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/* $OpenBSD: helper.c,v 1.16 2016/09/21 04:38:57 guenther 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 <sha2.h> |
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#define MINIMUM(a, b) (((a) < (b)) ? (a) : (b)) |
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char * |
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SHA512_256End(SHA2_CTX *ctx, char *buf) |
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{ |
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int i; |
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u_int8_t digest[SHA512_256_DIGEST_LENGTH]; |
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static const char hex[] = "0123456789abcdef"; |
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if (buf == NULL && (buf = malloc(SHA512_256_DIGEST_STRING_LENGTH)) == NULL) |
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return (NULL); |
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SHA512_256Final(digest, ctx); |
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for (i = 0; i < SHA512_256_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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DEF_WEAK(SHA512_256End); |
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char * |
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SHA512_256FileChunk(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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u_char buffer[BUFSIZ]; |
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SHA2_CTX ctx; |
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int fd, save_errno; |
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ssize_t nr; |
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SHA512_256Init(&ctx); |
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if ((fd = open(filename, O_RDONLY)) < 0) |
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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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close(fd); |
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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) < 0) { |
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close(fd); |
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return (NULL); |
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} |
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while ((nr = read(fd, buffer, MINIMUM(sizeof(buffer), len))) > 0) { |
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SHA512_256Update(&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 < 0 ? NULL : SHA512_256End(&ctx, buf)); |
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} |
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DEF_WEAK(SHA512_256FileChunk); |
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char * |
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SHA512_256File(const char *filename, char *buf) |
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{ |
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return (SHA512_256FileChunk(filename, buf, 0, 0)); |
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} |
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DEF_WEAK(SHA512_256File); |
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char * |
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SHA512_256Data(const u_char *data, size_t len, char *buf) |
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{ |
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SHA2_CTX ctx; |
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SHA512_256Init(&ctx); |
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SHA512_256Update(&ctx, data, len); |
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return (SHA512_256End(&ctx, buf)); |
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} |
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DEF_WEAK(SHA512_256Data); |