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