315 lines
8.9 KiB
C
315 lines
8.9 KiB
C
/*
|
|
* This code implements the MD5 message-digest algorithm.
|
|
* The algorithm is due to Ron Rivest. This code was
|
|
* written by Colin Plumb in 1993, no copyright is claimed.
|
|
* This code is in the public domain; do with it what you wish.
|
|
*
|
|
* Equivalent code is available from RSA Data Security, Inc.
|
|
* This code has been tested against that, and is equivalent,
|
|
* except that you don't need to include two pages of legalese
|
|
* with every copy.
|
|
*
|
|
* To compute the message digest of a chunk of bytes, declare an
|
|
* MD5Context structure, pass it to MD5Init, call MD5Update as
|
|
* needed on buffers full of bytes, and then call MD5Final, which
|
|
* will fill a supplied 16-byte array with the digest.
|
|
*/
|
|
|
|
/* This code was modified in 1997 by Jim Kingdon of Cyclic Software to
|
|
not require an integer type which is exactly 32 bits. This work
|
|
draws on the changes for the same purpose by Tatu Ylonen
|
|
<ylo@cs.hut.fi> as part of SSH, but since I didn't actually use
|
|
that code, there is no copyright issue. I hereby disclaim
|
|
copyright in any changes I have made; this code remains in the
|
|
public domain. */
|
|
|
|
#ifdef TEST
|
|
#include <stdlib.h>
|
|
#endif
|
|
|
|
#include <string.h> /* for memcpy() and memset() */
|
|
|
|
#include "md5.h"
|
|
|
|
/* Little-endian byte-swapping routines. Note that these do not
|
|
depend on the size of datatypes such as uint32, nor do they require
|
|
us to detect the endianness of the machine we are running on. It
|
|
is possible they should be macros for speed, but I would be
|
|
surprised if they were a performance bottleneck for MD5. */
|
|
|
|
static uint32
|
|
getu32 (const unsigned char *addr)
|
|
{
|
|
return (((((unsigned long)addr[3] << 8) | addr[2]) << 8)
|
|
| addr[1]) << 8 | addr[0];
|
|
}
|
|
|
|
static void
|
|
putu32 (uint32 data, unsigned char *addr)
|
|
{
|
|
addr[0] = (unsigned char)data;
|
|
addr[1] = (unsigned char)(data >> 8);
|
|
addr[2] = (unsigned char)(data >> 16);
|
|
addr[3] = (unsigned char)(data >> 24);
|
|
}
|
|
|
|
/*
|
|
* Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
|
|
* initialization constants.
|
|
*/
|
|
void
|
|
MD5Init (ctx)
|
|
struct MD5Context *ctx;
|
|
{
|
|
ctx->buf[0] = 0x67452301;
|
|
ctx->buf[1] = 0xefcdab89;
|
|
ctx->buf[2] = 0x98badcfe;
|
|
ctx->buf[3] = 0x10325476;
|
|
|
|
ctx->bits[0] = 0;
|
|
ctx->bits[1] = 0;
|
|
}
|
|
|
|
/*
|
|
* Update context to reflect the concatenation of another buffer full
|
|
* of bytes.
