#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <sys/types.h>
#if STDC_HEADERS || defined _LIBC
# include <stdlib.h>
# include <string.h>
#else
# ifndef HAVE_MEMCPY
# define memcpy(d, s, n) bcopy ((s), (d), (n))
# endif
#endif
#include "ansidecl.h"
#include "md5.h"
#ifdef _LIBC
# include <endian.h>
# if __BYTE_ORDER == __BIG_ENDIAN
# define WORDS_BIGENDIAN 1
# endif
#endif
#ifdef WORDS_BIGENDIAN
# define SWAP(n) \
(((n) << 24) | (((n) & 0xff00) << 8) | (((n) >> 8) & 0xff00) | ((n) >> 24))
#else
# define SWAP(n) (n)
#endif
static const unsigned char fillbuf[64] = { 0x80, 0 };
void
md5_init_ctx (ctx)
struct md5_ctx *ctx;
{
ctx->A = (md5_uint32) 0x67452301;
ctx->B = (md5_uint32) 0xefcdab89;
ctx->C = (md5_uint32) 0x98badcfe;
ctx->D = (md5_uint32) 0x10325476;
ctx->total[0] = ctx->total[1] = 0;
ctx->buflen = 0;
}
void *
md5_read_ctx (ctx, resbuf)
const struct md5_ctx *ctx;
void *resbuf;
{
((md5_uint32 *) resbuf)[0] = SWAP (ctx->A);
((md5_uint32 *) resbuf)[1] = SWAP (ctx->B);
((md5_uint32 *) resbuf)[2] = SWAP (ctx->C);
((md5_uint32 *) resbuf)[3] = SWAP (ctx->D);
return resbuf;
}
void *
md5_finish_ctx (ctx, resbuf)
struct md5_ctx *ctx;
void *resbuf;
{
md5_uint32 bytes = ctx->buflen;
size_t pad;
ctx->total[0] += bytes;
if (ctx->total[0] < bytes)
++ctx->total[1];
pad = bytes >= 56 ? 64 + 56 - bytes : 56 - bytes;
memcpy (&ctx->buffer[bytes], fillbuf, pad);
*(md5_uint32 *) &ctx->buffer[bytes + pad] = SWAP (ctx->total[0] << 3);
*(md5_uint32 *) &ctx->buffer[bytes + pad + 4] = SWAP ((ctx->total[1] << 3) |
(ctx->total[0] >> 29));
md5_process_block (ctx->buffer, bytes + pad + 8, ctx);
return md5_read_ctx (ctx, resbuf);
}
int
md5_stream (stream, resblock)
FILE *stream;
void *resblock;
{
#define BLOCKSIZE 4096
struct md5_ctx ctx;
char buffer[BLOCKSIZE + 72];
size_t sum;
md5_init_ctx (&ctx);
while (1)
{
size_t n;
sum = 0;
do
{
n = fread (buffer + sum, 1, BLOCKSIZE - sum, stream);
sum += n;
}
while (sum < BLOCKSIZE && n != 0);
if (n == 0 && ferror (stream))
return 1;
if (n == 0)
break;
md5_process_block (buffer, BLOCKSIZE, &ctx);
}
if (sum > 0)
md5_process_bytes (buffer, sum, &ctx);
md5_finish_ctx (&ctx, resblock);
return 0;
}
void *
md5_buffer (buffer, len, resblock)
const char *buffer;
size_t len;
void *resblock;
{
struct md5_ctx ctx;
md5_init_ctx (&ctx);
md5_process_bytes (buffer, len, &ctx);
return md5_finish_ctx (&ctx, resblock);
}
void
md5_process_bytes (buffer, len, ctx)
const void *buffer;
size_t len;
struct md5_ctx *ctx;
{
if (ctx->buflen != 0)
{
