/*
- * md5.c - Compute MD5 checksum of strings according to the
- * definition of MD5 in RFC 1321 from April 1992.
+ * Copyright (C) 2014 Felix Fietkau <nbd@openwrt.org>
*
- * Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995.
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
*
- * Copyright (C) 1995-1999 Free Software Foundation, Inc.
- * Copyright (C) 2001 Manuel Novoa III
- * Copyright (C) 2003 Glenn L. McGrath
- * Copyright (C) 2003 Erik Andersen
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+/*
+ * This is an OpenSSL-compatible implementation of the RSA Data Security, Inc.
+ * MD5 Message-Digest Algorithm (RFC 1321).
+ *
+ * Homepage:
+ * http://openwall.info/wiki/people/solar/software/public-domain-source-code/md5
+ *
+ * Author:
+ * Alexander Peslyak, better known as Solar Designer <solar at openwall.com>
+ *
+ * This software was written by Alexander Peslyak in 2001. No copyright is
+ * claimed, and the software is hereby placed in the public domain.
+ * In case this attempt to disclaim copyright and place the software in the
+ * public domain is deemed null and void, then the software is
+ * Copyright (c) 2001 Alexander Peslyak and it is hereby released to the
+ * general public under the following terms:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted.
*
- * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
+ * There's ABSOLUTELY NO WARRANTY, express or implied.
+ *
+ * (This is a heavily cut-down "BSD license".)
+ *
+ * This differs from Colin Plumb's older public domain implementation in that
+ * no exactly 32-bit integer data type is required (any 32-bit or wider
+ * unsigned integer data type will do), there's no compile-time endianness
+ * configuration, and the function prototypes match OpenSSL's. No code from
+ * Colin Plumb's implementation has been reused; this comment merely compares
+ * the properties of the two independent implementations.
+ *
+ * The primary goals of this implementation are portability and ease of use.
+ * It is meant to be fast, but not as fast as possible. Some known
+ * optimizations are not included to reduce source code size and avoid
+ * compile-time configuration.
*/
#include <byteswap.h>
+#include <endian.h>
#include <string.h>
#include "md5.h"
+/*
+ * The basic MD5 functions.
+ *
+ * F and G are optimized compared to their RFC 1321 definitions for
+ * architectures that lack an AND-NOT instruction, just like in Colin Plumb's
+ * implementation.
+ */
+#define F(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))
+#define G(x, y, z) ((y) ^ ((z) & ((x) ^ (y))))
+#define H(x, y, z) (((x) ^ (y)) ^ (z))
+#define H2(x, y, z) ((x) ^ ((y) ^ (z)))
+#define I(x, y, z) ((y) ^ ((x) | ~(z)))
+
+/*
+ * The MD5 transformation for all four rounds.
+ */
+#define STEP(f, a, b, c, d, x, t, s) \
+ (a) += f((b), (c), (d)) + (x) + (t); \
+ (a) = (((a) << (s)) | (((a) & 0xffffffff) >> (32 - (s)))); \
+ (a) += (b);
+
+/*
+ * SET reads 4 input bytes in little-endian byte order and stores them
+ * in a properly aligned word in host byte order.
+ */
#if __BYTE_ORDER == __LITTLE_ENDIAN
-#define SWAP_LE32(x) (x)
+#define SET(n) \
+ (*(uint32_t *)&ptr[(n) * 4])
+#define GET(n) \
+ SET(n)
#else
-#define SWAP_LE32(x) bswap_32(x)
+#define SET(n) \
+ (block[(n)] = \
+ (uint32_t)ptr[(n) * 4] | \
+ ((uint32_t)ptr[(n) * 4 + 1] << 8) | \
+ ((uint32_t)ptr[(n) * 4 + 2] << 16) | \
+ ((uint32_t)ptr[(n) * 4 + 3] << 24))
+#define GET(n) \
+ (block[(n)])
#endif
-
-/* Initialize structure containing state of computation.
- * (RFC 1321, 3.3: Step 3)
+/*
+ * This processes one or more 64-byte data blocks, but does NOT update
+ * the bit counters. There are no alignment requirements.