|
|
*/
|
|
void
|
|
MD5Update (ctx, buf, len)
|
|
struct MD5Context *ctx;
|
|
unsigned char const *buf;
|
|
unsigned len;
|
|
{
|
|
uint32 t;
|
|
|
|
/* Update bitcount */
|
|
|
|
t = ctx->bits[0];
|
|
if ((ctx->bits[0] = (t + ((uint32)len << 3)) & 0xffffffff) < t)
|
|
ctx->bits[1]++; /* Carry from low to high */
|
|
ctx->bits[1] += len >> 29;
|
|
|
|
t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */
|
|
|
|
/* Handle any leading odd-sized chunks */
|
|
|
|
if ( t ) {
|
|
unsigned char *p = ctx->in + t;
|
|
|
|
t = 64-t;
|
|
if (len < t) {
|
|
memcpy(p, buf, len);
|
|
return;
|
|
}
|
|
memcpy(p, buf, t);
|
|
MD5Transform (ctx->buf, ctx->in);
|
|
buf += t;
|
|
len -= t;
|
|
}
|
|
|
|
/* Process data in 64-byte chunks */
|
|
|
|
while (len >= 64) {
|
|
memcpy(ctx->in, buf, 64);
|
|
MD5Transform (ctx->buf, ctx->in);
|
|
buf += 64;
|
|
len -= 64;
|
|
}
|
|
|
|
/* Handle any remaining bytes of data. */
|
|
|
|
memcpy(ctx->in, buf, len);
|
|
}
|
|
|
|
/*
|
|
* Final wrapup - pad to 64-byte boundary with the bit pattern
|
|
* 1 0* (64-bit count of bits processed, MSB-first)
|
|
*/
|
|
void
|
|
MD5Final (digest, ctx)
|
|
unsigned char digest[16];
|
|
struct MD5Context *ctx;
|
|
{
|
|
unsigned count;
|
|
unsigned char *p;
|
|
|
|
/* Compute number of bytes mod 64 */
|
|
count = (ctx->bits[0] >> 3) & 0x3F;
|
|
|
|
/* Set the first char of padding to 0x80. This is safe since there is
|
|
always at least one byte free */
|
|
p = ctx->in + count;
|
|
*p++ = 0x80;
|
|
|
|
/* Bytes of padding needed to make 64 bytes */
|
|
count = 64 - 1 - count;
|
|
|
|
/* Pad out to 56 mod 64 */
|
|
if (count < 8) {
|
|
/* Two lots of padding: Pad the first block to 64 bytes */
|
|
memset(p, 0, count);
|
|
MD5Transform (ctx->buf, ctx->in);
|
|
|
|
/* Now fill the next block with 56 bytes */
|
|
memset(ctx->in, 0, 56);
|
|
} else {
|
|
/* Pad block to 56 bytes */
|
|
memset(p, 0, count-8);
|
|
}
|
|
|
|
/* Append length in bits and transform */
|
|
putu32(ctx->bits[0], ctx->in + 56);
|
|
putu32(ctx->bits[1], ctx->in + 60);
|
|
|
|
MD5Transform (ctx->buf, ctx->in);
|
|
putu32(ctx->buf[0], digest);
|
|
putu32(ctx->buf[1], digest + 4);
|
|
putu32(ctx->buf[2], digest + 8);
|
|
putu32(ctx->buf[3], digest + 12);
|
|
memset(ctx, 0, sizeof(*ctx)); /* In case it's sensitive */
|
|
}
|
|
|
|
#ifndef ASM_MD5
|
|
|
|
/* The four core functions - F1 is optimized somewhat */
|
|
|
|
/* #define F1(x, y, z) (x & y | ~x & z) */
|
|
#define F1(x, y, z) (z ^ (x & (y ^ z)))
|
|
#define F2(x, y, z) F1(z, x, y)
|
|
#define F3(x, y, z) (x ^ y ^ z)
|
|
#define F4(x, y, z) (y ^ (x | ~z))
|
|
|
|
/* This is the central step in the MD5 algorithm. */
|
|
#define MD5STEP(f, w, x, y, z, data, s) \
|
|
( w += f(x, y, z) + data, w &= 0xffffffff, w = w<<s | w>>(32-s), w += x )
|
|
|
|
/*
|
|
* The core of the MD5 algorithm, this alters an existing MD5 hash to
|
|
* reflect the addition of 16 longwords of new data. MD5Update blocks
|
|
* the data and converts bytes into longwords for this routine.