size_t left_over = ctx->buflen;
size_t add = 128 - left_over > len ? len : 128 - left_over;
memcpy (&ctx->buffer[left_over], buffer, add);
ctx->buflen += add;
if (left_over + add > 64)
{
md5_process_block (ctx->buffer, (left_over + add) & ~63, ctx);
memcpy (ctx->buffer, &ctx->buffer[(left_over + add) & ~63],
(left_over + add) & 63);
ctx->buflen = (left_over + add) & 63;
}
buffer = (const void *) ((const char *) buffer + add);
len -= add;
}
if (len > 64)
{
md5_process_block (buffer, len & ~63, ctx);
buffer = (const void *) ((const char *) buffer + (len & ~63));
len &= 63;
}
if (len > 0)
{
memcpy (ctx->buffer, buffer, len);
ctx->buflen = len;
}
}
#define FF(b, c, d) (d ^ (b & (c ^ d)))
#define FG(b, c, d) FF (d, b, c)
#define FH(b, c, d) (b ^ c ^ d)
#define FI(b, c, d) (c ^ (b | ~d))
void
md5_process_block (buffer, len, ctx)
const void *buffer;
size_t len;
struct md5_ctx *ctx;
{
md5_uint32 correct_words[16];
const md5_uint32 *words = (const md5_uint32 *) buffer;
size_t nwords = len / sizeof (md5_uint32);
const md5_uint32 *endp = words + nwords;
md5_uint32 A = ctx->A;
md5_uint32 B = ctx->B;
md5_uint32 C = ctx->C;
md5_uint32 D = ctx->D;
ctx->total[0] += len;
if (ctx->total[0] < len)
++ctx->total[1];
while (words < endp)
{
md5_uint32 *cwp = correct_words;
md5_uint32 A_save = A;
md5_uint32 B_save = B;
md5_uint32 C_save = C;
md5_uint32 D_save = D;
#define OP(a, b, c, d, s, T) \
do \
{ \
a += FF (b, c, d) + (*cwp++ = SWAP (*words)) + T; \
++words; \
CYCLIC (a, s); \
a += b; \
} \
while (0)
#define CYCLIC(w, s) (w = (w << s) | (w >> (32 - s)))
OP (A, B, C, D, 7, (md5_uint32) 0xd76aa478);
OP (D, A, B, C, 12, (md5_uint32) 0xe8c7b756);
OP (C, D, A, B, 17, (md5_uint32) 0x242070db);
OP (B, C, D, A, 22, (md5_uint32) 0xc1bdceee);
OP (A, B, C, D, 7, (md5_uint32) 0xf57c0faf);
OP (D, A, B, C, 12, (md5_uint32) 0x4787c62a);
OP (C, D, A, B, 17, (md5_uint32) 0xa8304613);
OP (B, C, D, A, 22, (md5_uint32) 0xfd469501);
OP (A, B, C, D, 7, (md5_uint32) 0x698098d8);
OP (D, A, B, C, 12, (md5_uint32) 0x8b44f7af);
OP (C, D, A, B, 17, (md5_uint32) 0xffff5bb1);
OP (B, C, D, A, 22, (md5_uint32) 0x895cd7be);
OP (A, B, C, D, 7, (md5_uint32) 0x6b901122);
OP (D, A, B, C, 12, (md5_uint32) 0xfd987193);
OP (C, D, A, B, 17, (md5_uint32) 0xa679438e);
OP (B, C, D, A, 22, (md5_uint32) 0x49b40821);
#undef OP
#define OP(a, b, c, d, k, s, T) \
do \
{ \
a += FX (b, c, d) + correct_words[k] + T; \
CYCLIC (a, s); \
a += b; \
} \
while (0)
#define FX(b, c, d) FG (b, c, d)
OP (A, B, C, D, 1, 5, (md5_uint32) 0xf61e2562);
