
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/* MD5 block update operation. Continues an MD5 message-digest operation,
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* processing another message block, and updating the context.
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*/
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void fz_md5_update(fz_md5 *context, const unsigned char *input, size_t inlen)
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{
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size_t i, index, partlen;
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/* Compute number of bytes mod 64 */
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index = (size_t)((context->count[0] >> 3) & 0x3F);
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/* Update number of bits */
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context->count[0] += (unsigned int) inlen << 3;
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if (context->count[0] < (unsigned int) inlen << 3)
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context->count[1] ++;
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context->count[1] += (unsigned int) inlen >> 29;
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partlen = 64 - index;
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/* Transform as many times as possible. */
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if (inlen >= partlen)
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{
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memcpy(context->buffer + index, input, partlen);
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transform(context->state, context->buffer);
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for (i = partlen; i + 63 < inlen; i += 64)
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transform(context->state, input + i);
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index = 0;
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}
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else
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{
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i = 0;
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}
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/* Buffer remaining input */
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memcpy(context->buffer + index, input + i, inlen - i);
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}
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/* MD5 finalization. Ends an MD5 message-digest operation, writing the
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* the message digest and zeroizing the context.
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*/
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void fz_md5_final(fz_md5 *context, unsigned char digest[16])
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{
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unsigned char bits[8];
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unsigned index, padlen;
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/* Save number of bits */
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encode(bits, context->count, 8);
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/* Pad out to 56 mod 64 */
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index = (unsigned)((context->count[0] >> 3) & 0x3f);
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padlen = index < 56 ? 56 - index : 120 - index;
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fz_md5_update(context, padding, padlen);
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/* Append length (before padding) */
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fz_md5_update(context, bits, 8);
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/* Store state in digest */
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encode(digest, context->state, 16);
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/* Zeroize sensitive information */
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memset(context, 0, sizeof(fz_md5));
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}
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