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/* Functions to compute MD5 message digest of files or memory blocks.
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according to the definition of MD5 in RFC 1321 from April 1992.
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Copyright (C) 1995-2017 Free Software Foundation, Inc.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public License
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as published by the Free Software Foundation; either version 2.1 of
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the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995. */
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#include "crypt-port.h"
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#include "alg-md5.h"
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#include "byteorder.h"
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#if INCLUDE_md5 || INCLUDE_sunmd5
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static void md5_process_block (const void *buffer, size_t len,
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struct md5_ctx *ctx);
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/* Initialize structure containing state of computation.
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(RFC 1321, 3.3: Step 3) */
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void
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md5_init_ctx (struct md5_ctx *ctx)
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{
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ctx->A = 0x67452301;
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ctx->B = 0xefcdab89;
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ctx->C = 0x98badcfe;
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ctx->D = 0x10325476;
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ctx->total = 0;
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ctx->buflen = 0;
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}
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/* Put result from CTX in first 16 bytes following RESBUF. The result
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will be in little endian byte order. */
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static void *
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md5_read_ctx (struct md5_ctx *ctx, void *resbuf)
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{
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unsigned char *buf = resbuf;
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cpu_to_le32 (buf + 0, ctx->A);
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cpu_to_le32 (buf + 4, ctx->B);
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cpu_to_le32 (buf + 8, ctx->C);
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cpu_to_le32 (buf + 12, ctx->D);
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XCRYPT_SECURE_MEMSET (ctx, sizeof(*ctx));
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return resbuf;
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}
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/* Process the remaining bytes in the internal buffer and the usual
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prolog according to the standard and write the result to RESBUF. */
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void *
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md5_finish_ctx (struct md5_ctx *ctx, void *resbuf)
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{
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/* Take yet unprocessed bytes into account. */
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uint32_t bytes = ctx->buflen;
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size_t pad;
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/* Now count remaining bytes. */
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ctx->total += bytes;
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pad = bytes >= 56 ? 64 + 56 - bytes : 56 - bytes;
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/* The first byte of padding should be 0x80 and the rest should be
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zero. (RFC 1321, 3.1: Step 1) */
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ctx->buffer[bytes] = 0x80u;
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XCRYPT_SECURE_MEMSET (&ctx->buffer[bytes+1], pad-1);
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/* Put the 64-bit file length in little-endian *bits* at the end of
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the buffer. */
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cpu_to_le64 (&ctx->buffer[bytes + pad], ctx->total << 3);
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/* Process last bytes. */
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md5_process_block (ctx->buffer, bytes + pad + 8, ctx);
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return md5_read_ctx (ctx, resbuf);
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}
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void
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md5_process_bytes (const void *buffer, size_t len, struct md5_ctx *ctx)
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{
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/* When we already have some bits in our internal buffer concatenate
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both inputs first. */
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if (ctx->buflen != 0)
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{
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uint32_t left_over = ctx->buflen;
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uint32_t add = 128 - left_over > len ? (uint32_t)len : 128 - left_over;
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memcpy (&ctx->buffer[left_over], buffer, add);
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ctx->buflen += add;
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if (ctx->buflen > 64)
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{
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md5_process_block (ctx->buffer, ctx->buflen & ~63u, ctx);
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ctx->buflen &= 63;
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/* The regions in the following copy operation cannot overlap. */
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memcpy (ctx->buffer, &ctx->buffer[(left_over + add) & ~63u],
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ctx->buflen);
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}
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buffer = (const char *) buffer + add;
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len -= add;
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}
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/* Process available complete blocks. */
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if (len > 64)
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{
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md5_process_block (buffer, len & ~63u, ctx);
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buffer = (const char *) buffer + (len & ~63u);
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len &= 63;
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}
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/* Move remaining bytes in internal buffer. */
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if (len > 0)
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{
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uint32_t left_over = ctx->buflen;
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memcpy (&ctx->buffer[left_over], buffer, len);
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left_over += (uint32_t)len;
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if (left_over >= 64)
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{
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md5_process_block (ctx->buffer, 64, ctx);
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left_over -= 64;
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memcpy (ctx->buffer, &ctx->buffer[64], left_over);
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}
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ctx->buflen = left_over;
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}
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}
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/* These are the four functions used in the four steps of the MD5 algorithm
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and defined in the RFC 1321. The first function is a little bit optimized
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(as found in Colin Plumbs public domain implementation). */
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/* #define FF(b, c, d) ((b & c) | (~b & d)) */
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#define FF(b, c, d) (d ^ (b & (c ^ d)))
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#define FG(b, c, d) FF (d, b, c)
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#define FH(b, c, d) (b ^ c ^ d)
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#define FI(b, c, d) (c ^ (b | ~d))
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/* Process LEN bytes of BUFFER, accumulating context into CTX.
