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diff --git a/src/lib/md5.c b/src/lib/md5.c
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+/*
+ * Ouroboros - Copyright (C) 2016 - 2017
+ *
+ * SHA3 algorithm
+ *
+ * Dimitri Staessens <dimitri.staessens@ugent.be>
+ * Sander Vrijders <sander.vrijders@ugent.be>
+ *
+ * This implementation is adapted and redistributed from the RHASH
+ * project
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * version 2.1 as published by the Free Software Foundation.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ * -- original license
+ *
+ * md5.c - an implementation of the MD5 algorithm, based on RFC 1321.
+ *
+ * Copyright: 2007-2012 Aleksey Kravchenko <rhash.admin@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. Use this program at your own risk!
+ */
+
+#include <ouroboros/endian.h>
+#include <ouroboros/md5.h>
+
+#include <assert.h>
+#include <string.h>
+
+#define ROTL32(dword, n) ((dword) << (n) ^ ((dword) >> (32 - (n))))
+
+void rhash_md5_init(struct md5_ctx *ctx)
+{
+ ctx->length = 0;
+
+ /* initialize state */
+ ctx->hash[0] = 0x67452301;
+ ctx->hash[1] = 0xefcdab89;
+ ctx->hash[2] = 0x98badcfe;
+ ctx->hash[3] = 0x10325476;
+}
+
+#define MD5_F(x, y, z) ((((y) ^ (z)) & (x)) ^ (z))
+#define MD5_G(x, y, z) (((x) & (z)) | ((y) & (~z)))
+#define MD5_H(x, y, z) ((x) ^ (y) ^ (z))
+#define MD5_I(x, y, z) ((y) ^ ((x) | (~z)))
+
+/* transformations for rounds 1, 2, 3, and 4. */
+#define MD5_ROUND1(a, b, c, d, x, s, ac) { \
+ (a) += MD5_F((b), (c), (d)) + (x) + (ac); \
+ (a) = ROTL32((a), (s)); \
+ (a) += (b); \
+}
+
+#define MD5_ROUND2(a, b, c, d, x, s, ac) { \
+ (a) += MD5_G((b), (c), (d)) + (x) + (ac); \
+ (a) = ROTL32((a), (s)); \
+ (a) += (b); \
+}
+
+#define MD5_ROUND3(a, b, c, d, x, s, ac) { \
+ (a) += MD5_H((b), (c), (d)) + (x) + (ac); \
+ (a) = ROTL32((a), (s)); \
+ (a) += (b); \
+}
+
+#define MD5_ROUND4(a, b, c, d, x, s, ac) { \
+ (a) += MD5_I((b), (c), (d)) + (x) + (ac); \
+ (a) = ROTL32((a), (s)); \
+ (a) += (b); \
+}
+
+static void le32_copy(void * to,
+ int index,
+ const void * from,
+ size_t length)
+{
+ const uint32_t * src = (const uint32_t *) from;
+ const uint32_t * end = (const uint32_t *) ((const uint8_t *)
+ src + length);
+ uint32_t * dst = (uint32_t *)((uint8_t *) to + index);
+ while (src < end)
+ *(dst++) = htole32(*(src++));
+}
+
+static void rhash_md5_process_block(uint32_t * state,
+ const unsigned * x)
+{
+ register uint32_t a = state[0];
