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
EVP_SealInit(EVP_CIPHER_CTX * ctx,const EVP_CIPHER * type,unsigned char ** ek,int * ekl,unsigned char * iv,EVP_PKEY ** pubk,int npubk)20 int 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;
74 err:
75 EVP_PKEY_CTX_free(pctx);
76 OPENSSL_cleanse(key, sizeof(key));
77 return rv;
78 }
79
EVP_SealFinal(EVP_CIPHER_CTX * ctx,unsigned char * out,int * outl)80 int 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