*/
-void md5_begin(md5_ctx_t *ctx)
+static const void *body(md5_ctx_t *ctx, const void *data, unsigned long size)
{
- ctx->A = 0x67452301;
- ctx->B = 0xefcdab89;
- ctx->C = 0x98badcfe;
- ctx->D = 0x10325476;
+ const unsigned char *ptr;
+ uint32_t a, b, c, d;
+ uint32_t saved_a, saved_b, saved_c, saved_d;
+#if __BYTE_ORDER != __LITTLE_ENDIAN
+ uint32_t block[16];
+#endif
- ctx->total = 0;
- ctx->buflen = 0;
+ ptr = (const unsigned char *)data;
+
+ a = ctx->a;
+ b = ctx->b;
+ c = ctx->c;
+ d = ctx->d;
+
+ do {
+ saved_a = a;
+ saved_b = b;
+ saved_c = c;
+ saved_d = d;
+
+/* Round 1 */
+ STEP(F, a, b, c, d, SET(0), 0xd76aa478, 7)
+ STEP(F, d, a, b, c, SET(1), 0xe8c7b756, 12)
+ STEP(F, c, d, a, b, SET(2), 0x242070db, 17)
+ STEP(F, b, c, d, a, SET(3), 0xc1bdceee, 22)
+ STEP(F, a, b, c, d, SET(4), 0xf57c0faf, 7)
+ STEP(F, d, a, b, c, SET(5), 0x4787c62a, 12)
+ STEP(F, c, d, a, b, SET(6), 0xa8304613, 17)
+ STEP(F, b, c, d, a, SET(7), 0xfd469501, 22)
+ STEP(F, a, b, c, d, SET(8), 0x698098d8, 7)
+ STEP(F, d, a, b, c, SET(9), 0x8b44f7af, 12)
+ STEP(F, c, d, a, b, SET(10), 0xffff5bb1, 17)
+ STEP(F, b, c, d, a, SET(11), 0x895cd7be, 22)
+ STEP(F, a, b, c, d, SET(12), 0x6b901122, 7)
+ STEP(F, d, a, b, c, SET(13), 0xfd987193, 12)
+ STEP(F, c, d, a, b, SET(14), 0xa679438e, 17)
+ STEP(F, b, c, d, a, SET(15), 0x49b40821, 22)
+
+/* Round 2 */
+ STEP(G, a, b, c, d, GET(1), 0xf61e2562, 5)
+ STEP(G, d, a, b, c, GET(6), 0xc040b340, 9)
+ STEP(G, c, d, a, b, GET(11), 0x265e5a51, 14)
+ STEP(G, b, c, d, a, GET(0), 0xe9b6c7aa, 20)
+ STEP(G, a, b, c, d, GET(5), 0xd62f105d, 5)
+ STEP(G, d, a, b, c, GET(10), 0x02441453, 9)
+ STEP(G, c, d, a, b, GET(15), 0xd8a1e681, 14)
+ STEP(G, b, c, d, a, GET(4), 0xe7d3fbc8, 20)
+ STEP(G, a, b, c, d, GET(9), 0x21e1cde6, 5)
+ STEP(G, d, a, b, c, GET(14), 0xc33707d6, 9)
+ STEP(G, c, d, a, b, GET(3), 0xf4d50d87, 14)
+ STEP(G, b, c, d, a, GET(8), 0x455a14ed, 20)
+ STEP(G, a, b, c, d, GET(13), 0xa9e3e905, 5)
+ STEP(G, d, a, b, c, GET(2), 0xfcefa3f8, 9)
