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535 lines
12 KiB
535 lines
12 KiB
/* Part of the ht://Dig package <http://www.htdig.org/> */
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/* Copyright (c) 1999-2004 The ht://Dig Group */
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/* For copyright details, see the file COPYING in your distribution */
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/* or the GNU Library General Public License (LGPL) version 2 or later */
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/* <http://www.gnu.org/copyleft/lgpl.html> */
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/*
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Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
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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. MD5 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. MD5 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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/*
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This is a slightly modified version
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*/
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#include "mhash_md5.h"
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/*
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Constants for MD5Transform routine.
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*/
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#define S11 7
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#define S12 12
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#define S13 17
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#define S14 22
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#define S21 5
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#define S22 9
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#define S23 14
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#define S24 20
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#define S31 4
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#define S32 11
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#define S33 16
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#define S34 23
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#define S41 6
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#define S42 10
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#define S43 15
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#define S44 21
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static void MD5Transform PROTO_LIST((word32[4], unsigned char[64]));
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static void Encode PROTO_LIST
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((unsigned char *, word32 *, unsigned int));
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static void Decode PROTO_LIST
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((word32 *, unsigned char *, unsigned int));
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static void MD5_memcpy PROTO_LIST((POINTER, POINTER, unsigned int));
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static void MD5_memset PROTO_LIST((POINTER, int, 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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/*
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F, G, H and I are basic MD5 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) & (z)) | ((y) & (~z)))
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#define H(x, y, z) ((x) ^ (y) ^ (z))
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#define I(x, y, z) ((y) ^ ((x) | (~z)))
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/*
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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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/*
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FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
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Rotation is separate from addition to prevent recomputation.
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*/
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#define FF(a, b, c, d, x, s, ac) { \
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(a) += F ((b), (c), (d)) + (x) + (word32)(ac); \
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(a) = ROTATE_LEFT ((a), (s)); \
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(a) += (b); \
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}
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#define GG(a, b, c, d, x, s, ac) { \
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(a) += G ((b), (c), (d)) + (x) + (word32)(ac); \
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(a) = ROTATE_LEFT ((a), (s)); \
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(a) += (b); \
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}
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#define HH(a, b, c, d, x, s, ac) { \
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(a) += H ((b), (c), (d)) + (x) + (word32)(ac); \
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(a) = ROTATE_LEFT ((a), (s)); \
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(a) += (b); \
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}
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#define II(a, b, c, d, x, s, ac) { \
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(a) += I ((b), (c), (d)) + (x) + (word32)(ac); \
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(a) = ROTATE_LEFT ((a), (s)); \
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(a) += (b); \
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}
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/*
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MD5 initialization. Begins an MD5 operation, writing a new context.
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*/
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void
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MD5Init(context)
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MD5_CTX *context; /*
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context
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*/
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{
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context->count[0] = context->count[1] = 0;
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/*
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Load magic initialization constants.
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*/
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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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/*
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MD5 block update operation. Continues an MD5 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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void
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MD5Update(context, input, inputLen)
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MD5_CTX *context; /*
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context
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*/
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const unsigned char *input; /*
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input block
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*/
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unsigned int inputLen; /*
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length of input block
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*/
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{
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unsigned int i, index, partLen;
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/*
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Compute number of bytes mod 64
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*/
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index = (unsigned int) ((context->count[0] >> 3) & 0x3F);
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/*
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Update number of bits
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*/
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if ((context->count[0] += ((word32) inputLen << 3)) < ((word32) inputLen << 3))
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context->count[1]++;
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context->count[1] += ((word32) inputLen >> 29);
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partLen = 64 - index;
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/*
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Transform as many times as possible.
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*/
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if (inputLen >= partLen) {
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MD5_memcpy
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((POINTER) & context->buffer[index], (POINTER) input, partLen);
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MD5Transform(context->state, context->buffer);
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for (i = partLen; i + 63 < inputLen; i += 64)
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MD5Transform(context->state, (unsigned char *) &input[i]);
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index = 0;
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}
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else
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i = 0;
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/*
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Buffer remaining input
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*/
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MD5_memcpy
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((POINTER) & context->buffer[index], (POINTER) & input[i],
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inputLen - i);
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}
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/*
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MD5 finalization. Ends an MD5 message-digest operation, writing the
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the message digest and zeroizing the context.
