+++ /dev/null
-/*
- * MD4 (RFC-1320) message digest.
- * Modified from MD5 code by Andrey Panin <pazke@donpac.ru>
- *
- * Written by Solar Designer <solar@openwall.com> in 2001, and placed in
- * the public domain. There's absolutely no warranty.
- *
- * This differs from Colin Plumb's older public domain implementation in
- * that no 32-bit integer data type is required, there's no compile-time
- * endianness configuration, and the function prototypes match OpenSSL's.
- * The primary goals are portability and ease of use.
- *
- * This implementation 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 "md4.h"
-
-#include <string.h>
-
-/*
- * The basic MD4 functions.
- */
-#define F(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))
-#define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
-#define H(x, y, z) ((x) ^ (y) ^ (z))
-
-/*
- * The MD4 transformation for all four rounds.
- */
-#define STEP(f, a, b, c, d, x, s) \
- (a) += f((b), (c), (d)) + (x); \
- (a) = ((a) << (s)) | ((a) >> (32 - (s)))
-
-
-/*
- * SET reads 4 input bytes in little-endian byte order and stores them
- * in a properly aligned word in host byte order.
- *
- * The check for little-endian architectures which tolerate unaligned
- * memory accesses is just an optimization. Nothing will break if it
- * doesn't work.
- */
-#if defined(__i386__) || defined(__x86_64__)
-#define SET(n) \
- (*(const quint32 *)&ptr[(n) * 4])
-#define GET(n) \
- SET(n)
-#else
-#define SET(n) \
- (ctx->block[(n)] = \
- (quint32)ptr[(n) * 4] | \
- ((quint32)ptr[(n) * 4 + 1] << 8) | \
- ((quint32)ptr[(n) * 4 + 2] << 16) | \
- ((quint32)ptr[(n) * 4 + 3] << 24))
-#define GET(n) \
- (ctx->block[(n)])
-#endif
-
-/*
- * This processes one or more 64-byte data blocks, but does NOT update
- * the bit counters. There're no alignment requirements.
- */
-static const unsigned char *body(struct md4_context *ctx, const unsigned char *data, size_t size)
-{
- const unsigned char *ptr;
- quint32 a, b, c, d;
- quint32 saved_a, saved_b, saved_c, saved_d;
-
- ptr = 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), 3);
- STEP(F, d, a, b, c, SET( 1), 7);
- STEP(F, c, d, a, b, SET( 2), 11);
- STEP(F, b, c, d, a, SET( 3), 19);
-
- STEP(F, a, b, c, d, SET( 4), 3);
- STEP(F, d, a, b, c, SET( 5), 7);
- STEP(F, c, d, a, b, SET( 6), 11);
- STEP(F, b, c, d, a, SET( 7), 19);
-
- STEP(F, a, b, c, d, SET( 8), 3);
- STEP(F, d, a, b, c, SET( 9), 7);
- STEP(F, c, d, a, b, SET(10), 11);
- STEP(F, b, c, d, a, SET(11), 19);
-
- STEP(F, a, b, c, d, SET(12), 3);
- STEP(F, d, a, b, c, SET(13), 7);
- STEP(F, c, d, a, b, SET(14), 11);
- STEP(F, b, c, d, a, SET(15), 19);
-/* Round 2 */
- STEP(G, a, b, c, d, GET( 0) + 0x5A827999, 3);
- STEP(G, d, a, b, c, GET( 4) + 0x5A827999, 5);
- STEP(G, c, d, a, b, GET( 8) + 0x5A827999, 9);
- STEP(G, b, c, d, a, GET(12) + 0x5A827999, 13);
