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308 lines
10 KiB
C
308 lines
10 KiB
C
/*
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* Copyright (c) 2007, Cameron Rich
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* * Neither the name of the axTLS project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* This file implements the MD5 algorithm as defined in RFC1321
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*/
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#include <string.h>
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#include <stdint.h>
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#include <stddef.h>
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#define EXP_FUNC extern
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#define STDCALL
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#define MD5_SIZE 16
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typedef struct
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{
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uint32_t state[4]; /* state (ABCD) */
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uint32_t count[2]; /* number of bits, modulo 2^64 (lsb first) */
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uint8_t buffer[64]; /* input buffer */
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} MD5_CTX;
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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 functions ----- */
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static void MD5Transform(uint32_t state[4], const uint8_t block[64]);
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static void Encode(uint8_t *output, uint32_t *input, uint32_t len);
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static void Decode(uint32_t *output, const uint8_t *input, uint32_t len);
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static const uint8_t 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, 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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/* ROTATE_LEFT rotates x left n bits. */
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#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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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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#define FF(a, b, c, d, x, s, ac) { \
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(a) += F ((b), (c), (d)) + (x) + (uint32_t)(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) + (uint32_t)(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) + (uint32_t)(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) + (uint32_t)(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 ctx.
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*/
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EXP_FUNC void STDCALL MD5Init(MD5_CTX *ctx)
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{
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ctx->count[0] = ctx->count[1] = 0;
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/* Load magic initialization constants.
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*/
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ctx->state[0] = 0x67452301;
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ctx->state[1] = 0xefcdab89;
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ctx->state[2] = 0x98badcfe;
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ctx->state[3] = 0x10325476;
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}
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/**
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* Accepts an array of octets as the next portion of the message.
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*/
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EXP_FUNC void STDCALL MD5Update(MD5_CTX *ctx, const uint8_t * msg, int len)
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{
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uint32_t x;
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int i, partLen;
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/* Compute number of bytes mod 64 */
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x = (uint32_t)((ctx->count[0] >> 3) & 0x3F);
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/* Update number of bits */
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if ((ctx->count[0] += ((uint32_t)len << 3)) < ((uint32_t)len << 3))
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ctx->count[1]++;
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ctx->count[1] += ((uint32_t)len >> 29);
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partLen = 64 - x;
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/* Transform as many times as possible. */
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if (len >= partLen)
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{
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memcpy(&ctx->buffer[x], msg, partLen);
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MD5Transform(ctx->state, ctx->buffer);
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for (i = partLen; i + 63 < len; i += 64)
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MD5Transform(ctx->state, &msg[i]);
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x = 0;
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}
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else
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i = 0;
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/* Buffer remaining input */
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memcpy(&ctx->buffer[x], &msg[i], len-i);
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}
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/**
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* Return the 128-bit message digest into the user's array
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*/
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EXP_FUNC void STDCALL MD5Final(uint8_t *digest, MD5_CTX *ctx)
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{
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uint8_t bits[8];
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uint32_t x, padLen;
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/* Save number of bits */
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Encode(bits, ctx->count, 8);
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/* Pad out to 56 mod 64.
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*/
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x = (uint32_t)((ctx->count[0] >> 3) & 0x3f);
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padLen = (x < 56) ? (56 - x) : (120 - x);
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MD5Update(ctx, PADDING, padLen);
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/* Append length (before padding) */
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MD5Update(ctx, bits, 8);
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/* Store state in digest */
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Encode(digest, ctx->state, MD5_SIZE);
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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 MD5Transform(uint32_t state[4], const uint8_t block[64])
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{
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uint32_t a = state[0], b = state[1], c = state[2],
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d = state[3], x[MD5_SIZE];
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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 */
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/* Round 4 */
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II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
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II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
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II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
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II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
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II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
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II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
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II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
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II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
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II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
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II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
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II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
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II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
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II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
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II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
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II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
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II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
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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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/**
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* Encodes input (uint32_t) into output (uint8_t). Assumes len is
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* a multiple of 4.
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*/
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static void Encode(uint8_t *output, uint32_t *input, uint32_t len)
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{
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uint32_t i, j;
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for (i = 0, j = 0; j < len; i++, j += 4)
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{
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output[j] = (uint8_t)(input[i] & 0xff);
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output[j+1] = (uint8_t)((input[i] >> 8) & 0xff);
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output[j+2] = (uint8_t)((input[i] >> 16) & 0xff);
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output[j+3] = (uint8_t)((input[i] >> 24) & 0xff);
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}
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}
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/**
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* Decodes input (uint8_t) into output (uint32_t). Assumes len is
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* a multiple of 4.
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*/
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static void Decode(uint32_t *output, const uint8_t *input, uint32_t len)
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{
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uint32_t i, j;
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for (i = 0, j = 0; j < len; i++, j += 4)
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output[i] = ((uint32_t)input[j]) | (((uint32_t)input[j+1]) << 8) |
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(((uint32_t)input[j+2]) << 16) | (((uint32_t)input[j+3]) << 24);
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}
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