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270 lines
8.0 KiB
C
270 lines
8.0 KiB
C
/** MD5 implementation (RFC 1321)
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* @file
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*
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* This code implements the MD5 message-digest algorithm. The algorithm is due
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* to Ron Rivest.
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*
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* This code was written by Colin Plumb in 1993, no copyright is claimed. This
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* code is in the public domain; do with it what you wish.
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*
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* This code was slightly modified to fit into Samba by abartlet@samba.org Jun
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* 2001 and to fit the cifs vfs by Steve French sfrench@us.ibm.com. Grabbed from
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* linux-2.6.9 one November afternoon 2004 and ELinksified' by jonas.
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*
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* Equivalent code is available from RSA Data Security, Inc. This code has been
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* tested against that, and is equivalent, except that you don't need to include
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* two pages of legalese with every copy. */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <string.h>
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#include "elinks.h"
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#include "util/md5.h"
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static void transform_md5(uint32_t buf[4], uint32_t const in[16]);
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/** Swap the bytes of each uint32_t, if necessary.
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* This code is harmless on little-endian machines.
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* @todo FIXME: Optimize it away on little-endian machines. */
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static void
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reverse_md5_bytes(unsigned char *buf, unsigned int longs)
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{
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uint32_t t;
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do {
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t = (uint32_t) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
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((unsigned) buf[1] << 8 | buf[0]);
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*(uint32_t *) buf = t;
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buf += 4;
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} while (--longs);
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}
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/** Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
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* initialization constants.
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* @relates md5_context */
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void
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init_md5(struct md5_context *ctx)
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{
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ctx->buf[0] = 0x67452301;
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ctx->buf[1] = 0xefcdab89;
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ctx->buf[2] = 0x98badcfe;
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ctx->buf[3] = 0x10325476;
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ctx->bits[0] = 0;
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ctx->bits[1] = 0;
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}
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/** Update context to reflect the concatenation of another buffer full
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* of bytes.
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* @relates md5_context */
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void
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update_md5(struct md5_context *ctx, const char *buf, unsigned long len)
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{
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uint32_t t;
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/* Update bitcount */
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t = ctx->bits[0];
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if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t)
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ctx->bits[1]++; /* Carry from low to high */
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ctx->bits[1] += len >> 29;
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t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */
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/* Handle any leading odd-sized chunks */
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if (t) {
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char *p = (char *) ctx->in + t;
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t = 64 - t;
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if (len < t) {
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memmove(p, buf, len);
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return;
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}
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memmove(p, buf, t);
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reverse_md5_bytes(ctx->in, 16);
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transform_md5(ctx->buf, (uint32_t *) ctx->in);
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buf += t;
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len -= t;
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}
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/* Process data in 64-byte chunks */
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while (len >= 64) {
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memmove(ctx->in, buf, 64);
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reverse_md5_bytes(ctx->in, 16);
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transform_md5(ctx->buf, (uint32_t *) ctx->in);
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buf += 64;
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len -= 64;
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}
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/* Handle any remaining bytes of data. */
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memmove(ctx->in, buf, len);
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}
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/** Final wrapup - pad to 64-byte boundary with the bit pattern 1 0* (64-bit
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* count of bits processed, MSB-first)
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* @relates md5_context */
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void
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done_md5(struct md5_context *ctx, md5_digest_bin_T digest)
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{
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unsigned int count;
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unsigned char *p;
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/* Compute number of bytes mod 64 */
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count = (ctx->bits[0] >> 3) & 0x3F;
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/* Set the first char of padding to 0x80. This is safe since there is
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always at least one byte free */
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p = ctx->in + count;
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*p++ = 0x80;
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/* Bytes of padding needed to make 64 bytes */
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count = 64 - 1 - count;
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/* Pad out to 56 mod 64 */
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if (count < 8) {
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/* Two lots of padding: Pad the first block to 64 bytes */
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memset(p, 0, count);
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reverse_md5_bytes(ctx->in, 16);
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transform_md5(ctx->buf, (uint32_t *) ctx->in);
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/* Now fill the next block with 56 bytes */
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memset(ctx->in, 0, 56);
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} else {
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/* Pad block to 56 bytes */
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memset(p, 0, count - 8);
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}
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reverse_md5_bytes(ctx->in, 14);
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/* Append length in bits and transform */
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((uint32_t *) ctx->in)[14] = ctx->bits[0];
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((uint32_t *) ctx->in)[15] = ctx->bits[1];
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transform_md5(ctx->buf, (uint32_t *) ctx->in);
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reverse_md5_bytes((unsigned char *)ctx->buf, 4);
