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368 lines
11 KiB
C
368 lines
11 KiB
C
/*
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* This code implements the MD5 message-digest algorithm.
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* The algorithm is due to Ron Rivest. This code was
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* written by Colin Plumb in 1993, no copyright is claimed.
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* This code is in the public domain; do with it what you wish.
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*
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* Equivalent code is available from RSA Data Security, Inc.
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* This code has been tested against that, and is equivalent,
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* except that you don't need to include two pages of legalese
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* with every copy.
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*
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* To compute the message digest of a chunk of bytes, declare an
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* MD5Context structure, pass it to MD5Init, call MD5Update as
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* needed on buffers full of bytes, and then call MD5Final, which
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* will fill a supplied 16-byte array with the digest.
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*/
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/* This code slightly modified to fit into Samba by
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abartlet@samba.org Jun 2001
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and to fit the cifs vfs by
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Steve French sfrench@us.ibm.com */
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#include <linux/string.h>
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#include "md5.h"
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static void MD5Transform(__u32 buf[4], __u32 const in[16]);
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/*
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* Note: this code is harmless on little-endian machines.
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*/
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static void
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byteReverse(unsigned char *buf, unsigned longs)
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{
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__u32 t;
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do {
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t = (__u32) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
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((unsigned) buf[1] << 8 | buf[0]);
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*(__u32 *) buf = t;
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buf += 4;
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} while (--longs);
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}
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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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*/
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void
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MD5Init(struct MD5Context *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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/*
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* Update context to reflect the concatenation of another buffer full
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* of bytes.
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*/
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void
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MD5Update(struct MD5Context *ctx, unsigned char const *buf, unsigned len)
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{
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register __u32 t;
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/* Update bitcount */
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t = ctx->bits[0];
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if ((ctx->bits[0] = t + ((__u32) 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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unsigned char *p = (unsigned 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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byteReverse(ctx->in, 16);
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MD5Transform(ctx->buf, (__u32 *) 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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byteReverse(ctx->in, 16);
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MD5Transform(ctx->buf, (__u32 *) 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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/*
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* Final wrapup - pad to 64-byte boundary with the bit pattern
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* 1 0* (64-bit count of bits processed, MSB-first)
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*/
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void
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MD5Final(unsigned char digest[16], struct MD5Context *ctx)
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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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byteReverse(ctx->in, 16);
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MD5Transform(ctx->buf, (__u32 *) 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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byteReverse(ctx->in, 14);
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/* Append length in bits and transform */
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((__u32 *) ctx->in)[14] = ctx->bits[0];
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((__u32 *) ctx->in)[15] = ctx->bits[1];
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MD5Transform(ctx->buf, (__u32 *) ctx->in);
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byteReverse((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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/* 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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/*
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* The core of the MD5 algorithm, this alters an existing MD5 hash to
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* reflect the addition of 16 longwords of new data. MD5Update blocks
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* the data and converts bytes into longwords for this routine.
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*/
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static void
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MD5Transform(__u32 buf[4], __u32 const in[16])
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{
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register __u32 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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#if 0 /* currently unused */
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/***********************************************************************
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the rfc 2104 version of hmac_md5 initialisation.
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***********************************************************************/
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static void
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hmac_md5_init_rfc2104(unsigned char *key, int key_len,
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struct HMACMD5Context *ctx)
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{
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int i;
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/* if key is longer than 64 bytes reset it to key=MD5(key) */
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if (key_len > 64) {
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unsigned char tk[16];
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struct MD5Context tctx;
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MD5Init(&tctx);
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MD5Update(&tctx, key, key_len);
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MD5Final(tk, &tctx);
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key = tk;
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key_len = 16;
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}
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/* start out by storing key in pads */
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memset(ctx->k_ipad, 0, sizeof (ctx->k_ipad));
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memset(ctx->k_opad, 0, sizeof (ctx->k_opad));
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memcpy(ctx->k_ipad, key, key_len);
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memcpy(ctx->k_opad, key, key_len);
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/* XOR key with ipad and opad values */
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for (i = 0; i < 64; i++) {
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ctx->k_ipad[i] ^= 0x36;
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ctx->k_opad[i] ^= 0x5c;
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}
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MD5Init(&ctx->ctx);
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MD5Update(&ctx->ctx, ctx->k_ipad, 64);
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}
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#endif
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/***********************************************************************
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the microsoft version of hmac_md5 initialisation.
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***********************************************************************/
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void
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hmac_md5_init_limK_to_64(const unsigned char *key, int key_len,
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struct HMACMD5Context *ctx)
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{
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int i;
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/* if key is longer than 64 bytes truncate it */
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if (key_len > 64) {
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key_len = 64;
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}
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/* start out by storing key in pads */
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memset(ctx->k_ipad, 0, sizeof (ctx->k_ipad));
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memset(ctx->k_opad, 0, sizeof (ctx->k_opad));
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memcpy(ctx->k_ipad, key, key_len);
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memcpy(ctx->k_opad, key, key_len);
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/* XOR key with ipad and opad values */
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for (i = 0; i < 64; i++) {
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ctx->k_ipad[i] ^= 0x36;
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ctx->k_opad[i] ^= 0x5c;
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}
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MD5Init(&ctx->ctx);
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MD5Update(&ctx->ctx, ctx->k_ipad, 64);
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}
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/***********************************************************************
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update hmac_md5 "inner" buffer
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***********************************************************************/
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void
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hmac_md5_update(const unsigned char *text, int text_len,
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struct HMACMD5Context *ctx)
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{
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MD5Update(&ctx->ctx, text, text_len); /* then text of datagram */
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}
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/***********************************************************************
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finish off hmac_md5 "inner" buffer and generate outer one.
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***********************************************************************/
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void
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hmac_md5_final(unsigned char *digest, struct HMACMD5Context *ctx)
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{
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struct MD5Context ctx_o;
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MD5Final(digest, &ctx->ctx);
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MD5Init(&ctx_o);
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MD5Update(&ctx_o, ctx->k_opad, 64);
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MD5Update(&ctx_o, digest, 16);
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MD5Final(digest, &ctx_o);
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}
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/***********************************************************
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single function to calculate an HMAC MD5 digest from data.
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use the microsoft hmacmd5 init method because the key is 16 bytes.
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************************************************************/
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#if 0 /* currently unused */
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static void
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hmac_md5(unsigned char key[16], unsigned char *data, int data_len,
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unsigned char *digest)
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{
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struct HMACMD5Context ctx;
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hmac_md5_init_limK_to_64(key, 16, &ctx);
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if (data_len != 0) {
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hmac_md5_update(data, data_len, &ctx);
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}
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hmac_md5_final(digest, &ctx);
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}
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#endif
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