2 * Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (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
11 #include "internal/cryptlib.h"
13 #include <openssl/bn.h>
14 #include <openssl/objects.h>
15 #include "internal/bn_dh.h"
17 static DH
*dh_param_init(const BIGNUM
*p
, int32_t nbits
)
23 dh
->g
= (BIGNUM
*)&_bignum_const_2
;
28 DH
*DH_new_by_nid(int nid
)
32 return dh_param_init(&_bignum_ffdhe2048_p
, 225);
34 return dh_param_init(&_bignum_ffdhe3072_p
, 275);
36 return dh_param_init(&_bignum_ffdhe4096_p
, 325);
38 return dh_param_init(&_bignum_ffdhe6144_p
, 375);
40 return dh_param_init(&_bignum_ffdhe8192_p
, 400);
42 DHerr(DH_F_DH_NEW_BY_NID
, DH_R_INVALID_PARAMETER_NID
);
47 int DH_get_nid(const DH
*dh
)
51 if (BN_get_word(dh
->g
) != 2)
53 if (!BN_cmp(dh
->p
, &_bignum_ffdhe2048_p
))
55 else if (!BN_cmp(dh
->p
, &_bignum_ffdhe3072_p
))
57 else if (!BN_cmp(dh
->p
, &_bignum_ffdhe4096_p
))
59 else if (!BN_cmp(dh
->p
, &_bignum_ffdhe6144_p
))
61 else if (!BN_cmp(dh
->p
, &_bignum_ffdhe8192_p
))
66 BIGNUM
*q
= BN_dup(dh
->p
);
68 /* Check q = p * 2 + 1 we already know q is odd, so just shift right */
69 if (q
== NULL
|| !BN_rshift1(q
, q
) || !BN_cmp(dh
->q
, q
)) {