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Diffstat (limited to 'libmd5/md5.c')
| -rw-r--r-- | libmd5/md5.c | 793 |
1 files changed, 290 insertions, 503 deletions
diff --git a/libmd5/md5.c b/libmd5/md5.c index a667090..d75105c 100644 --- a/libmd5/md5.c +++ b/libmd5/md5.c @@ -1,517 +1,202 @@ -/* - * Functions to compute MD5 message digest of files or memory blocks - * according to the definition of MD5 in RFC 1321 from April 1992. - * Copyright (C) 1995, 1996 Free Software Foundation, Inc. NOTE: The - * canonical source of this file is maintained with the GNU C Library. - * Bugs can be reported to bug-glibc@prep.ai.mit.edu. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published - * by the Free Software Foundation; either version 2, or (at your - * option) any later version. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA - * 02111-1307, USA. - * - * Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995. - * Modified by Gray Watson <http://256.com/gray/>, 1997. - * - * $Id$ +/* MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm */ -/* - * NOTE: during quick performance tests on a Sun Sparc Ultra 1 and an - * Alpha 255 300, these functions performed upwards of 3mb/sec - * including disk I/O time. +/* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All + rights reserved. + + License to copy and use this software is granted provided that it + is identified as the "RSA Data Security, Inc. MD5 Message-Digest + Algorithm" in all material mentioning or referencing this software + or this function. + + License is also granted to make and use derivative works provided + that such works are identified as "derived from the RSA Data + Security, Inc. MD5 Message-Digest Algorithm" in all material + mentioning or referencing the derived work. + + RSA Data Security, Inc. makes no representations concerning either + the merchantability of this software or the suitability of this + software for any particular purpose. It is provided "as is" + without express or implied warranty of any kind. + + These notices must be retained in any copies of any part of this + documentation and/or software. */ -/* - * MD5 Test Suite from RFC1321: http://ds.internic.net:/rfc/rfc1321.txt - * - * MD5 ("") = d41d8cd98f00b204e9800998ecf8427e - * MD5 ("a") = 0cc175b9c0f1b6a831c399e269772661 - * MD5 ("abc") = 900150983cd24fb0d6963f7d28e17f72 - * MD5 ("message digest") = f96b697d7cb7938d525a2f31aaf161d0 - * MD5 ("abcdefghijklmnopqrstuvwxyz") = c3fcd3d76192e4007dfb496cca67e13b - * MD5 ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789") = - * d174ab98d277d9f5a5611c2c9f419d9f - * MD5 ("123456789012345678901234567890123456789012345678901234567890123456 - * 78901234567890") = 57edf4a22be3c955ac49da2e2107b67a - */ +#include "md5_loc.h" +#include "md5.h" -#include <stdlib.h> -#include <string.h> -#include <sys/types.h> +/* Constants for MD5Transform routine. + */ +#define S11 7 +#define S12 12 +#define S13 17 +#define S14 22 +#define S21 5 +#define S22 9 +#define S23 14 +#define S24 20 +#define S31 4 +#define S32 11 +#define S33 16 +#define S34 23 +#define S41 6 +#define S42 10 +#define S43 15 +#define S44 21 + +static void MD5Transform (UINT4 [4], const unsigned char [64]); +static void Encode(unsigned char *, UINT4 *, unsigned int); +static void Decode (UINT4 *, const unsigned char *, unsigned int); +static void MD5_memcpy (POINTER, POINTER, unsigned int); +static void MD5_memset (POINTER, int, unsigned int); + +static unsigned char PADDING[64] = { + 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 +}; + +/* F, G, H and I are basic MD5 functions. + */ +#define F(x, y, z) (((x) & (y)) | ((~x) & (z))) +#define G(x, y, z) (((x) & (z)) | ((y) & (~z))) +#define H(x, y, z) ((x) ^ (y) ^ (z)) +#define I(x, y, z) ((y) ^ ((x) | (~z))) -#include "md5.h" -#include "md5_loc.h" +/* ROTATE_LEFT rotates x left n bits. + */ +#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) -#if LIB_VERSION_REQUIRED -static char *rcs_id = - "$Id$"; - -/* version id for the library */ -static char *version_id = "$MD5Version: 1.0.0 November-19-1997 $"; -#endif - -/****************************** local routines *******************************/ - -/* - * process_block - * - * DESCRIPTION: - * - * Process a block of bytes into a MD5 state structure. - * - * RETURNS: - * - * None. - * - * ARGUMENTS: - * - * md5_p - Pointer to MD5 structure from which we are getting the result. - * - * buffer - A buffer of bytes whose MD5 signature we are calculating. - * - * buf_len - The length of the buffer. +/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4. + Rotation is separate from addition to prevent recomputation. */ -static void process_block(md5_t *md5_p, const void *buffer, - const unsigned int buf_len) -{ - md5_uint32 correct[16]; - const void *buf_p = buffer, *end_p; - unsigned int words_n; - md5_uint32 A, B, C, D; - - words_n = buf_len / sizeof(md5_uint32); - end_p = (char *)buf_p + words_n * sizeof(md5_uint32); - - A = md5_p->md_A; - B = md5_p->md_B; - C = md5_p->md_C; - D = md5_p->md_D; - - /* - * First increment the byte count. RFC 1321 specifies the possible - * length of the file up to 2^64 bits. Here we only compute the - * number of bytes with a double word increment. Modified to do - * this to better avoid overflows in the lower word -- Gray 10/97. - */ - if (md5_p->md_total[0] > MAX_MD5_UINT32 - buf_len) { - md5_p->md_total[1]++; - md5_p->md_total[0] -= (MAX_MD5_UINT32 - buf_len); +#define FF(a, b, c, d, x, s, ac) { \ + (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \ + (a) = ROTATE_LEFT ((a), (s)); \ + (a) += (b); \ } - else { - md5_p->md_total[0] += buf_len; +#define GG(a, b, c, d, x, s, ac) { \ + (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \ + (a) = ROTATE_LEFT ((a), (s)); \ + (a) += (b); \ } - - /* - * Process all bytes in the buffer with MD5_BLOCK bytes in each - * round of the loop. - */ - while (buf_p < end_p) { - md5_uint32 A_save, B_save, C_save, D_save; - md5_uint32 *corr_p = correct; - - A_save = A; - B_save = B; - C_save = C; - D_save = D; - - /* - * Before we start, one word to the strange constants. They are - * defined in RFC 1321 as - * - * T[i] = (int) (4294967296.0 * fabs (sin (i))), i=1..MD5_BLOCK - */ - - /* Round 1. */ - OP1 (A, B, C, D, buf_p, corr_p, 7, 0xd76aa478); - OP1 (D, A, B, C, buf_p, corr_p, 12, 0xe8c7b756); - OP1 (C, D, A, B, buf_p, corr_p, 17, 0x242070db); - OP1 (B, C, D, A, buf_p, corr_p, 22, 0xc1bdceee); - OP1 (A, B, C, D, buf_p, corr_p, 7, 0xf57c0faf); - OP1 (D, A, B, C, buf_p, corr_p, 12, 0x4787c62a); - OP1 (C, D, A, B, buf_p, corr_p, 17, 0xa8304613); - OP1 (B, C, D, A, buf_p, corr_p, 22, 0xfd469501); - OP1 (A, B, C, D, buf_p, corr_p, 7, 0x698098d8); - OP1 (D, A, B, C, buf_p, corr_p, 12, 0x8b44f7af); - OP1 (C, D, A, B, buf_p, corr_p, 17, 0xffff5bb1); - OP1 (B, C, D, A, buf_p, corr_p, 22, 0x895cd7be); - OP1 (A, B, C, D, buf_p, corr_p, 7, 0x6b901122); - OP1 (D, A, B, C, buf_p, corr_p, 12, 0xfd987193); - OP1 (C, D, A, B, buf_p, corr_p, 17, 0xa679438e); - OP1 (B, C, D, A, buf_p, corr_p, 22, 0x49b40821); - - /* Round 2. */ - OP234 (FG, A, B, C, D, correct[ 1], 5, 0xf61e2562); - OP234 (FG, D, A, B, C, correct[ 6], 9, 0xc040b340); - OP234 (FG, C, D, A, B, correct[ 11], 14, 0x265e5a51); - OP234 (FG, B, C, D, A, correct[ 0], 20, 0xe9b6c7aa); - OP234 (FG, A, B, C, D, correct[ 5], 5, 0xd62f105d); - OP234 (FG, D, A, B, C, correct[ 10], 9, 0x02441453); - OP234 (FG, C, D, A, B, correct[ 15], 14, 0xd8a1e681); - OP234 (FG, B, C, D, A, correct[ 4], 20, 0xe7d3fbc8); - OP234 (FG, A, B, C, D, correct[ 9], 5, 0x21e1cde6); - OP234 (FG, D, A, B, C, correct[ 14], 9, 0xc33707d6); - OP234 (FG, C, D, A, B, correct[ 3], 14, 0xf4d50d87); - OP234 (FG, B, C, D, A, correct[ 8], 20, 0x455a14ed); - OP234 (FG, A, B, C, D, correct[ 13], 5, 0xa9e3e905); - OP234 (FG, D, A, B, C, correct[ 2], 9, 0xfcefa3f8); - OP234 (FG, C, D, A, B, correct[ 7], 14, 0x676f02d9); - OP234 (FG, B, C, D, A, correct[ 12], 20, 0x8d2a4c8a); - - /* Round 3. */ - OP234 (FH, A, B, C, D, correct[ 5], 4, 0xfffa3942); - OP234 (FH, D, A, B, C, correct[ 8], 11, 0x8771f681); - OP234 (FH, C, D, A, B, correct[ 11], 16, 0x6d9d6122); - OP234 (FH, B, C, D, A, correct[ 14], 23, 0xfde5380c); - OP234 (FH, A, B, C, D, correct[ 1], 4, 0xa4beea44); - OP234 (FH, D, A, B, C, correct[ 4], 11, 0x4bdecfa9); - OP234 (FH, C, D, A, B, correct[ 7], 16, 0xf6bb4b60); - OP234 (FH, B, C, D, A, correct[ 10], 23, 0xbebfbc70); - OP234 (FH, A, B, C, D, correct[ 13], 4, 0x289b7ec6); - OP234 (FH, D, A, B, C, correct[ 0], 11, 0xeaa127fa); - OP234 (FH, C, D, A, B, correct[ 3], 16, 0xd4ef3085); - OP234 (FH, B, C, D, A, correct[ 6], 23, 0x04881d05); - OP234 (FH, A, B, C, D, correct[ 9], 4, 0xd9d4d039); - OP234 (FH, D, A, B, C, correct[ 12], 11, 0xe6db99e5); - OP234 (FH, C, D, A, B, correct[ 15], 16, 0x1fa27cf8); - OP234 (FH, B, C, D, A, correct[ 2], 23, 0xc4ac5665); - - /* Round 4. */ - OP234 (FI, A, B, C, D, correct[ 0], 6, 0xf4292244); - OP234 (FI, D, A, B, C, correct[ 7], 10, 0x432aff97); - OP234 (FI, C, D, A, B, correct[ 14], 15, 0xab9423a7); - OP234 (FI, B, C, D, A, correct[ 5], 21, 0xfc93a039); - OP234 (FI, A, B, C, D, correct[ 12], 6, 0x655b59c3); - OP234 (FI, D, A, B, C, correct[ 3], 10, 0x8f0ccc92); - OP234 (FI, C, D, A, B, correct[ 10], 15, 0xffeff47d); - OP234 (FI, B, C, D, A, correct[ 1], 21, 0x85845dd1); - OP234 (FI, A, B, C, D, correct[ 8], 6, 0x6fa87e4f); - OP234 (FI, D, A, B, C, correct[ 15], 10, 0xfe2ce6e0); - OP234 (FI, C, D, A, B, correct[ 6], 15, 0xa3014314); - OP234 (FI, B, C, D, A, correct[ 13], 21, 0x4e0811a1); - OP234 (FI, A, B, C, D, correct[ 4], 6, 0xf7537e82); - OP234 (FI, D, A, B, C, correct[ 11], 10, 0xbd3af235); - OP234 (FI, C, D, A, B, correct[ 2], 15, 0x2ad7d2bb); - OP234 (FI, B, C, D, A, correct[ 9], 21, 0xeb86d391); - - /* Add the starting values of the context. */ - A += A_save; - B += B_save; - C += C_save; - D += D_save; +#define HH(a, b, c, d, x, s, ac) { \ + (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \ + (a) = ROTATE_LEFT ((a), (s)); \ + (a) += (b); \ + } +#define II(a, b, c, d, x, s, ac) { \ + (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \ + (a) = ROTATE_LEFT ((a), (s)); \ + (a) += (b); \ } - /* Put checksum in context given as argument. */ - md5_p->md_A = A; - md5_p->md_B = B; - md5_p->md_C = C; - md5_p->md_D = D; -} - -/* - * md5_get_result - * - * DESCRIPTION: - * - * Copy the resulting MD5 signature from MD5_P into the first 16 bytes - * (MD5_SIZE) of the result buffer. - * - * RETURNS: - * - * None. - * - * ARGUMENTS: - * - * md5_p - Pointer to MD5 structure from which we are getting the result. - * - * result - A 16 byte buffer that will contain the MD5 signature. +/* MD5 initialization. Begins an MD5 operation, writing a new context. */ -static void md5_get_result(const md5_t *md5_p, void *result) +void MD5Init (MD5_CTX *context) { - md5_uint32 hold; - void *res_p = result; + context->count[0] = context->count[1] = 0; - hold = SWAP(md5_p->md_A); - memcpy(res_p, &hold, sizeof(md5_uint32)); - res_p = (char *)res_p + sizeof(md5_uint32); - - hold = SWAP(md5_p->md_B); - memcpy(res_p, &hold, sizeof(md5_uint32)); - res_p = (char *)res_p + sizeof(md5_uint32); - - hold = SWAP(md5_p->md_C); - memcpy(res_p, &hold, sizeof(md5_uint32)); - res_p = (char *)res_p + sizeof(md5_uint32); - - hold = SWAP(md5_p->md_D); - memcpy(res_p, &hold, sizeof(md5_uint32)); + /* Load magic initialization constants. + */ + context->state[0] = 0x67452301; + context->state[1] = 