meillo@162: /*
meillo@162:  * This is an OpenSSL-compatible implementation of the RSA Data Security,
meillo@162:  * Inc. MD5 Message-Digest Algorithm (RFC 1321).
meillo@162:  *
meillo@162:  * Written by Solar Designer <solar at openwall.com> in 2001, and placed
meillo@162:  * in the public domain.  There's absolutely no warranty.
meillo@162:  *
meillo@162:  * This differs from Colin Plumb's older public domain implementation in
meillo@162:  * that no 32-bit integer data type is required, there's no compile-time
meillo@162:  * endianness configuration, and the function prototypes match OpenSSL's.
meillo@162:  * The primary goals are portability and ease of use.
meillo@162:  *
meillo@162:  * This implementation is meant to be fast, but not as fast as possible.
meillo@162:  * Some known optimizations are not included to reduce source code size
meillo@162:  * and avoid compile-time configuration.
meillo@162:  */
meillo@162: 
meillo@162: #ifndef HAVE_OPENSSL
meillo@162: 
meillo@162: #include <string.h>
meillo@162: 
meillo@162: #include "md5.h"
meillo@162: 
meillo@162: /*
meillo@162:  * The basic MD5 functions.
meillo@162:  *
meillo@162:  * F and G are optimized compared to their RFC 1321 definitions for
meillo@162:  * architectures that lack an AND-NOT instruction, just like in Colin Plumb's
meillo@162:  * implementation.
meillo@162:  */
meillo@162: #define F(x, y, z)			((z) ^ ((x) & ((y) ^ (z))))
meillo@162: #define G(x, y, z)			((y) ^ ((z) & ((x) ^ (y))))
meillo@162: #define H(x, y, z)			((x) ^ (y) ^ (z))
meillo@162: #define I(x, y, z)			((y) ^ ((x) | ~(z)))
meillo@162: 
meillo@162: /*
meillo@162:  * The MD5 transformation for all four rounds.
meillo@162:  */
meillo@162: #define STEP(f, a, b, c, d, x, t, s) \
meillo@162: 	(a) += f((b), (c), (d)) + (x) + (t); \
meillo@162: 	(a) = (((a) << (s)) | (((a) & 0xffffffff) >> (32 - (s)))); \
meillo@162: 	(a) += (b);
meillo@162: 
meillo@162: /*
meillo@162:  * SET reads 4 input bytes in little-endian byte order and stores them
meillo@162:  * in a properly aligned word in host byte order.
meillo@162:  *
meillo@162:  * The check for little-endian architectures that tolerate unaligned
meillo@162:  * memory accesses is just an optimization.  Nothing will break if it
meillo@162:  * doesn't work.
meillo@162:  */
meillo@162: #if defined(__i386__) || defined(__x86_64__) || defined(__vax__)
meillo@162: #define SET(n) \
meillo@162: 	(*(MD5_u32plus *)&ptr[(n) * 4])
meillo@162: #define GET(n) \
meillo@162: 	SET(n)
meillo@162: #else
meillo@162: #define SET(n) \
meillo@162: 	(ctx->block[(n)] = \
meillo@162: 	(MD5_u32plus)ptr[(n) * 4] | \
meillo@162: 	((MD5_u32plus)ptr[(n) * 4 + 1] << 8) | \
meillo@162: 	((MD5_u32plus)ptr[(n) * 4 + 2] << 16) | \
meillo@162: 	((MD5_u32plus)ptr[(n) * 4 + 3] << 24))
meillo@162: #define GET(n) \
meillo@162: 	(ctx->block[(n)])
meillo@162: #endif
meillo@162: 
meillo@162: /*
meillo@162:  * This processes one or more 64-byte data blocks, but does NOT update
meillo@162:  * the bit counters.  There are no alignment requirements.