+ STEP(G, c, d, a, b, GET(7), 0x676f02d9, 14)
+ STEP(G, b, c, d, a, GET(12), 0x8d2a4c8a, 20)
+
+/* Round 3 */
+ STEP(H, a, b, c, d, GET(5), 0xfffa3942, 4)
+ STEP(H2, d, a, b, c, GET(8), 0x8771f681, 11)
+ STEP(H, c, d, a, b, GET(11), 0x6d9d6122, 16)
+ STEP(H2, b, c, d, a, GET(14), 0xfde5380c, 23)
+ STEP(H, a, b, c, d, GET(1), 0xa4beea44, 4)
+ STEP(H2, d, a, b, c, GET(4), 0x4bdecfa9, 11)
+ STEP(H, c, d, a, b, GET(7), 0xf6bb4b60, 16)
+ STEP(H2, b, c, d, a, GET(10), 0xbebfbc70, 23)
+ STEP(H, a, b, c, d, GET(13), 0x289b7ec6, 4)
+ STEP(H2, d, a, b, c, GET(0), 0xeaa127fa, 11)
+ STEP(H, c, d, a, b, GET(3), 0xd4ef3085, 16)
+ STEP(H2, b, c, d, a, GET(6), 0x04881d05, 23)
+ STEP(H, a, b, c, d, GET(9), 0xd9d4d039, 4)
+ STEP(H2, d, a, b, c, GET(12), 0xe6db99e5, 11)
+ STEP(H, c, d, a, b, GET(15), 0x1fa27cf8, 16)
+ STEP(H2, b, c, d, a, GET(2), 0xc4ac5665, 23)
+
+/* Round 4 */
+ STEP(I, a, b, c, d, GET(0), 0xf4292244, 6)
+ STEP(I, d, a, b, c, GET(7), 0x432aff97, 10)
+ STEP(I, c, d, a, b, GET(14), 0xab9423a7, 15)
+ STEP(I, b, c, d, a, GET(5), 0xfc93a039, 21)
+ STEP(I, a, b, c, d, GET(12), 0x655b59c3, 6)
+ STEP(I, d, a, b, c, GET(3), 0x8f0ccc92, 10)
+ STEP(I, c, d, a, b, GET(10), 0xffeff47d, 15)
+ STEP(I, b, c, d, a, GET(1), 0x85845dd1, 21)
+ STEP(I, a, b, c, d, GET(8), 0x6fa87e4f, 6)
+ STEP(I, d, a, b, c, GET(15), 0xfe2ce6e0, 10)
+ STEP(I, c, d, a, b, GET(6), 0xa3014314, 15)
+ STEP(I, b, c, d, a, GET(13), 0x4e0811a1, 21)
+ STEP(I, a, b, c, d, GET(4), 0xf7537e82, 6)
+ STEP(I, d, a, b, c, GET(11), 0xbd3af235, 10)
+ STEP(I, c, d, a, b, GET(2), 0x2ad7d2bb, 15)
+ STEP(I, b, c, d, a, GET(9), 0xeb86d391, 21)
+
+ a += saved_a;
+ b += saved_b;
+ c += saved_c;
+ d += saved_d;
+
+ ptr += 64;
+ } while (size -= 64);
+
+ ctx->a = a;
+ ctx->b = b;
+ ctx->c = c;
+ ctx->d = d;
+
+ return ptr;
}
-/* These are the four functions used in the four steps of the MD5 algorithm
- * and defined in the RFC 1321. The first function is a little bit optimized
- * (as found in Colin Plumbs public domain implementation).