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memmove(digest, ctx->buf, 16);
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memset(ctx, 0, sizeof(*ctx)); /* In case it's sensitive */
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}
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unsigned char *
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digest_md5(const char *data, unsigned long length,
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md5_digest_bin_T digest)
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{
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struct md5_context ctx;
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init_md5(&ctx);
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if (length != 0)
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update_md5(&ctx, data, length);
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done_md5(&ctx, digest);
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return digest;
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}
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/* The four core functions - F1 is optimized somewhat */
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/* #define F1(x, y, z) (x & y | ~x & z) */
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#define F1(x, y, z) (z ^ (x & (y ^ z)))
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#define F2(x, y, z) F1(z, x, y)
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#define F3(x, y, z) (x ^ y ^ z)
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#define F4(x, y, z) (y ^ (x | ~z))
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/** This is the central step in the MD5 algorithm. */
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#define MD5STEP(f, w, x, y, z, data, s) \
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( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
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/** The core of the MD5 algorithm, this alters an existing MD5 hash to reflect
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* the addition of 16 longwords of new data. md5_update() blocks the data and
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* converts bytes into longwords for this routine. */
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static void
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transform_md5(uint32_t buf[4], uint32_t const in[16])
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{
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uint32_t a, b, c, d;
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a = buf[0];
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b = buf[1];
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c = buf[2];
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d = buf[3];
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MD5STEP(F1, a, b, c, d, in[ 0] + 0xd76aa478, 7);
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MD5STEP(F1, d, a, b, c, in[ 1] + 0xe8c7b756, 12);
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MD5STEP(F1, c, d, a, b, in[ 2] + 0x242070db, 17);
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MD5STEP(F1, b, c, d, a, in[ 3] + 0xc1bdceee, 22);
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MD5STEP(F1, a, b, c, d, in[ 4] + 0xf57c0faf, 7);
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MD5STEP(F1, d, a, b, c, in[ 5] + 0x4787c62a, 12);
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MD5STEP(F1, c, d, a, b, in[ 6] + 0xa8304613, 17);
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MD5STEP(F1, b, c, d, a, in[ 7] + 0xfd469501, 22);
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MD5STEP(F1, a, b, c, d, in[ 8] + 0x698098d8, 7);
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MD5STEP(F1, d, a, b, c, in[ 9] + 0x8b44f7af, 12);
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MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
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MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
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MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
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MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
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MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
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MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
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MD5STEP(F2, a, b, c, d, in[ 1] + 0xf61e2562, 5);
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MD5STEP(F2, d, a, b, c, in[ 6] + 0xc040b340, 9);
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MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
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MD5STEP(F2, b, c, d, a, in[ 0] + 0xe9b6c7aa, 20);
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MD5STEP(F2, a, b, c, d, in[ 5] + 0xd62f105d, 5);
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MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
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MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
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MD5STEP(F2, b, c, d, a, in[ 4] + 0xe7d3fbc8, 20);
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MD5STEP(F2, a, b, c, d, in[ 9] + 0x21e1cde6, 5);
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MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
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MD5STEP(F2, c, d, a, b, in[ 3] + 0xf4d50d87, 14);
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MD5STEP(F2, b, c, d, a, in[ 8] + 0x455a14ed, 20);
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MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
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MD5STEP(F2, d, a, b, c, in[ 2] + 0xfcefa3f8, 9);
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MD5STEP(F2, c, d, a, b, in[ 7] + 0x676f02d9, 14);
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MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
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MD5STEP(F3, a, b, c, d, in[ 5] + 0xfffa3942, 4);
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MD5STEP(F3, d, a, b, c, in[ 8] + 0x8771f681, 11);
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MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
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MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
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MD5STEP(F3, a, b, c, d, in[ 1] + 0xa4beea44, 4);
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MD5STEP(F3, d, a, b, c, in[ 4] + 0x4bdecfa9, 11);
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MD5STEP(F3, c, d, a, b, in[ 7] + 0xf6bb4b60, 16);
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MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
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MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
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MD5STEP(F3, d, a, b, c, in[ 0] + 0xeaa127fa, 11);
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MD5STEP(F3, c, d, a, b, in[ 3] + 0xd4ef3085, 16);
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MD5STEP(F3, b, c, d, a, in[ 6] + 0x04881d05, 23);
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MD5STEP(F3, a, b, c, d, in[ 9] + 0xd9d4d039, 4);
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MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
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MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
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MD5STEP(F3, b, c, d, a, in[ 2] + 0xc4ac5665, 23);
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MD5STEP(F4, a, b, c, d, in[ 0] + 0xf4292244, 6);
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MD5STEP(F4, d, a, b, c, in[ 7] + 0x432aff97, 10);
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MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
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MD5STEP(F4, b, c, d, a, in[ 5] + 0xfc93a039, 21);
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MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
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MD5STEP(F4, d, a, b, c, in[ 3] + 0x8f0ccc92, 10);
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MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
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MD5STEP(F4, b, c, d, a, in[ 1] + 0x85845dd1, 21);
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MD5STEP(F4, a, b, c, d, in[ 8] + 0x6fa87e4f, 6);
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MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
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MD5STEP(F4, c, d, a, b, in[ 6] + 0xa3014314, 15);
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MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
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MD5STEP(F4, a, b, c, d, in[ 4] + 0xf7537e82, 6);
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MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
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MD5STEP(F4, c, d, a, b, in[ 2] + 0x2ad7d2bb, 15);
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MD5STEP(F4, b, c, d, a, in[ 9] + 0xeb86d391, 21);
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buf[0] += a;
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buf[1] += b;
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buf[2] += c;
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buf[3] += d;
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}
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