meillo@162:  */
meillo@162: static void *body(MD5_CTX *ctx, void *data, unsigned long size)
meillo@162: {
meillo@162: 	unsigned char *ptr;
meillo@162: 	MD5_u32plus a, b, c, d;
meillo@162: 	MD5_u32plus saved_a, saved_b, saved_c, saved_d;
meillo@162: 
meillo@162: 	ptr = data;
meillo@162: 
meillo@162: 	a = ctx->a;
meillo@162: 	b = ctx->b;
meillo@162: 	c = ctx->c;
meillo@162: 	d = ctx->d;
meillo@162: 
meillo@162: 	do {
meillo@162: 		saved_a = a;
meillo@162: 		saved_b = b;
meillo@162: 		saved_c = c;
meillo@162: 		saved_d = d;
meillo@162: 
meillo@162: /* Round 1 */
meillo@162: 		STEP(F, a, b, c, d, SET(0), 0xd76aa478, 7)
meillo@162: 		STEP(F, d, a, b, c, SET(1), 0xe8c7b756, 12)
meillo@162: 		STEP(F, c, d, a, b, SET(2), 0x242070db, 17)
meillo@162: 		STEP(F, b, c, d, a, SET(3), 0xc1bdceee, 22)
meillo@162: 		STEP(F, a, b, c, d, SET(4), 0xf57c0faf, 7)
meillo@162: 		STEP(F, d, a, b, c, SET(5), 0x4787c62a, 12)
meillo@162: 		STEP(F, c, d, a, b, SET(6), 0xa8304613, 17)
meillo@162: 		STEP(F, b, c, d, a, SET(7), 0xfd469501, 22)
meillo@162: 		STEP(F, a, b, c, d, SET(8), 0x698098d8, 7)
meillo@162: 		STEP(F, d, a, b, c, SET(9), 0x8b44f7af, 12)
meillo@162: 		STEP(F, c, d, a, b, SET(10), 0xffff5bb1, 17)
meillo@162: 		STEP(F, b, c, d, a, SET(11), 0x895cd7be, 22)
meillo@162: 		STEP(F, a, b, c, d, SET(12), 0x6b901122, 7)
meillo@162: 		STEP(F, d, a, b, c, SET(13), 0xfd987193, 12)
meillo@162: 		STEP(F, c, d, a, b, SET(14), 0xa679438e, 17)
meillo@162: 		STEP(F, b, c, d, a, SET(15), 0x49b40821, 22)
meillo@162: 
meillo@162: /* Round 2 */
meillo@162: 		STEP(G, a, b, c, d, GET(1), 0xf61e2562, 5)
meillo@162: 		STEP(G, d, a, b, c, GET(6), 0xc040b340, 9)
meillo@162: 		STEP(G, c, d, a, b, GET(11), 0x265e5a51, 14)
meillo@162: 		STEP(G, b, c, d, a, GET(0), 0xe9b6c7aa, 20)
meillo@162: 		STEP(G, a, b, c, d, GET(5), 0xd62f105d, 5)
meillo@162: 		STEP(G, d, a, b, c, GET(10), 0x02441453, 9)
meillo@162: 		STEP(G, c, d, a, b, GET(15), 0xd8a1e681, 14)
meillo@162: 		STEP(G, b, c, d, a, GET(4), 0xe7d3fbc8, 20)
meillo@162: 		STEP(G, a, b, c, d, GET(9), 0x21e1cde6, 5)
meillo@162: 		STEP(G, d, a, b, c, GET(14), 0xc33707d6, 9)
meillo@162: 		STEP(G, c, d, a, b, GET(3), 0xf4d50d87, 14)
meillo@162: 		STEP(G, b, c, d, a, GET(8), 0x455a14ed, 20)
meillo@162: 		STEP(G, a, b, c, d, GET(13), 0xa9e3e905, 5)
meillo@162: 		STEP(G, d, a, b, c, GET(2), 0xfcefa3f8, 9)
meillo@162: 		STEP(G, c, d, a, b, GET(7), 0x676f02d9, 14)
meillo@162: 		STEP(G, b, c, d, a, GET(12), 0x8d2a4c8a, 20)
meillo@162: 
meillo@162: /* Round 3 */
meillo@162: 		STEP(H, a, b, c, d, GET(5), 0xfffa3942, 4)
meillo@162: 		STEP(H, d, a, b, c, GET(8), 0x8771f681, 11)