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*/
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void *
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MD5Final(context)
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MD5_CTX *context; /*
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context
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*/
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{
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unsigned char bits[8];
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unsigned int index, padLen;
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unsigned char *digest = malloc(16);
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/*
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Save number of bits
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*/
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Encode(bits, context->count, 8);
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/*
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Pad out to 56 mod 64.
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*/
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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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MD5Update(context, PADDING, padLen);
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/*
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Append length (before padding)
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*/
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MD5Update(context, bits, 8);
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/*
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Store state in digest
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*/
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Encode(digest, context->state, 16);
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/*
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Zeroize sensitive information.
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*/
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MD5_memset((POINTER) context, 0, sizeof(*context));
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return digest;
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}
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/*
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MD5 basic transformation. Transforms state based on block.
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*/
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static void
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MD5Transform(state, block)
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word32 state[4];
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unsigned char block[64];
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{
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word32 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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/*
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Round 1
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*/
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FF(a, b, c, d, x[0], S11, 0xd76aa478); /*
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1
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*/
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FF(d, a, b, c, x[1], S12, 0xe8c7b756); /*
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2
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*/
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FF(c, d, a, b, x[2], S13, 0x242070db); /*
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3
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*/
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FF(b, c, d, a, x[3], S14, 0xc1bdceee); /*
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4
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*/
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FF(a, b, c, d, x[4], S11, 0xf57c0faf); /*
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5
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*/
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FF(d, a, b, c, x[5], S12, 0x4787c62a); /*
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6
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*/
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FF(c, d, a, b, x[6], S13, 0xa8304613); /*
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7
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*/
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FF(b, c, d, a, x[7], S14, 0xfd469501); /*
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8
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*/
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FF(a, b, c, d, x[8], S11, 0x698098d8); /*
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9
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*/
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FF(d, a, b, c, x[9], S12, 0x8b44f7af); /*
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10
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*/
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FF(c, d, a, b, x[10], S13, 0xffff5bb1); /*
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11
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*/
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FF(b, c, d, a, x[11], S14, 0x895cd7be); /*
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12
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*/
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FF(a, b, c, d, x[12], S11, 0x6b901122); /*
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13
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*/
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FF(d, a, b, c, x[13], S12, 0xfd987193); /*
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14
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*/
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FF(c, d, a, b, x[14], S13, 0xa679438e); /*
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15
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*/
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FF(b, c, d, a, x[15], S14, 0x49b40821); /*
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16
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*/
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/*
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Round 2
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*/
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GG(a, b, c, d, x[1], S21, 0xf61e2562); /*
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17
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*/
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GG(d, a, b, c, x[6], S22, 0xc040b340); /*
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18
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*/
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GG(c, d, a, b, x[11], S23, 0x265e5a51); /*
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19
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*/
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GG(b, c, d, a, x[0], S24, 0xe9b6c7aa); /*
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20
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*/
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GG(a, b, c, d, x[5], S21, 0xd62f105d); /*
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21
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*/
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GG(d, a, b, c, x[10], S22, 0x2441453); /*
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22
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*/
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GG(c, d, a, b, x[15], S23, 0xd8a1e681); /*
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23
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*/
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GG(b, c, d, a, x[4], S24, 0xe7d3fbc8); /*
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24
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*/
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GG(a, b, c, d, x[9], S21, 0x21e1cde6); /*
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25
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*/
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GG(d, a, b, c, x[14], S22, 0xc33707d6); /*
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26
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*/
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GG(c, d, a, b, x[3], S23, 0xf4d50d87); /*
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27
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*/
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GG(b, c, d, a, x[8], S24, 0x455a14ed); /*
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28
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*/
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GG(a, b, c, d, x[13], S21, 0xa9e3e905); /*
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29
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*/
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GG(d, a, b, c, x[2], S22, 0xfcefa3f8); /*
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30
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*/
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GG(c, d, a, b, x[7], S23, 0x676f02d9); /*
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31
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*/
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GG(b, c, d, a, x[12], S24, 0x8d2a4c8a); /*
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32
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*/
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/*
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Round 3
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*/
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HH(a, b, c, d, x[5], S31, 0xfffa3942); /*
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33
