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/*
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* MD4 (RFC-1320) message digest.
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* Modified from MD5 code by Andrey Panin <pazke@donpac.ru>
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*
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* Written by Solar Designer <solar@openwall.com> in 2001, and placed in
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* the public domain. There's absolutely no warranty.
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*
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* This differs from Colin Plumb's older public domain implementation in
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* that no 32-bit integer data type is required, there's no compile-time
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* endianness configuration.
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* The primary goals are portability and ease of use.
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*
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* This implementation is meant to be fast, but not as fast as possible.
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* Some known optimizations are not included to reduce source code size
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* and avoid compile-time configuration.
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*/
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#include "crypt-port.h"
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#include "alg-md4.h"
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#include "byteorder.h"
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#if INCLUDE_nthash
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/*
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* The basic MD4 functions.
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*/
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#define F(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))
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#define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
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#define H(x, y, z) ((x) ^ (y) ^ (z))
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/*
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* The MD4 transformation for all four rounds.
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*/
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#define STEP(f, a, b, c, d, x, s) \
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(a) += f((b), (c), (d)) + (x); \
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(a) = ((a) << (s)) | ((a) >> (32 - (s)))
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/*
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* SET reads 4 input bytes in little-endian byte order and stores them
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* in a properly aligned word in host byte order.
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*
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* The check for little-endian architectures which tolerate unaligned
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* memory accesses is just an optimization. Nothing will break if it
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* doesn't work.
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*/
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#define SET(n) \
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(ctx->block[(n)] = le32_to_cpu (&ptr[(n) * 4]))
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#define GET(n) \
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(ctx->block[(n)])
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/*
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* This processes one or more 64-byte data blocks, but does NOT update
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* the bit counters. There're no alignment requirements.
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*/
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static const unsigned char *
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body (struct md4_ctx *ctx, const unsigned char *data, size_t size)
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{
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const unsigned char *ptr;
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uint32_t a, b, c, d;
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uint32_t saved_a, saved_b, saved_c, saved_d;
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ptr = data;
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a = ctx->a;
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b = ctx->b;
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c = ctx->c;
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d = ctx->d;
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do
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{
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saved_a = a;
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saved_b = b;
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saved_c = c;
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saved_d = d;
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/* Round 1 */
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STEP(F, a, b, c, d, SET( 0), 3);
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STEP(F, d, a, b, c, SET( 1), 7);
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STEP(F, c, d, a, b, SET( 2), 11);
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STEP(F, b, c, d, a, SET( 3), 19);
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STEP(F, a, b, c, d, SET( 4), 3);
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STEP(F, d, a, b, c, SET( 5), 7);
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STEP(F, c, d, a, b, SET( 6), 11);
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STEP(F, b, c, d, a, SET( 7), 19);
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STEP(F, a, b, c, d, SET( 8), 3);
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STEP(F, d, a, b, c, SET( 9), 7);
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STEP(F, c, d, a, b, SET(10), 11);
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STEP(F, b, c, d, a, SET(11), 19);
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STEP(F, a, b, c, d, SET(12), 3);
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STEP(F, d, a, b, c, SET(13), 7);
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STEP(F, c, d, a, b, SET(14), 11);
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STEP(F, b, c, d, a, SET(15), 19);
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/* Round 2 */
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STEP(G, a, b, c, d, GET( 0) + 0x5A827999, 3);
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STEP(G, d, a, b, c, GET( 4) + 0x5A827999, 5);
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STEP(G, c, d, a, b, GET( 8) + 0x5A827999, 9);
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STEP(G, b, c, d, a, GET(12) + 0x5A827999, 13);
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STEP(G, a, b, c, d, GET( 1) + 0x5A827999, 3);
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STEP(G, d, a, b, c, GET( 5) + 0x5A827999, 5);
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STEP(G, c, d, a, b, GET( 9) + 0x5A827999, 9);
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STEP(G, b, c, d, a, GET(13) + 0x5A827999, 13);
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STEP(G, a, b, c, d, GET( 2) + 0x5A827999, 3);
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STEP(G, d, a, b, c, GET( 6) + 0x5A827999, 5);
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STEP(G, c, d, a, b, GET(10) + 0x5A827999, 9);
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STEP(G, b, c, d, a, GET(14) + 0x5A827999, 13);
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STEP(G, a, b, c, d, GET( 3) + 0x5A827999, 3);
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STEP(G, d, a, b, c, GET( 7) + 0x5A827999, 5);
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STEP(G, c, d, a, b, GET(11) + 0x5A827999, 9);
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STEP(G, b, c, d, a, GET(15) + 0x5A827999, 13);
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/* Round 3 */
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STEP(H, a, b, c, d, GET( 0) + 0x6ED9EBA1, 3);
