+++ /dev/null
-/* MD4C.C - RSA Data Security, Inc., MD4 message-digest algorithm
- */
-
-/* Copyright (C) 1990-2, RSA Data Security, Inc. All rights reserved.
-
- License to copy and use this software is granted provided that it
- is identified as the "RSA Data Security, Inc. MD4 Message-Digest
- Algorithm" in all material mentioning or referencing this software
- or this function.
-
- License is also granted to make and use derivative works provided
- that such works are identified as "derived from the RSA Data
- Security, Inc. MD4 Message-Digest Algorithm" in all material
- mentioning or referencing the derived work.
-
- RSA Data Security, Inc. makes no representations concerning either
- the merchantability of this software or the suitability of this
- software for any particular purpose. It is provided "as is"
- without express or implied warranty of any kind.
-
- These notices must be retained in any copies of any part of this
- documentation and/or software.
- */
-
-#include "md4.h"
-
-/* Constants for MD4Transform routine.
- */
-#define S11 3
-#define S12 7
-#define S13 11
-#define S14 19
-#define S21 3
-#define S22 5
-#define S23 9
-#define S24 13
-#define S31 3
-#define S32 9
-#define S33 11
-#define S34 15
-
-static void MD4Transform(uint32_t [4], unsigned char [64]);
-static void Encode(unsigned char *, uint32_t *, unsigned int);
-static void Decode(uint32_t *, unsigned char *, unsigned int);
-
-static unsigned char PADDING[64] = {
- 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
-};
-
-/* F, G and H are basic MD4 functions.
- */
-#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
-#define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
-#define H(x, y, z) ((x) ^ (y) ^ (z))
-
-/* ROTATE_LEFT rotates x left n bits.
- */
-#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
-
-/* FF, GG and HH are transformations for rounds 1, 2 and 3 */
-/* Rotation is separate from addition to prevent recomputation */
-#define FF(a, b, c, d, x, s) { \
- (a) += F ((b), (c), (d)) + (x); \
- (a) = ROTATE_LEFT ((a), (s)); \
- }
-#define GG(a, b, c, d, x, s) { \
- (a) += G ((b), (c), (d)) + (x) + (uint32_t)0x5a827999; \
- (a) = ROTATE_LEFT ((a), (s)); \
- }
-#define HH(a, b, c, d, x, s) { \
- (a) += H ((b), (c), (d)) + (x) + (uint32_t)0x6ed9eba1; \
- (a) = ROTATE_LEFT ((a), (s)); \
- }
-
-/* MD4 initialization. Begins an MD4 operation, writing a new context.
- */
-void rsaref_MD4Init (context)
-rsaref_MD4_CTX *context; /* context */
-{
- context->count[0] = context->count[1] = 0;
-
- /* Load magic initialization constants.
- */
- context->state[0] = 0x67452301;
- context->state[1] = 0xefcdab89;
- context->state[2] = 0x98badcfe;
- context->state[3] = 0x10325476;
-}
-
-/* MD4 block update operation. Continues an MD4 message-digest
- operation, processing another message block, and updating the
- context.
- */
-void rsaref_MD4Update (context, input, inputLen)
-rsaref_MD4_CTX *context; /* context */
-unsigned char *input; /* input block */
-unsigned int inputLen; /* length of input block */
-{
- unsigned int i, index, partLen;
-
- /* Compute number of bytes mod 64 */
- index = (unsigned int)((context->count[0] >> 3) & 0x3F);
- /* Update number of bits */
- if ((context->count[0] += ((uint32_t)inputLen << 3))
- < ((uint32_t)inputLen << 3))
- context->count[1]++;
- context->count[1] += ((uint32_t)inputLen >> 29);
-
- partLen = 64 - index;
-
- /* Transform as many times as possible.
- */
- if (inputLen >= partLen) {
- memcpy
- ((unsigned char *)&context->buffer[index], (unsigned char *)input, partLen);
- MD4Transform (context->state, context->buffer);
-
- for (i = partLen; i + 63 < inputLen; i += 64)
- MD4Transform (context->state, &input[i]);
-
- index = 0;
- }
- else
- i = 0;
-
- /* Buffer remaining input */
- memcpy
- ((unsigned char *)&context->buffer[index], (unsigned char *)&input[i],
- inputLen-i);
-}
-
-/* MD4 finalization. Ends an MD4 message-digest operation, writing the
- the message digest and zeroizing the context.
- */
-void rsaref_MD4Final (digest, context)
-unsigned char digest[16]; /* message digest */
-rsaref_MD4_CTX *context; /* context */
-{
- unsigned char bits[8];
- unsigned int index, padLen;
-
- /* Save number of bits */
- Encode (bits, context->count, 8);
-
- /* Pad out to 56 mod 64.
- */
- index = (unsigned int)((context->count[0] >> 3) & 0x3f);
- padLen = (index < 56) ? (56 - index) : (120 - index);
- rsaref_MD4Update (context, PADDING, padLen);
-
- /* Append length (before padding) */
- rsaref_MD4Update (context, bits, 8);
- /* Store state in digest */
- Encode (digest, context->state, 16);
-
- /* Zeroize sensitive information.
