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postgresql/contrib/pgcrypto/sha1.c
Magnus Hagander 4c10623306 Update a number of broken links in comments. 
Josh Kupershmidt
2010-04-02 15:21:20 +00:00

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/* $KAME: sha1.c,v 1.3 2000/02/22 14:01:18 itojun Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $PostgreSQL: pgsql/contrib/pgcrypto/sha1.c,v 1.18 2010/04/02 15:21:20 mha Exp $
*/
/*
* FIPS pub 180-1: Secure Hash Algorithm (SHA-1)
* based on: http://www.itl.nist.gov/fipspubs/fip180-1.htm
* implemented by Jun-ichiro itojun Itoh <itojun@itojun.org>
*/
#include "postgres.h"
#include <sys/param.h>
#include "px.h"
#include "sha1.h"
/* constant table */
static uint32 _K[] = {0x5a827999, 0x6ed9eba1, 0x8f1bbcdc, 0xca62c1d6};
#define K(t) _K[(t) / 20]
#define F0(b, c, d) (((b) & (c)) | ((~(b)) & (d)))
#define F1(b, c, d) (((b) ^ (c)) ^ (d))
#define F2(b, c, d) (((b) & (c)) | ((b) & (d)) | ((c) & (d)))
#define F3(b, c, d) (((b) ^ (c)) ^ (d))
#define S(n, x) (((x) << (n)) | ((x) >> (32 - (n))))
#define H(n) (ctxt->h.b32[(n)])
#define COUNT (ctxt->count)
#define BCOUNT (ctxt->c.b64[0] / 8)
#define W(n) (ctxt->m.b32[(n)])
#define PUTBYTE(x) \
do { \
ctxt->m.b8[(COUNT % 64)] = (x); \
COUNT++; \
COUNT %= 64; \
ctxt->c.b64[0] += 8; \
if (COUNT % 64 == 0) \
sha1_step(ctxt); \
} while (0)
#define PUTPAD(x) \
do { \
ctxt->m.b8[(COUNT % 64)] = (x); \
COUNT++; \
COUNT %= 64; \
if (COUNT % 64 == 0) \
sha1_step(ctxt); \
} while (0)
static void sha1_step(struct sha1_ctxt *);
static void
sha1_step(struct sha1_ctxt * ctxt)
{
uint32 a,
b,
c,
d,
e;
size_t t,
s;
uint32 tmp;
#ifndef WORDS_BIGENDIAN
struct sha1_ctxt tctxt;
memmove(&tctxt.m.b8[0], &ctxt->m.b8[0], 64);
ctxt->m.b8[0] = tctxt.m.b8[3];
ctxt->m.b8[1] = tctxt.m.b8[2];
ctxt->m.b8[2] = tctxt.m.b8[1];
ctxt->m.b8[3] = tctxt.m.b8[0];
ctxt->m.b8[4] = tctxt.m.b8[7];
ctxt->m.b8[5] = tctxt.m.b8[6];
ctxt->m.b8[6] = tctxt.m.b8[5];
ctxt->m.b8[7] = tctxt.m.b8[4];
ctxt->m.b8[8] = tctxt.m.b8[11];
ctxt->m.b8[9] = tctxt.m.b8[10];
ctxt->m.b8[10] = tctxt.m.b8[9];
ctxt->m.b8[11] = tctxt.m.b8[8];
ctxt->m.b8[12] = tctxt.m.b8[15];
ctxt->m.b8[13] = tctxt.m.b8[14];
ctxt->m.b8[14] = tctxt.m.b8[13];
ctxt->m.b8[15] = tctxt.m.b8[12];
ctxt->m.b8[16] = tctxt.m.b8[19];
ctxt->m.b8[17] = tctxt.m.b8[18];
ctxt->m.b8[18] = tctxt.m.b8[17];
ctxt->m.b8[19] = tctxt.m.b8[16];
ctxt->m.b8[20] = tctxt.m.b8[23];
ctxt->m.b8[21] = tctxt.m.b8[22];
