mirror of
https://github.com/cryb-to/cryb-to.git
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251 lines
7.3 KiB
C
251 lines
7.3 KiB
C
/*-
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* Copyright (c) 2012 The University of Oslo
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* Copyright (c) 2012-2016 Dag-Erling Smørgrav
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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
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "cryb/impl.h"
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#include <stdint.h>
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#include <string.h>
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#include <cryb/bitwise.h>
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#include <cryb/endian.h>
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#include <cryb/memset_s.h>
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#include <cryb/md5.h>
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/*
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* MD5 - RFC 1321
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*/
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/* initial state */
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static const uint32_t md5_h[4] = {
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0x67452301UL, 0xefcdab89UL, 0x98badcfeUL, 0x10325476UL,
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};
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static const uint32_t md5_k[64] = {
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0xd76aa478UL, 0xe8c7b756UL, 0x242070dbUL, 0xc1bdceeeUL,
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0xf57c0fafUL, 0x4787c62aUL, 0xa8304613UL, 0xfd469501UL,
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0x698098d8UL, 0x8b44f7afUL, 0xffff5bb1UL, 0x895cd7beUL,
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0x6b901122UL, 0xfd987193UL, 0xa679438eUL, 0x49b40821UL,
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0xf61e2562UL, 0xc040b340UL, 0x265e5a51UL, 0xe9b6c7aaUL,
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0xd62f105dUL, 0x02441453UL, 0xd8a1e681UL, 0xe7d3fbc8UL,
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0x21e1cde6UL, 0xc33707d6UL, 0xf4d50d87UL, 0x455a14edUL,
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0xa9e3e905UL, 0xfcefa3f8UL, 0x676f02d9UL, 0x8d2a4c8aUL,
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0xfffa3942UL, 0x8771f681UL, 0x6d9d6122UL, 0xfde5380cUL,
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0xa4beea44UL, 0x4bdecfa9UL, 0xf6bb4b60UL, 0xbebfbc70UL,
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0x289b7ec6UL, 0xeaa127faUL, 0xd4ef3085UL, 0x04881d05UL,
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0xd9d4d039UL, 0xe6db99e5UL, 0x1fa27cf8UL, 0xc4ac5665UL,
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0xf4292244UL, 0x432aff97UL, 0xab9423a7UL, 0xfc93a039UL,
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0x655b59c3UL, 0x8f0ccc92UL, 0xffeff47dUL, 0x85845dd1UL,
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0x6fa87e4fUL, 0xfe2ce6e0UL, 0xa3014314UL, 0x4e0811a1UL,
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0xf7537e82UL, 0xbd3af235UL, 0x2ad7d2bbUL, 0xeb86d391UL,
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};
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void
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md5_init(md5_ctx *ctx)
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{
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memset(ctx, 0, sizeof *ctx);
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memcpy(ctx->state, md5_h, sizeof ctx->state);
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}
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#define md5_f(i, a, b, c, d, x, s) do { \
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(a) += (((b) & (c)) | (~(b) & (d))); \
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(a) += (x)[(i)] + md5_k[(i)]; \
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(a) = rol32((a), (s)) + (b); \
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} while (0)
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#define md5_g(i, a, b, c, d, x, s) do { \
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(a) += (((b) & (d)) | ((c) & ~(d))); \
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(a) += (x)[(5 * (i) + 1) % 16] + md5_k[(i)]; \
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(a) = rol32((a), (s)) + (b); \
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} while (0)
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#define md5_h(i, a, b, c, d, x, s) do { \
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(a) += ((b) ^ (c) ^ (d)); \
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(a) += (x)[(3 * (i) + 5) % 16] + md5_k[(i)]; \
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(a) = rol32((a), (s)) + (b); \
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} while (0)
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#define md5_i(i, a, b, c, d, x, s) do { \
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(a) += ((c) ^ ((b) | ~(d))); \
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(a) += (x)[(7 * (i)) % 16] + md5_k[(i)]; \
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(a) = rol32((a), (s)) + (b); \
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} while (0)
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static void
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md5_compute(md5_ctx *ctx, const uint8_t *block)
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{
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uint32_t w[16], a, b, c, d;
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le32decv(w, block, 16);
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a = ctx->state[0];
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b = ctx->state[1];
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c = ctx->state[2];
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d = ctx->state[3];
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md5_f( 0, a, b, c, d, w, 7);
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md5_f( 1, d, a, b, c, w, 12);
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md5_f( 2, c, d, a, b, w, 17);
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md5_f( 3, b, c, d, a, w, 22);
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md5_f( 4, a, b, c, d, w, 7);
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md5_f( 5, d, a, b, c, w, 12);
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md5_f( 6, c, d, a, b, w, 17);
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md5_f( 7, b, c, d, a, w, 22);
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md5_f( 8, a, b, c, d, w, 7);
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md5_f( 9, d, a, b, c, w, 12);
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md5_f(10, c, d, a, b, w, 17);
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md5_f(11, b, c, d, a, w, 22);
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md5_f(12, a, b, c, d, w, 7);
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md5_f(13, d, a, b, c, w, 12);
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md5_f(14, c, d, a, b, w, 17);
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md5_f(15, b, c, d, a, w, 22);
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md5_g(16, a, b, c, d, w, 5);
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md5_g(17, d, a, b, c, w, 9);
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md5_g(18, c, d, a, b, w, 14);
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md5_g(19, b, c, d, a, w, 20);
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md5_g(20, a, b, c, d, w, 5);
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md5_g(21, d, a, b, c, w, 9);
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md5_g(22, c, d, a, b, w, 14);
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md5_g(23, b, c, d, a, w, 20);
