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notmuch/lib/libsha1.c
David Bremner b9f0e6923d util: detect byte order 
Unfortunately old versions of GCC and clang do not provide byte order
macros, so we re-invent them.

If UTIL_BYTE_ORDER is not defined or defined to 0, we fall back to
macros supported by recent versions of GCC and clang
2013-11-27 07:43:29 -04:00

244 lines
8.1 KiB
C
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/*
---------------------------------------------------------------------------
Copyright (c) 2002, Dr Brian Gladman, Worcester, UK. All rights reserved.
LICENSE TERMS
The free distribution and use of this software in both source and binary
form is allowed (with or without changes) provided that:
1. distributions of this source code include the above copyright
notice, this list of conditions and the following disclaimer;
2. distributions in binary form include the above copyright
notice, this list of conditions and the following disclaimer
in the documentation and/or other associated materials;
3. the copyright holder's name is not used to endorse products
built using this software without specific written permission.
ALTERNATIVELY, provided that this notice is retained in full, this product
may be distributed under the terms of the GNU General Public License (GPL),
in which case the provisions of the GPL apply INSTEAD OF those given above.
DISCLAIMER
This software is provided 'as is' with no explicit or implied warranties
in respect of its properties, including, but not limited to, correctness
and/or fitness for purpose.
---------------------------------------------------------------------------
Issue Date: 01/08/2005
This is a byte oriented version of SHA1 that operates on arrays of bytes
stored in memory.
*/
#include <string.h> /* for memcpy() etc. */
#include "endian-util.h"
#include "libsha1.h"
#if defined(__cplusplus)
extern "C"
{
#endif
#define SHA1_BLOCK_SIZE 64
#define rotl32(x,n) (((x) << n) | ((x) >> (32 - n)))
#define rotr32(x,n) (((x) >> n) | ((x) << (32 - n)))
#define bswap_32(x) ((rotr32((x), 24) & 0x00ff00ff) | (rotr32((x), 8) & 0xff00ff00))
#if (UTIL_BYTE_ORDER == UTIL_ORDER_LITTLE_ENDIAN)
# define bsw_32(p,n) \
{ int _i = (n); while(_i--) ((uint32_t*)p)[_i] = bswap_32(((uint32_t*)p)[_i]); }
#elif (UTIL_BYTE_ORDER == UTIL_ORDER_BIG_ENDIAN)
# define bsw_32(p,n)
#else
# error "Unsupported byte order"
#endif
#define SHA1_MASK (SHA1_BLOCK_SIZE - 1)
#if 0
#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)))
#else /* Discovered by Rich Schroeppel and Colin Plumb */
#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))))
#endif
/* Compile 64 bytes of hash data into SHA1 context. Note */
/* that this routine assumes that the byte order in the */
/* ctx->wbuf[] at this point is in such an order that low */
/* address bytes in the ORIGINAL byte stream will go in */
/* this buffer to the high end of 32-bit words on BOTH big */
/* and little endian systems */
#ifdef ARRAY
#define q(v,n) v[n]
#else
#define q(v,n) v##n
#endif
#define one_cycle(v,a,b,c,d,e,f,k,h) \
q(v,e) += rotr32(q(v,a),27) + \
f(q(v,b),q(v,c),q(v,d)) + k + h; \
q(v,b) = rotr32(q(v,b), 2)
#define five_cycle(v,f,k,i) \
one_cycle(v, 0,1,2,3,4, f,k,hf(i )); \
one_cycle(v, 4,0,1,2,3, f,k,hf(i+1)); \
