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/* $OpenBSD: helper.c,v 1.18 2019/06/28 13:32:41 deraadt Exp $ */
/*
* Copyright (c) 2000 Poul-Henning Kamp <phk@FreeBSD.org>
*
* 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.
*/
/*
* If we meet some day, and you think this stuff is worth it, you
* can buy me a beer in return. Poul-Henning Kamp
*/
#include <sys/types.h>
#include <sys/cdefs.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <hashinc>
#define MINIMUM(a, b) (((a) < (b)) ? (a) : (b))
char *
HASHEnd(HASH_CTX *ctx, char *buf)
{
int i;
u_int8_t digest[HASH_DIGEST_LENGTH];
static const char hex[] = "0123456789abcdef";
if (buf == NULL && (buf = malloc(HASH_DIGEST_STRING_LENGTH)) == NULL)
return (NULL);
HASHFinal(digest, ctx);
for (i = 0; i < HASH_DIGEST_LENGTH; i++) {
buf[i + i] = hex[digest[i] >> 4];
buf[i + i + 1] = hex[digest[i] & 0x0f];
}
buf[i + i] = '\0';
explicit_bzero(digest, sizeof(digest));
return (buf);
}
DEF_WEAK(HASHEnd);
char *
HASHFileChunk(const char *filename, char *buf, off_t off, off_t len)
{
struct stat sb;
u_char buffer[BUFSIZ];
HASH_CTX ctx;
int fd, save_errno;
ssize_t nr;
HASHInit(&ctx);
if ((fd = open(filename, O_RDONLY)) == -1)
return (NULL);
if (len == 0) {
if (fstat(fd, &sb) == -1) {
save_errno = errno;
close(fd);
errno = save_errno;
return (NULL);
}
len = sb.st_size;
}
if (off > 0 && lseek(fd, off, SEEK_SET) == -1) {
save_errno = errno;
close(fd);
errno = save_errno;
return (NULL);
}
while ((nr = read(fd, buffer, MINIMUM(sizeof(buffer), len))) > 0) {
HASHUpdate(&ctx, buffer, nr);
if (len > 0 && (len -= nr) == 0)
break;
}
save_errno = errno;
close(fd);
errno = save_errno;
return (nr == -1 ? NULL : HASHEnd(&ctx, buf));
}
DEF_WEAK(HASHFileChunk);
char *
HASHFile(const char *filename, char *buf)
{
return (HASHFileChunk(filename, buf, 0, 0));
}
DEF_WEAK(HASHFile);
char *
HASHData(const u_char *data, size_t len, char *buf)
{
HASH_CTX ctx;
HASHInit(&ctx);
HASHUpdate(&ctx, data, len);
return (HASHEnd(&ctx, buf));
}
DEF_WEAK(HASHData);
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