0xefcdab89; + context->state[2] = 0x98badcfe; + context->state[3] = 0x10325476; } -/***************************** exported routines *****************************/ - -/* - * md5_init - * - * DESCRIPTION: - * - * Initialize structure containing state of MD5 computation. (RFC 1321, - * 3.3: Step 3). This is for progressive MD5 calculations only. If - * you have the complete string available, md5_buffer should be used. - * md5_process should be called for each bunch of bytes and after the - * last process call, md5_finish should be called to get the - * signature. - * - * RETURNS: - * - * None. - * - * ARGUMENTS: - * - * md5_p - Pointer to md5 structure that we are initializing. +/* MD5 block update operation. Continues an MD5 message-digest + operation, processing another message block, and updating the + context. */ -void md5_init(md5_t *md5_p) +void MD5Update (MD5_CTX *context, const unsigned char *input, unsigned int inputLen) { - md5_p->md_A = 0x67452301; - md5_p->md_B = 0xefcdab89; - md5_p->md_C = 0x98badcfe; - md5_p->md_D = 0x10325476; - - md5_p->md_total[0] = 0; - md5_p->md_total[1] = 0; - md5_p->md_buf_len = 0; -} + unsigned int i, index, partLen; -/* - * md5_process - * - * DESCRIPTION: - * - * This function is used to progressively calculate a MD5 signature some - * number of bytes at a time. If you have the complete string - * available, md5_buffer should be used. The MD5 structure should - * have been initialized with md5_init and after the last process - * call, md5_finish should be called to get the results. - * - * RETURNS: - * - * None. - * - * ARGUMENTS: - * - * md5_p - Pointer to MD5 structure which we are progressively updating. - * - * buffer - A buffer of bytes whose MD5 signature we are calculating. - * - * buf_len - The length of the buffer. - */ -void md5_process(md5_t *md5_p, const void *buffer, - const unsigned int buf_len) -{ - unsigned int len = buf_len; - unsigned int in_block, add; + /* Compute number of bytes mod 64 */ + index = (unsigned int)((context->count[0] >> 3) & 0x3F); - /* - * When we already have some bytes in our internal buffer, copy some - * from the user to fill the block. + /* Update number of bits */ + if ((context->count[0] += ((UINT4)inputLen << 3)) + < ((UINT4)inputLen << 3)) + context->count[1]++; + context->count[1] += ((UINT4)inputLen >> 29); + + partLen = 64 - index; + + /* Transform as many times as possible. */ - if (md5_p->md_buf_len > 0) { + if (inputLen >= partLen) { + MD5_memcpy + ((POINTER)&context->buffer[index], (POINTER)input, partLen); + MD5Transform (context->state, context->buffer); + + for (i = partLen; i + 63 < inputLen; i += 64) + MD5Transform (context->state, &input[i]); - in_block = md5_p->md_buf_len; - if (in_block + len > sizeof(md5_p->md_buffer)) { - add = sizeof(md5_p->md_buffer) - in_block; - } - else { - add = len; - } - - memcpy (md5_p->md_buffer + in_block, buffer, add); - md5_p->md_buf_len += add; - in_block += add; - - if (in_block > MD5_BLOCK_SIZE) { - process_block (md5_p, md5_p->md_buffer, in_block & ~BLOCK_SIZE_MASK); - /* the regions in the following copy operation will not overlap. */ - memcpy (md5_p->md_buffer, - md5_p->md_buffer + (in_block & ~BLOCK_SIZE_MASK), - in_block & BLOCK_SIZE_MASK); - md5_p->md_buf_len = in_block & BLOCK_SIZE_MASK; - } - - buffer = (const char *)buffer + add; - len -= add; - } - - /* process available complete blocks right from the user buffer */ - if (len > MD5_BLOCK_SIZE) { - process_block (md5_p, buffer, len & ~BLOCK_SIZE_MASK); - buffer = (const char *) buffer + (len & ~BLOCK_SIZE_MASK); - len &= BLOCK_SIZE_MASK; - } - - /* copy remaining bytes into the internal buffer */ - if (len > 0) { - memcpy (md5_p->md_buffer, buffer, len); - md5_p->md_buf_len = len; + index = 0; } + else + i = 0; + + /* Buffer remaining input */ + MD5_memcpy + ((POINTER)&context->buffer[index], (POINTER)&input[i], + inputLen-i); } -/* - * md5_finish - * - * DESCRIPTION: - * - * Finish a progressing MD5 calculation and copy the resulting MD5 - * signature into the result buffer which should be 16 bytes - * (MD5_SIZE). After this call, the MD5 structure is invalid. - * - * RETURNS: - * - * None. - * - * ARGUMENTS: - * - * md5_p - Pointer to MD5 structure which we are finishing. - * - * signature - A 16 byte buffer that will contain the MD5 signature. +/* MD5 finalization. Ends an MD5 message-digest operation, writing the + the message digest and zeroizing the context. */ -void md5_finish(md5_t *md5_p, void *signature) +void MD5Final (MD5_CTX *context, unsigned char digest[16]) { - md5_uint32 bytes, hold; - int pad; + unsigned char bits[8]; + unsigned int index, padLen; - /* take yet unprocessed bytes into account */ - bytes = md5_p->md_buf_len; + /* Save number of bits */ + Encode (bits, context->count, 8); - /* - * Count remaining bytes. Modified to do this to better avoid - * overflows in the lower word -- Gray 10/97. + /* Pad out to 56 mod 64. */ - if (md5_p->md_total[0] > MAX_MD5_UINT32 - bytes) { - md5_p->md_total[1]++; - md5_p->md_total[0] -= (MAX_MD5_UINT32 - bytes); - } - else { - md5_p->md_total[0] += bytes; - } - - /* - * Pad the buffer to the next MD5_BLOCK-byte boundary. (RFC 1321, - * 3.1: Step 1). We need enough room for two size words and the - * bytes left in the buffer. For some reason even if we are equal - * to the block-size, we add an addition block of pad bytes. - */ - pad = MD5_BLOCK_SIZE - (sizeof(md5_uint32) * 2) - bytes; - if (pad <= 0) { - pad += MD5_BLOCK_SIZE; - } + index = (unsigned int)((context->count[0] >> 3) & 0x3f); + padLen = (index < 56) ? (56 - index) : (120 - index); + MD5Update (context, PADDING, padLen); + + /* Append length (before padding) */ + MD5Update (context, bits, 8); - /* - * Modified from a fixed array to this assignment and memset to be - * more flexible with block-sizes -- Gray 10/97. + /* Store state in digest */ + Encode (digest, context->state, 16); + + /* Zeroize sensitive information. */ - if (pad > 0) { - /* some sort of padding start byte */ - md5_p->md_buffer[bytes] = (unsigned char)0x80; - if (pad > 1) { - memset (md5_p->md_buffer + bytes + 1, 0, pad - 1); - } - bytes += pad; - } - - /* put the 64-bit file length in _bits_ (i.e. *8) at the end of the buffer */ - hold = SWAP(md5_p->md_total[0] << 3); - memcpy(md5_p->md_buffer + bytes, &hold, sizeof(md5_uint32)); - bytes += sizeof(md5_uint32); - - /* shift the high word over by 3 and add in the top 3 bits from the low */ - hold = SWAP((md5_p->md_total[1] << 3) | (md5_p->md_total[0] >> 29)); - memcpy(md5_p->md_buffer + bytes, &hold, sizeof(md5_uint32)); - bytes += sizeof(md5_uint32); - - /* process last bytes, the padding chars, and size words */ - process_block(md5_p, md5_p->md_buffer, bytes); - md5_get_result(md5_p, signature); + MD5_memset ((POINTER)context, 0, sizeof (*context)); } -/* - * md5_buffer - * - * DESCRIPTION: - * - * This function is used to calculate a MD5 signature for a buffer of - * bytes. If you only have part of a buffer that you want to process - * then md5_init, md5_process, and md5_finish should be used. - * - * RETURNS: - * - * None. - * - * ARGUMENTS: - * - * buffer - A buffer of bytes whose MD5 signature we are calculating. - * - * buf_len - The length of the buffer. - * - * signature - A 16 byte buffer that will contain the MD5 signature. - */ -void md5_buffer(const char *buffer, const unsigned int buf_len, - void *signature) +void MD5Buffer (const char *buf,unsigned int len,unsigned char sig[16]) { - md5_t md5; - - /* initialize the computation context */ - md5_init(&md5); - - /* process whole buffer but last buf_len % MD5_BLOCK bytes */ - md5_process(&md5, buffer, buf_len); - - /* put