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0abae163 RL |
1 | /* |
2 | * Copyright 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 <openssl/core_names.h> | |
11 | #include "crypto/dsa.h" | |
12 | ||
13 | /* | |
14 | * The intention with the "backend" source file is to offer backend support | |
15 | * for legacy backends (EVP_PKEY_ASN1_METHOD and EVP_PKEY_METHOD) and provider | |
16 | * implementations alike. | |
17 | */ | |
18 | ||
19 | int dsa_key_fromdata(DSA *dsa, const OSSL_PARAM params[]) | |
20 | { | |
21 | const OSSL_PARAM *param_priv_key, *param_pub_key; | |
22 | BIGNUM *priv_key = NULL, *pub_key = NULL; | |
23 | ||
24 | if (dsa == NULL) | |
25 | return 0; | |
26 | ||
27 | param_priv_key = | |
28 | OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_PRIV_KEY); | |
29 | param_pub_key = | |
30 | OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_PUB_KEY); | |
31 | ||
32 | /* It's ok if neither half is present */ | |
33 | if (param_priv_key == NULL && param_pub_key == NULL) | |
34 | return 1; | |
35 | ||
36 | /* | |
b03ec3b5 | 37 | * DSA documentation says that a public key must be present if a |
0abae163 RL |
38 | * private key is present. |
39 | */ | |
40 | if (param_priv_key != NULL && param_pub_key == NULL) | |
41 | return 0; | |
42 | ||
43 | if (param_pub_key != NULL && !OSSL_PARAM_get_BN(param_pub_key, &pub_key)) | |
44 | goto err; | |
45 | if (param_priv_key != NULL && !OSSL_PARAM_get_BN(param_priv_key, &priv_key)) | |
46 | goto err; | |
47 | ||
48 | if (!DSA_set0_key(dsa, pub_key, priv_key)) | |
49 | goto err; | |
50 | ||
51 | return 1; | |
52 | ||
53 | err: | |
54 | BN_clear_free(priv_key); | |
55 | BN_free(pub_key); | |
56 | return 0; | |
57 | } |