1/*
2 * Copyright 1995-2022 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License").  You may not use
5 * this file except in compliance with the License.  You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include "internal/cryptlib.h"
11
12#include <stdio.h>
13#include <openssl/evp.h>
14#include <openssl/objects.h>
15#include <openssl/x509.h>
16#include <openssl/rsa.h>
17
18int EVP_OpenInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *type,
19                 const unsigned char *ek, int ekl, const unsigned char *iv,
20                 EVP_PKEY *priv)
21{
22    unsigned char *key = NULL;
23    size_t keylen = 0;
24    int ret = 0;
25    EVP_PKEY_CTX *pctx = NULL;
26
27    if (type) {
28        EVP_CIPHER_CTX_reset(ctx);
29        if (!EVP_DecryptInit_ex(ctx, type, NULL, NULL, NULL))
30            goto err;
31    }
32
33    if (priv == NULL)
34        return 1;
35
36    if ((pctx = EVP_PKEY_CTX_new(priv, NULL)) == NULL) {
37        ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
38        goto err;
39    }
40
41    if (EVP_PKEY_decrypt_init(pctx) <= 0
42        || EVP_PKEY_decrypt(pctx, NULL, &keylen, ek, ekl) <= 0)
43        goto err;
44
45    if ((key = OPENSSL_malloc(keylen)) == NULL) {
46        ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
47        goto err;
48    }
49
50    if (EVP_PKEY_decrypt(pctx, key, &keylen, ek, ekl) <= 0)
51        goto err;
52
53    if (EVP_CIPHER_CTX_set_key_length(ctx, keylen) <= 0
54        || !EVP_DecryptInit_ex(ctx, NULL, NULL, key, iv))
55        goto err;
56
57    ret = 1;
58 err:
59    EVP_PKEY_CTX_free(pctx);
60    OPENSSL_clear_free(key, keylen);
61    return ret;
62}
63
64int EVP_OpenFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
65{
66    int i;
67
68    i = EVP_DecryptFinal_ex(ctx, out, outl);
69    if (i)
70        i = EVP_DecryptInit_ex(ctx, NULL, NULL, NULL, NULL);
71    return i;
72}
73