- * #define FF(b, c, d) ((b & c) | (~b & d))
- */
-# 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))
-
-/* Hash a single block, 64 bytes long and 4-byte aligned. */
-static void md5_hash_block(const void *buffer, md5_ctx_t *ctx)
+void md5_begin(md5_ctx_t *ctx)
{
- uint32_t correct_words[16];
- const uint32_t *words = buffer;
-
- static const uint32_t C_array[] = {
- /* round 1 */
- 0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee,
- 0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
- 0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
- 0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821,
- /* round 2 */
- 0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa,
- 0xd62f105d, 0x2441453, 0xd8a1e681, 0xe7d3fbc8,
- 0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed,
- 0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a,
- /* round 3 */
- 0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c,
- 0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
- 0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x4881d05,
- 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
- /* round 4 */
- 0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039,
- 0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1,
- 0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
- 0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391
- };
-
- static const char P_array[] = {
- 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, /* 1 */
- 1, 6, 11, 0, 5, 10, 15, 4, 9, 14, 3, 8, 13, 2, 7, 12, /* 2 */
- 5, 8, 11, 14, 1, 4, 7, 10, 13, 0, 3, 6, 9, 12, 15, 2, /* 3 */
- 0, 7, 14, 5, 12, 3, 10, 1, 8, 15, 6, 13, 4, 11, 2, 9 /* 4 */
- };
-
- static const char S_array[] = {
- 7, 12, 17, 22,
- 5, 9, 14, 20,
- 4, 11, 16, 23,
- 6, 10, 15, 21
- };
-
- uint32_t A = ctx->A;
- uint32_t B = ctx->B;
- uint32_t C = ctx->C;
- uint32_t D = ctx->D;
-
- uint32_t *cwp = correct_words;
-
-# define CYCLIC(w, s) (w = (w << s) | (w >> (32 - s)))
-
- const uint32_t *pc;
- const char *pp;
- const char *ps;
- int i;
- uint32_t temp;
-
- for (i = 0; i < 16; i++) {
- cwp[i] = SWAP_LE32(words[i]);
- }
- //words += 16;
-
- pc = C_array;
- pp = P_array;
- ps = S_array;
-
- for (i = 0; i < 16; i++) {
- temp = A + FF(B, C, D) + cwp[(int) (*pp++)] + *pc++;
- CYCLIC(temp, ps[i & 3]);
- temp += B;
- A = D;
- D = C;
- C = B;
- B = temp;
- }
-
- ps += 4;
- for (i = 0; i < 16; i++) {
- temp = A + FG(B, C, D) + cwp[(int) (*pp++)] + *pc++;
- CYCLIC(temp, ps[i & 3]);
- temp += B;
- A = D;
- D = C;
- C = B;
- B = temp;
- }
- ps += 4;
- for (i = 0; i < 16; i++) {
- temp = A + FH(B, C, D) + cwp[(int) (*pp++)] + *pc++;
- CYCLIC(temp, ps[i & 3]);
- temp += B;
- A = D;
- D = C;
- C = B;
- B = temp;
- }
- ps += 4;
- for (i = 0; i < 16; i++) {
- temp = A + FI(B, C, D) + cwp[(int) (*pp++)] + *pc++;
- CYCLIC(temp, ps[i & 3]);
- temp += B;
- A = D;
- D = C;
- C = B;
- B = temp;
- }
-
+ ctx->a = 0x67452301;
+ ctx->b = 0xefcdab89;
+ ctx->c = 0x98badcfe;
+ ctx->d = 0x10325476;
- ctx->A += A;
- ctx->B += B;
- ctx->C += C;
- ctx->D += D;
+ ctx->lo = 0;
+ ctx->hi = 0;
}
-/* Feed data through a temporary buffer to call md5_hash_aligned_block()
- * with chunks of data that are 4-byte aligned and a multiple of 64 bytes.
- * This function's internal buffer remembers previous data until it has 64
- * bytes worth to pass on. Call md5_end() to flush this buffer. */
-
-void md5_hash(const void *buffer, size_t len, md5_ctx_t *ctx)
+void md5_hash(const void *data, size_t size, md5_ctx_t *ctx)
{
- char *buf = (char *)buffer;
+ uint32_t saved_lo;
+ unsigned long used, available;
- /* RFC 1321 specifies the possible length of the file up to 2^64 bits,
- * Here we only track the number of bytes. */
+ saved_lo = ctx->lo;
+ if ((ctx->lo = (saved_lo + size) & 0x1fffffff) < saved_lo)
+ ctx->hi++;
+ ctx->hi += size >> 29;
- ctx->total += len;
+ used = saved_lo & 0x3f;
- // Process all input.
+ if (used) {
+ available = 64 - used;
- while (len) {
- unsigned i = 64 - ctx->buflen;
-
- // Copy data into aligned buffer.
-
- if (i > len)
- i = len;
- memcpy(ctx->buffer + ctx->buflen, buf, i);
- len -= i;
- ctx->buflen += i;
- buf += i;
+ if (size < available) {
+ memcpy(&ctx->buffer[used], data, size);
+ return;
+ }
- // When buffer fills up, process it.