result in desired memory area */ - md5_finish(&md5, signature); + MD5_CTX md5; + MD5Init(&md5); + MD5Update(&md5,buf,len); + MD5Final(&md5,sig); } -/* - * md5_sig_to_string - * - * DESCRIPTION: - * - * Convert a MD5 signature in a 16 byte buffer into a hexadecimal string - * representation. - * - * RETURNS: - * - * None. - * - * ARGUMENTS: - * - * signature - a 16 byte buffer that contains the MD5 signature. - * - * str - a string of charactes which should be at least 33 bytes long (2 - * characters per MD5 byte and 1 for the \0). - * - * str_len - the length of the string. - */ -void md5_sig_to_string(void *signature, char *str, const int str_len) +#define HEX_STRING "0123456789abcdef" /* to convert to hex */ + +void MD5SigToString(unsigned char signature[16],char *str,int len) { - unsigned char *sig_p; - char *str_p, *max_p; - unsigned int high, low; - + unsigned char *sig_p; + char *str_p, *max_p; + unsigned int high, low; + str_p = str; - max_p = str + str_len; - + max_p = str + len; + for (sig_p = (unsigned char *)signature; - sig_p < (unsigned char *)signature + MD5_SIZE; - sig_p++) { + sig_p < (unsigned char *)signature + 16; + sig_p++) + { high = *sig_p / 16; low = *sig_p % 16; /* account for 2 chars */ @@ -527,39 +212,141 @@ void md5_sig_to_string(void *signature, char *str, const int str_len) } } -/* - * md5_sig_from_string - * - * DESCRIPTION: - * - * Convert a MD5 signature from a hexadecimal string representation into - * a 16 byte buffer. - * - * RETURNS: - * - * None. - * - * ARGUMENTS: - * - * signature - A 16 byte buffer that will contain the MD5 signature. - * - * str - A string of charactes which _must_ be at least 32 bytes long (2 - * characters per MD5 byte). +/* MD5 basic transformation. Transforms state based on block. */ -void md5_sig_from_string(void *signature, const char *str) +static void MD5Transform (UINT4 state[4], const unsigned char block[64]) { - unsigned char *sig_p; - const char *str_p; - char *hex; - unsigned int high, low, val; + UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16]; - hex = HEX_STRING; - sig_p = signature; + Decode (x, block, 64); + + /* Round 1 */ + FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */ + FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */ + FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */ + FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */ + FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */ + FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */ + FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */ + FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */ + FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */ + FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */ + FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */ + FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */ + FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */ + FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */ + FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */ + FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */ + + /* Round 2 */ + GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */ + GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */ + GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */ + GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */ + GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */ + GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */ + GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */ + GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */ + GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */ + GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */ + GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */ + GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */ + GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */ + GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */ + GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */ + GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */ + + /* Round 3 */ + HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */ + HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */ + HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */ + HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */ + HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */ + HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */ + HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */ + HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */ + HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */ + HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */ + HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */ + HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */ + HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */ + HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */ + HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */ + HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */ + + /* Round 4 */ + II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */ + II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */ + II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */ + II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */ + II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */ + II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */ + II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */ + II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */ + II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */ + II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */ + II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */ + II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */ + II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */ + II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */ + II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */ + II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */ + + state[0] += a; + state[1] += b; + state[2] += c; + state[3] += d; - for (str_p = str; str_p < str + MD5_SIZE * 2; str_p += 2) { - high = strchr(hex, *str_p) - hex; - low = strchr(hex, *(str_p + 1)) - hex; - val = high * 16 + low; - *sig_p++ = val; + /* Zeroize sensitive information. + */ + MD5_memset ((POINTER)x, 0, sizeof (x)); +} + +/* Encodes input (UINT4) into output (unsigned char). Assumes len is + a multiple of 4. + */ +static void Encode (unsigned char *output, UINT4 *input, unsigned int len) +{ + unsigned int i, j; + + for (i = 0, j = 0; j < len; i++, j += 4) { + output[j] = (unsigned char)(input[i] & 0xff); + output[j+1] = (unsigned char)((input[i] >> 8) & 0xff); + output[j+2] = (unsigned char)((input[i] >> 16) & 0xff); + output[j+3] = (unsigned char)((input[i] >> 24) & 0xff); } } + +/* Decodes input (unsigned char) into output (UINT4). Assumes len is + a multiple of 4. + */ +static void Decode (UINT4 *output, const unsigned char *input, unsigned int len) +{ + unsigned int i, j; + + for (i = 0, j = 0; j < len; i++, j += 4) + output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) | + (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24); +} + +/* Note: Replace "for loop" with standard memcpy if possible. + */ +static void MD5_memcpy (POINTER output, POINTER input, unsigned int len) +{ + unsigned int i; + + for (i = 0; i < len; i++) + output[i] = input[i]; +} + +/* Note: Replace "for loop" with standard memset if possible. + */ +static void MD5_memset (POINTER output, int value, unsigned int len) +{ + unsigned int i; + + for (i = 0; i < len; i++) + ((char *)output)[i] = (char)value; +} + + |