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#include <string.h>
#include "sha1.h"
#define SHA_LITTLE_ENDIAN 1234 /* byte 0 is least significant (i386) */
#define SHA_BIG_ENDIAN 4321 /* byte 0 is most significant (mc68k) */
#include <sys/param.h>
#ifndef BYTE_ORDER
#error "BYTE_ORDER not defined"
#endif
#if BYTE_ORDER != BIG_ENDIAN
#define PLATFORM_BYTE_ORDER SHA_LITTLE_ENDIAN
#else
#define PLATFORM_BYTE_ORDER SHA_BIG_ENDIAN
#endif
#if !defined(PLATFORM_BYTE_ORDER)
# error Please set undetermined byte order (lines 87 or 89 of sha1.c).
#endif
#define rotl32(x,n) (((x) << n) | ((x) >> (32 - n)))
#if (PLATFORM_BYTE_ORDER == SHA_BIG_ENDIAN)
#define swap_b32(x) (x)
#elif defined(bswap_32)
#define swap_b32(x) bswap_32(x)
#else
#define swap_b32(x) ((rotl32((x), 8) & 0x00ff00ff) | (rotl32((x), 24) & 0xff00ff00))
#endif
#define SHA1_MASK (SHA1_BLOCK_SIZE - 1)
/* reverse byte order in 32-bit words */
#define ch(x,y,z) (((x) & (y)) ^ (~(x) & (z)))
#define parity(x,y,z) ((x) ^ (y) ^ (z))
#define maj(x,y,z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
/* A normal version as set out in the FIPS. This version uses */
/* partial loop unrolling and is optimised for the Pentium 4 */
#define rnd(f,k) \
t = a; a = rotl32(a,5) + f(b,c,d) + e + k + w[i]; \
e = d; d = c; c = rotl32(b, 30); b = t
void sha1_compile(sha1_ctx ctx[1])
{ sha1_32t w[80], i, a, b, c, d, e, t;
/* note that words are compiled from the buffer into 32-bit */
/* words in big-endian order so an order reversal is needed */
/* here on little endian machines */
for(i = 0; i < SHA1_BLOCK_SIZE / 4; ++i)
w[i] = swap_b32(ctx->wbuf[i]);
for(i = SHA1_BLOCK_SIZE / 4; i < 80; ++i)
w[i] = rotl32(w[i - 3] ^ w[i - 8] ^ w[i - 14] ^ w[i - 16], 1);
a = ctx->hash[0];
b = ctx->hash[1];
c = ctx->hash[2];
d = ctx->hash[3];
e = ctx->hash[4];
for(i = 0; i < 20; ++i)
{
rnd(ch, 0x5a827999);
}
for(i = 20; i < 40; ++i)
{
rnd(parity, 0x6ed9eba1);
}
for(i = 40; i < 60; ++i)
{
rnd(maj, 0x8f1bbcdc);
}
for(i = 60; i < 80; ++i)
{
rnd(parity, 0xca62c1d6);
}
ctx->hash[0] += a;
ctx->hash[1] += b;
ctx->hash[2] += c;
ctx->hash[3] += d;
ctx->hash[4] += e;
}
void sha1_begin(sha1_ctx ctx[1])
{
ctx->count[0] = ctx->count[1] = 0;
ctx->hash[0] = 0x67452301;
ctx->hash[1] = 0xefcdab89;
ctx->hash[2] = 0x98badcfe;
ctx->hash[3] = 0x10325476;
ctx->hash[4] = 0xc3d2e1f0;
}
/* SHA1 hash data in an array of bytes into hash buffer and call the */
/* hash_compile function as required. */
void sha1_hash(const unsigned char data[], unsigned int len, sha1_ctx ctx[1])
{ sha1_32t pos = (sha1_32t)(ctx->count[0] & SHA1_MASK),
space = SHA1_BLOCK_SIZE - pos;
const unsigned char *sp = data;
if((ctx->count[0] += len) < len)
++(ctx->count[1]);
while(len >= space) /* tranfer whole blocks while possible */
{
memcpy(((unsigned char*)ctx->wbuf) + pos, sp, space);
sp += space; len -= space; space = SHA1_BLOCK_SIZE; pos = 0;
sha1_compile(ctx);
}
memcpy(((unsigned char*)ctx->wbuf) + pos, sp, len);
}
/* SHA1 final padding and digest calculation */
#if (PLATFORM_BYTE_ORDER == SHA_LITTLE_ENDIAN)
sha1_32t mask[4] =
{ 0x00000000, 0x000000ff, 0x0000ffff, 0x00ffffff };
sha1_32t bits[4] =
{ 0x00000080, 0x00008000, 0x00800000, 0x80000000 };
#else
sha1_32t mask[4] =
{ 0x00000000, 0xff000000, 0xffff0000, 0xffffff00 };
sha1_32t bits[4] =
{ 0x80000000, 0x00800000, 0x00008000, 0x00000080 };
#endif
void sha1_end(unsigned char hval[], sha1_ctx ctx[1])
{ sha1_32t i = (sha1_32t)(ctx->count[0] & SHA1_MASK);
/* mask out the rest of any partial 32-bit word and then set */
/* the next byte to 0x80. On big-endian machines any bytes in */
/* the buffer will be at the top end of 32 bit words, on little */
/* endian machines they will be at the bottom. Hence the AND */
/* and OR masks above are reversed for little endian systems */
/* Note that we can always add the first padding byte at this */
/* because the buffer always contains at least one empty slot */
ctx->wbuf[i >> 2] = (ctx->wbuf[i >> 2] & mask[i & 3]) | bits[i & 3];
/* we need 9 or more empty positions, one for the padding byte */
/* (above) and eight for the length count. If there is not */
/* enough space pad and empty the buffer */
if(i > SHA1_BLOCK_SIZE - 9)
{
if(i < 60) ctx->wbuf[15] = 0;
sha1_compile(ctx);
i = 0;
}
else /* compute a word index for the empty buffer positions */
i = (i >> 2) + 1;
while(i < 14) /* and zero pad all but last two positions */
ctx->wbuf[i++] = 0;
/* assemble the eight byte counter in in big-endian format */
ctx->wbuf[14] = swap_b32((ctx->count[1] << 3) | (ctx->count[0] >> 29));
ctx->wbuf[15] = swap_b32(ctx->count[0] << 3);
sha1_compile(ctx);
/* extract the hash value as bytes in case the hash buffer is */
/* misaligned for 32-bit words */
for(i = 0; i < SHA1_DIGEST_SIZE; ++i)
hval[i] = (unsigned char)(ctx->hash[i >> 2] >> 8 * (~i & 3));
}
void sha1(unsigned char hval[], const unsigned char data[], unsigned int len)
{ sha1_ctx cx[1];
sha1_begin(cx); sha1_hash(data, len, cx); sha1_end(hval, cx);
}
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