- */
- memset ((unsigned char *)context, 0, sizeof (*context));
-}
-
-/* MD4 basic transformation. Transforms state based on block.
- */
-static void MD4Transform (state, block)
-uint32_t state[4];
-unsigned char block[64];
-{
- uint32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16];
-
- Decode (x, block, 64);
-
- /* Round 1 */
- FF (a, b, c, d, x[ 0], S11); /* 1 */
- FF (d, a, b, c, x[ 1], S12); /* 2 */
- FF (c, d, a, b, x[ 2], S13); /* 3 */
- FF (b, c, d, a, x[ 3], S14); /* 4 */
- FF (a, b, c, d, x[ 4], S11); /* 5 */
- FF (d, a, b, c, x[ 5], S12); /* 6 */
- FF (c, d, a, b, x[ 6], S13); /* 7 */
- FF (b, c, d, a, x[ 7], S14); /* 8 */
- FF (a, b, c, d, x[ 8], S11); /* 9 */
- FF (d, a, b, c, x[ 9], S12); /* 10 */
- FF (c, d, a, b, x[10], S13); /* 11 */
- FF (b, c, d, a, x[11], S14); /* 12 */
- FF (a, b, c, d, x[12], S11); /* 13 */
- FF (d, a, b, c, x[13], S12); /* 14 */
- FF (c, d, a, b, x[14], S13); /* 15 */
- FF (b, c, d, a, x[15], S14); /* 16 */
-
- /* Round 2 */
- GG (a, b, c, d, x[ 0], S21); /* 17 */
- GG (d, a, b, c, x[ 4], S22); /* 18 */
- GG (c, d, a, b, x[ 8], S23); /* 19 */
- GG (b, c, d, a, x[12], S24); /* 20 */
- GG (a, b, c, d, x[ 1], S21); /* 21 */
- GG (d, a, b, c, x[ 5], S22); /* 22 */
- GG (c, d, a, b, x[ 9], S23); /* 23 */
- GG (b, c, d, a, x[13], S24); /* 24 */
- GG (a, b, c, d, x[ 2], S21); /* 25 */
- GG (d, a, b, c, x[ 6], S22); /* 26 */
- GG (c, d, a, b, x[10], S23); /* 27 */
- GG (b, c, d, a, x[14], S24); /* 28 */
- GG (a, b, c, d, x[ 3], S21); /* 29 */
- GG (d, a, b, c, x[ 7], S22); /* 30 */
- GG (c, d, a, b, x[11], S23); /* 31 */
- GG (b, c, d, a, x[15], S24); /* 32 */
-
- /* Round 3 */
- HH (a, b, c, d, x[ 0], S31); /* 33 */
- HH (d, a, b, c, x[ 8], S32); /* 34 */
- HH (c, d, a, b, x[ 4], S33); /* 35 */
- HH (b, c, d, a, x[12], S34); /* 36 */
- HH (a, b, c, d, x[ 2], S31); /* 37 */
- HH (d, a, b, c, x[10], S32); /* 38 */
- HH (c, d, a, b, x[ 6], S33); /* 39 */
- HH (b, c, d, a, x[14], S34); /* 40 */
- HH (a, b, c, d, x[ 1], S31); /* 41 */
- HH (d, a, b, c, x[ 9], S32); /* 42 */
- HH (c, d, a, b, x[ 5], S33); /* 43 */
- HH (b, c, d, a, x[13], S34); /* 44 */
- HH (a, b, c, d, x[ 3], S31); /* 45 */
- HH (d, a, b, c, x[11], S32); /* 46 */
- HH (c, d, a, b, x[ 7], S33); /* 47 */
- HH (b, c, d, a, x[15], S34); /* 48 */
-
- state[0] += a;
- state[1] += b;
- state[2] += c;
- state[3] += d;
-
- /* Zeroize sensitive information.
- */
- memset ((unsigned char *)x, 0, sizeof (x));
-}
-
-/* Encodes input (uint32_t) into output (unsigned char). Assumes len is
- a multiple of 4.
- */
-static void Encode (output, input, len)
-unsigned char *output;
-uint32_t *input;
-unsigned int len;
-{
- unsigned int i, j;
-
- for (i = 0, j = 0; j < len; i++, j += 4) {
- output[j] = (unsigned char)(input[i] & 0xff);
- output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
- output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
- output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
- }
-}
-
-/* Decodes input (unsigned char) into output (uint32_t). Assumes len is
- a multiple of 4.
- */
-static void Decode (output, input, len)
-
-uint32_t *output;
-unsigned char *input;
-unsigned int len;
-{
- unsigned int i, j;
-
- for (i = 0, j = 0; j < len; i++, j += 4)
- output[i] = ((uint32_t)input[j]) | (((uint32_t)input[j+1]) << 8) |
- (((uint32_t)input[j+2]) << 16) | (((uint32_t)input[j+3]) << 24);
-}
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