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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2017-2018 Todd C. Miller <Todd.Miller@sudo.ws>
*
* 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.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#include <config.h>
#ifdef HAVE_STDBOOL_H
# include <stdbool.h>
#else
# include "compat/stdbool.h"
#endif
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <gcrypt.h>
#include "sudo_compat.h"
#include "sudo_debug.h"
#include "sudo_digest.h"
#define SUDO_LIBGCRYPT_VERSION_MIN "1.3.0"
struct sudo_digest {
int gcry_digest_type;
unsigned int digest_len;
gcry_md_hd_t ctx;
};
/* Map sudo digest type to gcrypt digest type. */
static int
sudo_digest_type_to_gcry(int digest_type)
{
switch (digest_type) {
case SUDO_DIGEST_SHA224:
return GCRY_MD_SHA224;
case SUDO_DIGEST_SHA256:
return GCRY_MD_SHA256;
case SUDO_DIGEST_SHA384:
return GCRY_MD_SHA384;
case SUDO_DIGEST_SHA512:
return GCRY_MD_SHA512;
default:
return -1;
}
}
struct sudo_digest *
sudo_digest_alloc_v1(int digest_type)
{
debug_decl(sudo_digest_alloc, SUDO_DEBUG_UTIL);
static bool initialized = false;
struct sudo_digest *dig;
int gcry_digest_type;
if (!initialized) {
if (!gcry_check_version(SUDO_LIBGCRYPT_VERSION_MIN)) {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
"libgcrypt too old (need %s, have %s)",
SUDO_LIBGCRYPT_VERSION_MIN, gcry_check_version(NULL));
debug_return_ptr(NULL);
}
gcry_control(GCRYCTL_INITIALIZATION_FINISHED, 0);
initialized = true;
}
gcry_digest_type = sudo_digest_type_to_gcry(digest_type);
if (gcry_digest_type == -1) {
errno = EINVAL;
debug_return_ptr(NULL);
}
if ((dig = malloc(sizeof(*dig))) == NULL)
debug_return_ptr(NULL);
dig->gcry_digest_type = gcry_digest_type;
dig->digest_len = gcry_md_get_algo_dlen(gcry_digest_type);
if (gcry_md_open(&dig->ctx, gcry_digest_type, 0) != 0) {
free(dig);
debug_return_ptr(NULL);
}
debug_return_ptr(dig);
}
void
sudo_digest_free_v1(struct sudo_digest *dig)
{
debug_decl(sudo_digest_free, SUDO_DEBUG_UTIL);
if (dig != NULL) {
gcry_md_close(dig->ctx);
free(dig);
}
debug_return;
}
void
sudo_digest_reset_v1(struct sudo_digest *dig)
{
debug_decl(sudo_digest_reset, SUDO_DEBUG_UTIL);
gcry_md_reset(dig->ctx);
debug_return;
}
int
sudo_digest_getlen_v1(int digest_type)
{
debug_decl(sudo_digest_getlen, SUDO_DEBUG_UTIL);
int gcry_digest_type;
gcry_digest_type = sudo_digest_type_to_gcry(digest_type);
if (gcry_digest_type == -1)
debug_return_int(-1);
debug_return_int(gcry_md_get_algo_dlen(gcry_digest_type));
}
void
sudo_digest_update_v1(struct sudo_digest *dig, const void *data, size_t len)
{
debug_decl(sudo_digest_update, SUDO_DEBUG_UTIL);
gcry_md_write(dig->ctx, data, len);
debug_return;
}
void
sudo_digest_final_v1(struct sudo_digest *dig, unsigned char *md)
{
debug_decl(sudo_digest_final, SUDO_DEBUG_UTIL);
gcry_md_final(dig->ctx);
memcpy(md, gcry_md_read(dig->ctx, 0), dig->digest_len);
debug_return;
}
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