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Rename members of struct MD5Context to match other hash routines. 

Add constants for buffer lengths and use them.
Make bit count 64bit based on changes by niklas@ long ago.
Conver htole32n() to macros and unroll loops.
OPENBSD_3_6
millert 20 years ago
parent
95118666b1
commit
2ee8a23109
2 changed files with 157 additions and 123 deletions
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  1. +18
    -14
      src/include/md5.h
  2. +139
    -109
      src/lib/libc/hash/md5.c

+ 18
- 14
src/include/md5.h View File

@ -1,4 +1,4 @@
/* $OpenBSD: md5.h,v 1.12 2004/04/28 16:46:02 millert Exp $ */
/* $OpenBSD: md5.h,v 1.13 2004/04/28 16:52:08 millert Exp $ */
/* /*
* This code implements the MD5 message-digest algorithm. * This code implements the MD5 message-digest algorithm.
@ -15,10 +15,14 @@
#ifndef _MD5_H_ #ifndef _MD5_H_
#define _MD5_H_ #define _MD5_H_
#define MD5_BLOCK_LENGTH 64
#define MD5_DIGEST_LENGTH 16
#define MD5_DIGEST_STRING_LENGTH (MD5_DIGEST_LENGTH * 2 + 1)
typedef struct MD5Context { typedef struct MD5Context {
u_int32_t buf[4]; /* state */
u_int32_t bits[2]; /* number of bits, mod 2^64 */
unsigned char in[64]; /* input buffer */
u_int32_t state[4]; /* state */
u_int64_t count; /* number of bits, mod 2^64 */
u_int8_t buffer[MD5_BLOCK_LENGTH]; /* input buffer */
} MD5_CTX; } MD5_CTX;
#include <sys/cdefs.h> #include <sys/cdefs.h>
@ -27,18 +31,18 @@ __BEGIN_DECLS
void MD5Init(MD5_CTX *); void MD5Init(MD5_CTX *);
void MD5Update(MD5_CTX *, const u_int8_t *, size_t) void MD5Update(MD5_CTX *, const u_int8_t *, size_t)
__attribute__((__bounded__(__string__,2,3))); __attribute__((__bounded__(__string__,2,3)));
void MD5Final(u_int8_t [16], MD5_CTX *)
__attribute__((__bounded__(__minbytes__,1,16)));
void MD5Transform(u_int32_t [4], const u_int8_t [64])
void MD5Final(u_int8_t [MD5_DIGEST_LENGTH], MD5_CTX *)
__attribute__((__bounded__(__minbytes__,1,MD5_DIGEST_LENGTH)));
void MD5Transform(u_int32_t [4], const u_int8_t [MD5_BLOCK_LENGTH])
__attribute__((__bounded__(__minbytes__,1,4))) __attribute__((__bounded__(__minbytes__,1,4)))
__attribute__((__bounded__(__minbytes__,2,64)));
char *MD5End(MD5_CTX *, char [33])
__attribute__((__bounded__(__minbytes__,2,33)));
char *MD5File(char *, char [33])
__attribute__((__bounded__(__minbytes__,2,33)));
char *MD5Data(const u_int8_t *, size_t, char [33])
__attribute__((__bounded__(__minbytes__,2,MD5_BLOCK_LENGTH)));
char *MD5End(MD5_CTX *, char [MD5_DIGEST_STRING_LENGTH])
__attribute__((__bounded__(__minbytes__,2,MD5_DIGEST_STRING_LENGTH)));
char *MD5File(char *, char [MD5_DIGEST_STRING_LENGTH])
__attribute__((__bounded__(__minbytes__,2,MD5_DIGEST_STRING_LENGTH)));
char *MD5Data(const u_int8_t *, size_t, char [MD5_DIGEST_STRING_LENGTH])
__attribute__((__bounded__(__string__,1,2))) __attribute__((__bounded__(__string__,1,2)))
__attribute__((__bounded__(__minbytes__,3,33)));
__attribute__((__bounded__(__minbytes__,3,MD5_DIGEST_STRING_LENGTH)));
__END_DECLS __END_DECLS
#endif /* _MD5_H_ */ #endif /* _MD5_H_ */

+ 139
- 109
src/lib/libc/hash/md5.c View File

@ -1,4 +1,4 @@
/* $OpenBSD: md5.c,v 1.1 2004/04/28 16:46:03 millert Exp $ */
/* $OpenBSD: md5.c,v 1.2 2004/04/28 16:52:08 millert Exp $ */
/* /*
* This code implements the MD5 message-digest algorithm. * This code implements the MD5 message-digest algorithm.