+ memcpy(&ctx->buffer[used], data, available);
+ data = (const unsigned char *)data + available;
+ size -= available;
+ body(ctx, ctx->buffer, 64);
+ }
- if (ctx->buflen == 64) {
- md5_hash_block(ctx->buffer, ctx);
- ctx->buflen = 0;
- }
+ if (size >= 64) {
+ data = body(ctx, data, size & ~((size_t) 0x3f));
+ size &= 0x3f;
}
+
+ memcpy(ctx->buffer, data, size);
}
-/* Process the remaining bytes in the buffer and put result from CTX
- * in first 16 bytes following RESBUF. The result is always in little
- * endian byte order, so that a byte-wise output yields to the wanted
- * ASCII representation of the message digest.
- *
- * IMPORTANT: On some systems it is required that RESBUF is correctly
- * aligned for a 32 bits value.
- */
void md5_end(void *resbuf, md5_ctx_t *ctx)
{
- char *buf = ctx->buffer;
- int i;
-
- /* Pad data to block size. */
-
- buf[ctx->buflen++] = (char)0x80;
- memset(buf + ctx->buflen, 0, 128 - ctx->buflen);
-
- /* Put the 64-bit file length in *bits* at the end of the buffer. */
- ctx->total <<= 3;
- if (ctx->buflen > 56)
- buf += 64;
-
- for (i = 0; i < 8; i++)
- buf[56 + i] = ctx->total >> (i*8);
-
- /* Process last bytes. */
- if (buf != ctx->buffer)
- md5_hash_block(ctx->buffer, ctx);
- md5_hash_block(buf, ctx);
-
- /* Put result from CTX in first 16 bytes following RESBUF. The result is
- * always in little endian byte order, so that a byte-wise output yields
- * to the wanted ASCII representation of the message digest.
- *
- * IMPORTANT: On some systems it is required that RESBUF is correctly
- * aligned for a 32 bits value.
- */
- ((uint32_t *) resbuf)[0] = SWAP_LE32(ctx->A);
- ((uint32_t *) resbuf)[1] = SWAP_LE32(ctx->B);
- ((uint32_t *) resbuf)[2] = SWAP_LE32(ctx->C);
- ((uint32_t *) resbuf)[3] = SWAP_LE32(ctx->D);
+ unsigned char *result = resbuf;
+ unsigned long used, available;
+
+ used = ctx->lo & 0x3f;
+
+ ctx->buffer[used++] = 0x80;
+
+ available = 64 - used;
+
+ if (available < 8) {
+ memset(&ctx->buffer[used], 0, available);
+ body(ctx, ctx->buffer, 64);
+ used = 0;
+ available = 64;
+ }
+
+ memset(&ctx->buffer[used], 0, available - 8);
+
+ ctx->lo <<= 3;
+ ctx->buffer[56] = ctx->lo;
+ ctx->buffer[57] = ctx->lo >> 8;
+ ctx->buffer[58] = ctx->lo >> 16;
+ ctx->buffer[59] = ctx->lo >> 24;
+ ctx->buffer[60] = ctx->hi;
+ ctx->buffer[61] = ctx->hi >> 8;
+ ctx->buffer[62] = ctx->hi >> 16;
+ ctx->buffer[63] = ctx->hi >> 24;
+
+ body(ctx, ctx->buffer, 64);
+
+ result[0] = ctx->a;
+ result[1] = ctx->a >> 8;
+ result[2] = ctx->a >> 16;
+ result[3] = ctx->a >> 24;
+ result[4] = ctx->b;
+ result[5] = ctx->b >> 8;
+ result[6] = ctx->b >> 16;
+ result[7] = ctx->b >> 24;
+ result[8] = ctx->c;
+ result[9] = ctx->c >> 8;
+ result[10] = ctx->c >> 16;
+ result[11] = ctx->c >> 24;
+ result[12] = ctx->d;
+ result[13] = ctx->d >> 8;
+ result[14] = ctx->d >> 16;
+ result[15] = ctx->d >> 24;
+
+ memset(ctx, 0, sizeof(*ctx));
}
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