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STEP(H, d, a, b, c, GET( 8) + 0x6ED9EBA1, 9);
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STEP(H, c, d, a, b, GET( 4) + 0x6ED9EBA1, 11);
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STEP(H, b, c, d, a, GET(12) + 0x6ED9EBA1, 15);
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STEP(H, a, b, c, d, GET( 2) + 0x6ED9EBA1, 3);
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STEP(H, d, a, b, c, GET(10) + 0x6ED9EBA1, 9);
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STEP(H, c, d, a, b, GET( 6) + 0x6ED9EBA1, 11);
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STEP(H, b, c, d, a, GET(14) + 0x6ED9EBA1, 15);
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STEP(H, a, b, c, d, GET( 1) + 0x6ED9EBA1, 3);
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STEP(H, d, a, b, c, GET( 9) + 0x6ED9EBA1, 9);
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STEP(H, c, d, a, b, GET( 5) + 0x6ED9EBA1, 11);
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STEP(H, b, c, d, a, GET(13) + 0x6ED9EBA1, 15);
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STEP(H, a, b, c, d, GET( 3) + 0x6ED9EBA1, 3);
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STEP(H, d, a, b, c, GET(11) + 0x6ED9EBA1, 9);
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STEP(H, c, d, a, b, GET( 7) + 0x6ED9EBA1, 11);
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STEP(H, b, c, d, a, GET(15) + 0x6ED9EBA1, 15);
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a += saved_a;
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b += saved_b;
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c += saved_c;
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d += saved_d;
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ptr += 64;
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}
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while (size -= 64);
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ctx->a = a;
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ctx->b = b;
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ctx->c = c;
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ctx->d = d;
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return ptr;
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}
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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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md4_read_ctx (struct md4_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(struct md4_ctx));
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return resbuf;
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}
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|
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void
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md4_init_ctx (struct md4_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->lo = 0;
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ctx->hi = 0;
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}
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void
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md4_process_bytes (const void *buffer, struct md4_ctx *ctx, size_t size)
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{
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uint32_t saved_lo;
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size_t used, free;
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saved_lo = ctx->lo;
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if ((ctx->lo = (saved_lo + size) & 0x1fffffff) < saved_lo)
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ctx->hi++;
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ctx->hi += (uint32_t)(size >> 29);
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used = saved_lo & 0x3f;
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if (used)
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{
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free = 64 - used;
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if (size < free)
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{
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memcpy(&ctx->buffer[used], buffer, size);
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return;
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}
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|
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memcpy(&ctx->buffer[used], buffer, free);
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buffer = (const unsigned char *) buffer + free;
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size -= free;
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body(ctx, ctx->buffer, 64);
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}
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|
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if (size >= 64)
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{
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buffer = body(ctx, buffer, size & ~(uint32_t)0x3f);
|
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size &= 0x3f;
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}
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13e0ca |
|
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memcpy(ctx->buffer, buffer, size);
|
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13e0ca |
}
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|
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void *
|
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md4_finish_ctx (struct md4_ctx *ctx, void *resbuf)
|
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{
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13e0ca |
size_t used, free;
|
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13e0ca |
|
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used = ctx->lo & 0x3f;
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13e0ca |
|
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ctx->buffer[used++] = 0x80;
|
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13e0ca |
|
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free = 64 - used;
|
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13e0ca |
|
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13e0ca |
if (free < 8)
|
|
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{
|
|
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13e0ca |
XCRYPT_SECURE_MEMSET (&ctx->buffer[used], free);
|
|
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13e0ca |
body(ctx, ctx->buffer, 64);
|
|
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used = 0;
|
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free = 64;
|
|
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13e0ca |
}
|
|
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13e0ca |
|
|
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13e0ca |
XCRYPT_SECURE_MEMSET (&ctx->buffer[used], free - 8);
|
|
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13e0ca |
|
|
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13e0ca |
ctx->lo <<= 3;
|
|
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13e0ca |
ctx->buffer[56] = (unsigned char)((ctx->lo) & 0xff);
|
|
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13e0ca |
ctx->buffer[57] = (unsigned char)((ctx->lo >> 8) & 0xff);
|
|
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13e0ca |
ctx->buffer[58] = (unsigned char)((ctx->lo >> 16) & 0xff);
|
|
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13e0ca |
ctx->buffer[59] = (unsigned char)((ctx->lo >> 24) & 0xff);
|
|
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13e0ca |
ctx->buffer[60] = (unsigned char)((ctx->hi) & 0xff);
|
|
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13e0ca |
ctx->buffer[61] = (unsigned char)((ctx->hi >> 8) & 0xff);
|
|
Packit |
13e0ca |
ctx->buffer[62] = (unsigned char)((ctx->hi >> 16) & 0xff);
|
|
Packit |
13e0ca |
ctx->buffer[63] = (unsigned char)((ctx->hi >> 24) & 0xff);
|
|
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13e0ca |
|
|
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13e0ca |
body(ctx, ctx->buffer, 64);
|
|
Packit |
13e0ca |
|
|
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13e0ca |
return md4_read_ctx (ctx, resbuf);
|
|
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13e0ca |
}
|
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13e0ca |
|
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13e0ca |
#endif
|