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=head1 NAME

DH_get_1024_160,
DH_get_2048_224,
DH_get_2048_256,
BN_get0_nist_prime_192,
BN_get0_nist_prime_224,
BN_get0_nist_prime_256,
BN_get0_nist_prime_384,
BN_get0_nist_prime_521,
BN_get_rfc2409_prime_768,
BN_get_rfc2409_prime_1024,
BN_get_rfc3526_prime_1536,
BN_get_rfc3526_prime_2048,
BN_get_rfc3526_prime_3072,
BN_get_rfc3526_prime_4096,
BN_get_rfc3526_prime_6144,
BN_get_rfc3526_prime_8192
- Create standardized public primes or DH pairs

=head1 SYNOPSIS

 #include <openssl/dh.h>

 const BIGNUM *BN_get0_nist_prime_192(void);
 const BIGNUM *BN_get0_nist_prime_224(void);
 const BIGNUM *BN_get0_nist_prime_256(void);
 const BIGNUM *BN_get0_nist_prime_384(void);
 const BIGNUM *BN_get0_nist_prime_521(void);

 BIGNUM *BN_get_rfc2409_prime_768(BIGNUM *bn);
 BIGNUM *BN_get_rfc2409_prime_1024(BIGNUM *bn);
 BIGNUM *BN_get_rfc3526_prime_1536(BIGNUM *bn);
 BIGNUM *BN_get_rfc3526_prime_2048(BIGNUM *bn);
 BIGNUM *BN_get_rfc3526_prime_3072(BIGNUM *bn);
 BIGNUM *BN_get_rfc3526_prime_4096(BIGNUM *bn);
 BIGNUM *BN_get_rfc3526_prime_6144(BIGNUM *bn);
 BIGNUM *BN_get_rfc3526_prime_8192(BIGNUM *bn);

The following functions have been deprecated since OpenSSL 3.0, and can be
hidden entirely by defining B<OPENSSL_API_COMPAT> with a suitable version value,
see L<openssl_user_macros(7)>:

 #include <openssl/dh.h>

 DH *DH_get_1024_160(void);
 DH *DH_get_2048_224(void);
 DH *DH_get_2048_256(void);

=head1 DESCRIPTION

DH_get_1024_160(), DH_get_2048_224(), and DH_get_2048_256() each return
a DH object for the IETF RFC 5114 value. These functions are deprecated.
Applications should instead use EVP_PKEY_CTX_set_dh_rfc5114() and
EVP_PKEY_CTX_set_dhx_rfc5114() as described in L<EVP_PKEY_CTX_ctrl(3)> or
by setting the B<OSSL_PKEY_PARAM_GROUP_NAME> as specified in
L<EVP_PKEY-DH(7)/DH parameters>) to one of "dh_1024_160", "dh_2048_224" or
"dh_2048_256".

BN_get0_nist_prime_192(), BN_get0_nist_prime_224(), BN_get0_nist_prime_256(),
BN_get0_nist_prime_384(), and BN_get0_nist_prime_521() functions return
a BIGNUM for the specific NIST prime curve (e.g., P-256).

BN_get_rfc2409_prime_768(), BN_get_rfc2409_prime_1024(),
BN_get_rfc3526_prime_1536(), BN_get_rfc3526_prime_2048(),
BN_get_rfc3526_prime_3072(), BN_get_rfc3526_prime_4096(),
BN_get_rfc3526_prime_6144(), and BN_get_rfc3526_prime_8192() functions
return a BIGNUM for the specified size from IETF RFC 2409.  If B<bn>
is not NULL, the BIGNUM will be set into that location as well.

=head1 RETURN VALUES

Defined above.

=head1 HISTORY

The functions DH_get_1024_160(), DH_get_2048_224() and DH_get_2048_256() were
deprecated in OpenSSL 3.0.

=head1 COPYRIGHT

Copyright 2016-2021 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the "License").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file LICENSE in the source distribution or at
L<https://www.openssl.org/source/license.html>.

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