/* $NetBSD: md4c.c,v 1.12 2003/12/04 23:39:18 keihan Exp $ */ /* * This file is derived from the RSA Data Security, Inc. MD4 Message-Digest * Algorithm and has been modified by Jason R. Thorpe * for portability and formatting. */ /* * 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 "namespace.h" #include #include #include #include #if HAVE_NBTOOL_CONFIG_H #include "nbtool_config.h" #endif #if !HAVE_MD4_H typedef unsigned char *POINTER; typedef u_int16_t UINT2; typedef u_int32_t UINT4; /* * 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 __P((UINT4 [4], const unsigned char [64])); static void Encode __P((unsigned char *, UINT4 *, unsigned int)); static void Decode __P((UINT4 *, const unsigned char *, unsigned int)); static const 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) + (UINT4)0x5a827999; \ (a) = ROTATE_LEFT ((a), (s)); \ } #define HH(a, b, c, d, x, s) { \ (a) += H ((b), (c), (d)) + (x) + (UINT4)0x6ed9eba1; \ (a) = ROTATE_LEFT ((a), (s)); \ } #ifdef __weak_alias __weak_alias(MD4Init,_MD4Init) __weak_alias(MD4Update,_MD4Update) __weak_alias(MD4Final,_MD4Final) #endif /* * MD4 initialization. Begins an MD4 operation, writing a new context. */ void MD4Init(context) MD4_CTX *context; /* context */ { _DIAGASSERT(context != 0); 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 MD4Update (context, input, inputLen) MD4_CTX *context; /* context */ const unsigned char *input; /* input block */ unsigned int inputLen; /* length of input block */ { unsigned int i, idx, partLen; _DIAGASSERT(context != 0); _DIAGASSERT(input != 0); /* Compute number of bytes mod 64 */ idx = (unsigned int)((context->count[0] >> 3) & 0x3F); /* Update number of bits */ if ((context->count[0] += ((UINT4)inputLen << 3)) < ((UINT4)inputLen << 3)) context->count[1]++; context->count[1] += ((UINT4)inputLen >> 29); partLen = 64 - idx; /* Transform as many times as possible. */ if (inputLen >= partLen) { memcpy(&context->buffer[idx], input, partLen); MD4Transform(context->state, context->buffer); for (i = partLen; i + 63 < inputLen; i += 64) MD4Transform(context->state, &input[i]); idx = 0; } else i = 0; /* Buffer remaining input */ memcpy(&context->buffer[idx], &input[i], inputLen - i); } /* * MD4 finalization. Ends an MD4 message-digest operation, writing the * message digest and zeroing the context. */ void MD4Final (digest, context) unsigned char digest[16]; /* message digest */ MD4_CTX *context; /* context */ { unsigned char bits[8]; unsigned int idx, padLen; _DIAGASSERT(digest != 0); _DIAGASSERT(context != 0); /* Save number of bits */ Encode(bits, context->count, 8); /* Pad out to 56 mod 64. */ idx = (unsigned int)((context->count[0] >> 3) & 0x3f); padLen = (idx < 56) ? (56 - idx) : (120 - idx); MD4Update(context, PADDING, padLen); /* Append length (before padding) */ MD4Update(context, bits, 8); /* Store state in digest */ Encode(digest, context->state, 16); /* Zeroize sensitive information. */ memset(context, 0, sizeof(*context)); } /* * MD4 basic transformation. Transforms state based on block. */ static void MD4Transform (state, block) UINT4 state[4]; const unsigned char block[64]; { UINT4 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(x, 0, sizeof (x)); } /* * Encodes input (UINT4) into output (unsigned char). Assumes len is * a multiple of 4. */ static void Encode(output, input, len) unsigned char *output; UINT4 *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 (UINT4). Assumes len is * a multiple of 4. */ static void Decode(output, input, len) UINT4 *output; const unsigned char *input; unsigned int len; { unsigned int i, j; for (i = 0, j = 0; j < len; i++, j += 4) output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) | (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24); } #endif /* HAVE_MD4_H */