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/*
zip_crypto_mbedtls.c -- mbed TLS 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 <mbedtls/ctr_drbg.h>
#include <mbedtls/entropy.h>
#include <mbedtls/pkcs5.h>
#include <limits.h>
_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;
if ((aes = (_zip_crypto_aes_t *)malloc(sizeof(*aes))) == NULL) {
zip_error_set(error, ZIP_ER_MEMORY, 0);
return NULL;
}
mbedtls_aes_init(aes);
mbedtls_aes_setkey_enc(aes, (const unsigned char *)key, (unsigned int)key_size);
return aes;
}
void
_zip_crypto_aes_free(_zip_crypto_aes_t *aes) {
if (aes == NULL) {
return;
}
mbedtls_aes_free(aes);
free(aes);
}
_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;
}
if ((hmac = (_zip_crypto_hmac_t *)malloc(sizeof(*hmac))) == NULL) {
zip_error_set(error, ZIP_ER_MEMORY, 0);
return NULL;
}
mbedtls_md_init(hmac);
if (mbedtls_md_setup(hmac, mbedtls_md_info_from_type(MBEDTLS_MD_SHA1), 1) != 0) {
zip_error_set(error, ZIP_ER_INTERNAL, 0);
free(hmac);
return NULL;
}
if (mbedtls_md_hmac_starts(hmac, (const unsigned char *)secret, (size_t)secret_length) != 0) {
zip_error_set(error, ZIP_ER_INTERNAL, 0);
free(hmac);
return NULL;
}
return hmac;
}
void
_zip_crypto_hmac_free(_zip_crypto_hmac_t *hmac) {
if (hmac == NULL) {
return;
}
mbedtls_md_free(hmac);
free(hmac);
}
bool
_zip_crypto_pbkdf2(const zip_uint8_t *key, zip_uint64_t key_length, const zip_uint8_t *salt, zip_uint16_t salt_length, int iterations, zip_uint8_t *output, zip_uint64_t output_length) {
mbedtls_md_context_t sha1_ctx;
bool ok = true;
mbedtls_md_init(&sha1_ctx);
if (mbedtls_md_setup(&sha1_ctx, mbedtls_md_info_from_type(MBEDTLS_MD_SHA1), 1) != 0) {
ok = false;
}
if (ok && mbedtls_pkcs5_pbkdf2_hmac(&sha1_ctx, (const unsigned char *)key, (size_t)key_length, (const unsigned char *)salt, (size_t)salt_length, (unsigned int)iterations, (uint32_t)output_length, (unsigned char *)output) != 0) {
ok = false;
}
mbedtls_md_free(&sha1_ctx);
return ok;
}
typedef struct {
mbedtls_entropy_context entropy;
mbedtls_ctr_drbg_context ctr_drbg;
} zip_random_context_t;
ZIP_EXTERN bool
zip_secure_random(zip_uint8_t *buffer, zip_uint16_t length) {
static zip_random_context_t *ctx = NULL;
const unsigned char *pers = "zip_crypto_mbedtls";
if (!ctx) {
ctx = (zip_random_context_t *)malloc(sizeof(zip_random_context_t));
if (!ctx) {
return false;
}
mbedtls_entropy_init(&ctx->entropy);
mbedtls_ctr_drbg_init(&ctx->ctr_drbg);
if (mbedtls_ctr_drbg_seed(&ctx->ctr_drbg, mbedtls_entropy_func, &ctx->entropy, pers, strlen(pers)) != 0) {
mbedtls_ctr_drbg_free(&ctx->ctr_drbg);
mbedtls_entropy_free(&ctx->entropy);
free(ctx);
ctx = NULL;
return false;
}
}
return mbedtls_ctr_drbg_random(&ctx->ctr_drbg, (unsigned char *)buffer, (size_t)length) == 0;
}
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