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/* vi: set sw=4 ts=4: */
/*
* Based on shasum from http://www.netsw.org/crypto/hash/
* Majorly hacked up to use Dr Brian Gladman's sha1 code
*
* Copyright (C) 2002 Dr Brian Gladman <brg@gladman.me.uk>, Worcester, UK.
* Copyright (C) 2003 Glenn L. McGrath
* Copyright (C) 2003 Erik Andersen
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*
* ---------------------------------------------------------------------------
* Issue Date: 10/11/2002
*
* This is a byte oriented version of SHA1 that operates on arrays of bytes
* stored in memory. It runs at 22 cycles per byte on a Pentium P4 processor
*
* ---------------------------------------------------------------------------
*/
#include "abrtlib.h"
#if defined(__BIG_ENDIAN__) && __BIG_ENDIAN__
# define SHA1_BIG_ENDIAN 1
# define SHA1_LITTLE_ENDIAN 0
#elif __BYTE_ORDER == __BIG_ENDIAN
# define SHA1_BIG_ENDIAN 1
# define SHA1_LITTLE_ENDIAN 0
#elif __BYTE_ORDER == __LITTLE_ENDIAN
# define SHA1_BIG_ENDIAN 0
# define SHA1_LITTLE_ENDIAN 1
#else
# error "Can't determine endianness"
#endif
#define rotl32(x,n) (((x) << (n)) | ((x) >> (32 - (n))))
#define rotr32(x,n) (((x) >> (n)) | ((x) << (32 - (n))))
/* for sha512: */
#define rotr64(x,n) (((x) >> (n)) | ((x) << (64 - (n))))
#if SHA1_LITTLE_ENDIAN
static inline uint64_t hton64(uint64_t v)
{
return (((uint64_t)htonl(v)) << 32) | htonl(v >> 32);
}
#else
#define hton64(v) (v)
#endif
#define ntoh64(v) hton64(v)
/* To check alignment gcc has an appropriate operator. Other
compilers don't. */
#if defined(__GNUC__) && __GNUC__ >= 2
# define UNALIGNED_P(p,type) (((uintptr_t) p) % __alignof__(type) != 0)
#else
# define UNALIGNED_P(p,type) (((uintptr_t) p) % sizeof(type) != 0)
#endif
/* Some arch headers have conflicting defines */
#undef ch
#undef parity
#undef maj
#undef rnd
static void sha1_process_block64(sha1_ctx_t *ctx)
{
unsigned t;
uint32_t W[80], a, b, c, d, e;
const uint32_t *words = (uint32_t*) ctx->wbuffer;
for (t = 0; t < 16; ++t) {
W[t] = ntohl(*words);
words++;
}
for (/*t = 16*/; t < 80; ++t) {
uint32_t T = W[t - 3] ^ W[t - 8] ^ W[t - 14] ^ W[t - 16];
W[t] = rotl32(T, 1);
}
a = ctx->hash[0];
b = ctx->hash[1];
c = ctx->hash[2];
d = ctx->hash[3];
e = ctx->hash[4];
/* Reverse byte order in 32-bit words */
#define ch(x,y,z) ((z) ^ ((x) & ((y) ^ (z))))
#define parity(x,y,z) ((x) ^ (y) ^ (z))
#define maj(x,y,z) (((x) & (y)) | ((z) & ((x) | (y))))
/* 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) \
do { \
uint32_t T = a; \
a = rotl32(a, 5) + f(b, c, d) + e + k + W[t]; \
e = d; \
d = c; \
c = rotl32(b, 30); \
b = T; \
} while (0)
for (t = 0; t < 20; ++t)
rnd(ch, 0x5a827999);
for (/*t = 20*/; t < 40; ++t)
rnd(parity, 0x6ed9eba1);
for (/*t = 40*/; t < 60; ++t)
rnd(maj, 0x8f1bbcdc);
for (/*t = 60*/; t < 80; ++t)
rnd(parity, 0xca62c1d6);
#undef ch
#undef parity
#undef maj
#undef rnd
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_t *ctx)
{
ctx->hash[0] = 0x67452301;
ctx->hash[1] = 0xefcdab89;
ctx->hash[2] = 0x98badcfe;
ctx->hash[3] = 0x10325476;
ctx->hash[4] = 0xc3d2e1f0;
ctx->total64 = 0;
ctx->process_block = sha1_process_block64;
}
static const uint32_t init256[] = {
0x6a09e667,
0xbb67ae85,
0x3c6ef372,
0xa54ff53a,
0x510e527f,
0x9b05688c,
0x1f83d9ab,
0x5be0cd19
};
static const uint32_t init512_lo[] = {
0xf3bcc908,
0x84caa73b,
0xfe94f82b,
0x5f1d36f1,
0xade682d1,
0x2b3e6c1f,
0xfb41bd6b,
0x137e2179
};
/* Used also for sha256 */
void sha1_hash(const void *buffer, size_t len, sha1_ctx_t *ctx)
{
unsigned in_buf = ctx->total64 & 63;
unsigned add = 64 - in_buf;
ctx->total64 += len;
while (len >= add) { /* transfer whole blocks while possible */
memcpy(ctx->wbuffer + in_buf, buffer, add);
buffer = (const char *)buffer + add;
len -= add;
add = 64;
in_buf = 0;
ctx->process_block(ctx);
}
memcpy(ctx->wbuffer + in_buf, buffer, len);
}
/* Used also for sha256 */
void sha1_end(void *resbuf, sha1_ctx_t *ctx)
{
unsigned pad, in_buf;
in_buf = ctx->total64 & 63;
/* Pad the buffer to the next 64-byte boundary with 0x80,0,0,0... */
ctx->wbuffer[in_buf++] = 0x80;
/* This loop iterates either once or twice, no more, no less */
while (1) {
pad = 64 - in_buf;
memset(ctx->wbuffer + in_buf, 0, pad);
in_buf = 0;
/* Do we have enough space for the length count? */
if (pad >= 8) {
/* Store the 64-bit counter of bits in the buffer in BE format */
uint64_t t = ctx->total64 << 3;
t = hton64(t);
/* wbuffer is suitably aligned for this */
*(uint64_t *) (&ctx->wbuffer[64 - 8]) = t;
}
ctx->process_block(ctx);
if (pad >= 8)
break;
}
in_buf = (ctx->process_block == sha1_process_block64) ? 5 : 8;
/* This way we do not impose alignment constraints on resbuf: */
if (SHA1_LITTLE_ENDIAN) {
unsigned i;
for (i = 0; i < in_buf; ++i)
ctx->hash[i] = htonl(ctx->hash[i]);
}
memcpy(resbuf, ctx->hash, sizeof(ctx->hash[0]) * in_buf);
}
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