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268 lines
8.6 KiB
C
268 lines
8.6 KiB
C
/* md4c.c: "RSA Data Security, Inc. MD4 Message-Digest Algorithm"
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%%% portions-copyright-cmetz
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Portions of this software are Copyright 1996 by Craig Metz, All Rights
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Reserved. The Inner Net License Version 2 applies to these portions of
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the software.
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You should have received a copy of the license with this software. If
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you didn't get a copy, you may request one from <license@inner.net>.
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Portions of this software are Copyright 1995 by Randall Atkinson and Dan
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McDonald, All Rights Reserved. All Rights under this copyright are assigned
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to the U.S. Naval Research Laboratory (NRL). The NRL Copyright Notice and
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License Agreement applies to this software.
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History:
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Modified by cmetz for OPIE 2.2. Use FUNCTION declaration et al.
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Use the real memcpy() and memset(). Use unified context
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structure.
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Modified at NRL for OPIE 2.0.
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Originally from RSADSI reference code.
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*/
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/* Copyright (C) 1990-2, RSA Data Security, Inc. All rights reserved.
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License to copy and use this software is granted provided that it
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is identified as the "RSA Data Security, Inc. MD4 Message-Digest
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Algorithm" in all material mentioning or referencing this software
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or this function.
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License is also granted to make and use derivative works provided
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that such works are identified as "derived from the RSA Data
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Security, Inc. MD4 Message-Digest Algorithm" in all material
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mentioning or referencing the derived work.
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RSA Data Security, Inc. makes no representations concerning either
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the merchantability of this software or the suitability of this
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software for any particular purpose. It is provided "as is"
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without express or implied warranty of any kind.
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These notices must be retained in any copies of any part of this
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documentation and/or software.
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*/
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#include "opie_cfg.h"
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#include "opie.h"
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/* Constants for MD4Transform routine.
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*/
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#define S11 3
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#define S12 7
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#define S13 11
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#define S14 19
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#define S21 3
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#define S22 5
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#define S23 9
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#define S24 13
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#define S31 3
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#define S32 9
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#define S33 11
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#define S34 15
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static VOIDRET MD4Transform __P((UINT4[4], unsigned char[64]));
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static VOIDRET Encode __P((unsigned char *, UINT4 *, unsigned int));
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static VOIDRET Decode __P((UINT4 *, unsigned char *, unsigned int));
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static unsigned char PADDING[64] =
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{
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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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/* F, G and H are basic MD4 functions.
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*/
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#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
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#define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
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#define H(x, y, z) ((x) ^ (y) ^ (z))
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/* ROTATE_LEFT rotates x left n bits.
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*/
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#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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/* FF, GG and HH are transformations for rounds 1, 2 and 3 */
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/* Rotation is separate from addition to prevent recomputation */
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#define FF(a, b, c, d, x, s) { \
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(a) += F ((b), (c), (d)) + (x); \
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(a) = ROTATE_LEFT ((a), (s)); \
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}
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#define GG(a, b, c, d, x, s) { \
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(a) += G ((b), (c), (d)) + (x) + (UINT4)0x5a827999; \
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(a) = ROTATE_LEFT ((a), (s)); \
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}
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#define HH(a, b, c, d, x, s) { \
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(a) += H ((b), (c), (d)) + (x) + (UINT4)0x6ed9eba1; \
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(a) = ROTATE_LEFT ((a), (s)); \
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}
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/* MD4 initialization. Begins an MD4 operation, writing a new context.
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*/
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VOIDRET opiemd4init FUNCTION((context), struct opiemdx_ctx *context)
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{
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context->count[0] = context->count[1] = 0;
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/* Load magic initialization constants. */
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context->state[0] = 0x67452301;
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context->state[1] = 0xefcdab89;
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context->state[2] = 0x98badcfe;
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context->state[3] = 0x10325476;
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}
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/* MD4 block update operation. Continues an MD4 message-digest
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operation, processing another message block, and updating the
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context.
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*/
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VOIDRET opiemd4update FUNCTION((context, input, inputLen), struct opiemdx_ctx *context AND unsigned char *input AND unsigned int inputLen)
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{
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unsigned int i, index, partLen;
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/* Compute number of bytes mod 64 */
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index = (unsigned int) ((context->count[0] >> 3) & 0x3F);
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/* Update number of bits */
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if ((context->count[0] += ((UINT4) inputLen << 3))
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< ((UINT4) inputLen << 3))
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context->count[1]++;
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context->count[1] += ((UINT4) inputLen >> 29);
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partLen = 64 - index;
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/* Transform as many times as possible. */
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if (inputLen >= partLen) {
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memcpy((POINTER) & context->buffer[index], (POINTER) input, partLen);
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MD4Transform(context->state, context->buffer);
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for (i = partLen; i + 63 < inputLen; i += 64)
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MD4Transform(context->state, &input[i]);
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index = 0;
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} else
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i = 0;
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/* Buffer remaining input */
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memcpy((POINTER) & context->buffer[index], (POINTER) & input[i], inputLen - i);
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}
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/* MD4 finalization. Ends an MD4 message-digest operation, writing the
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the message digest and zeroizing the context.