+ register uint32_t b = state[1];
+ register uint32_t c = state[2];
+ register uint32_t d = state[3];
+
+ MD5_ROUND1(a, b, c, d, x[ 0], 7, 0xd76aa478);
+ MD5_ROUND1(d, a, b, c, x[ 1], 12, 0xe8c7b756);
+ MD5_ROUND1(c, d, a, b, x[ 2], 17, 0x242070db);
+ MD5_ROUND1(b, c, d, a, x[ 3], 22, 0xc1bdceee);
+ MD5_ROUND1(a, b, c, d, x[ 4], 7, 0xf57c0faf);
+ MD5_ROUND1(d, a, b, c, x[ 5], 12, 0x4787c62a);
+ MD5_ROUND1(c, d, a, b, x[ 6], 17, 0xa8304613);
+ MD5_ROUND1(b, c, d, a, x[ 7], 22, 0xfd469501);
+ MD5_ROUND1(a, b, c, d, x[ 8], 7, 0x698098d8);
+ MD5_ROUND1(d, a, b, c, x[ 9], 12, 0x8b44f7af);
+ MD5_ROUND1(c, d, a, b, x[10], 17, 0xffff5bb1);
+ MD5_ROUND1(b, c, d, a, x[11], 22, 0x895cd7be);
+ MD5_ROUND1(a, b, c, d, x[12], 7, 0x6b901122);
+ MD5_ROUND1(d, a, b, c, x[13], 12, 0xfd987193);
+ MD5_ROUND1(c, d, a, b, x[14], 17, 0xa679438e);
+ MD5_ROUND1(b, c, d, a, x[15], 22, 0x49b40821);
+
+ MD5_ROUND2(a, b, c, d, x[ 1], 5, 0xf61e2562);
+ MD5_ROUND2(d, a, b, c, x[ 6], 9, 0xc040b340);
+ MD5_ROUND2(c, d, a, b, x[11], 14, 0x265e5a51);
+ MD5_ROUND2(b, c, d, a, x[ 0], 20, 0xe9b6c7aa);
+ MD5_ROUND2(a, b, c, d, x[ 5], 5, 0xd62f105d);
+ MD5_ROUND2(d, a, b, c, x[10], 9, 0x2441453);
+ MD5_ROUND2(c, d, a, b, x[15], 14, 0xd8a1e681);
+ MD5_ROUND2(b, c, d, a, x[ 4], 20, 0xe7d3fbc8);
+ MD5_ROUND2(a, b, c, d, x[ 9], 5, 0x21e1cde6);
+ MD5_ROUND2(d, a, b, c, x[14], 9, 0xc33707d6);
+ MD5_ROUND2(c, d, a, b, x[ 3], 14, 0xf4d50d87);
+ MD5_ROUND2(b, c, d, a, x[ 8], 20, 0x455a14ed);
+ MD5_ROUND2(a, b, c, d, x[13], 5, 0xa9e3e905);
+ MD5_ROUND2(d, a, b, c, x[ 2], 9, 0xfcefa3f8);
+ MD5_ROUND2(c, d, a, b, x[ 7], 14, 0x676f02d9);
+ MD5_ROUND2(b, c, d, a, x[12], 20, 0x8d2a4c8a);
+
+ MD5_ROUND3(a, b, c, d, x[ 5], 4, 0xfffa3942);
+ MD5_ROUND3(d, a, b, c, x[ 8], 11, 0x8771f681);
+ MD5_ROUND3(c, d, a, b, x[11], 16, 0x6d9d6122);
+ MD5_ROUND3(b, c, d, a, x[14], 23, 0xfde5380c);
+ MD5_ROUND3(a, b, c, d, x[ 1], 4, 0xa4beea44);
+ MD5_ROUND3(d, a, b, c, x[ 4], 11, 0x4bdecfa9);
+ MD5_ROUND3(c, d, a, b, x[ 7], 16, 0xf6bb4b60);
+ MD5_ROUND3(b, c, d, a, x[10], 23, 0xbebfbc70);
+ MD5_ROUND3(a, b, c, d, x[13], 4, 0x289b7ec6);
+ MD5_ROUND3(d, a, b, c, x[ 0], 11, 0xeaa127fa);
+ MD5_ROUND3(c, d, a, b, x[ 3], 16, 0xd4ef3085);
+ MD5_ROUND3(b, c, d, a, x[ 6], 23, 0x4881d05);
+ MD5_ROUND3(a, b, c, d, x[ 9], 4, 0xd9d4d039);
+ MD5_ROUND3(d, a, b, c, x[12], 11, 0xe6db99e5);
+ MD5_ROUND3(c, d, a, b, x[15], 16, 0x1fa27cf8);
+ MD5_ROUND3(b, c, d, a, x[ 2], 23, 0xc4ac5665);
