/* @(#)md5c.c 1.4 06/05/02 Copyright 1998,1999 Heiko Eissfeldt */
#ifndef lint
static char sccsid[] =
"@(#)md5c.c 1.4 06/05/02 Copyright 1998,1999 Heiko Eissfeldt";
#endif
/*
* MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
*/
/*
* 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.
*/
#include "config.h"
#include "mytype.h"
#include "md5.h"
/*
* Constants for MD5Transform routine.
*/
#define S11 7L
#define S12 12L
#define S13 17L
#define S14 22L
#define S21 5L
#define S22 9L
#define S23 14L
#define S24 20L
#define S31 4L
#define S32 11L
#define S33 16L
#define S34 23L
#define S41 6L
#define S42 10L
#define S43 15L
#define S44 21L
typedef unsigned char *POINTER;
static void MD5Transform __PR((UINT4 [4], unsigned char [64]));
static void Encode __PR((unsigned char *, UINT4 *, unsigned int));
static void Decode __PR((UINT4 *, unsigned char *, unsigned int));
static void MD5_memcpy __PR((POINTER, POINTER, unsigned int));
static void MD5_memset __PR((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)))
/*
* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32L-(n))))
/*
* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
* Rotation is separate from addition to prevent recomputation.
*/
#define FF(a, b, c, d, x, s, ac) { \
(a) += F((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT((a), (s)); \
(a) += (b); \
}
#define GG(a, b, c, d, x, s, ac) { \
(a) += G((b), (c), (d)) + (x) + (UINT4)(ac); \
(a) = ROTATE_LEFT((a), (s)); \
(a) += (b); \
}
#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); \
}
/*
* MD5 initialization. Begins an MD5 operation, writing a new context.
*/
void
MD5Init(context)
MD5_CTX *context; /* context */
{
context->count[0] = context->count[1] = 0;
/*
* Load magic initialization constants.
*/
context->state[0] = UINT4_C(0x67452301);
context->state[1] = UINT4_C(0xefcdab89);
context->state[2] = UINT4_C(0x98badcfe);
context->state[3] = UINT4_C(0x10325476);
}
/*
* MD5 block update operation. Continues an MD5 message-digest
* operation, processing another message block, and updating the
* context.
*/
void
MD5Update(context, input, inputLen)
MD5_CTX *context; /* context */
unsigned char *input; /* input block */
unsigned int inputLen; /* length of input block */
{
unsigned int i;
unsigned int indx;
unsigned int partLen;
/*
* Compute number of bytes mod 64
*/
indx = (unsigned int)((context->count[0] >> 3L) & 0x3F);
/*
* Update number of bits
*/
if ((context->count[0] += ((UINT4)inputLen << 3L))
< ((UINT4)inputLen << 3L))
context->count[1]++;
context->count[1] += ((UINT4)inputLen >> 29L);
partLen = 64 - indx;
/*
* Transform as many times as possible.
*/
if (inputLen >= partLen) {
MD5_memcpy((POINTER)&context->buffer[indx],
(POINTER)input, partLen);
MD5Transform(context->state, context->buffer);
for (i = partLen; i + 63 < inputLen; i += 64)
MD5Transform(context->state, &input[i]);
indx = 0;
} else
i = 0;
/*
* Buffer remaining input
*/
MD5_memcpy((POINTER)&context->buffer[indx],
(POINTER)&input[i],
inputLen-i);
}
/*
* MD5 finalization. Ends an MD5 message-digest operation, writing the
* the message digest and zeroizing the context.
*/
void
MD5Final(digest, context)
unsigned char digest[16]; /* message digest */
MD5_CTX *context; /* context */
{
unsigned char bits[8];
unsigned int indx;
unsigned int padLen;
/*
* Save number of bits
*/
Encode(bits, context->count, 8);
/*
* Pad out to 56 mod 64.
*/
indx = (unsigned int)((context->count[0] >> 3L) & 0x3f);
padLen = (indx < 56) ? (56 - indx) : (120 - indx);
MD5Update(context, PADDING, padLen);
/*
* Append length (before padding)
*/
MD5Update(context, bits, 8);
/*
* Store state in digest
*/
Encode(digest, context->state, 16);
/*
* Zeroize sensitive information.