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md5_g(24, a, b, c, d, w, 5);
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md5_g(25, d, a, b, c, w, 9);
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md5_g(26, c, d, a, b, w, 14);
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md5_g(27, b, c, d, a, w, 20);
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md5_g(28, a, b, c, d, w, 5);
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md5_g(29, d, a, b, c, w, 9);
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md5_g(30, c, d, a, b, w, 14);
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md5_g(31, b, c, d, a, w, 20);
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md5_h(32, a, b, c, d, w, 4);
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md5_h(33, d, a, b, c, w, 11);
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md5_h(34, c, d, a, b, w, 16);
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md5_h(35, b, c, d, a, w, 23);
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md5_h(36, a, b, c, d, w, 4);
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md5_h(37, d, a, b, c, w, 11);
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md5_h(38, c, d, a, b, w, 16);
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md5_h(39, b, c, d, a, w, 23);
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md5_h(40, a, b, c, d, w, 4);
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md5_h(41, d, a, b, c, w, 11);
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md5_h(42, c, d, a, b, w, 16);
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md5_h(43, b, c, d, a, w, 23);
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md5_h(44, a, b, c, d, w, 4);
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md5_h(45, d, a, b, c, w, 11);
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md5_h(46, c, d, a, b, w, 16);
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md5_h(47, b, c, d, a, w, 23);
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md5_i(48, a, b, c, d, w, 6);
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md5_i(49, d, a, b, c, w, 10);
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md5_i(50, c, d, a, b, w, 15);
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md5_i(51, b, c, d, a, w, 21);
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md5_i(52, a, b, c, d, w, 6);
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md5_i(53, d, a, b, c, w, 10);
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md5_i(54, c, d, a, b, w, 15);
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md5_i(55, b, c, d, a, w, 21);
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md5_i(56, a, b, c, d, w, 6);
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md5_i(57, d, a, b, c, w, 10);
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md5_i(58, c, d, a, b, w, 15);
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md5_i(59, b, c, d, a, w, 21);
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md5_i(60, a, b, c, d, w, 6);
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md5_i(61, d, a, b, c, w, 10);
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md5_i(62, c, d, a, b, w, 15);
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md5_i(63, b, c, d, a, w, 21);
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ctx->state[0] += a;
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ctx->state[1] += b;
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ctx->state[2] += c;
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ctx->state[3] += d;
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}
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void
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md5_update(md5_ctx *ctx, const void *buf, size_t len)
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{
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size_t copylen;
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while (len) {
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if (ctx->blocklen > 0 || len < sizeof ctx->block) {
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copylen = sizeof ctx->block - ctx->blocklen;
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if (copylen > len)
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copylen = len;
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memcpy(ctx->block + ctx->blocklen, buf, copylen);
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ctx->blocklen += copylen;
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if (ctx->blocklen == sizeof ctx->block) {
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md5_compute(ctx, ctx->block);
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ctx->blocklen = 0;
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}
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} else {
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copylen = sizeof ctx->block;
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md5_compute(ctx, buf);
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}
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ctx->bitlen += copylen * 8;
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buf += copylen;
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len -= copylen;
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}
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}
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void
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md5_final(md5_ctx *ctx, uint8_t *digest)
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{
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ctx->block[ctx->blocklen++] = 0x80;
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memset(ctx->block + ctx->blocklen, 0,
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sizeof ctx->block - ctx->blocklen);
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if (ctx->blocklen > 56) {
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md5_compute(ctx, ctx->block);
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ctx->blocklen = 0;
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memset(ctx->block, 0, sizeof ctx->block);
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}
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le64enc(ctx->block + 56, ctx->bitlen);
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md5_compute(ctx, ctx->block);
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le32encv(digest, ctx->state, 4);
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memset_s(ctx, 0, sizeof *ctx, sizeof *ctx);
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}
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void
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md5_complete(const void *buf, size_t len, uint8_t *digest)
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{
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md5_ctx ctx;
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md5_init(&ctx);
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md5_update(&ctx, buf, len);
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md5_final(&ctx, digest);
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}
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digest_algorithm md5_digest = {
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.name = "md5",
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.contextlen = sizeof(md5_ctx),
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.blocklen = MD5_BLOCK_LEN,
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.digestlen = MD5_DIGEST_LEN,
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.init = (digest_init_func)(void *)md5_init,
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.update = (digest_update_func)(void *)md5_update,
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.final = (digest_final_func)(void *)md5_final,
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.complete = (digest_complete_func)(void *)md5_complete,
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};
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