114 lines
2.7 KiB
C
114 lines
2.7 KiB
C
/* $OpenBSD: helper.c,v 1.18 2019/06/28 13:32:41 deraadt Exp $ */
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/*
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* Copyright (c) 2000 Poul-Henning Kamp <phk@FreeBSD.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* If we meet some day, and you think this stuff is worth it, you
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* can buy me a beer in return. Poul-Henning Kamp
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <hashinc>
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#define MINIMUM(a, b) (((a) < (b)) ? (a) : (b))
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char *
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HASHEnd(HASH_CTX *ctx, char *buf)
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{
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int i;
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uint8_t digest[HASH_DIGEST_LENGTH];
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static const char hex[] = "0123456789abcdef";
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if (buf == NULL && (buf = malloc(HASH_DIGEST_STRING_LENGTH)) == NULL)
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return (NULL);
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HASHFinal(digest, ctx);
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for (i = 0; i < HASH_DIGEST_LENGTH; i++) {
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buf[i + i] = hex[digest[i] >> 4];
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buf[i + i + 1] = hex[digest[i] & 0x0f];
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}
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buf[i + i] = '\0';
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explicit_bzero(digest, sizeof(digest));
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return (buf);
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}
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char *
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HASHFileChunk(const char *filename, char *buf, off_t off, off_t len)
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{
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struct stat sb;
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unsigned char buffer[BUFSIZ];
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HASH_CTX ctx;
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int fd, save_errno;
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ssize_t nr;
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HASHInit(&ctx);
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if ((fd = open(filename, O_RDONLY)) == -1)
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return (NULL);
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if (len == 0) {
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if (fstat(fd, &sb) == -1) {
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save_errno = errno;
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close(fd);
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errno = save_errno;
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return (NULL);
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}
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len = sb.st_size;
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}
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if (off > 0 && lseek(fd, off, SEEK_SET) == -1) {
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save_errno = errno;
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close(fd);
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errno = save_errno;
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return (NULL);
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}
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while ((nr = read(fd, buffer, MINIMUM(sizeof(buffer), (size_t)len))) > 0) {
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HASHUpdate(&ctx, buffer, nr);
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if (len > 0 && (len -= nr) == 0)
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break;
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}
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save_errno = errno;
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close(fd);
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errno = save_errno;
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return (nr == -1 ? NULL : HASHEnd(&ctx, buf));
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}
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char *
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HASHFile(const char *filename, char *buf)
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{
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return (HASHFileChunk(filename, buf, 0, 0));
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}
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char *
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HASHData(const unsigned char *data, size_t len, char *buf)
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{
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HASH_CTX ctx;
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HASHInit(&ctx);
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HASHUpdate(&ctx, data, len);
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return (HASHEnd(&ctx, buf));
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}
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