|
|
*/
|
|
void
|
|
MD5Transform (buf, inraw)
|
|
uint32 buf[4];
|
|
const unsigned char inraw[64];
|
|
{
|
|
register uint32 a, b, c, d;
|
|
uint32 in[16];
|
|
int i;
|
|
|
|
for (i = 0; i < 16; ++i)
|
|
in[i] = getu32 (inraw + 4 * i);
|
|
|
|
a = buf[0];
|
|
b = buf[1];
|
|
c = buf[2];
|
|
d = buf[3];
|
|
|
|
MD5STEP(F1, a, b, c, d, in[ 0]+0xd76aa478, 7);
|
|
MD5STEP(F1, d, a, b, c, in[ 1]+0xe8c7b756, 12);
|
|
MD5STEP(F1, c, d, a, b, in[ 2]+0x242070db, 17);
|
|
MD5STEP(F1, b, c, d, a, in[ 3]+0xc1bdceee, 22);
|
|
MD5STEP(F1, a, b, c, d, in[ 4]+0xf57c0faf, 7);
|
|
MD5STEP(F1, d, a, b, c, in[ 5]+0x4787c62a, 12);
|
|
MD5STEP(F1, c, d, a, b, in[ 6]+0xa8304613, 17);
|
|
MD5STEP(F1, b, c, d, a, in[ 7]+0xfd469501, 22);
|
|
MD5STEP(F1, a, b, c, d, in[ 8]+0x698098d8, 7);
|
|
MD5STEP(F1, d, a, b, c, in[ 9]+0x8b44f7af, 12);
|
|
MD5STEP(F1, c, d, a, b, in[10]+0xffff5bb1, 17);
|
|
MD5STEP(F1, b, c, d, a, in[11]+0x895cd7be, 22);
|
|
MD5STEP(F1, a, b, c, d, in[12]+0x6b901122, 7);
|
|
MD5STEP(F1, d, a, b, c, in[13]+0xfd987193, 12);
|
|
MD5STEP(F1, c, d, a, b, in[14]+0xa679438e, 17);
|
|
MD5STEP(F1, b, c, d, a, in[15]+0x49b40821, 22);
|
|
|
|
MD5STEP(F2, a, b, c, d, in[ 1]+0xf61e2562, 5);
|
|
MD5STEP(F2, d, a, b, c, in[ 6]+0xc040b340, 9);
|
|
MD5STEP(F2, c, d, a, b, in[11]+0x265e5a51, 14);
|
|
MD5STEP(F2, b, c, d, a, in[ 0]+0xe9b6c7aa, 20);
|
|
MD5STEP(F2, a, b, c, d, in[ 5]+0xd62f105d, 5);
|
|
MD5STEP(F2, d, a, b, c, in[10]+0x02441453, 9);
|
|
MD5STEP(F2, c, d, a, b, in[15]+0xd8a1e681, 14);
|
|
MD5STEP(F2, b, c, d, a, in[ 4]+0xe7d3fbc8, 20);
|
|
MD5STEP(F2, a, b, c, d, in[ 9]+0x21e1cde6, 5);
|
|
MD5STEP(F2, d, a, b, c, in[14]+0xc33707d6, 9);
|
|
MD5STEP(F2, c, d, a, b, in[ 3]+0xf4d50d87, 14);
|
|
MD5STEP(F2, b, c, d, a, in[ 8]+0x455a14ed, 20);
|
|
MD5STEP(F2, a, b, c, d, in[13]+0xa9e3e905, 5);
|
|
MD5STEP(F2, d, a, b, c, in[ 2]+0xfcefa3f8, 9);
|
|
MD5STEP(F2, c, d, a, b, in[ 7]+0x676f02d9, 14);
|
|
MD5STEP(F2, b, c, d, a, in[12]+0x8d2a4c8a, 20);
|
|
|
|
MD5STEP(F3, a, b, c, d, in[ 5]+0xfffa3942, 4);
|
|
MD5STEP(F3, d, a, b, c, in[ 8]+0x8771f681, 11);
|
|
MD5STEP(F3, c, d, a, b, in[11]+0x6d9d6122, 16);
|
|
MD5STEP(F3, b, c, d, a, in[14]+0xfde5380c, 23);
|
|
MD5STEP(F3, a, b, c, d, in[ 1]+0xa4beea44, 4);
|
|