+
+ MD5_ROUND4(a, b, c, d, x[ 0], 6, 0xf4292244);
+ MD5_ROUND4(d, a, b, c, x[ 7], 10, 0x432aff97);
+ MD5_ROUND4(c, d, a, b, x[14], 15, 0xab9423a7);
+ MD5_ROUND4(b, c, d, a, x[ 5], 21, 0xfc93a039);
+ MD5_ROUND4(a, b, c, d, x[12], 6, 0x655b59c3);
+ MD5_ROUND4(d, a, b, c, x[ 3], 10, 0x8f0ccc92);
+ MD5_ROUND4(c, d, a, b, x[10], 15, 0xffeff47d);
+ MD5_ROUND4(b, c, d, a, x[ 1], 21, 0x85845dd1);
+ MD5_ROUND4(a, b, c, d, x[ 8], 6, 0x6fa87e4f);
+ MD5_ROUND4(d, a, b, c, x[15], 10, 0xfe2ce6e0);
+ MD5_ROUND4(c, d, a, b, x[ 6], 15, 0xa3014314);
+ MD5_ROUND4(b, c, d, a, x[13], 21, 0x4e0811a1);
+ MD5_ROUND4(a, b, c, d, x[ 4], 6, 0xf7537e82);
+ MD5_ROUND4(d, a, b, c, x[11], 10, 0xbd3af235);
+ MD5_ROUND4(c, d, a, b, x[ 2], 15, 0x2ad7d2bb);
+ MD5_ROUND4(b, c, d, a, x[ 9], 21, 0xeb86d391);
+
+ state[0] += a;
+ state[1] += b;
+ state[2] += c;
+ state[3] += d;
+}
+
+void rhash_md5_update(struct md5_ctx * ctx,
+ const void * pmsg,
+ size_t size)
+{
+ uint8_t * msg = (uint8_t *) pmsg;
+ uint64_t index = ctx->length & 63;
+
+ ctx->length += size;
+
+ /* fill partial block */
+ if (index) {
+ size_t left = MD5_BLOCK_SIZE - index;
+
+ le32_copy((uint8_t *) ctx->message, index, msg,
+ (size < left ? size : left));
+
+ if (size < left)
+ return;
+
+ /* process partial block */
+ rhash_md5_process_block(ctx->hash, ctx->message);
+ msg += left;
+ size -= left;
+ }
+
+ while (size >= MD5_BLOCK_SIZE) {
+ uint32_t * aligned_message_block;
+
+ le32_copy(ctx->message, 0, msg, MD5_BLOCK_SIZE);
+ aligned_message_block = ctx->message;
+
+ rhash_md5_process_block(ctx->hash, aligned_message_block);
+ msg += MD5_BLOCK_SIZE;
+ size -= MD5_BLOCK_SIZE;
+ }
+
+ if (size)
+ /* save leftovers */
+ le32_copy(ctx->message, 0, msg, size);
+}
+
+void rhash_md5_final(struct md5_ctx * ctx,
+ uint8_t * result)
+{
+ uint64_t index = (ctx->length & 63) >> 2;
+ uint64_t shift = (ctx->length & 3) * 8;
+
+ ctx->message[index] &= ~(0xFFFFFFFF << shift);
+ ctx->message[index++] ^= 0x80 << shift;
+
+ if (index > 14) {
+ while (index < 16)
+ ctx->message[index++] = 0;
+
+ rhash_md5_process_block(ctx->hash, ctx->message);
+ index = 0;
+ }
+
+ while (index < 14)
+ ctx->message[index++] = 0;
+
+ ctx->message[14] = (uint32_t) (ctx->length << 3);
+ ctx->message[15] = (uint32_t) (ctx->length >> 29);
+ rhash_md5_process_block(ctx->hash, ctx->message);
+
+ if (result)
+ le32_copy(result, 0, &ctx->hash, 16);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-04 21:16:02 +0000