-
- STEP(G, a, b, c, d, GET( 1) + 0x5A827999, 3);
- STEP(G, d, a, b, c, GET( 5) + 0x5A827999, 5);
- STEP(G, c, d, a, b, GET( 9) + 0x5A827999, 9);
- STEP(G, b, c, d, a, GET(13) + 0x5A827999, 13);
-
- STEP(G, a, b, c, d, GET( 2) + 0x5A827999, 3);
- STEP(G, d, a, b, c, GET( 6) + 0x5A827999, 5);
- STEP(G, c, d, a, b, GET(10) + 0x5A827999, 9);
- STEP(G, b, c, d, a, GET(14) + 0x5A827999, 13);
-
- STEP(G, a, b, c, d, GET( 3) + 0x5A827999, 3);
- STEP(G, d, a, b, c, GET( 7) + 0x5A827999, 5);
- STEP(G, c, d, a, b, GET(11) + 0x5A827999, 9);
- STEP(G, b, c, d, a, GET(15) + 0x5A827999, 13);
-/* Round 3 */
- STEP(H, a, b, c, d, GET( 0) + 0x6ED9EBA1, 3);
- STEP(H, d, a, b, c, GET( 8) + 0x6ED9EBA1, 9);
- STEP(H, c, d, a, b, GET( 4) + 0x6ED9EBA1, 11);
- STEP(H, b, c, d, a, GET(12) + 0x6ED9EBA1, 15);
-
- STEP(H, a, b, c, d, GET( 2) + 0x6ED9EBA1, 3);
- STEP(H, d, a, b, c, GET(10) + 0x6ED9EBA1, 9);
- STEP(H, c, d, a, b, GET( 6) + 0x6ED9EBA1, 11);
- STEP(H, b, c, d, a, GET(14) + 0x6ED9EBA1, 15);
-
- STEP(H, a, b, c, d, GET( 1) + 0x6ED9EBA1, 3);
- STEP(H, d, a, b, c, GET( 9) + 0x6ED9EBA1, 9);
- STEP(H, c, d, a, b, GET( 5) + 0x6ED9EBA1, 11);
- STEP(H, b, c, d, a, GET(13) + 0x6ED9EBA1, 15);
-
- STEP(H, a, b, c, d, GET( 3) + 0x6ED9EBA1, 3);
- STEP(H, d, a, b, c, GET(11) + 0x6ED9EBA1, 9);
- STEP(H, c, d, a, b, GET( 7) + 0x6ED9EBA1, 11);
- STEP(H, b, c, d, a, GET(15) + 0x6ED9EBA1, 15);
-
- 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;
-}
-
-static void md4_init(struct md4_context *ctx)
-{
- ctx->a = 0x67452301;
- ctx->b = 0xefcdab89;
- ctx->c = 0x98badcfe;
- ctx->d = 0x10325476;
-
- ctx->lo = 0;
- ctx->hi = 0;
-}
-
-static void md4_update(struct md4_context *ctx, const unsigned char *data, size_t size)
-{
- /* @UNSAFE */
- quint32 saved_lo;
- unsigned long used, free;
-
- saved_lo = ctx->lo;
- if ((ctx->lo = (saved_lo + size) & 0x1fffffff) < saved_lo)
- ctx->hi++;
- ctx->hi += size >> 29;
-
- used = saved_lo & 0x3f;
-
- if (used) {
- free = 64 - used;
-
- if (size < free) {
- memcpy(&ctx->buffer[used], data, size);
- return;
- }
-
- memcpy(&ctx->buffer[used], data, free);
- data = (const unsigned char *) data + free;
- size -= free;
- body(ctx, ctx->buffer, 64);
- }
-
- if (size >= 64) {
- data = body(ctx, data, size & ~(unsigned long)0x3f);
- size &= 0x3f;
- }
-
- memcpy(ctx->buffer, data, size);
-}
-
-static void md4_final(struct md4_context *ctx, unsigned char result[MD4_RESULTLEN])
-{
- /* @UNSAFE */
- unsigned long used, free;
-
- used = ctx->lo & 0x3f;
-
- ctx->buffer[used++] = 0x80;
-
- free = 64 - used;
-
- if (free < 8) {
- memset(&ctx->buffer[used], 0, free);
- body(ctx, ctx->buffer, 64);
- used = 0;
- free = 64;
- }
-
- memset(&ctx->buffer[used], 0, free - 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));
-}
-
-#undef F
-#undef G
-#undef H
projects / quassel.git / blobdiff