@ -18,7 +18,7 @@
*/ */
#if defined(LIBC_SCCS) && !defined(lint) #if defined(LIBC_SCCS) && !defined(lint)
static const char rcsid[] = "$OpenBSD: md5.c,v 1.1 2004/04/28 16:46:03 millert Exp $";
static const char rcsid[] = "$OpenBSD: md5.c,v 1.2 2004/04/28 16:52:08 millert Exp $";
#endif /* LIBC_SCCS and not lint */ #endif /* LIBC_SCCS and not lint */
#include <sys/types.h> #include <sys/types.h>
@ -26,20 +26,56 @@ static const char rcsid[] = "$OpenBSD: md5.c,v 1.1 2004/04/28 16:46:03 millert E
#include <md5.h> #include <md5.h>
#if BYTE_ORDER == LITTLE_ENDIAN #if BYTE_ORDER == LITTLE_ENDIAN
#define htole32n(buf, n) /* Nothing */
#define htole32_4(buf) /* Nothing */
#define htole32_14(buf) /* Nothing */
#define htole32_16(buf) /* Nothing */
#else #else
/*
* Note: this code is harmless on little-endian machines.
* XXX - unroll calls to htole32n -> htole32?
*/
void
htole32n(u_int32_t *buf, size_t n)
{
while (n--) {
*buf = htole32(*buf);
buf++;
}
}
#define htole32_4(buf) do { \
(buf)[ 0] = htole32((buf)[ 0]); \
(buf)[ 1] = htole32((buf)[ 1]); \
(buf)[ 2] = htole32((buf)[ 2]); \
(buf)[ 3] = htole32((buf)[ 3]); \
} while (0)
#define htole32_14(buf) do { \
(buf)[ 0] = htole32((buf)[ 0]); \
(buf)[ 1] = htole32((buf)[ 1]); \
(buf)[ 2] = htole32((buf)[ 2]); \
(buf)[ 3] = htole32((buf)[ 3]); \
(buf)[ 4] = htole32((buf)[ 4]); \
(buf)[ 5] = htole32((buf)[ 5]); \
(buf)[ 6] = htole32((buf)[ 6]); \
(buf)[ 7] = htole32((buf)[ 7]); \
(buf)[ 8] = htole32((buf)[ 8]); \
(buf)[ 9] = htole32((buf)[ 9]); \
(buf)[10] = htole32((buf)[10]); \
(buf)[11] = htole32((buf)[11]); \
(buf)[12] = htole32((buf)[12]); \
(buf)[13] = htole32((buf)[13]); \
} while (0)
#define htole32_16(buf) do { \
(buf)[ 0] = htole32((buf)[ 0]); \
(buf)[ 1] = htole32((buf)[ 1]); \
(buf)[ 2] = htole32((buf)[ 2]); \
(buf)[ 3] = htole32((buf)[ 3]); \
(buf)[ 4] = htole32((buf)[ 4]); \
(buf)[ 5] = htole32((buf)[ 5]); \
(buf)[ 6] = htole32((buf)[ 6]); \
(buf)[ 7] = htole32((buf)[ 7]); \
(buf)[ 8] = htole32((buf)[ 8]); \
(buf)[ 9] = htole32((buf)[ 9]); \
(buf)[10] = htole32((buf)[10]); \
(buf)[11] = htole32((buf)[11]); \
(buf)[12] = htole32((buf)[12]); \
(buf)[13] = htole32((buf)[13]); \
(buf)[14] = htole32((buf)[14]); \
(buf)[15] = htole32((buf)[15]); \
} while (0)
#endif #endif
/* /*
@ -49,13 +85,11 @@ htole32n(u_int32_t *buf, size_t n)
void void
MD5Init(MD5_CTX *ctx) MD5Init(MD5_CTX *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;
ctx->count = 0;
ctx->state[0] = 0x67452301;
