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// Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <contrib/restricted/google/boringssl/include/openssl/cipher.h>
#include <assert.h>
#include <contrib/restricted/google/boringssl/include/openssl/digest.h>
#include <contrib/restricted/google/boringssl/include/openssl/mem.h>
int EVP_BytesToKey(const EVP_CIPHER *type, const EVP_MD *md,
const uint8_t salt[8], const uint8_t *data, size_t data_len,
unsigned count, uint8_t *key, uint8_t *iv) {
uint8_t md_buf[EVP_MAX_MD_SIZE];
unsigned addmd = 0;
unsigned mds = 0, i;
int rv = 0;
unsigned nkey = EVP_CIPHER_key_length(type);
unsigned niv = EVP_CIPHER_iv_length(type);
assert(nkey <= EVP_MAX_KEY_LENGTH);
assert(niv <= EVP_MAX_IV_LENGTH);
if (data == nullptr) {
return nkey;
}
bssl::ScopedEVP_MD_CTX c;
for (;;) {
if (!EVP_DigestInit_ex(c.get(), md, nullptr)) {
goto err;
}
if (addmd++) {
if (!EVP_DigestUpdate(c.get(), md_buf, mds)) {
goto err;
}
}
if (!EVP_DigestUpdate(c.get(), data, data_len)) {
goto err;
}
if (salt != nullptr) {
if (!EVP_DigestUpdate(c.get(), salt, 8)) {
goto err;
}
}
if (!EVP_DigestFinal_ex(c.get(), md_buf, &mds)) {
goto err;
}
for (i = 1; i < count; i++) {
if (!EVP_DigestInit_ex(c.get(), md, nullptr) ||
!EVP_DigestUpdate(c.get(), md_buf, mds) ||
!EVP_DigestFinal_ex(c.get(), md_buf, &mds)) {
goto err;
}
}
i = 0;
if (nkey) {
for (;;) {
if (nkey == 0 || i == mds) {
break;
}
if (key != nullptr) {
*(key++) = md_buf[i];
}
nkey--;
i++;
}
}
if (niv && i != mds) {
for (;;) {
if (niv == 0 || i == mds) {
break;
}
if (iv != nullptr) {
*(iv++) = md_buf[i];
}
niv--;
i++;
}
}
if (nkey == 0 && niv == 0) {
break;
}
}
rv = EVP_CIPHER_key_length(type);
err:
OPENSSL_cleanse(md_buf, EVP_MAX_MD_SIZE);
return rv;
}
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