2 * Copyright 2017-2020 The OpenSSL Project Authors. All Rights Reserved.
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
10 /* DH parameters from RFC7919 and RFC3526 */
13 * DH low level APIs are deprecated for public use, but still ok for
16 #include "internal/deprecated.h"
19 #include "internal/cryptlib.h"
20 #include "internal/ffc.h"
22 #include <openssl/bn.h>
23 #include <openssl/objects.h>
24 #include "internal/nelem.h"
25 #include "crypto/dh.h"
26 #include "e_os.h" /* strcasecmp */
28 static DH
*dh_param_init(OSSL_LIB_CTX
*libctx
, const DH_NAMED_GROUP
*group
)
30 DH
*dh
= dh_new_ex(libctx
);
35 ossl_ffc_named_group_set_pqg(&dh
->params
, group
);
36 dh
->params
.nid
= ossl_ffc_named_group_get_uid(group
);
37 dh
->length
= BN_num_bits(dh
->params
.q
);
42 DH
*dh_new_by_nid_ex(OSSL_LIB_CTX
*libctx
, int nid
)
44 const DH_NAMED_GROUP
*group
;
46 if ((group
= ossl_ffc_uid_to_dh_named_group(nid
)) != NULL
)
47 return dh_param_init(libctx
, group
);
49 ERR_raise(ERR_LIB_DH
, DH_R_INVALID_PARAMETER_NID
);
53 DH
*DH_new_by_nid(int nid
)
55 return dh_new_by_nid_ex(NULL
, nid
);
58 void dh_cache_named_group(DH
*dh
)
60 const DH_NAMED_GROUP
*group
;
65 dh
->params
.nid
= NID_undef
; /* flush cached value */
67 /* Exit if p or g is not set */
68 if (dh
->params
.p
== NULL
69 || dh
->params
.g
== NULL
)
72 if ((group
= ossl_ffc_numbers_to_dh_named_group(dh
->params
.p
,
74 dh
->params
.g
)) != NULL
) {
75 if (dh
->params
.q
== NULL
)
76 dh
->params
.q
= (BIGNUM
*)ossl_ffc_named_group_get_q(group
);
78 dh
->params
.nid
= ossl_ffc_named_group_get_uid(group
);
79 dh
->length
= BN_num_bits(dh
->params
.q
);
84 int DH_get_nid(const DH
*dh
)
89 return dh
->params
.nid
;