*/
MD5_memset((POINTER)context, 0, sizeof (*context));
}
/*
* MD5 basic transformation. Transforms state based on block.
*/
static void
MD5Transform(state, block)
UINT4 state[4];
unsigned char block[64];
{
UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
Decode(x, block, 64);
/*
* Round 1
*/
FF(a, b, c, d, x[ 0], S11, UINT4_C(0xd76aa478)); /* 1 */
FF(d, a, b, c, x[ 1], S12, UINT4_C(0xe8c7b756)); /* 2 */
FF(c, d, a, b, x[ 2], S13, UINT4_C(0x242070db)); /* 3 */
FF(b, c, d, a, x[ 3], S14, UINT4_C(0xc1bdceee)); /* 4 */
FF(a, b, c, d, x[ 4], S11, UINT4_C(0xf57c0faf)); /* 5 */
FF(d, a, b, c, x[ 5], S12, UINT4_C(0x4787c62a)); /* 6 */
FF(c, d, a, b, x[ 6], S13, UINT4_C(0xa8304613)); /* 7 */
FF(b, c, d, a, x[ 7], S14, UINT4_C(0xfd469501)); /* 8 */
FF(a, b, c, d, x[ 8], S11, UINT4_C(0x698098d8)); /* 9 */
FF(d, a, b, c, x[ 9], S12, UINT4_C(0x8b44f7af)); /* 10 */
FF(c, d, a, b, x[10], S13, UINT4_C(0xffff5bb1)); /* 11 */
FF(b, c, d, a, x[11], S14, UINT4_C(0x895cd7be)); /* 12 */
FF(a, b, c, d, x[12], S11, UINT4_C(0x6b901122)); /* 13 */
FF(d, a, b, c, x[13], S12, UINT4_C(0xfd987193)); /* 14 */
FF(c, d, a, b, x[14], S13, UINT4_C(0xa679438e)); /* 15 */
FF(b, c, d, a, x[15], S14, UINT4_C(0x49b40821)); /* 16 */
/*
* Round 2
*/
GG(a, b, c, d, x[ 1], S21, UINT4_C(0xf61e2562)); /* 17 */
GG(d, a, b, c, x[ 6], S22, UINT4_C(0xc040b340)); /* 18 */
GG(c, d, a, b, x[11], S23, UINT4_C(0x265e5a51)); /* 19 */
GG(b, c, d, a, x[ 0], S24, UINT4_C(0xe9b6c7aa)); /* 20 */
GG(a, b, c, d, x[ 5], S21, UINT4_C(0xd62f105d)); /* 21 */
GG(d, a, b, c, x[10], S22, UINT4_C(0x2441453)); /* 22 */
GG(c, d, a, b, x[15], S23, UINT4_C(0xd8a1e681)); /* 23 */
GG(b, c, d, a, x[ 4], S24, UINT4_C(0xe7d3fbc8)); /* 24 */
GG(a, b, c, d, x[ 9], S21, UINT4_C(0x21e1cde6)); /* 25 */
GG(d, a, b, c, x[14], S22, UINT4_C(0xc33707d6)); /* 26 */
GG(c, d, a, b, x[ 3], S23, UINT4_C(0xf4d50d87)); /* 27 */
GG(b, c, d, a, x[ 8], S24, UINT4_C(0x455a14ed)); /* 28 */
GG(a, b, c, d, x[13], S21, UINT4_C(0xa9e3e905)); /* 29 */
GG(d, a, b, c, x[ 2], S22, UINT4_C(0xfcefa3f8)); /* 30 */
GG(c, d, a, b, x[ 7], S23, UINT4_C(0x676f02d9)); /* 31 */
GG(b, c, d, a, x[12], S24, UINT4_C(0x8d2a4c8a)); /* 32 */
/*
* Round 3
*/
HH(a, b, c, d, x[ 5], S31, UINT4_C(0xfffa3942)); /* 33 */
HH(d, a, b, c, x[ 8], S32, UINT4_C(0x8771f681)); /* 34 */
HH(c, d, a, b, x[11], S33, UINT4_C(0x6d9d6122)); /* 35 */
HH(b, c, d, a, x[14], S34, UINT4_C(0xfde5380c)); /* 36 */
HH(a, b, c, d, x[ 1], S31, UINT4_C(0xa4beea44)); /* 37 */
HH(d, a, b, c, x[ 4], S32, UINT4_C(0x4bdecfa9)); /* 38 */
HH(c, d, a, b, x[ 7], S33, UINT4_C(0xf6bb4b60)); /* 39 */
