OpenBSD-4.6/bin/md5/crc.c
/* $OpenBSD: crc.c,v 1.2 2004/05/10 19:48:07 deraadt Exp $ */
/*
* Copyright (c) 2004 Todd C. Miller <Todd.Miller@courtesan.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef lint
static const char rcsid[] = "$OpenBSD: crc.c,v 1.2 2004/05/10 19:48:07 deraadt Exp $";
#endif /* not lint */
#include <sys/types.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "crc.h"
/*
* Table-driven version of the following polynomial from POSIX 1003.2:
* G(x) = x^32 + x^26 + x^23 + x^22 + x^16 + x^12 + x^11 + x^10 + x^8 +
* x^7 + x^5 + x^4 + x^2 + x + 1
*/
static const u_int32_t crc32tab[] = {
0x00000000U,
0x04c11db7U, 0x09823b6eU, 0x0d4326d9U, 0x130476dcU, 0x17c56b6bU,
0x1a864db2U, 0x1e475005U, 0x2608edb8U, 0x22c9f00fU, 0x2f8ad6d6U,
0x2b4bcb61U, 0x350c9b64U, 0x31cd86d3U, 0x3c8ea00aU, 0x384fbdbdU,
0x4c11db70U, 0x48d0c6c7U, 0x4593e01eU, 0x4152fda9U, 0x5f15adacU,
0x5bd4b01bU, 0x569796c2U, 0x52568b75U, 0x6a1936c8U, 0x6ed82b7fU,
0x639b0da6U, 0x675a1011U, 0x791d4014U, 0x7ddc5da3U, 0x709f7b7aU,
0x745e66cdU, 0x9823b6e0U, 0x9ce2ab57U, 0x91a18d8eU, 0x95609039U,
0x8b27c03cU, 0x8fe6dd8bU, 0x82a5fb52U, 0x8664e6e5U, 0xbe2b5b58U,
0xbaea46efU, 0xb7a96036U, 0xb3687d81U, 0xad2f2d84U, 0xa9ee3033U,
0xa4ad16eaU, 0xa06c0b5dU, 0xd4326d90U, 0xd0f37027U, 0xddb056feU,
0xd9714b49U, 0xc7361b4cU, 0xc3f706fbU, 0xceb42022U, 0xca753d95U,
0xf23a8028U, 0xf6fb9d9fU, 0xfbb8bb46U, 0xff79a6f1U, 0xe13ef6f4U,
0xe5ffeb43U, 0xe8bccd9aU, 0xec7dd02dU, 0x34867077U, 0x30476dc0U,
0x3d044b19U, 0x39c556aeU, 0x278206abU, 0x23431b1cU, 0x2e003dc5U,
0x2ac12072U, 0x128e9dcfU, 0x164f8078U, 0x1b0ca6a1U, 0x1fcdbb16U,
0x018aeb13U, 0x054bf6a4U, 0x0808d07dU, 0x0cc9cdcaU, 0x7897ab07U,
0x7c56b6b0U, 0x71159069U, 0x75d48ddeU, 0x6b93dddbU, 0x6f52c06cU,
0x6211e6b5U, 0x66d0fb02U, 0x5e9f46bfU, 0x5a5e5b08U, 0x571d7dd1U,
0x53dc6066U, 0x4d9b3063U, 0x495a2dd4U, 0x44190b0dU, 0x40d816baU,
0xaca5c697U, 0xa864db20U, 0xa527fdf9U, 0xa1e6e04eU, 0xbfa1b04bU,
0xbb60adfcU, 0xb6238b25U, 0xb2e29692U, 0x8aad2b2fU, 0x8e6c3698U,
0x832f1041U, 0x87ee0df6U, 0x99a95df3U, 0x9d684044U, 0x902b669dU,
0x94ea7b2aU, 0xe0b41de7U, 0xe4750050U, 0xe9362689U, 0xedf73b3eU,
0xf3b06b3bU, 0xf771768cU, 0xfa325055U, 0xfef34de2U, 0xc6bcf05fU,
0xc27dede8U, 0xcf3ecb31U, 0xcbffd686U, 0xd5b88683U, 0xd1799b34U,
0xdc3abdedU, 0xd8fba05aU, 0x690ce0eeU, 0x6dcdfd59U, 0x608edb80U,
0x644fc637U, 0x7a089632U, 0x7ec98b85U, 0x738aad5cU, 0x774bb0ebU,
0x4f040d56U, 0x4bc510e1U, 0x46863638U, 0x42472b8fU, 0x5c007b8aU,
0x58c1663dU, 0x558240e4U, 0x51435d53U, 0x251d3b9eU, 0x21dc2629U,
0x2c9f00f0U, 0x285e1d47U, 0x36194d42U, 0x32d850f5U, 0x3f9b762cU,
0x3b5a6b9bU, 0x0315d626U, 0x07d4cb91U, 0x0a97ed48U, 0x0e56f0ffU,
0x1011a0faU, 0x14d0bd4dU, 0x19939b94U, 0x1d528623U, 0xf12f560eU,
0xf5ee4bb9U, 0xf8ad6d60U, 0xfc6c70d7U, 0xe22b20d2U, 0xe6ea3d65U,
0xeba91bbcU, 0xef68060bU, 0xd727bbb6U, 0xd3e6a601U, 0xdea580d8U,
0xda649d6fU, 0xc423cd6aU, 0xc0e2d0ddU, 0xcda1f604U, 0xc960ebb3U,
0xbd3e8d7eU, 0xb9ff90c9U, 0xb4bcb610U, 0xb07daba7U, 0xae3afba2U,
0xaafbe615U, 0xa7b8c0ccU, 0xa379dd7bU, 0x9b3660c6U, 0x9ff77d71U,