meillo@162: 		STEP(H, c, d, a, b, GET(11), 0x6d9d6122, 16)
meillo@162: 		STEP(H, b, c, d, a, GET(14), 0xfde5380c, 23)
meillo@162: 		STEP(H, a, b, c, d, GET(1), 0xa4beea44, 4)
meillo@162: 		STEP(H, d, a, b, c, GET(4), 0x4bdecfa9, 11)
meillo@162: 		STEP(H, c, d, a, b, GET(7), 0xf6bb4b60, 16)
meillo@162: 		STEP(H, b, c, d, a, GET(10), 0xbebfbc70, 23)
meillo@162: 		STEP(H, a, b, c, d, GET(13), 0x289b7ec6, 4)
meillo@162: 		STEP(H, d, a, b, c, GET(0), 0xeaa127fa, 11)
meillo@162: 		STEP(H, c, d, a, b, GET(3), 0xd4ef3085, 16)
meillo@162: 		STEP(H, b, c, d, a, GET(6), 0x04881d05, 23)
meillo@162: 		STEP(H, a, b, c, d, GET(9), 0xd9d4d039, 4)
meillo@162: 		STEP(H, d, a, b, c, GET(12), 0xe6db99e5, 11)
meillo@162: 		STEP(H, c, d, a, b, GET(15), 0x1fa27cf8, 16)
meillo@162: 		STEP(H, b, c, d, a, GET(2), 0xc4ac5665, 23)
meillo@162: 
meillo@162: /* Round 4 */
meillo@162: 		STEP(I, a, b, c, d, GET(0), 0xf4292244, 6)
meillo@162: 		STEP(I, d, a, b, c, GET(7), 0x432aff97, 10)
meillo@162: 		STEP(I, c, d, a, b, GET(14), 0xab9423a7, 15)
meillo@162: 		STEP(I, b, c, d, a, GET(5), 0xfc93a039, 21)
meillo@162: 		STEP(I, a, b, c, d, GET(12), 0x655b59c3, 6)
meillo@162: 		STEP(I, d, a, b, c, GET(3), 0x8f0ccc92, 10)
meillo@162: 		STEP(I, c, d, a, b, GET(10), 0xffeff47d, 15)
meillo@162: 		STEP(I, b, c, d, a, GET(1), 0x85845dd1, 21)
meillo@162: 		STEP(I, a, b, c, d, GET(8), 0x6fa87e4f, 6)
meillo@162: 		STEP(I, d, a, b, c, GET(15), 0xfe2ce6e0, 10)
meillo@162: 		STEP(I, c, d, a, b, GET(6), 0xa3014314, 15)
meillo@162: 		STEP(I, b, c, d, a, GET(13), 0x4e0811a1, 21)
meillo@162: 		STEP(I, a, b, c, d, GET(4), 0xf7537e82, 6)
meillo@162: 		STEP(I, d, a, b, c, GET(11), 0xbd3af235, 10)
meillo@162: 		STEP(I, c, d, a, b, GET(2), 0x2ad7d2bb, 15)
meillo@162: 		STEP(I, b, c, d, a, GET(9), 0xeb86d391, 21)
meillo@162: 
meillo@162: 		a += saved_a;
meillo@162: 		b += saved_b;
meillo@162: 		c += saved_c;
meillo@162: 		d += saved_d;
meillo@162: 
meillo@162: 		ptr += 64;
meillo@162: 	} while (size -= 64);
meillo@162: 
meillo@162: 	ctx->a = a;
meillo@162: 	ctx->b = b;
meillo@162: 	ctx->c = c;
meillo@162: 	ctx->d = d;
meillo@162: 
meillo@162: 	return ptr;
meillo@162: }
meillo@162: 
meillo@162: void MD5_Init(MD5_CTX *ctx)
meillo@162: {
meillo@162: 	ctx->a = 0x67452301;
meillo@162: 	ctx->b = 0xefcdab89;
meillo@162: 	ctx->c = 0x98badcfe;
meillo@162: 	ctx->d = 0x10325476;
meillo@162: 
meillo@162: 	ctx->lo = 0;
meillo@162: 	ctx->hi = 0;
meillo@162: }
meillo@162: 
meillo@162: void MD5_Update(MD5_CTX *ctx, void *data, unsigned long size)
meillo@162: {
meillo@162: 	MD5_u32plus saved_lo;
