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/*
zip_crypto_openssl.c -- OpenSSL wrapper.
Copyright (C) 2018-2021 Dieter Baron and Thomas Klausner
This file is part of libzip, a library to manipulate ZIP archives.
The authors can be contacted at <info@libzip.org>
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
3. The names of the authors may not be used to endorse or promote
products derived from this software without specific prior
written permission.
THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdlib.h>
#include "zipint.h"
#include "zip_crypto.h"
#include <limits.h>
#include <openssl/rand.h>
#if OPENSSL_VERSION_NUMBER < 0x1010000fL || (defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER < 0x02070000fL)
#define USE_OPENSSL_1_0_API
#endif
_zip_crypto_aes_t *
_zip_crypto_aes_new(const zip_uint8_t *key, zip_uint16_t key_size, zip_error_t *error) {
_zip_crypto_aes_t *aes;
const EVP_CIPHER* cipher_type;
switch (key_size) {
case 128:
cipher_type = EVP_aes_128_ecb();
break;
case 192:
cipher_type = EVP_aes_192_ecb();
break;
case 256:
cipher_type = EVP_aes_256_ecb();
break;
default:
zip_error_set(error, ZIP_ER_INTERNAL, 0);
return NULL;
}
#ifdef USE_OPENSSL_1_0_API
if ((aes = (_zip_crypto_aes_t *)malloc(sizeof(*aes))) == NULL) {
zip_error_set(error, ZIP_ER_MEMORY, 0);
return NULL;
}
memset(aes, 0, sizeof(*aes));
#else
if ((aes = EVP_CIPHER_CTX_new()) == NULL) {
zip_error_set(error, ZIP_ER_MEMORY, 0);
return NULL;
}
#endif
if (EVP_EncryptInit_ex(aes, cipher_type, NULL, key, NULL) != 1) {
#ifdef USE_OPENSSL_1_0_API
free(aes);
#else
EVP_CIPHER_CTX_free(aes);
#endif
zip_error_set(error, ZIP_ER_INTERNAL, 0);
return NULL;
}
return aes;
}
void
_zip_crypto_aes_free(_zip_crypto_aes_t *aes) {
if (aes == NULL) {
return;
}
#ifdef USE_OPENSSL_1_0_API
EVP_CIPHER_CTX_cleanup(aes);
_zip_crypto_clear(aes, sizeof(*aes));
free(aes);
#else
EVP_CIPHER_CTX_free(aes);
#endif
}
bool
_zip_crypto_aes_encrypt_block(_zip_crypto_aes_t *aes, const zip_uint8_t *in, zip_uint8_t *out) {
int len;
if (EVP_EncryptUpdate(aes, out, &len, in, ZIP_CRYPTO_AES_BLOCK_LENGTH) != 1) {
return false;
}
return true;
}
_zip_crypto_hmac_t *
_zip_crypto_hmac_new(const zip_uint8_t *secret, zip_uint64_t secret_length, zip_error_t *error) {
_zip_crypto_hmac_t *hmac;
if (secret_length > INT_MAX) {
zip_error_set(error, ZIP_ER_INVAL, 0);
return NULL;
}
#ifdef USE_OPENSSL_1_0_API
if ((hmac = (_zip_crypto_hmac_t *)malloc(sizeof(*hmac))) == NULL) {
zip_error_set(error, ZIP_ER_MEMORY, 0);
return NULL;
}
HMAC_CTX_init(hmac);
#else
if ((hmac = HMAC_CTX_new()) == NULL) {
zip_error_set(error, ZIP_ER_MEMORY, 0);
return NULL;
}
#endif
if (HMAC_Init_ex(hmac, secret, (int)secret_length, EVP_sha1(), NULL) != 1) {
zip_error_set(error, ZIP_ER_INTERNAL, 0);
#ifdef USE_OPENSSL_1_0_API
free(hmac);
#else
HMAC_CTX_free(hmac);
#endif
return NULL;
}
return hmac;
}
void
_zip_crypto_hmac_free(_zip_crypto_hmac_t *hmac) {
if (hmac == NULL) {
return;
}
#ifdef USE_OPENSSL_1_0_API
HMAC_CTX_cleanup(hmac);
_zip_crypto_clear(hmac, sizeof(*hmac));
free(hmac);
#else
HMAC_CTX_free(hmac);
#endif
}
bool
_zip_crypto_hmac_output(_zip_crypto_hmac_t *hmac, zip_uint8_t *data) {
unsigned int length;
return HMAC_Final(hmac, data, &length) == 1;
}
ZIP_EXTERN bool
zip_secure_random(zip_uint8_t *buffer, zip_uint16_t length) {
return RAND_bytes(buffer, length) == 1;
}
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