1 /*
2 * Copyright 1995-2020 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
EVP_OpenInit(EVP_CIPHER_CTX * ctx,const EVP_CIPHER * type,const unsigned char * ek,int ekl,const unsigned char * iv,EVP_PKEY * priv)18 int 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_EVP_LIB);
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 goto err;
47
48 if (EVP_PKEY_decrypt(pctx, key, &keylen, ek, ekl) <= 0)
49 goto err;
50
51 if (EVP_CIPHER_CTX_set_key_length(ctx, keylen) <= 0
52 || !EVP_DecryptInit_ex(ctx, NULL, NULL, key, iv))
53 goto err;
54
55 ret = 1;
56 err:
57 EVP_PKEY_CTX_free(pctx);
58 OPENSSL_clear_free(key, keylen);
59 return ret;
60 }
61
EVP_OpenFinal(EVP_CIPHER_CTX * ctx,unsigned char * out,int * outl)62 int EVP_OpenFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
63 {
64 int i;
65
66 i = EVP_DecryptFinal_ex(ctx, out, outl);
67 if (i)
68 i = EVP_DecryptInit_ex(ctx, NULL, NULL, NULL, NULL);
69 return i;
70 }
71