ctx->state[1] = 0xefcdab89;
ctx->state[2] = 0x98badcfe;
ctx->state[3] = 0x10325476;
} }
/* /*
@ -65,45 +99,41 @@ MD5Init(MD5_CTX *ctx)
void void
MD5Update(MD5_CTX *ctx, const unsigned char *buf, size_t len) MD5Update(MD5_CTX *ctx, const unsigned char *buf, size_t len)
{ {
u_int32_t t;
u_int32_t count;
/* Update bitcount */
/* Bytes already stored in ctx->buffer */
count = (u_int32_t)((ctx->count >> 3) & 0x3f);
t = ctx->bits[0];
if ((ctx->bits[0] = t + ((u_int32_t)len << 3)) < t)
ctx->bits[1]++; /* Carry from low to high */
ctx->bits[1] += len >> 29;
t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */
/* Update bitcount */
ctx->count += (u_int64_t)len << 3;
/* Handle any leading odd-sized chunks */ /* Handle any leading odd-sized chunks */
if (count) {
unsigned char *p = (unsigned char *)ctx->buffer + count;
if (t) {
unsigned char *p = (unsigned char *)ctx->in + t;
t = 64 - t;
if (len < t) {
count = MD5_BLOCK_LENGTH - count;
if (len < count) {
memcpy(p, buf, len); memcpy(p, buf, len);
return; return;
} }
memcpy(p, buf, t);
htole32n((u_int32_t *)ctx->in, 16);
MD5Transform(ctx->buf, ctx->in);
buf += t;
len -= t;
memcpy(p, buf, count);
htole32_16((u_int32_t *)ctx->buffer);
MD5Transform(ctx->state, ctx->buffer);
buf += count;
len -= count;
} }
/* Process data in 64-byte chunks */
while (len >= 64) {
memcpy(ctx->in, buf, 64);
htole32n((u_int32_t *)ctx->in, 16);
MD5Transform(ctx->buf, ctx->in);
buf += 64;
len -= 64;
/* Process data in MD5_BLOCK_LENGTH-byte chunks */
while (len >= MD5_BLOCK_LENGTH) {
memcpy(ctx->buffer, buf, MD5_BLOCK_LENGTH);
htole32_16((u_int32_t *)ctx->buffer);
MD5Transform(ctx->state, ctx->buffer);
buf += MD5_BLOCK_LENGTH;
len -= MD5_BLOCK_LENGTH;
} }
/* Handle any remaining bytes of data. */ /* Handle any remaining bytes of data. */
memcpy(ctx->in, buf, len);
memcpy(ctx->buffer, buf, len);
} }
/* /*
@ -111,19 +141,19 @@ MD5Update(MD5_CTX *ctx, const unsigned char *buf, size_t len)
* 1 0* (64-bit count of bits processed, MSB-first) * 1 0* (64-bit count of bits processed, MSB-first)
*/ */
void void
MD5Final(unsigned char digest[16], MD5_CTX *ctx)
MD5Final(unsigned char digest[MD5_DIGEST_LENGTH], MD5_CTX *ctx)
{ {
size_t count;
u_int32_t count;
unsigned char *p; unsigned char *p;
/* number of bytes mod 64 */ /* number of bytes mod 64 */
count = (ctx->bits[0] >> 3) & 0x3F;
count = (u_int32_t)(ctx->count >> 3) & 0x3f;
/* /*
* Set the first char of padding to 0x80. * Set the first char of padding to 0x80.