one_cycle(v, 3,4,0,1,2, f,k,hf(i+2)); \
one_cycle(v, 2,3,4,0,1, f,k,hf(i+3)); \
one_cycle(v, 1,2,3,4,0, f,k,hf(i+4))
static void sha1_compile(sha1_ctx ctx[1])
{ uint32_t *w = ctx->wbuf;
#ifdef ARRAY
uint32_t v[5];
memcpy(v, ctx->hash, 5 * sizeof(uint32_t));
#else
uint32_t v0, v1, v2, v3, v4;
v0 = ctx->hash[0]; v1 = ctx->hash[1];
v2 = ctx->hash[2]; v3 = ctx->hash[3];
v4 = ctx->hash[4];
#endif
#define hf(i) w[i]
five_cycle(v, ch, 0x5a827999, 0);
five_cycle(v, ch, 0x5a827999, 5);
five_cycle(v, ch, 0x5a827999, 10);
one_cycle(v,0,1,2,3,4, ch, 0x5a827999, hf(15)); \
#undef hf
#define hf(i) (w[(i) & 15] = rotl32( \
w[((i) + 13) & 15] ^ w[((i) + 8) & 15] \
^ w[((i) + 2) & 15] ^ w[(i) & 15], 1))
one_cycle(v,4,0,1,2,3, ch, 0x5a827999, hf(16));
one_cycle(v,3,4,0,1,2, ch, 0x5a827999, hf(17));
one_cycle(v,2,3,4,0,1, ch, 0x5a827999, hf(18));
one_cycle(v,1,2,3,4,0, ch, 0x5a827999, hf(19));
five_cycle(v, parity, 0x6ed9eba1, 20);
five_cycle(v, parity, 0x6ed9eba1, 25);
five_cycle(v, parity, 0x6ed9eba1, 30);
five_cycle(v, parity, 0x6ed9eba1, 35);
five_cycle(v, maj, 0x8f1bbcdc, 40);
five_cycle(v, maj, 0x8f1bbcdc, 45);
five_cycle(v, maj, 0x8f1bbcdc, 50);
five_cycle(v, maj, 0x8f1bbcdc, 55);
five_cycle(v, parity, 0xca62c1d6, 60);
five_cycle(v, parity, 0xca62c1d6, 65);
five_cycle(v, parity, 0xca62c1d6, 70);
five_cycle(v, parity, 0xca62c1d6, 75);
#ifdef ARRAY
ctx->hash[0] += v[0]; ctx->hash[1] += v[1];
ctx->hash[2] += v[2]; ctx->hash[3] += v[3];
ctx->hash[4] += v[4];
#else
ctx->hash[0] += v0; ctx->hash[1] += v1;
ctx->hash[2] += v2; ctx->hash[3] += v3;
ctx->hash[4] += v4;
#endif
}
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 long len, sha1_ctx ctx[1])
{ uint32_t pos = (uint32_t)(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) /* transfer whole blocks if possible */
{
memcpy(((unsigned char*)ctx->wbuf) + pos, sp, space);
sp += space; len -= space; space = SHA1_BLOCK_SIZE; pos = 0;
bsw_32(ctx->wbuf, SHA1_BLOCK_SIZE >> 2);
sha1_compile(ctx);
}
memcpy(((unsigned char*)ctx->wbuf) + pos, sp, len);
}
/* SHA1 final padding and digest calculation */
void sha1_end(unsigned char hval[], sha1_ctx ctx[1])
{ uint32_t i = (uint32_t)(ctx->count[0] & SHA1_MASK);
/* put bytes in the buffer in an order in which references to */
/* 32-bit words will put bytes with lower addresses into the */
/* top of 32 bit words on BOTH big and little endian machines */
bsw_32(ctx->wbuf, (i + 3) >> 2);
/* we now need to mask valid bytes and add the padding which is */
/* a single 1 bit and as many zero bits as necessary. Note that */
/* we can always add the first padding byte here because the */
/* buffer always has at least one empty slot */
ctx->wbuf[i >> 2] &= 0xffffff80 << 8 * (~i & 3);
ctx->wbuf[i >> 2] |= 0x00000080 << 8 * (~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;
/* the following 32-bit length fields are assembled in the */
/* wrong byte order on little endian machines but this is */
/* corrected later since they are only ever used as 32-bit */
/* word values. */
ctx->wbuf[14] = (ctx->count[1] << 3) | (ctx->count[0] >> 29);
ctx->wbuf[15] = 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 long len)
{ sha1_ctx cx[1];
sha1_begin(cx); sha1_hash(data, len, cx); sha1_end(hval, cx);
}
#if defined(__cplusplus)
}
#endif
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