ctxt->m.b8[22] = tctxt.m.b8[21];
ctxt->m.b8[23] = tctxt.m.b8[20];
ctxt->m.b8[24] = tctxt.m.b8[27];
ctxt->m.b8[25] = tctxt.m.b8[26];
ctxt->m.b8[26] = tctxt.m.b8[25];
ctxt->m.b8[27] = tctxt.m.b8[24];
ctxt->m.b8[28] = tctxt.m.b8[31];
ctxt->m.b8[29] = tctxt.m.b8[30];
ctxt->m.b8[30] = tctxt.m.b8[29];
ctxt->m.b8[31] = tctxt.m.b8[28];
ctxt->m.b8[32] = tctxt.m.b8[35];
ctxt->m.b8[33] = tctxt.m.b8[34];
ctxt->m.b8[34] = tctxt.m.b8[33];
ctxt->m.b8[35] = tctxt.m.b8[32];
ctxt->m.b8[36] = tctxt.m.b8[39];
ctxt->m.b8[37] = tctxt.m.b8[38];
ctxt->m.b8[38] = tctxt.m.b8[37];
ctxt->m.b8[39] = tctxt.m.b8[36];
ctxt->m.b8[40] = tctxt.m.b8[43];
ctxt->m.b8[41] = tctxt.m.b8[42];
ctxt->m.b8[42] = tctxt.m.b8[41];
ctxt->m.b8[43] = tctxt.m.b8[40];
ctxt->m.b8[44] = tctxt.m.b8[47];
ctxt->m.b8[45] = tctxt.m.b8[46];
ctxt->m.b8[46] = tctxt.m.b8[45];
ctxt->m.b8[47] = tctxt.m.b8[44];
ctxt->m.b8[48] = tctxt.m.b8[51];
ctxt->m.b8[49] = tctxt.m.b8[50];
ctxt->m.b8[50] = tctxt.m.b8[49];
ctxt->m.b8[51] = tctxt.m.b8[48];
ctxt->m.b8[52] = tctxt.m.b8[55];
ctxt->m.b8[53] = tctxt.m.b8[54];
ctxt->m.b8[54] = tctxt.m.b8[53];
ctxt->m.b8[55] = tctxt.m.b8[52];
ctxt->m.b8[56] = tctxt.m.b8[59];
ctxt->m.b8[57] = tctxt.m.b8[58];
ctxt->m.b8[58] = tctxt.m.b8[57];
ctxt->m.b8[59] = tctxt.m.b8[56];
ctxt->m.b8[60] = tctxt.m.b8[63];
ctxt->m.b8[61] = tctxt.m.b8[62];
ctxt->m.b8[62] = tctxt.m.b8[61];
ctxt->m.b8[63] = tctxt.m.b8[60];
#endif
a = H(0);
b = H(1);
c = H(2);
d = H(3);
e = H(4);
for (t = 0; t < 20; t++)
{
s = t & 0x0f;
if (t >= 16)
W(s) = S(1, W((s + 13) & 0x0f) ^ W((s + 8) & 0x0f) ^ W((s + 2) & 0x0f) ^ W(s));
tmp = S(5, a) + F0(b, c, d) + e + W(s) + K(t);
e = d;
d = c;
c = S(30, b);
b = a;
a = tmp;
}
for (t = 20; t < 40; t++)
{
s = t & 0x0f;
W(s) = S(1, W((s + 13) & 0x0f) ^ W((s + 8) & 0x0f) ^ W((s + 2) & 0x0f) ^ W(s));
tmp = S(5, a) + F1(b, c, d) + e + W(s) + K(t);
e = d;
d = c;
c = S(30, b);
b = a;
a = tmp;
}
for (t = 40; t < 60; t++)
{
s = t & 0x0f;
W(s) = S(1, W((s + 13) & 0x0f) ^ W((s + 8) & 0x0f) ^ W((s + 2) & 0x0f) ^ W(s));
tmp = S(5, a) + F2(b, c, d) + e + W(s) + K(t);
e = d;
d = c;
c = S(30, b);
b = a;
a = tmp;
}
for (t = 60; t < 80; t++)
{
s = t & 0x0f;
W(s) = S(1, W((s + 13) & 0x0f) ^ W((s + 8) & 0x0f) ^ W((s + 2) & 0x0f) ^ W(s));
tmp = S(5, a) + F3(b, c, d) + e + W(s) + K(t);
e = d;
d = c;
c = S(30, b);
b = a;
a = tmp;
}
H(0) = H(0) + a;
H(1) = H(1) + b;
H(2) = H(2) + c;
H(3) = H(3) + d;
H(4) = H(4) + e;
