summaryrefslogtreecommitdiffstats
path: root/libmd5/md5.c
diff options
context:
space:
mode:
Diffstat (limited to 'libmd5/md5.c')
-rw-r--r--libmd5/md5.c793
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;
+}
+
+