358 lines
10 KiB
C
358 lines
10 KiB
C
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/* $NetBSD: md5c.c,v 1.4 2009/03/16 05:59:21 cegger Exp $ */
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/*
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* This file is derived from the RSA Data Security, Inc. MD5 Message-Digest
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* Algorithm and has been modified by Jason R. Thorpe <thorpej@NetBSD.org>
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* for portability and formatting.
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*/
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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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*
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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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*
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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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*
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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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*
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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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#if defined(_KERNEL) || defined(_STANDALONE)
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#include <sys/param.h>
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#include <sys/md5.h>
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#include <lib/libkern/libkern.h>
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#else
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: md5c.c,v 1.4 2009/03/16 05:59:21 cegger Exp $");
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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#include <sys/types.h>
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#include <assert.h>
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#include <string.h>
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#include <md5.h>
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#endif /* _KERNEL || _STANDALONE */
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#if HAVE_NBTOOL_CONFIG_H
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#include "nbtool_config.h"
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#endif
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#if !HAVE_MD5_H
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#define ZEROIZE(d, l) memset((d), 0, (l))
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typedef unsigned char *POINTER;
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typedef uint16_t UINT2;
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typedef uint32_t UINT4;
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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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#if !defined(_KERNEL) && !defined(_STANDALONE) && defined(__weak_alias)
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__weak_alias(MD5Init,_MD5Init)
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__weak_alias(MD5Update,_MD5Update)
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__weak_alias(MD5Final,_MD5Final)
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__weak_alias(MD5Transform,_MD5Transform)
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#endif
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static void MD5Transform __P((UINT4 [4], const unsigned char [64]));
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static void Encode __P((unsigned char *, UINT4 *, unsigned int));
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static void Decode __P((UINT4 *, const unsigned char *, unsigned int));
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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 void
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Encode (unsigned char *output,
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UINT4 *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 (UINT4). 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 (UINT4 *output,
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const 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] = ((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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static const unsigned char PADDING[64] = {
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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) + (UINT4)(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) + (UINT4)(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) + (UINT4)(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) + (UINT4)(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(MD5_CTX *context)
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{
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_DIAGASSERT(context != 0);
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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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/*
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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(MD5_CTX *context,
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const unsigned char *input, /* input block */
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unsigned int inputLen) /* length of input block */
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{
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unsigned int i, idx, partLen;
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_DIAGASSERT(context != 0);
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_DIAGASSERT(input != 0);
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/* Compute number of bytes mod 64 */
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idx = (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 - idx;
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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[idx], 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, &input[i]);
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idx = 0;
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} else
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i = 0;
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/* Buffer remaining input */
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memcpy(&context->buffer[idx], &input[i], 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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* message digest and zeroing the context.
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*/
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void
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MD5Final(unsigned char digest[16], /* message digest */
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MD5_CTX *context) /* context */
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{
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unsigned char bits[8];
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unsigned int idx, padLen;
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_DIAGASSERT(digest != 0);
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_DIAGASSERT(context != 0);
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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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idx = (unsigned int)((context->count[0] >> 3) & 0x3f);
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padLen = (idx < 56) ? (56 - idx) : (120 - idx);
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MD5Update (context, PADDING, padLen);
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/* Append length (before padding) */
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MD5Update(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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ZEROIZE((POINTER)(void *)context, sizeof(*context));
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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(UINT4 state[4], const 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, 0xd76aa478); /* 1 */
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FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
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FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
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FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
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FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
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FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
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FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
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FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
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FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
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FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
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FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
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FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
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FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
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FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
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FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
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FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
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/* Round 2 */
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GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
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GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
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GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
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GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
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GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
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GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
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GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
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GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
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GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
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GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
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GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
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GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
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GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
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GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
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GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
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GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
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/* Round 3 */
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HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
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HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
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HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
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HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
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HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
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HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
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HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
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HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
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HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
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HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
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HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
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HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
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HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
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HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
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HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
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HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
|
||
|
|
|
||
|
|
/* Round 4 */
|
||
|
|
II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
|
||
|
|
II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
|
||
|
|
II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
|
||
|
|
II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
|
||
|
|
II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
|
||
|
|
II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
|
||
|
|
II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
|
||
|
|
II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
|
||
|
|
II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
|
||
|
|
II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
|
||
|
|
II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
|
||
|
|
II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
|
||
|
|
II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
|
||
|
|
II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
|
||
|
|
II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
|
||
|
|
II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
|
||
|
|
|
||
|
|
state[0] += a;
|
||
|
|
state[1] += b;
|
||
|
|
state[2] += c;
|
||
|
|
state[3] += d;
|
||
|
|
|
||
|
|
/* Zeroize sensitive information. */
|
||
|
|
ZEROIZE((POINTER)(void *)x, sizeof (x));
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* HAVE_MD5_H */
|