OP (D, A, B, C, 6, 9, (md5_uint32) 0xc040b340);
OP (C, D, A, B, 11, 14, (md5_uint32) 0x265e5a51);
OP (B, C, D, A, 0, 20, (md5_uint32) 0xe9b6c7aa);
OP (A, B, C, D, 5, 5, (md5_uint32) 0xd62f105d);
OP (D, A, B, C, 10, 9, (md5_uint32) 0x02441453);
OP (C, D, A, B, 15, 14, (md5_uint32) 0xd8a1e681);
OP (B, C, D, A, 4, 20, (md5_uint32) 0xe7d3fbc8);
OP (A, B, C, D, 9, 5, (md5_uint32) 0x21e1cde6);
OP (D, A, B, C, 14, 9, (md5_uint32) 0xc33707d6);
OP (C, D, A, B, 3, 14, (md5_uint32) 0xf4d50d87);
OP (B, C, D, A, 8, 20, (md5_uint32) 0x455a14ed);
OP (A, B, C, D, 13, 5, (md5_uint32) 0xa9e3e905);
OP (D, A, B, C, 2, 9, (md5_uint32) 0xfcefa3f8);
OP (C, D, A, B, 7, 14, (md5_uint32) 0x676f02d9);
OP (B, C, D, A, 12, 20, (md5_uint32) 0x8d2a4c8a);
#undef FX
#define FX(b, c, d) FH (b, c, d)
OP (A, B, C, D, 5, 4, (md5_uint32) 0xfffa3942);
OP (D, A, B, C, 8, 11, (md5_uint32) 0x8771f681);
OP (C, D, A, B, 11, 16, (md5_uint32) 0x6d9d6122);
OP (B, C, D, A, 14, 23, (md5_uint32) 0xfde5380c);
OP (A, B, C, D, 1, 4, (md5_uint32) 0xa4beea44);
OP (D, A, B, C, 4, 11, (md5_uint32) 0x4bdecfa9);
OP (C, D, A, B, 7, 16, (md5_uint32) 0xf6bb4b60);
OP (B, C, D, A, 10, 23, (md5_uint32) 0xbebfbc70);
OP (A, B, C, D, 13, 4, (md5_uint32) 0x289b7ec6);
OP (D, A, B, C, 0, 11, (md5_uint32) 0xeaa127fa);
OP (C, D, A, B, 3, 16, (md5_uint32) 0xd4ef3085);
OP (B, C, D, A, 6, 23, (md5_uint32) 0x04881d05);
OP (A, B, C, D, 9, 4, (md5_uint32) 0xd9d4d039);
OP (D, A, B, C, 12, 11, (md5_uint32) 0xe6db99e5);
OP (C, D, A, B, 15, 16, (md5_uint32) 0x1fa27cf8);
OP (B, C, D, A, 2, 23, (md5_uint32) 0xc4ac5665);
#undef FX
#define FX(b, c, d) FI (b, c, d)
OP (A, B, C, D, 0, 6, (md5_uint32) 0xf4292244);
OP (D, A, B, C, 7, 10, (md5_uint32) 0x432aff97);
OP (C, D, A, B, 14, 15, (md5_uint32) 0xab9423a7);
OP (B, C, D, A, 5, 21, (md5_uint32) 0xfc93a039);
OP (A, B, C, D, 12, 6, (md5_uint32) 0x655b59c3);
OP (D, A, B, C, 3, 10, (md5_uint32) 0x8f0ccc92);
OP (C, D, A, B, 10, 15, (md5_uint32) 0xffeff47d);
OP (B, C, D, A, 1, 21, (md5_uint32) 0x85845dd1);
OP (A, B, C, D, 8, 6, (md5_uint32) 0x6fa87e4f);
OP (D, A, B, C, 15, 10, (md5_uint32) 0xfe2ce6e0);
OP (C, D, A, B, 6, 15, (md5_uint32) 0xa3014314);
OP (B, C, D, A, 13, 21, (md5_uint32) 0x4e0811a1);
OP (A, B, C, D, 4, 6, (md5_uint32) 0xf7537e82);
OP (D, A, B, C, 11, 10, (md5_uint32) 0xbd3af235);
OP (C, D, A, B, 2, 15, (md5_uint32) 0x2ad7d2bb);
OP (B, C, D, A, 9, 21, (md5_uint32) 0xeb86d391);
A += A_save;
B += B_save;
C += C_save;
D += D_save;
}
ctx->A = A;
ctx->B = B;
ctx->C = C;
ctx->D = D;
}