HH(b, c, d, a, x[10], S34, UINT4_C(0xbebfbc70)); /* 40 */
HH(a, b, c, d, x[13], S31, UINT4_C(0x289b7ec6)); /* 41 */
HH(d, a, b, c, x[ 0], S32, UINT4_C(0xeaa127fa)); /* 42 */
HH(c, d, a, b, x[ 3], S33, UINT4_C(0xd4ef3085)); /* 43 */
HH(b, c, d, a, x[ 6], S34, UINT4_C(0x4881d05)); /* 44 */
HH(a, b, c, d, x[ 9], S31, UINT4_C(0xd9d4d039)); /* 45 */
HH(d, a, b, c, x[12], S32, UINT4_C(0xe6db99e5)); /* 46 */
HH(c, d, a, b, x[15], S33, UINT4_C(0x1fa27cf8)); /* 47 */
HH(b, c, d, a, x[ 2], S34, UINT4_C(0xc4ac5665)); /* 48 */
/*
* Round 4
*/
II(a, b, c, d, x[ 0], S41, UINT4_C(0xf4292244)); /* 49 */
II(d, a, b, c, x[ 7], S42, UINT4_C(0x432aff97)); /* 50 */
II(c, d, a, b, x[14], S43, UINT4_C(0xab9423a7)); /* 51 */
II(b, c, d, a, x[ 5], S44, UINT4_C(0xfc93a039)); /* 52 */
II(a, b, c, d, x[12], S41, UINT4_C(0x655b59c3)); /* 53 */
II(d, a, b, c, x[ 3], S42, UINT4_C(0x8f0ccc92)); /* 54 */
II(c, d, a, b, x[10], S43, UINT4_C(0xffeff47d)); /* 55 */
II(b, c, d, a, x[ 1], S44, UINT4_C(0x85845dd1)); /* 56 */
II(a, b, c, d, x[ 8], S41, UINT4_C(0x6fa87e4f)); /* 57 */
II(d, a, b, c, x[15], S42, UINT4_C(0xfe2ce6e0)); /* 58 */
II(c, d, a, b, x[ 6], S43, UINT4_C(0xa3014314)); /* 59 */
II(b, c, d, a, x[13], S44, UINT4_C(0x4e0811a1)); /* 60 */
II(a, b, c, d, x[ 4], S41, UINT4_C(0xf7537e82)); /* 61 */
II(d, a, b, c, x[11], S42, UINT4_C(0xbd3af235)); /* 62 */
II(c, d, a, b, x[ 2], S43, UINT4_C(0x2ad7d2bb)); /* 63 */
II(b, c, d, a, x[ 9], S44, UINT4_C(0xeb86d391)); /* 64 */
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
/*
* 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(output, input, len)
unsigned char *output;
UINT4 *input;
unsigned int len;
{
unsigned int i;
unsigned int 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] >> 8L) & 0xff);
output[j+2] = (unsigned char)((input[i] >> 16L) & 0xff);
output[j+3] = (unsigned char)((input[i] >> 24L) & 0xff);
}
}
/*
* Decodes input (unsigned char) into output (UINT4). Assumes len is
* a multiple of 4.
*/
static void
Decode(output, input, len)
UINT4 *output;
unsigned char *input;
unsigned int len;
{
unsigned int i;
unsigned int j;
for (i = 0, j = 0; j < len; i++, j += 4) {
output[i] = ((UINT4)input[j]) |
(((UINT4)input[j+1]) << 8L) |
(((UINT4)input[j+2]) << 16L) |
(((UINT4)input[j+3]) << 24L);
}
}
/*
* Note: Replace "for loop" with standard memcpy if possible.
*/
static void
MD5_memcpy(output, input, len)
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(output, value, len)
POINTER output;
int value;
unsigned int len;
{
unsigned int i;
for (i = 0; i < len; i++)
((char *)output)[i] = (char)value;
}
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