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It is assumed that LEN % 64 == 0. */
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static void
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md5_process_block (const void *buffer, size_t len, struct md5_ctx *ctx)
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{
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const unsigned char *p = buffer;
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const unsigned char *endp = p + len;
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uint32_t A = ctx->A;
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uint32_t B = ctx->B;
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uint32_t C = ctx->C;
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uint32_t D = ctx->D;
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/* First increment the byte count. RFC 1321 specifies the possible
|
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length of the file up to 2^64 bits. Here we only compute the
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number of bytes. */
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ctx->total += len;
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/* Process all bytes in the buffer with 64 bytes in each round of
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the loop. */
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while (p < endp)
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{
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uint32_t *cwp = ctx->correct_words;
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uint32_t A_save = A;
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uint32_t B_save = B;
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uint32_t C_save = C;
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uint32_t D_save = D;
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/* First round: using the given function, the context and a constant
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the next context is computed. Because the algorithms processing
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unit is a 32-bit word and it is determined to work on words in
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little endian byte order we perhaps have to change the byte order
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before the computation. To reduce the work for the next steps
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we store the swapped words in the array CORRECT_WORDS. */
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#define OP(a, b, c, d, s, T) \
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do \
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{ \
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uint32_t word = le32_to_cpu (p); \
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p += 4; \
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*cwp++ = word; \
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a += FF (b, c, d) + word + T; \
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CYCLIC (a, s); \
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a += b; \
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} \
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while (0)
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|
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/* It is unfortunate that C does not provide an operator for
|
|
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cyclic rotation. Hope the C compiler is smart enough. */
|
|
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#define CYCLIC(w, s) (w = (w << s) | (w >> (32 - s)))
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|
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/* Before we start, one word to the strange constants.
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They are defined in RFC 1321 as
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|
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|
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T[i] = (int) (4294967296.0 * fabs (sin (i))), i=1..64
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*/
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|
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/* Round 1. */
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OP (A, B, C, D, 7, 0xd76aa478);
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OP (D, A, B, C, 12, 0xe8c7b756);
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OP (C, D, A, B, 17, 0x242070db);
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OP (B, C, D, A, 22, 0xc1bdceee);
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OP (A, B, C, D, 7, 0xf57c0faf);
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OP (D, A, B, C, 12, 0x4787c62a);
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OP (C, D, A, B, 17, 0xa8304613);
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OP (B, C, D, A, 22, 0xfd469501);
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OP (A, B, C, D, 7, 0x698098d8);
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OP (D, A, B, C, 12, 0x8b44f7af);
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OP (C, D, A, B, 17, 0xffff5bb1);
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OP (B, C, D, A, 22, 0x895cd7be);
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OP (A, B, C, D, 7, 0x6b901122);