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*/
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VOIDRET opiemd4final FUNCTION((digest, context), unsigned char *digest AND struct opiemdx_ctx *context)
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{
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unsigned char bits[8];
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unsigned int index, padLen;
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/* Save number of bits */
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Encode(bits, context->count, 8);
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/* Pad out to 56 mod 64. */
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index = (unsigned int) ((context->count[0] >> 3) & 0x3f);
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padLen = (index < 56) ? (56 - index) : (120 - index);
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opiemd4update(context, PADDING, padLen);
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/* Append length (before padding) */
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opiemd4update(context, bits, 8);
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/* Store state in digest */
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Encode(digest, context->state, 16);
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/* Zeroize sensitive information. */
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memset((POINTER) context, 0, sizeof(*context));
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}
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/* MD4 basic transformation. Transforms state based on block.
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*/
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static VOIDRET MD4Transform FUNCTION((state, block), UINT4 state[4] AND unsigned char block[64])
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{
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UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
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Decode(x, block, 64);
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/* Round 1 */
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FF(a, b, c, d, x[0], S11); /* 1 */
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FF(d, a, b, c, x[1], S12); /* 2 */
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FF(c, d, a, b, x[2], S13); /* 3 */
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FF(b, c, d, a, x[3], S14); /* 4 */
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FF(a, b, c, d, x[4], S11); /* 5 */
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FF(d, a, b, c, x[5], S12); /* 6 */
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FF(c, d, a, b, x[6], S13); /* 7 */
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FF(b, c, d, a, x[7], S14); /* 8 */
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FF(a, b, c, d, x[8], S11); /* 9 */
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FF(d, a, b, c, x[9], S12); /* 10 */
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FF(c, d, a, b, x[10], S13); /* 11 */
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FF(b, c, d, a, x[11], S14); /* 12 */
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FF(a, b, c, d, x[12], S11); /* 13 */
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FF(d, a, b, c, x[13], S12); /* 14 */
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FF(c, d, a, b, x[14], S13); /* 15 */
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FF(b, c, d, a, x[15], S14); /* 16 */
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/* Round 2 */
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GG(a, b, c, d, x[0], S21); /* 17 */
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GG(d, a, b, c, x[4], S22); /* 18 */
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GG(c, d, a, b, x[8], S23); /* 19 */
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GG(b, c, d, a, x[12], S24); /* 20 */
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GG(a, b, c, d, x[1], S21); /* 21 */
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GG(d, a, b, c, x[5], S22); /* 22 */
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GG(c, d, a, b, x[9], S23); /* 23 */
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GG(b, c, d, a, x[13], S24); /* 24 */
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GG(a, b, c, d, x[2], S21); /* 25 */
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GG(d, a, b, c, x[6], S22); /* 26 */
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GG(c, d, a, b, x[10], S23); /* 27 */
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GG(b, c, d, a, x[14], S24); /* 28 */
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GG(a, b, c, d, x[3], S21); /* 29 */
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GG(d, a, b, c, x[7], S22); /* 30 */
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GG(c, d, a, b, x[11], S23); /* 31 */
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GG(b, c, d, a, x[15], S24); /* 32 */
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/* Round 3 */
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HH(a, b, c, d, x[0], S31); /* 33 */
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HH(d, a, b, c, x[8], S32); /* 34 */
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HH(c, d, a, b, x[4], S33); /* 35 */
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HH(b, c, d, a, x[12], S34); /* 36 */
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HH(a, b, c, d, x[2], S31); /* 37 */
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HH(d, a, b, c, x[10], S32); /* 38 */
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HH(c, d, a, b, x[6], S33); /* 39 */
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HH(b, c, d, a, x[14], S34); /* 40 */
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HH(a, b, c, d, x[1], S31); /* 41 */
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HH(d, a, b, c, x[9], S32); /* 42 */
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HH(c, d, a, b, x[5], S33); /* 43 */
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HH(b, c, d, a, x[13], S34); /* 44 */
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HH(a, b, c, d, x[3], S31); /* 45 */
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HH(d, a, b, c, x[11], S32); /* 46 */
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HH(c, d, a, b, x[7], S33); /* 47 */
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HH(b, c, d, a, x[15], S34); /* 48 */
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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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/* Zeroize sensitive information. */
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memset((POINTER) x, 0, sizeof(x));
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}
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/* Encodes input (UINT4) into output (unsigned char). Assumes len is
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a multiple of 4.
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*/
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static VOIDRET Encode FUNCTION((output, input, len), unsigned char *output AND UINT4 *input AND unsigned int len)
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{
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unsigned int i, j;
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for (i = 0, j = 0; j < len; i++, j += 4) {
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output[j] = (unsigned char) (input[i] & 0xff);
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output[j + 1] = (unsigned char) ((input[i] >> 8) & 0xff);
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output[j + 2] = (unsigned char) ((input[i] >> 16) & 0xff);
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output[j + 3] = (unsigned char) ((input[i] >> 24) & 0xff);
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}
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}
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/* Decodes input (unsigned char) into output (UINT4). Assumes len is
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a multiple of 4.
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*/
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static VOIDRET Decode FUNCTION((output, input, len), UINT4 *output AND unsigned char *input AND unsigned int len)
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{
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unsigned int i, j;
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for (i = 0, j = 0; j < len; i++, j += 4)
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output[i] = ((UINT4) input[j]) | (((UINT4) input[j + 1]) << 8) |
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(((UINT4) input[j + 2]) << 16) | (((UINT4) input[j + 3]) << 24);
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}
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