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738ee1819e
DH_set0_pqg() is now responsible for caching the nid, q and length. DH with or without named safe prime groups now default to using the maximum private key length (BN_num_bits(q) - 1) when generating a DH private key. The code is now shared between fips and non fips mode for DH key generation. The OSSL_PKEY_PARAM_DH_PRIV_LEN parameter can be used during keygen to override the maximum private key length to be in the range (2 * strength ... bits(q) - 1). Where the strength depends on the length of p. Added q = (p - 1) / 2 safe prime BIGNUMS so that the code is data driven (To simplify adding new names). The BIGNUMS were code generated. Fix error in documented return value for DH_get_nid Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/11562)
52 lines
1.5 KiB
Plaintext
52 lines
1.5 KiB
Plaintext
=pod
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=head1 NAME
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DH_new_by_nid, DH_get_nid - create or get DH named parameters
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=head1 SYNOPSIS
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#include <openssl/dh.h>
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DH *DH_new_by_nid(int nid);
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Deprecated since OpenSSL 3.0, can be hidden entirely by defining
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B<OPENSSL_API_COMPAT> with a suitable version value, see
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L<openssl_user_macros(7)>:
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int DH_get_nid(const DH *dh);
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=head1 DESCRIPTION
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DH_new_by_nid() creates and returns a DH structure containing named parameters
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B<nid>. Currently B<nid> must be B<NID_ffdhe2048>, B<NID_ffdhe3072>,
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B<NID_ffdhe4096>, B<NID_ffdhe6144>, B<NID_ffdhe8192>,
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B<NID_modp_1536>, B<NID_modp_2048>, B<NID_modp_3072>,
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B<NID_modp_4096>, B<NID_modp_6144> or B<NID_modp_8192>.
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DH_get_nid() determines if the parameters contained in B<dh> match
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any named safe prime group. It returns the NID corresponding to the matching
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parameters or B<NID_undef> if there is no match.
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This function is deprecated.
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=head1 RETURN VALUES
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DH_new_by_nid() returns a set of DH parameters or B<NULL> if an error occurred.
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DH_get_nid() returns the NID of the matching set of parameters for p and g
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and optionally q, otherwise it returns B<NID_undef> if there is no match.
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=head1 HISTORY
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The DH_get_nid() function was deprecated in OpenSSL 3.0.
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=head1 COPYRIGHT
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Copyright 2017-2020 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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