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OP (D, A, B, C, 12, 0xfd987193);
|
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OP (C, D, A, B, 17, 0xa679438e);
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OP (B, C, D, A, 22, 0x49b40821);
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|
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/* For the second to fourth round we have the possibly swapped words
|
|
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in CORRECT_WORDS. Redefine the macro to take an additional first
|
|
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argument specifying the function to use. */
|
|
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#undef OP
|
|
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#define OP(f, a, b, c, d, k, s, T) \
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do \
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{ \
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|
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a += f (b, c, d) + ctx->correct_words[k] + T; \
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CYCLIC (a, s); \
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a += b; \
|
|
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} \
|
|
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while (0)
|
|
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13e0ca |
|
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/* Round 2. */
|
|
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OP (FG, A, B, C, D, 1, 5, 0xf61e2562);
|
|
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OP (FG, D, A, B, C, 6, 9, 0xc040b340);
|
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OP (FG, C, D, A, B, 11, 14, 0x265e5a51);
|
|
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13e0ca |
OP (FG, B, C, D, A, 0, 20, 0xe9b6c7aa);
|
|
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13e0ca |
OP (FG, A, B, C, D, 5, 5, 0xd62f105d);
|
|
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13e0ca |
OP (FG, D, A, B, C, 10, 9, 0x02441453);
|
|
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13e0ca |
OP (FG, C, D, A, B, 15, 14, 0xd8a1e681);
|
|
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13e0ca |
OP (FG, B, C, D, A, 4, 20, 0xe7d3fbc8);
|
|
Packit |
13e0ca |
OP (FG, A, B, C, D, 9, 5, 0x21e1cde6);
|
|
Packit |
13e0ca |
OP (FG, D, A, B, C, 14, 9, 0xc33707d6);
|
|
Packit |
13e0ca |
OP (FG, C, D, A, B, 3, 14, 0xf4d50d87);
|
|
Packit |
13e0ca |
OP (FG, B, C, D, A, 8, 20, 0x455a14ed);
|
|
Packit |
13e0ca |
OP (FG, A, B, C, D, 13, 5, 0xa9e3e905);
|
|
Packit |
13e0ca |
OP (FG, D, A, B, C, 2, 9, 0xfcefa3f8);
|
|
Packit |
13e0ca |
OP (FG, C, D, A, B, 7, 14, 0x676f02d9);
|
|
Packit |
13e0ca |
OP (FG, B, C, D, A, 12, 20, 0x8d2a4c8a);
|
|
Packit |
13e0ca |
|
|
Packit |
13e0ca |
/* Round 3. */
|
|
Packit |
13e0ca |
OP (FH, A, B, C, D, 5, 4, 0xfffa3942);
|
|
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13e0ca |
OP (FH, D, A, B, C, 8, 11, 0x8771f681);
|
|
Packit |
13e0ca |
OP (FH, C, D, A, B, 11, 16, 0x6d9d6122);
|
|
Packit |
13e0ca |
OP (FH, B, C, D, A, 14, 23, 0xfde5380c);
|
|
Packit |
13e0ca |
OP (FH, A, B, C, D, 1, 4, 0xa4beea44);
|
|
Packit |
13e0ca |
OP (FH, D, A, B, C, 4, 11, 0x4bdecfa9);
|
|
Packit |
13e0ca |
OP (FH, C, D, A, B, 7, 16, 0xf6bb4b60);
|
|
Packit |
13e0ca |
OP (FH, B, C, D, A, 10, 23, 0xbebfbc70);
|
|
Packit |
13e0ca |
OP (FH, A, B, C, D, 13, 4, 0x289b7ec6);
|
|
Packit |
13e0ca |
OP (FH, D, A, B, C, 0, 11, 0xeaa127fa);
|
|
Packit |
13e0ca |
OP (FH, C, D, A, B, 3, 16, 0xd4ef3085);
|
|
Packit |
13e0ca |
OP (FH, B, C, D, A, 6, 23, 0x04881d05);
|
|
Packit |
13e0ca |
OP (FH, A, B, C, D, 9, 4, 0xd9d4d039);
|
|
Packit |
13e0ca |
OP (FH, D, A, B, C, 12, 11, 0xe6db99e5);
|
|
Packit |
13e0ca |
OP (FH, C, D, A, B, 15, 16, 0x1fa27cf8);
|
|
Packit |
13e0ca |
OP (FH, B, C, D, A, 2, 23, 0xc4ac5665);
|
|
Packit |
13e0ca |
|
|
Packit |
13e0ca |
/* Round 4. */
|
|
Packit |
13e0ca |
OP (FI, A, B, C, D, 0, 6, 0xf4292244);
|
|
Packit |
13e0ca |
OP (FI, D, A, B, C, 7, 10, 0x432aff97);
|
|
Packit |
13e0ca |
OP (FI, C, D, A, B, 14, 15, 0xab9423a7);
|
|
Packit |
13e0ca |
OP (FI, B, C, D, A, 5, 21, 0xfc93a039);
|
|
Packit |
13e0ca |
OP (FI, A, B, C, D, 12, 6, 0x655b59c3);
|
|
Packit |
13e0ca |
OP (FI, D, A, B, C, 3, 10, 0x8f0ccc92);
|
|
Packit |
13e0ca |
OP (FI, C, D, A, B, 10, 15, 0xffeff47d);
|
|
Packit |
13e0ca |
OP (FI, B, C, D, A, 1, 21, 0x85845dd1);
|
|
Packit |
13e0ca |
OP (FI, A, B, C, D, 8, 6, 0x6fa87e4f);
|
|
Packit |
13e0ca |
OP (FI, D, A, B, C, 15, 10, 0xfe2ce6e0);
|
|
Packit |
13e0ca |
OP (FI, C, D, A, B, 6, 15, 0xa3014314);
|
|
Packit |
13e0ca |
OP (FI, B, C, D, A, 13, 21, 0x4e0811a1);
|
|
Packit |
13e0ca |
OP (FI, A, B, C, D, 4, 6, 0xf7537e82);
|
|
Packit |
13e0ca |
OP (FI, D, A, B, C, 11, 10, 0xbd3af235);
|
|
Packit |
13e0ca |
OP (FI, C, D, A, B, 2, 15, 0x2ad7d2bb);
|
|
Packit |
13e0ca |
OP (FI, B, C, D, A, 9, 21, 0xeb86d391);
|
|
Packit |
13e0ca |
|
|
Packit |
13e0ca |
/* Add the starting values of the context. */
|
|
Packit |
13e0ca |
A += A_save;
|
|
Packit |
13e0ca |
B += B_save;
|
|
Packit |
13e0ca |
C += C_save;
|
|
Packit |
13e0ca |
D += D_save;
|
|
Packit |
13e0ca |
}
|
|
Packit |
13e0ca |
|
|
Packit |
13e0ca |
/* Put checksum in context given as argument. */
|
|
Packit |
13e0ca |
ctx->A = A;
|
|
Packit |
13e0ca |
ctx->B = B;
|
|
Packit |
13e0ca |
ctx->C = C;
|
|
Packit |
13e0ca |
ctx->D = D;
|
|
Packit |
13e0ca |
}
|
|
Packit |
13e0ca |
|
|
Packit |
13e0ca |
#endif
|