/*
* Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include <assert.h>
#include "internal/cryptlib.h"
#include <openssl/evp.h>
#include <openssl/err.h>
#include <openssl/rand.h>
#include <openssl/rand_drbg.h>
#include <openssl/engine.h>
#include <openssl/params.h>
#include <openssl/core_names.h>
#include "internal/evp_int.h"
#include "internal/provider.h"
#include "evp_locl.h"
int EVP_CIPHER_CTX_reset(EVP_CIPHER_CTX *ctx)
{
if (ctx == NULL)
return 1;
if (ctx->cipher == NULL || ctx->cipher->prov == NULL)
goto legacy;
if (ctx->provctx != NULL) {
if (ctx->cipher->freectx != NULL)
ctx->cipher->freectx(ctx->provctx);
ctx->provctx = NULL;
}
if (ctx->fetched_cipher != NULL)
EVP_CIPHER_meth_free(ctx->fetched_cipher);
memset(ctx, 0, sizeof(*ctx));
return 1;
/* TODO(3.0): Remove legacy code below */
legacy:
if (ctx->cipher != NULL) {
if (ctx->cipher->cleanup && !ctx->cipher->cleanup(ctx))
return 0;
/* Cleanse cipher context data */
if (ctx->cipher_data && ctx->cipher->ctx_size)
OPENSSL_cleanse(ctx->cipher_data, ctx->cipher->ctx_size);
}
OPENSSL_free(ctx->cipher_data);
#ifndef OPENSSL_NO_ENGINE
ENGINE_finish(ctx->engine);
#endif
memset(ctx, 0, sizeof(*ctx));
return 1;
}
EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void)
{
return OPENSSL_zalloc(sizeof(EVP_CIPHER_CTX));
}
void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx)
{
EVP_CIPHER_CTX_reset(ctx);
OPENSSL_free(ctx);
}
int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
const unsigned char *key, const unsigned char *iv, int enc)
{
if (cipher != NULL)
EVP_CIPHER_CTX_reset(ctx);
return EVP_CipherInit_ex(ctx, cipher, NULL, key, iv, enc);
}
int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
ENGINE *impl, const unsigned char *key,
const unsigned char *iv, int enc)
{
EVP_CIPHER *provciph = NULL;
ENGINE *tmpimpl = NULL;
const EVP_CIPHER *tmpcipher;
/*
* enc == 1 means we are encrypting.
* enc == 0 means we are decrypting.
* enc == -1 means, use the previously initialised value for encrypt/decrypt
*/
if (enc == -1) {
enc = ctx->encrypt;
} else {
if (enc)
enc = 1;
ctx->encrypt = enc;
}
if (cipher == NULL && ctx->cipher == NULL) {
EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET);
return 0;
}
/* TODO(3.0): Legacy work around code