meillo@162: 	unsigned long used, free;
meillo@162: 
meillo@162: 	saved_lo = ctx->lo;
meillo@162: 	if ((ctx->lo = (saved_lo + size) & 0x1fffffff) < saved_lo)
meillo@162: 		ctx->hi++;
meillo@162: 	ctx->hi += size >> 29;
meillo@162: 
meillo@162: 	used = saved_lo & 0x3f;
meillo@162: 
meillo@162: 	if (used) {
meillo@162: 		free = 64 - used;
meillo@162: 
meillo@162: 		if (size < free) {
meillo@162: 			memcpy(&ctx->buffer[used], data, size);
meillo@162: 			return;
meillo@162: 		}
meillo@162: 
meillo@162: 		memcpy(&ctx->buffer[used], data, free);
meillo@162: 		data = (unsigned char *)data + free;
meillo@162: 		size -= free;
meillo@162: 		body(ctx, ctx->buffer, 64);
meillo@162: 	}
meillo@162: 
meillo@162: 	if (size >= 64) {
meillo@162: 		data = body(ctx, data, size & ~(unsigned long)0x3f);
meillo@162: 		size &= 0x3f;
meillo@162: 	}
meillo@162: 
meillo@162: 	memcpy(ctx->buffer, data, size);
meillo@162: }
meillo@162: 
meillo@162: void MD5_Final(unsigned char *result, MD5_CTX *ctx)
meillo@162: {
meillo@162: 	unsigned long used, free;
meillo@162: 
meillo@162: 	used = ctx->lo & 0x3f;
meillo@162: 
meillo@162: 	ctx->buffer[used++] = 0x80;
meillo@162: 
meillo@162: 	free = 64 - used;
meillo@162: 
meillo@162: 	if (free < 8) {
meillo@162: 		memset(&ctx->buffer[used], 0, free);
meillo@162: 		body(ctx, ctx->buffer, 64);
meillo@162: 		used = 0;
meillo@162: 		free = 64;
meillo@162: 	}
meillo@162: 
meillo@162: 	memset(&ctx->buffer[used], 0, free - 8);
meillo@162: 
meillo@162: 	ctx->lo <<= 3;
meillo@162: 	ctx->buffer[56] = ctx->lo;
meillo@162: 	ctx->buffer[57] = ctx->lo >> 8;
meillo@162: 	ctx->buffer[58] = ctx->lo >> 16;
meillo@162: 	ctx->buffer[59] = ctx->lo >> 24;
meillo@162: 	ctx->buffer[60] = ctx->hi;
meillo@162: 	ctx->buffer[61] = ctx->hi >> 8;
meillo@162: 	ctx->buffer[62] = ctx->hi >> 16;
meillo@162: 	ctx->buffer[63] = ctx->hi >> 24;
meillo@162: 
meillo@162: 	body(ctx, ctx->buffer, 64);
meillo@162: 
meillo@162: 	result[0] = ctx->a;
meillo@162: 	result[1] = ctx->a >> 8;
meillo@162: 	result[2] = ctx->a >> 16;
meillo@162: 	result[3] = ctx->a >> 24;
meillo@162: 	result[4] = ctx->b;
meillo@162: 	result[5] = ctx->b >> 8;
meillo@162: 	result[6] = ctx->b >> 16;
meillo@162: 	result[7] = ctx->b >> 24;
meillo@162: 	result[8] = ctx->c;
meillo@162: 	result[9] = ctx->c >> 8;
meillo@162: 	result[10] = ctx->c >> 16;
meillo@162: 	result[11] = ctx->c >> 24;
meillo@162: 	result[12] = ctx->d;
meillo@162: 	result[13] = ctx->d >> 8;
meillo@162: 	result[14] = ctx->d >> 16;
meillo@162: 	result[15] = ctx->d >> 24;
meillo@162: 
meillo@162: 	memset(ctx, 0, sizeof(*ctx));
meillo@162: }
meillo@162: 
meillo@162: #endif