267 lines
7.6 KiB
C
267 lines
7.6 KiB
C
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/*
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* This is an OpenSSL-compatible implementation of the RSA Data Security, Inc.
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* MD4 Message-Digest Algorithm (RFC 1320).
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*
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* Homepage:
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* http://openwall.info/wiki/people/solar/software/public-domain-source-code/md4
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*
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* Author:
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* Alexander Peslyak, better known as Solar Designer <solar at openwall.com>
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*
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* This software was written by Alexander Peslyak in 2001. No copyright is
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* claimed, and the software is hereby placed in the public domain.
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* In case this attempt to disclaim copyright and place the software in the
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* public domain is deemed null and void, then the software is
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* Copyright (c) 2001 Alexander Peslyak and it is hereby released to the
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* general public under the following terms:
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted.
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*
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* There's ABSOLUTELY NO WARRANTY, express or implied.
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*
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* (This is a heavily cut-down "BSD license".)
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*
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* This differs from Colin Plumb's older public domain implementation in that
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* no exactly 32-bit integer data type is required (any 32-bit or wider
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* unsigned integer data type will do), there's no compile-time endianness
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* configuration, and the function prototypes match OpenSSL's. No code from
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* Colin Plumb's implementation has been reused; this comment merely compares
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* the properties of the two independent implementations.
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*
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* The primary goals of this implementation are portability and ease of use.
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* It is meant to be fast, but not as fast as possible. Some known
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* optimizations are not included to reduce source code size and avoid
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* compile-time configuration.
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*/
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#include <string.h>
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#include "md4.h"
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/*
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* The basic MD4 functions.
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*
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* F and G are optimized compared to their RFC 1320 definitions, with the
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* optimization for F borrowed from Colin Plumb's MD5 implementation.
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*/
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#define F(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))
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#define G(x, y, z) (((x) & ((y) | (z))) | ((y) & (z)))
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#define H(x, y, z) ((x) ^ (y) ^ (z))
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/*
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* The MD4 transformation for all three rounds.
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*/
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#define STEP(f, a, b, c, d, x, s) \
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(a) += f((b), (c), (d)) + (x); \
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(a) = (((a) << (s)) | (((a)&0xffffffff) >> (32 - (s))));
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/*
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* SET reads 4 input bytes in little-endian byte order and stores them in a
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* properly aligned word in host byte order.
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*
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* The check for little-endian architectures that tolerate unaligned memory
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* accesses is just an optimization. Nothing will break if it fails to detect
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* a suitable architecture.
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*
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* Unfortunately, this optimization may be a C strict aliasing rules violation
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* if the caller's data buffer has effective type that cannot be aliased by
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* winpr_MD4_u32plus. In practice, this problem may occur if these MD4 routines are
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* inlined into a calling function, or with future and dangerously advanced
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* link-time optimizations. For the time being, keeping these MD4 routines in
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* their own translation unit avoids the problem.
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*/
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#if defined(__i386__) || defined(__x86_64__) || defined(__vax__)
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#define SET(n) (*(winpr_MD4_u32plus*)&ptr[(n)*4])
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#define GET(n) SET(n)
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#else
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#define SET(n) \
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(ctx->block[(n)] = (winpr_MD4_u32plus)ptr[(n)*4] | ((winpr_MD4_u32plus)ptr[(n)*4 + 1] << 8) | \
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((winpr_MD4_u32plus)ptr[(n)*4 + 2] << 16) | \
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((winpr_MD4_u32plus)ptr[(n)*4 + 3] << 24))
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#define GET(n) (ctx->block[(n)])
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#endif
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/*
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* This processes one or more 64-byte data blocks, but does NOT update the bit
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* counters. There are no alignment requirements.
