1/*
2 * Copyright 1995-2021 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 <stdio.h>
11#include "internal/cryptlib.h"
12#include "internal/provider.h"
13#include <openssl/rand.h>
14#include <openssl/rsa.h>
15#include <openssl/evp.h>
16#include <openssl/objects.h>
17#include <openssl/x509.h>
18#include <openssl/evp.h>
19
20int EVP_SealInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *type,
21                 unsigned char **ek, int *ekl, unsigned char *iv,
22                 EVP_PKEY **pubk, int npubk)
23{
24    unsigned char key[EVP_MAX_KEY_LENGTH];
25    const OSSL_PROVIDER *prov;
26    OSSL_LIB_CTX *libctx = NULL;
27    EVP_PKEY_CTX *pctx = NULL;
28    const EVP_CIPHER *cipher;
29    int i, len;
30    int rv = 0;
31
32    if (type != NULL) {
33        EVP_CIPHER_CTX_reset(ctx);
34        if (!EVP_EncryptInit_ex(ctx, type, NULL, NULL, NULL))
35            return 0;
36    }
37    if ((cipher = EVP_CIPHER_CTX_get0_cipher(ctx)) != NULL
38            && (prov = EVP_CIPHER_get0_provider(cipher)) != NULL)
39        libctx = ossl_provider_libctx(prov);
40    if ((npubk <= 0) || !pubk)
41        return 1;
42
43    if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0)
44        return 0;
45
46    len = EVP_CIPHER_CTX_get_iv_length(ctx);
47    if (len < 0 || RAND_priv_bytes_ex(libctx, iv, len, 0) <= 0)
48        goto err;
49
50    len = EVP_CIPHER_CTX_get_key_length(ctx);
51    if (len < 0)
52        goto err;
53
54    if (!EVP_EncryptInit_ex(ctx, NULL, NULL, key, iv))
55        goto err;
56
57    for (i = 0; i < npubk; i++) {
58        size_t keylen = len;
59
60        pctx = EVP_PKEY_CTX_new_from_pkey(libctx, pubk[i], NULL);
61        if (pctx == NULL) {
62            ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
63            goto err;
64        }
65
66        if (EVP_PKEY_encrypt_init(pctx) <= 0
67            || EVP_PKEY_encrypt(pctx, ek[i], &keylen, key, keylen) <= 0)
68            goto err;
69        ekl[i] = (int)keylen;
70        EVP_PKEY_CTX_free(pctx);
71    }
72    pctx = NULL;
73    rv = npubk;
74err:
75    EVP_PKEY_CTX_free(pctx);
76    OPENSSL_cleanse(key, sizeof(key));
77    return rv;
78}
79
80int EVP_SealFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
81{
82    int i;
83    i = EVP_EncryptFinal_ex(ctx, out, outl);
84    if (i)
85        i = EVP_EncryptInit_ex(ctx, NULL, NULL, NULL, NULL);
86    return i;
87}
88