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1 | /* |
2 | * Copyright 2019 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_numbers.h> | |
11 | #include <openssl/core_names.h> | |
12 | #include <openssl/bn.h> | |
13 | #include <openssl/dsa.h> | |
14 | #include <openssl/params.h> | |
15 | #include "internal/provider_algs.h" | |
16 | ||
17 | static OSSL_OP_keymgmt_importkey_fn dsa_importkey; | |
18 | ||
19 | static int params_to_key(DSA *dsa, const OSSL_PARAM params[]) | |
20 | { | |
21 | const OSSL_PARAM *param_p, *param_q, *param_g, *param_priv_key; | |
22 | const OSSL_PARAM *param_pub_key; | |
23 | BIGNUM *p = NULL, *q = NULL, *g = NULL, *priv_key = NULL, *pub_key = NULL; | |
24 | ||
25 | if (dsa == NULL) | |
26 | return 0; | |
27 | ||
28 | param_p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_P); | |
29 | param_q = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_Q); | |
30 | param_g = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_G); | |
31 | param_priv_key = | |
32 | OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_DSA_PRIV_KEY); | |
33 | param_pub_key = | |
34 | OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_DSA_PUB_KEY); | |
35 | ||
36 | /* | |
37 | * DSA documentation says that a public key must be present if a private key | |
38 | * is. | |
39 | */ | |
40 | if (param_priv_key != NULL && param_pub_key == NULL) | |
41 | return 0; | |
42 | ||
43 | if ((param_p != NULL && !OSSL_PARAM_get_BN(param_p, &p)) | |
44 | || (param_q != NULL && !OSSL_PARAM_get_BN(param_q, &q)) | |
45 | || (param_g != NULL && !OSSL_PARAM_get_BN(param_g, &g)) | |
46 | || (param_priv_key != NULL | |
47 | && !OSSL_PARAM_get_BN(param_priv_key, &priv_key)) | |
48 | || (param_pub_key != NULL | |
49 | && !OSSL_PARAM_get_BN(param_pub_key, &pub_key))) | |
50 | goto err; | |
51 | ||
52 | if (!DSA_set0_pqg(dsa, p, q, g)) | |
53 | goto err; | |
54 | p = q = g = NULL; | |
55 | ||
56 | if (pub_key != NULL && !DSA_set0_key(dsa, pub_key, priv_key)) | |
57 | goto err; | |
58 | priv_key = pub_key = NULL; | |
59 | ||
60 | return 1; | |
61 | ||
62 | err: | |
63 | BN_free(p); | |
64 | BN_free(q); | |
65 | BN_free(g); | |
66 | BN_free(priv_key); | |
67 | BN_free(pub_key); | |
68 | return 0; | |
69 | } | |
70 | ||
71 | static void *dsa_importkey(void *provctx, const OSSL_PARAM params[]) | |
72 | { | |
73 | DSA *dsa; | |
74 | ||
75 | if ((dsa = DSA_new()) == NULL | |
76 | || !params_to_key(dsa, params)) { | |
77 | DSA_free(dsa); | |
78 | dsa = NULL; | |
79 | } | |
80 | return dsa; | |
81 | } | |
82 | ||
83 | const OSSL_DISPATCH dsa_keymgmt_functions[] = { | |
84 | /* | |
85 | * TODO(3.0) When implementing OSSL_FUNC_KEYMGMT_GENKEY, remember to also | |
86 | * implement OSSL_FUNC_KEYMGMT_EXPORTKEY. | |
87 | */ | |
88 | { OSSL_FUNC_KEYMGMT_IMPORTKEY, (void (*)(void))dsa_importkey }, | |
89 | { OSSL_FUNC_KEYMGMT_FREEKEY, (void (*)(void))DSA_free }, | |
90 | { 0, NULL } | |
91 | }; |