283 lines
8.1 KiB
C
283 lines
8.1 KiB
C
/*
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* MD4 hash implementation
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* Copyright (c) 2006, Jouni Malinen <j@w1.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Alternatively, this software may be distributed under the terms of BSD
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* license.
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*
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* See README and COPYING for more details.
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*/
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#include "includes.h"
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#include "common.h"
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#include "crypto.h"
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#ifdef INTERNAL_MD4
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#define MD4_BLOCK_LENGTH 64
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#define MD4_DIGEST_LENGTH 16
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typedef struct MD4Context {
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u32 state[4]; /* state */
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u64 count; /* number of bits, mod 2^64 */
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u8 buffer[MD4_BLOCK_LENGTH]; /* input buffer */
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} MD4_CTX;
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static void MD4Init(MD4_CTX *ctx);
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static void MD4Update(MD4_CTX *ctx, const unsigned char *input, size_t len);
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static void MD4Final(unsigned char digest[MD4_DIGEST_LENGTH], MD4_CTX *ctx);
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void md4_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
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{
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MD4_CTX ctx;
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size_t i;
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MD4Init(&ctx);
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for (i = 0; i < num_elem; i++)
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MD4Update(&ctx, addr[i], len[i]);
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MD4Final(mac, &ctx);
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}
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/* ===== start - public domain MD4 implementation ===== */
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/* $OpenBSD: md4.c,v 1.7 2005/08/08 08:05:35 espie Exp $ */
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/*
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* This code implements the MD4 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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* Todd C. Miller modified the MD5 code to do MD4 based on RFC 1186.
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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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* MD4Context structure, pass it to MD4Init, call MD4Update as
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* needed on buffers full of bytes, and then call MD4Final, which
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* will fill a supplied 16-byte array with the digest.
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*/
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#define MD4_DIGEST_STRING_LENGTH (MD4_DIGEST_LENGTH * 2 + 1)
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static void
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MD4Transform(u32 state[4], const u8 block[MD4_BLOCK_LENGTH]);
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#define PUT_64BIT_LE(cp, value) do { \
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(cp)[7] = (value) >> 56; \
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(cp)[6] = (value) >> 48; \
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(cp)[5] = (value) >> 40; \
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(cp)[4] = (value) >> 32; \
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(cp)[3] = (value) >> 24; \
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(cp)[2] = (value) >> 16; \
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(cp)[1] = (value) >> 8; \
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(cp)[0] = (value); } while (0)
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#define PUT_32BIT_LE(cp, value) do { \
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(cp)[3] = (value) >> 24; \
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(cp)[2] = (value) >> 16; \
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(cp)[1] = (value) >> 8; \
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(cp)[0] = (value); } while (0)
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static u8 PADDING[MD4_BLOCK_LENGTH] = {
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0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
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};
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/*
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* Start MD4 accumulation.
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* Set bit count to 0 and buffer to mysterious initialization constants.
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*/
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static void MD4Init(MD4_CTX *ctx)
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{
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ctx->count = 0;
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ctx->state[0] = 0x67452301;
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ctx->state[1] = 0xefcdab89;
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ctx->state[2] = 0x98badcfe;
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ctx->state[3] = 0x10325476;
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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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static void MD4Update(MD4_CTX *ctx, const unsigned char *input, size_t len)
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{
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size_t have, need;
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/* Check how many bytes we already have and how many more we need. */
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have = (size_t)((ctx->count >> 3) & (MD4_BLOCK_LENGTH - 1));
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need = MD4_BLOCK_LENGTH - have;
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/* Update bitcount */
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ctx->count += (u64)len << 3;
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if (len >= need) {
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if (have != 0) {
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os_memcpy(ctx->buffer + have, input, need);
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MD4Transform(ctx->state, ctx->buffer);
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input += need;
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len -= need;
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have = 0;
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}
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/* Process data in MD4_BLOCK_LENGTH-byte chunks. */
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while (len >= MD4_BLOCK_LENGTH) {
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MD4Transform(ctx->state, input);
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input += MD4_BLOCK_LENGTH;
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len -= MD4_BLOCK_LENGTH;
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}
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}
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/* Handle any remaining bytes of data. */
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if (len != 0)
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os_memcpy(ctx->buffer + have, input, len);
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}
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/*
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* Pad 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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static void MD4Pad(MD4_CTX *ctx)
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{
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u8 count[8];
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size_t padlen;
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/* Convert count to 8 bytes in little endian order. */
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PUT_64BIT_LE(count, ctx->count);
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/* Pad out to 56 mod 64. */
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padlen = MD4_BLOCK_LENGTH -
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((ctx->count >> 3) & (MD4_BLOCK_LENGTH - 1));
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if (padlen < 1 + 8)
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padlen += MD4_BLOCK_LENGTH;
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MD4Update(ctx, PADDING, padlen - 8); /* padlen - 8 <= 64 */
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MD4Update(ctx, count, 8);
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}
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/*
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* Final wrapup--call MD4Pad, fill in digest and zero out ctx.