0x92b45ba8U, 0x9675461fU, 0x8832161aU, 0x8cf30badU, 0x81b02d74U,
0x857130c3U, 0x5d8a9099U, 0x594b8d2eU, 0x5408abf7U, 0x50c9b640U,
0x4e8ee645U, 0x4a4ffbf2U, 0x470cdd2bU, 0x43cdc09cU, 0x7b827d21U,
0x7f436096U, 0x7200464fU, 0x76c15bf8U, 0x68860bfdU, 0x6c47164aU,
0x61043093U, 0x65c52d24U, 0x119b4be9U, 0x155a565eU, 0x18197087U,
0x1cd86d30U, 0x029f3d35U, 0x065e2082U, 0x0b1d065bU, 0x0fdc1becU,
0x3793a651U, 0x3352bbe6U, 0x3e119d3fU, 0x3ad08088U, 0x2497d08dU,
0x2056cd3aU, 0x2d15ebe3U, 0x29d4f654U, 0xc5a92679U, 0xc1683bceU,
0xcc2b1d17U, 0xc8ea00a0U, 0xd6ad50a5U, 0xd26c4d12U, 0xdf2f6bcbU,
0xdbee767cU, 0xe3a1cbc1U, 0xe760d676U, 0xea23f0afU, 0xeee2ed18U,
0xf0a5bd1dU, 0xf464a0aaU, 0xf9278673U, 0xfde69bc4U, 0x89b8fd09U,
0x8d79e0beU, 0x803ac667U, 0x84fbdbd0U, 0x9abc8bd5U, 0x9e7d9662U,
0x933eb0bbU, 0x97ffad0cU, 0xafb010b1U, 0xab710d06U, 0xa6322bdfU,
0xa2f33668U, 0xbcb4666dU, 0xb8757bdaU, 0xb5365d03U, 0xb1f740b4U
};
void
CKSUM_Init(CKSUM_CTX *ctx)
{
ctx->crc = 0;
ctx->len = 0;
}
#define UPDATE(crc, byte) do \
(crc) = ((crc) << 8) ^ crc32tab[((crc) >> 24) ^ (byte)]; \
while(0)
void
CKSUM_Update(CKSUM_CTX *ctx, const unsigned char *buf, size_t len)
{
size_t i;
for (i = 0; i < len; i++)
UPDATE(ctx->crc, buf[i]);
ctx->len += len;
}
void
CKSUM_Final(CKSUM_CTX *ctx)
{
off_t len = ctx->len;
/* add in number of bytes read and finish */
while (len != 0) {
UPDATE(ctx->crc, len & 0xff);
len >>= 8;
}
ctx->crc = ~ctx->crc;
}
char *
CKSUM_End(CKSUM_CTX *ctx, char *outstr)
{
CKSUM_Final(ctx);
if (outstr == NULL) {
if (asprintf(&outstr, "%u %lld", ctx->crc, ctx->len) == -1)
return (NULL);
} else {
(void)snprintf(outstr, (size_t)CKSUM_DIGEST_STRING_LENGTH,
"%u %lld", ctx->crc, ctx->len);
}
return (outstr);
}
void
SUM_Init(SUM_CTX *ctx)
{
ctx->crc = 0;
ctx->len = 0;
}
void
SUM_Update(SUM_CTX *ctx, const unsigned char *buf, size_t len)
{
size_t i;
for (i = 0; i < len; i++) {
ctx->crc = ((ctx->crc >> 1) + ((ctx->crc & 1) << 15) + buf[i]);
ctx->crc &= 0xffff;
}
ctx->len += len;
}
void
SUM_Final(SUM_CTX *ctx)
{
ctx->len = (ctx->len + 1023) / 1024; /* convert to 1KB blocks */
}
char *
SUM_End(SUM_CTX *ctx, char *outstr)
{
SUM_Final(ctx);
if (outstr == NULL) {
if (asprintf(&outstr, "%u %lld", ctx->crc, ctx->len) == -1)
return (NULL);
} else {
(void)snprintf(outstr, (size_t)SUM_DIGEST_STRING_LENGTH,
"%u %lld", ctx->crc, ctx->len);
}
return (outstr);
}
void
SYSVSUM_Init(SYSVSUM_CTX *ctx)
{
ctx->crc = 0;
ctx->len = 0;
}
void
SYSVSUM_Update(SYSVSUM_CTX *ctx, const unsigned char *buf, size_t len)
{
size_t i;
for (i = 0; i < len; i++)
ctx->crc += buf[i];
ctx->len += len;
}
void
SYSVSUM_Final(SYSVSUM_CTX *ctx)
{
ctx->crc = (ctx->crc & 0xffff) + (ctx->crc >> 16);
ctx->crc = (ctx->crc & 0xffff) + (ctx->crc >> 16);
ctx->len = (ctx->len + 511) / 512; /* convert to 512 byte blocks */
}
char *
SYSVSUM_End(SYSVSUM_CTX *ctx, char *outstr)
{
SYSVSUM_Final(ctx);
if (outstr == NULL) {
if (asprintf(&outstr, "%u %lld", ctx->crc, ctx->len) == -1)
return (NULL);
} else {
(void)snprintf(outstr, (size_t)SYSVSUM_DIGEST_STRING_LENGTH,
"%u %lld", ctx->crc, ctx->len);
}
return (outstr);
}