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*/
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static const void* body(WINPR_MD4_CTX* ctx, const void* data, unsigned long size)
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{
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const unsigned char* ptr;
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winpr_MD4_u32plus a, b, c, d;
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winpr_MD4_u32plus saved_a, saved_b, saved_c, saved_d;
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const winpr_MD4_u32plus ac1 = 0x5a827999, ac2 = 0x6ed9eba1;
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ptr = (const unsigned char*)data;
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a = ctx->a;
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b = ctx->b;
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c = ctx->c;
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d = ctx->d;
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do
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{
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saved_a = a;
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saved_b = b;
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saved_c = c;
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saved_d = d;
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/* Round 1 */
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STEP(F, a, b, c, d, SET(0), 3)
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STEP(F, d, a, b, c, SET(1), 7)
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STEP(F, c, d, a, b, SET(2), 11)
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STEP(F, b, c, d, a, SET(3), 19)
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STEP(F, a, b, c, d, SET(4), 3)
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STEP(F, d, a, b, c, SET(5), 7)
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STEP(F, c, d, a, b, SET(6), 11)
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STEP(F, b, c, d, a, SET(7), 19)
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STEP(F, a, b, c, d, SET(8), 3)
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STEP(F, d, a, b, c, SET(9), 7)
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STEP(F, c, d, a, b, SET(10), 11)
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STEP(F, b, c, d, a, SET(11), 19)
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STEP(F, a, b, c, d, SET(12), 3)
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STEP(F, d, a, b, c, SET(13), 7)
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STEP(F, c, d, a, b, SET(14), 11)
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STEP(F, b, c, d, a, SET(15), 19)
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/* Round 2 */
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STEP(G, a, b, c, d, GET(0) + ac1, 3)
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STEP(G, d, a, b, c, GET(4) + ac1, 5)
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STEP(G, c, d, a, b, GET(8) + ac1, 9)
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STEP(G, b, c, d, a, GET(12) + ac1, 13)
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STEP(G, a, b, c, d, GET(1) + ac1, 3)
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STEP(G, d, a, b, c, GET(5) + ac1, 5)
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STEP(G, c, d, a, b, GET(9) + ac1, 9)
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STEP(G, b, c, d, a, GET(13) + ac1, 13)
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STEP(G, a, b, c, d, GET(2) + ac1, 3)
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STEP(G, d, a, b, c, GET(6) + ac1, 5)
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STEP(G, c, d, a, b, GET(10) + ac1, 9)
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STEP(G, b, c, d, a, GET(14) + ac1, 13)
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STEP(G, a, b, c, d, GET(3) + ac1, 3)
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STEP(G, d, a, b, c, GET(7) + ac1, 5)
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STEP(G, c, d, a, b, GET(11) + ac1, 9)
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STEP(G, b, c, d, a, GET(15) + ac1, 13)
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/* Round 3 */
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STEP(H, a, b, c, d, GET(0) + ac2, 3)
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STEP(H, d, a, b, c, GET(8) + ac2, 9)
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STEP(H, c, d, a, b, GET(4) + ac2, 11)
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STEP(H, b, c, d, a, GET(12) + ac2, 15)
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STEP(H, a, b, c, d, GET(2) + ac2, 3)
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STEP(H, d, a, b, c, GET(10) + ac2, 9)
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STEP(H, c, d, a, b, GET(6) + ac2, 11)
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STEP(H, b, c, d, a, GET(14) + ac2, 15)
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STEP(H, a, b, c, d, GET(1) + ac2, 3)
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STEP(H, d, a, b, c, GET(9) + ac2, 9)
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STEP(H, c, d, a, b, GET(5) + ac2, 11)
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STEP(H, b, c, d, a, GET(13) + ac2, 15)
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STEP(H, a, b, c, d, GET(3) + ac2, 3)
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STEP(H, d, a, b, c, GET(11) + ac2, 9)
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STEP(H, c, d, a, b, GET(7) + ac2, 11)
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STEP(H, b, c, d, a, GET(15) + ac2, 15)
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a += saved_a;
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b += saved_b;
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c += saved_c;
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d += saved_d;
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ptr += 64;
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} while (size -= 64);
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ctx->a = a;
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ctx->b = b;
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ctx->c = c;
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ctx->d = d;
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return ptr;
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}
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void winpr_MD4_Init(WINPR_MD4_CTX* ctx)
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{
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ctx->a = 0x67452301;
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ctx->b = 0xefcdab89;
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ctx->c = 0x98badcfe;
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ctx->d = 0x10325476;
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ctx->lo = 0;
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ctx->hi = 0;
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}
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void winpr_MD4_Update(WINPR_MD4_CTX* ctx, const void* data, unsigned long size)
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{
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winpr_MD4_u32plus saved_lo;
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unsigned long used, available;
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saved_lo = ctx->lo;
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if ((ctx->lo = (saved_lo + size) & 0x1fffffff) < saved_lo)
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ctx->hi++;
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ctx->hi += size >> 29;
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used = saved_lo & 0x3f;
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if (used)
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{
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available = 64 - used;
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if (size < available)
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{
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memcpy(&ctx->buffer[used], data, size);
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return;
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}
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memcpy(&ctx->buffer[used], data, available);
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data = (const unsigned char*)data + available;
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size -= available;
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body(ctx, ctx->buffer, 64);
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}
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if (size >= 64)
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{
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data = body(ctx, data, size & ~(unsigned long)0x3f);
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size &= 0x3f;
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}
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memcpy(ctx->buffer, data, size);
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}
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#define OUT(dst, src) \
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(dst)[0] = (unsigned char)(src); \
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(dst)[1] = (unsigned char)((src) >> 8); \
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(dst)[2] = (unsigned char)((src) >> 16); \
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(dst)[3] = (unsigned char)((src) >> 24);
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void winpr_MD4_Final(unsigned char* result, WINPR_MD4_CTX* ctx)
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{
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unsigned long used, available;
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used = ctx->lo & 0x3f;
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ctx->buffer[used++] = 0x80;
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available = 64 - used;
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if (available < 8)
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{
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memset(&ctx->buffer[used], 0, available);
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body(ctx, ctx->buffer, 64);
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used = 0;
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available = 64;
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}
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memset(&ctx->buffer[used], 0, available - 8);
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ctx->lo <<= 3;
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OUT(&ctx->buffer[56], ctx->lo)
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OUT(&ctx->buffer[60], ctx->hi)
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body(ctx, ctx->buffer, 64);
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OUT(&result[0], ctx->a)
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OUT(&result[4], ctx->b)
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OUT(&result[8], ctx->c)
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OUT(&result[12], ctx->d)
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memset(ctx, 0, sizeof(*ctx));
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}
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