MD5STEP(F3, d, a, b, c, in[ 4]+0x4bdecfa9, 11);
|
|
MD5STEP(F3, c, d, a, b, in[ 7]+0xf6bb4b60, 16);
|
|
MD5STEP(F3, b, c, d, a, in[10]+0xbebfbc70, 23);
|
|
MD5STEP(F3, a, b, c, d, in[13]+0x289b7ec6, 4);
|
|
MD5STEP(F3, d, a, b, c, in[ 0]+0xeaa127fa, 11);
|
|
MD5STEP(F3, c, d, a, b, in[ 3]+0xd4ef3085, 16);
|
|
MD5STEP(F3, b, c, d, a, in[ 6]+0x04881d05, 23);
|
|
MD5STEP(F3, a, b, c, d, in[ 9]+0xd9d4d039, 4);
|
|
MD5STEP(F3, d, a, b, c, in[12]+0xe6db99e5, 11);
|
|
MD5STEP(F3, c, d, a, b, in[15]+0x1fa27cf8, 16);
|
|
MD5STEP(F3, b, c, d, a, in[ 2]+0xc4ac5665, 23);
|
|
|
|
MD5STEP(F4, a, b, c, d, in[ 0]+0xf4292244, 6);
|
|
MD5STEP(F4, d, a, b, c, in[ 7]+0x432aff97, 10);
|
|
MD5STEP(F4, c, d, a, b, in[14]+0xab9423a7, 15);
|
|
MD5STEP(F4, b, c, d, a, in[ 5]+0xfc93a039, 21);
|
|
MD5STEP(F4, a, b, c, d, in[12]+0x655b59c3, 6);
|
|
MD5STEP(F4, d, a, b, c, in[ 3]+0x8f0ccc92, 10);
|
|
MD5STEP(F4, c, d, a, b, in[10]+0xffeff47d, 15);
|
|
MD5STEP(F4, b, c, d, a, in[ 1]+0x85845dd1, 21);
|
|
MD5STEP(F4, a, b, c, d, in[ 8]+0x6fa87e4f, 6);
|
|
MD5STEP(F4, d, a, b, c, in[15]+0xfe2ce6e0, 10);
|
|
MD5STEP(F4, c, d, a, b, in[ 6]+0xa3014314, 15);
|
|
MD5STEP(F4, b, c, d, a, in[13]+0x4e0811a1, 21);
|
|
MD5STEP(F4, a, b, c, d, in[ 4]+0xf7537e82, 6);
|
|
MD5STEP(F4, d, a, b, c, in[11]+0xbd3af235, 10);
|
|
MD5STEP(F4, c, d, a, b, in[ 2]+0x2ad7d2bb, 15);
|
|
MD5STEP(F4, b, c, d, a, in[ 9]+0xeb86d391, 21);
|
|
|
|
buf[0] += a;
|
|
buf[1] += b;
|
|
buf[2] += c;
|
|
buf[3] += d;
|
|
}
|
|
#endif
|
|
|
|
#ifdef TEST
|
|
/* Simple test program. Can use it to manually run the tests from
|
|
RFC1321 for example. */
|
|
#include <stdio.h>
|
|
|
|
int
|
|
main (int argc, char **argv)
|
|
{
|
|
struct MD5Context context;
|
|
unsigned char checksum[16];
|
|
int i;
|
|
int j;
|
|
|
|
if (argc < 2)
|
|
{
|
|
fprintf (stderr, "usage: %s string-to-hash\n", argv[0]);
|
|
exit (1);
|
|
}
|
|
for (j = 1; j < argc; ++j)
|
|
{
|
|
printf ("MD5 (\"%s\") = ", argv[j]);
|
|
MD5Init (&context);
|
|
MD5Update (&context, (unsigned char *)argv[j], strlen (argv[j]));
|
|
MD5Final (checksum, &context);
|
|
for (i = 0; i < 16; i++)
|
|
{
|
|
printf ("%02x", (unsigned int) checksum[i]);
|
|
}
|
|
printf ("\n");
|
|
}
|
|
return 0;
|
|
}
|
|
#endif /* TEST */
|