* This is safe since there is always at least one byte free. * This is safe since there is always at least one byte free.
*/ */
p = ctx->in + count;
p = ctx->buffer + count;
*p++ = 0x80; *p++ = 0x80;
/* Bytes of padding needed to make 64 bytes */ /* Bytes of padding needed to make 64 bytes */
@ -133,24 +163,24 @@ MD5Final(unsigned char digest[16], MD5_CTX *ctx)
if (count < 8) { if (count < 8) {
/* Two lots of padding: Pad the first block to 64 bytes */ /* Two lots of padding: Pad the first block to 64 bytes */
memset(p, 0, count); memset(p, 0, count);
htole32n((u_int32_t *)ctx->in, 16);
MD5Transform(ctx->buf, ctx->in);
htole32_16((u_int32_t *)ctx->buffer);
MD5Transform(ctx->state, ctx->buffer);
/* Now fill the next block with 56 bytes */ /* Now fill the next block with 56 bytes */
memset(ctx->in, 0, 56);
memset(ctx->buffer, 0, 56);
} else { } else {
/* Pad block to 56 bytes */ /* Pad block to 56 bytes */
memset(p, 0, count - 8); memset(p, 0, count - 8);
} }
htole32n((u_int32_t *)ctx->in, 14);
htole32_14((u_int32_t *)ctx->buffer);
/* Append length in bits and transform */
((u_int32_t *) ctx->in)[14] = ctx->bits[0];
((u_int32_t *) ctx->in)[15] = ctx->bits[1];
/* Append bit count and transform */
((u_int32_t *)ctx->buffer)[14] = ctx->count & 0xffffffff;
((u_int32_t *)ctx->buffer)[15] = (u_int32_t)(ctx->count >> 32);
MD5Transform(ctx->buf, ctx->in);
htole32n(ctx->buf, 4);
memcpy(digest, ctx->buf, 16);
MD5Transform(ctx->state, ctx->buffer);
htole32_4(ctx->state);
memcpy(digest, ctx->state, MD5_DIGEST_LENGTH);
memset(ctx, 0, sizeof(ctx)); /* In case it's sensitive */ memset(ctx, 0, sizeof(ctx)); /* In case it's sensitive */
} }
@ -173,7 +203,7 @@ MD5Final(unsigned char digest[16], MD5_CTX *ctx)
* the data and converts bytes into longwords for this routine. * the data and converts bytes into longwords for this routine.
*/ */
void void
MD5Transform(u_int32_t buf[4], const unsigned char inc[64])
MD5Transform(u_int32_t buf[4], const unsigned char inc[MD5_BLOCK_LENGTH])
{ {
u_int32_t a, b, c, d; u_int32_t a, b, c, d;
const u_int32_t *in = (const u_int32_t *)inc; const u_int32_t *in = (const u_int32_t *)inc;
@ -183,73 +213,73 @@ MD5Transform(u_int32_t buf[4], const unsigned char inc[64])
c = buf[2]; c = buf[2];
d = buf[3]; 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, 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, c, d, a, b, in[10] + 0xffff5bb1, 17);
MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22); MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12); MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17); MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22); 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, 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, 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, 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, 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[ 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(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, 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, c, d, a, b, in[11] + 0x6d9d6122, 16);
MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23); 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, 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, 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, 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, d, a, b, c, in[12] + 0xe6db99e5, 11);
MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16); MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
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, 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, 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, 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, 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, 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, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
MD5STEP(F4, c, d, a, b, in[6 ] + 0xa3014314, 15);
MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21); MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
MD5STEP(F4, a, b, c, d, in[4 ] + 0xf7537e82, 6);
MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10); 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);
MD5STEP(F4, c, d, a, b, in[2 ] + 0x2ad7d2bb, 15);
MD5STEP(F4, b, c, d, a, in[9 ] + 0xeb86d391, 21);
buf[0] += a; buf[0] += a;
buf[1] += b; buf[1] += b;


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