memset(&ctxt->m.b8[0], 0, 64);
}
/*------------------------------------------------------------*/
void
sha1_init(struct sha1_ctxt * ctxt)
{
memset(ctxt, 0, sizeof(struct sha1_ctxt));
H(0) = 0x67452301;
H(1) = 0xefcdab89;
H(2) = 0x98badcfe;
H(3) = 0x10325476;
H(4) = 0xc3d2e1f0;
}
void
sha1_pad(struct sha1_ctxt * ctxt)
{
size_t padlen; /* pad length in bytes */
size_t padstart;
PUTPAD(0x80);
padstart = COUNT % 64;
padlen = 64 - padstart;
if (padlen < 8)
{
memset(&ctxt->m.b8[padstart], 0, padlen);
COUNT += padlen;
COUNT %= 64;
sha1_step(ctxt);
padstart = COUNT % 64; /* should be 0 */
padlen = 64 - padstart; /* should be 64 */
}
memset(&ctxt->m.b8[padstart], 0, padlen - 8);
COUNT += (padlen - 8);
COUNT %= 64;
#ifdef WORDS_BIGENDIAN
PUTPAD(ctxt->c.b8[0]);
PUTPAD(ctxt->c.b8[1]);
PUTPAD(ctxt->c.b8[2]);
PUTPAD(ctxt->c.b8[3]);
PUTPAD(ctxt->c.b8[4]);
PUTPAD(ctxt->c.b8[5]);
PUTPAD(ctxt->c.b8[6]);
PUTPAD(ctxt->c.b8[7]);
#else
PUTPAD(ctxt->c.b8[7]);
PUTPAD(ctxt->c.b8[6]);
PUTPAD(ctxt->c.b8[5]);
PUTPAD(ctxt->c.b8[4]);
PUTPAD(ctxt->c.b8[3]);
PUTPAD(ctxt->c.b8[2]);
PUTPAD(ctxt->c.b8[1]);
PUTPAD(ctxt->c.b8[0]);
#endif
}
void
sha1_loop(struct sha1_ctxt * ctxt, const uint8 *input0, size_t len)
{
const uint8 *input;
size_t gaplen;
size_t gapstart;
size_t off;
size_t copysiz;
input = (const uint8 *) input0;
off = 0;
while (off < len)
{
gapstart = COUNT % 64;
gaplen = 64 - gapstart;
copysiz = (gaplen < len - off) ? gaplen : len - off;
memmove(&ctxt->m.b8[gapstart], &input[off], copysiz);
COUNT += copysiz;
COUNT %= 64;
ctxt->c.b64[0] += copysiz * 8;
if (COUNT % 64 == 0)
sha1_step(ctxt);
off += copysiz;
}
}
void
sha1_result(struct sha1_ctxt * ctxt, uint8 *digest0)
{
uint8 *digest;
digest = (uint8 *) digest0;
sha1_pad(ctxt);
#ifdef WORDS_BIGENDIAN
memmove(digest, &ctxt->h.b8[0], 20);
#else
digest[0] = ctxt->h.b8[3];
digest[1] = ctxt->h.b8[2];
digest[2] = ctxt->h.b8[1];
digest[3] = ctxt->h.b8[0];
digest[4] = ctxt->h.b8[7];
digest[5] = ctxt->h.b8[6];
digest[6] = ctxt->h.b8[5];
digest[7] = ctxt->h.b8[4];
digest[8] = ctxt->h.b8[11];
digest[9] = ctxt->h.b8[10];
digest[10] = ctxt->h.b8[9];
digest[11] = ctxt->h.b8[8];
digest[12] = ctxt->h.b8[15];
digest[13] = ctxt->h.b8[14];
digest[14] = ctxt->h.b8[13];
digest[15] = ctxt->h.b8[12];
digest[16] = ctxt->h.b8[19];
digest[17] = ctxt->h.b8[18];
digest[18] = ctxt->h.b8[17];
digest[19] = ctxt->h.b8[16];
#endif
}
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