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1 | /* | |
2 | * Copyright 1995-2018 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 <openssl/rand.h> | |
13 | #include <openssl/rsa.h> | |
14 | #include <openssl/evp.h> | |
15 | #include <openssl/objects.h> | |
16 | #include <openssl/x509.h> | |
17 | ||
18 | int EVP_SealInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *type, | |
19 | unsigned char **ek, int *ekl, unsigned char *iv, | |
20 | EVP_PKEY **pubk, int npubk) | |
21 | { | |
22 | unsigned char key[EVP_MAX_KEY_LENGTH]; | |
23 | int i; | |
24 | int rv = 0; | |
25 | ||
26 | if (type) { | |
27 | EVP_CIPHER_CTX_reset(ctx); | |
28 | if (!EVP_EncryptInit_ex(ctx, type, NULL, NULL, NULL)) | |
29 | return 0; | |
30 | } | |
31 | if ((npubk <= 0) || !pubk) | |
32 | return 1; | |
33 | if (EVP_CIPHER_CTX_rand_key(ctx, key) <= 0) | |
34 | return 0; | |
35 | ||
36 | if (EVP_CIPHER_CTX_iv_length(ctx) | |
37 | && RAND_bytes(iv, EVP_CIPHER_CTX_iv_length(ctx)) <= 0) | |
38 | goto err; | |
39 | ||
40 | if (!EVP_EncryptInit_ex(ctx, NULL, NULL, key, iv)) | |
41 | goto err; | |
42 | ||
43 | for (i = 0; i < npubk; i++) { | |
44 | ekl[i] = | |
45 | EVP_PKEY_encrypt_old(ek[i], key, EVP_CIPHER_CTX_key_length(ctx), | |
46 | pubk[i]); | |
47 | if (ekl[i] <= 0) { | |
48 | rv = -1; | |
49 | goto err; | |
50 | } | |
51 | } | |
52 | rv = npubk; | |
53 | err: | |
54 | OPENSSL_cleanse(key, sizeof(key)); | |
55 | return rv; | |
56 | } | |
57 | ||
58 | int EVP_SealFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) | |
59 | { | |
60 | int i; | |
61 | i = EVP_EncryptFinal_ex(ctx, out, outl); | |
62 | if (i) | |
63 | i = EVP_EncryptInit_ex(ctx, NULL, NULL, NULL, NULL); | |
64 | return i; | |
65 | } |