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*/
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HH(d, a, b, c, x[8], S32, 0x8771f681); /*
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34
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*/
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HH(c, d, a, b, x[11], S33, 0x6d9d6122); /*
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35
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*/
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HH(b, c, d, a, x[14], S34, 0xfde5380c); /*
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36
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*/
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HH(a, b, c, d, x[1], S31, 0xa4beea44); /*
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37
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*/
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HH(d, a, b, c, x[4], S32, 0x4bdecfa9); /*
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38
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*/
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HH(c, d, a, b, x[7], S33, 0xf6bb4b60); /*
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39
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*/
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HH(b, c, d, a, x[10], S34, 0xbebfbc70); /*
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40
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*/
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HH(a, b, c, d, x[13], S31, 0x289b7ec6); /*
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41
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*/
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HH(d, a, b, c, x[0], S32, 0xeaa127fa); /*
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42
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*/
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HH(c, d, a, b, x[3], S33, 0xd4ef3085); /*
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43
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*/
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HH(b, c, d, a, x[6], S34, 0x4881d05); /*
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44
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*/
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HH(a, b, c, d, x[9], S31, 0xd9d4d039); /*
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45
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*/
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HH(d, a, b, c, x[12], S32, 0xe6db99e5); /*
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46
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*/
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HH(c, d, a, b, x[15], S33, 0x1fa27cf8); /*
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47
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*/
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HH(b, c, d, a, x[2], S34, 0xc4ac5665); /*
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48
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*/
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/*
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Round 4
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*/
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II(a, b, c, d, x[0], S41, 0xf4292244); /*
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49
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*/
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II(d, a, b, c, x[7], S42, 0x432aff97); /*
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50
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*/
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II(c, d, a, b, x[14], S43, 0xab9423a7); /*
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51
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*/
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II(b, c, d, a, x[5], S44, 0xfc93a039); /*
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52
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*/
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II(a, b, c, d, x[12], S41, 0x655b59c3); /*
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53
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*/
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II(d, a, b, c, x[3], S42, 0x8f0ccc92); /*
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54
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*/
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II(c, d, a, b, x[10], S43, 0xffeff47d); /*
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55
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*/
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II(b, c, d, a, x[1], S44, 0x85845dd1); /*
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56
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*/
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II(a, b, c, d, x[8], S41, 0x6fa87e4f); /*
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57
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*/
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II(d, a, b, c, x[15], S42, 0xfe2ce6e0); /*
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58
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*/
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II(c, d, a, b, x[6], S43, 0xa3014314); /*
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59
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*/
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II(b, c, d, a, x[13], S44, 0x4e0811a1); /*
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60
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*/
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II(a, b, c, d, x[4], S41, 0xf7537e82); /*
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61
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*/
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II(d, a, b, c, x[11], S42, 0xbd3af235); /*
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62
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*/
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II(c, d, a, b, x[2], S43, 0x2ad7d2bb); /*
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63
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*/
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II(b, c, d, a, x[9], S44, 0xeb86d391); /*
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64
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*/
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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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Zeroize sensitive information.
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*/
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MD5_memset((POINTER) x, 0, sizeof(x));
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}
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/*
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Encodes input (word32) into output (unsigned char). Assumes len is
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a multiple of 4.
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*/
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static void
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Encode(output, input, len)
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unsigned char *output;
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word32 *input;
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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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/*
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Decodes input (unsigned char) into output (word32). Assumes len is
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a multiple of 4.
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*/
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static void
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Decode(output, input, len)
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word32 *output;
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unsigned char *input;
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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] = ((word32) input[j]) | (((word32) input[j + 1]) << 8) |
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(((word32) input[j + 2]) << 16) | (((word32) input[j + 3]) << 24);
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}
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/*
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Note: Replace "for loop" with standard memcpy if possible.
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*/
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static void
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MD5_memcpy(output, input, len)
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POINTER output;
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POINTER input;
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unsigned int len;
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{
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unsigned int i;
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for (i = 0; i < len; i++)
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output[i] = input[i];
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}
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/*
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Note: Replace "for loop" with standard memset if possible.
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*/
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static void
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MD5_memset(output, value, len)
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POINTER output;
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int value;
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unsigned int len;
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < len; i++)
|
|
((char *) output)[i] = (char) value;
|
|
}
|