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*/
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static void MD4Final(unsigned char digest[MD4_DIGEST_LENGTH], MD4_CTX *ctx)
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{
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int i;
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MD4Pad(ctx);
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if (digest != NULL) {
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for (i = 0; i < 4; i++)
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PUT_32BIT_LE(digest + i * 4, ctx->state[i]);
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os_memset(ctx, 0, sizeof(*ctx));
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}
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}
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/* The three 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) ((x & y) | (x & z) | (y & z))
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#define F3(x, y, z) (x ^ y ^ z)
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/* This is the central step in the MD4 algorithm. */
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#define MD4STEP(f, w, x, y, z, data, s) \
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( w += f(x, y, z) + data, w = w<<s | w>>(32-s) )
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/*
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* The core of the MD4 algorithm, this alters an existing MD4 hash to
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* reflect the addition of 16 longwords of new data. MD4Update 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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MD4Transform(u32 state[4], const u8 block[MD4_BLOCK_LENGTH])
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{
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u32 a, b, c, d, in[MD4_BLOCK_LENGTH / 4];
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#if BYTE_ORDER == LITTLE_ENDIAN
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os_memcpy(in, block, sizeof(in));
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#else
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for (a = 0; a < MD4_BLOCK_LENGTH / 4; a++) {
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in[a] = (u32)(
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(u32)(block[a * 4 + 0]) |
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(u32)(block[a * 4 + 1]) << 8 |
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(u32)(block[a * 4 + 2]) << 16 |
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(u32)(block[a * 4 + 3]) << 24);
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}
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#endif
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a = state[0];
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b = state[1];
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c = state[2];
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d = state[3];
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MD4STEP(F1, a, b, c, d, in[ 0], 3);
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MD4STEP(F1, d, a, b, c, in[ 1], 7);
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MD4STEP(F1, c, d, a, b, in[ 2], 11);
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MD4STEP(F1, b, c, d, a, in[ 3], 19);
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MD4STEP(F1, a, b, c, d, in[ 4], 3);
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MD4STEP(F1, d, a, b, c, in[ 5], 7);
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MD4STEP(F1, c, d, a, b, in[ 6], 11);
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MD4STEP(F1, b, c, d, a, in[ 7], 19);
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MD4STEP(F1, a, b, c, d, in[ 8], 3);
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MD4STEP(F1, d, a, b, c, in[ 9], 7);
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MD4STEP(F1, c, d, a, b, in[10], 11);
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MD4STEP(F1, b, c, d, a, in[11], 19);
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MD4STEP(F1, a, b, c, d, in[12], 3);
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MD4STEP(F1, d, a, b, c, in[13], 7);
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MD4STEP(F1, c, d, a, b, in[14], 11);
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MD4STEP(F1, b, c, d, a, in[15], 19);
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MD4STEP(F2, a, b, c, d, in[ 0] + 0x5a827999, 3);
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MD4STEP(F2, d, a, b, c, in[ 4] + 0x5a827999, 5);
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MD4STEP(F2, c, d, a, b, in[ 8] + 0x5a827999, 9);
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MD4STEP(F2, b, c, d, a, in[12] + 0x5a827999, 13);
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MD4STEP(F2, a, b, c, d, in[ 1] + 0x5a827999, 3);
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MD4STEP(F2, d, a, b, c, in[ 5] + 0x5a827999, 5);
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MD4STEP(F2, c, d, a, b, in[ 9] + 0x5a827999, 9);
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MD4STEP(F2, b, c, d, a, in[13] + 0x5a827999, 13);
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MD4STEP(F2, a, b, c, d, in[ 2] + 0x5a827999, 3);
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MD4STEP(F2, d, a, b, c, in[ 6] + 0x5a827999, 5);
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MD4STEP(F2, c, d, a, b, in[10] + 0x5a827999, 9);
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MD4STEP(F2, b, c, d, a, in[14] + 0x5a827999, 13);
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MD4STEP(F2, a, b, c, d, in[ 3] + 0x5a827999, 3);
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MD4STEP(F2, d, a, b, c, in[ 7] + 0x5a827999, 5);
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MD4STEP(F2, c, d, a, b, in[11] + 0x5a827999, 9);
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MD4STEP(F2, b, c, d, a, in[15] + 0x5a827999, 13);
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MD4STEP(F3, a, b, c, d, in[ 0] + 0x6ed9eba1, 3);
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MD4STEP(F3, d, a, b, c, in[ 8] + 0x6ed9eba1, 9);
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MD4STEP(F3, c, d, a, b, in[ 4] + 0x6ed9eba1, 11);
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MD4STEP(F3, b, c, d, a, in[12] + 0x6ed9eba1, 15);
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MD4STEP(F3, a, b, c, d, in[ 2] + 0x6ed9eba1, 3);
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MD4STEP(F3, d, a, b, c, in[10] + 0x6ed9eba1, 9);
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MD4STEP(F3, c, d, a, b, in[ 6] + 0x6ed9eba1, 11);
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MD4STEP(F3, b, c, d, a, in[14] + 0x6ed9eba1, 15);
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MD4STEP(F3, a, b, c, d, in[ 1] + 0x6ed9eba1, 3);
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MD4STEP(F3, d, a, b, c, in[ 9] + 0x6ed9eba1, 9);
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MD4STEP(F3, c, d, a, b, in[ 5] + 0x6ed9eba1, 11);
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MD4STEP(F3, b, c, d, a, in[13] + 0x6ed9eba1, 15);
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MD4STEP(F3, a, b, c, d, in[ 3] + 0x6ed9eba1, 3);
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MD4STEP(F3, d, a, b, c, in[11] + 0x6ed9eba1, 9);
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MD4STEP(F3, c, d, a, b, in[ 7] + 0x6ed9eba1, 11);
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MD4STEP(F3, b, c, d, a, in[15] + 0x6ed9eba1, 15);
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state[0] += a;
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state[1] += b;
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state[2] += c;
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state[3] += d;
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}
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/* ===== end - public domain MD4 implementation ===== */
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#endif /* INTERNAL_MD4 */
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