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DH_GET0_PQG(3)                      OpenSSL                     DH_GET0_PQG(3)
NAME
       DH_get0_pqg, DH_set0_pqg, DH_get0_key, DH_set0_key, DH_get0_p,
       DH_get0_q, DH_get0_g, DH_get0_priv_key, DH_get0_pub_key,
       DH_clear_flags, DH_test_flags, DH_set_flags, DH_get0_engine,
       DH_get_length, DH_set_length - Routines for getting and setting data in
       a DH object
SYNOPSIS
        #include <openssl/dh.h>
        void DH_get0_pqg(const DH *dh,
                         const BIGNUM **p, const BIGNUM **q, const BIGNUM **g);
        int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g);
        void DH_get0_key(const DH *dh,
                         const BIGNUM **pub_key, const BIGNUM **priv_key);
        int DH_set0_key(DH *dh, BIGNUM *pub_key, BIGNUM *priv_key);
        const BIGNUM *DH_get0_p(const DH *dh);
        const BIGNUM *DH_get0_q(const DH *dh);
        const BIGNUM *DH_get0_g(const DH *dh);
        const BIGNUM *DH_get0_priv_key(const DH *dh);
        const BIGNUM *DH_get0_pub_key(const DH *dh);
        void DH_clear_flags(DH *dh, int flags);
        int DH_test_flags(const DH *dh, int flags);
        void DH_set_flags(DH *dh, int flags);
        ENGINE *DH_get0_engine(DH *d);
        long DH_get_length(const DH *dh);
        int DH_set_length(DH *dh, long length);
DESCRIPTION
       A DH object contains the parameters p, q and g. Note that the q
       parameter is optional. It also contains a public key (pub_key) and
       (optionally) a private key (priv_key).
       The p, q and g parameters can be obtained by calling DH_get0_pqg().  If
       the parameters have not yet been set then *p, *q and *g will be set to
       NULL. Otherwise they are set to pointers to their respective values.
       These point directly to the internal representations of the values and
       therefore should not be freed directly.  Any of the out parameters p,
       q, and g can be NULL, in which case no value will be returned for that
       parameter.
       The p, q and g values can be set by calling DH_set0_pqg() and passing
       the new values for p, q and g as parameters to the function. Calling
       this function transfers the memory management of the values to the DH
       object, and therefore the values that have been passed in should not be
       freed directly after this function has been called. The q parameter may
       be NULL.
       To get the public and private key values use the DH_get0_key()
       function. A pointer to the public key will be stored in *pub_key, and a
       pointer to the private key will be stored in *priv_key. Either may be
       NULL if they have not been set yet, although if the private key has
       been set then the public key must be. The values point to the internal
       representation of the public key and private key values. This memory
       should not be freed directly.  Any of the out parameters pub_key and
       priv_key can be NULL, in which case no value will be returned for that
       parameter.
       The public and private key values can be set using DH_set0_key().
       Either parameter may be NULL, which means the corresponding DH field is
       left untouched. As with DH_set0_pqg() this function transfers the
       memory management of the key values to the DH object, and therefore
       they should not be freed directly after this function has been called.
       Any of the values p, q, g, priv_key, and pub_key can also be retrieved
       separately by the corresponding function DH_get0_p(), DH_get0_q(),
       DH_get0_g(), DH_get0_priv_key(), and DH_get0_pub_key(), respectively.
       DH_set_flags() sets the flags in the flags parameter on the DH object.
       Multiple flags can be passed in one go (bitwise ORed together). Any
       flags that are already set are left set. DH_test_flags() tests to see
       whether the flags passed in the flags parameter are currently set in
       the DH object. Multiple flags can be tested in one go. All flags that
       are currently set are returned, or zero if none of the flags are set.
       DH_clear_flags() clears the specified flags within the DH object.
       DH_get0_engine() returns a handle to the ENGINE that has been set for
       this DH object, or NULL if no such ENGINE has been set.
       The DH_get_length() and DH_set_length() functions get and set the
       optional length parameter associated with this DH object. If the length
       is nonzero then it is used, otherwise it is ignored. The length
       parameter indicates the length of the secret exponent (private key) in
       bits.
NOTES
       Values retrieved with DH_get0_key() are owned by the DH object used in
       the call and may therefore not be passed to DH_set0_key().  If needed,
       duplicate the received value using BN_dup() and pass the duplicate.
       The same applies to DH_get0_pqg() and DH_set0_pqg().
RETURN VALUES
       DH_set0_pqg() and DH_set0_key() return 1 on success or 0 on failure.
       DH_get0_p(), DH_get0_q(), DH_get0_g(), DH_get0_priv_key(), and
       DH_get0_pub_key() return the respective value, or NULL if it is unset.
       DH_test_flags() returns the current state of the flags in the DH
       object.
       DH_get0_engine() returns the ENGINE set for the DH object or NULL if no
       ENGINE has been set.
       DH_get_length() returns the length of the secret exponent (private key)
       in bits, or zero if no such length has been explicitly set.
SEE ALSO
       DH_new(3), DH_new(3), DH_generate_parameters(3), DH_generate_key(3),
       DH_set_method(3), DH_size(3), DH_meth_new(3)
HISTORY
       The functions described here were added in OpenSSL 1.1.0.
COPYRIGHT
       Copyright 2016-2020 The OpenSSL Project Authors. All Rights Reserved.
       Licensed under the OpenSSL license (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
       <https://www.openssl.org/source/license.html>;.
1.1.1k                            2021-03-25                    DH_GET0_PQG(3)