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postgresql/contrib/pgcrypto/sha1.c
Tom Lane e3860ffa4d Initial pgindent run with pg_bsd_indent version 2.0. 
The new indent version includes numerous fixes thanks to Piotr Stefaniak.
The main changes visible in this commit are:

* Nicer formatting of function-pointer declarations.
* No longer unexpectedly removes spaces in expressions using casts,
  sizeof, or offsetof.
* No longer wants to add a space in "struct structname *varname", as
  well as some similar cases for const- or volatile-qualified pointers.
* Declarations using PG_USED_FOR_ASSERTS_ONLY are formatted more nicely.
* Fixes bug where comments following declarations were sometimes placed
  with no space separating them from the code.
* Fixes some odd decisions for comments following case labels.
* Fixes some cases where comments following code were indented to less
  than the expected column 33.

On the less good side, it now tends to put more whitespace around typedef
names that are not listed in typedefs.list.  This might encourage us to
put more effort into typedef name collection; it's not really a bug in
indent itself.

There are more changes coming after this round, having to do with comment
indentation and alignment of lines appearing within parentheses.  I wanted
to limit the size of the diffs to something that could be reviewed without
one's eyes completely glazing over, so it seemed better to split up the
changes as much as practical.

Discussion: https://postgr.es/m/E1dAmxK-0006EE-1r@gemulon.postgresql.org
Discussion: https://postgr.es/m/30527.1495162840@sss.pgh.pa.us
2017-06-21 14:39:04 -04:00

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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.
*
* contrib/pgcrypto/sha1.c
*/
/*
* 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 "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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