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X509_PUBKEY_NEW(3)		    OpenSSL		    X509_PUBKEY_NEW(3)

NAME
       X509_PUBKEY_new,	X509_PUBKEY_free, X509_PUBKEY_set, X509_PUBKEY_get0,
       X509_PUBKEY_get,	d2i_PUBKEY, i2d_PUBKEY,	d2i_PUBKEY_bio,	d2i_PUBKEY_fp,
       i2d_PUBKEY_fp, i2d_PUBKEY_bio, X509_PUBKEY_set0_param,
       X509_PUBKEY_get0_param -	SubjectPublicKeyInfo public key	functions

SYNOPSIS
	#include <openssl/x509.h>

	X509_PUBKEY *X509_PUBKEY_new(void);
	void X509_PUBKEY_free(X509_PUBKEY *a);

	int X509_PUBKEY_set(X509_PUBKEY	**x, EVP_PKEY *pkey);
	EVP_PKEY *X509_PUBKEY_get0(X509_PUBKEY *key);
	EVP_PKEY *X509_PUBKEY_get(X509_PUBKEY *key);

	EVP_PKEY *d2i_PUBKEY(EVP_PKEY **a, const unsigned char **pp, long length);
	int i2d_PUBKEY(EVP_PKEY	*a, unsigned char **pp);

	EVP_PKEY *d2i_PUBKEY_bio(BIO *bp, EVP_PKEY **a);
	EVP_PKEY *d2i_PUBKEY_fp(FILE *fp, EVP_PKEY **a);

	int i2d_PUBKEY_fp(FILE *fp, EVP_PKEY *pkey);
	int i2d_PUBKEY_bio(BIO *bp, EVP_PKEY *pkey);

	int X509_PUBKEY_set0_param(X509_PUBKEY *pub, ASN1_OBJECT *aobj,
				   int ptype, void *pval,
				   unsigned char *penc,	int penclen);
	int X509_PUBKEY_get0_param(ASN1_OBJECT **ppkalg,
				   const unsigned char **pk, int *ppklen,
				   X509_ALGOR **pa, X509_PUBKEY	*pub);

DESCRIPTION
       The X509_PUBKEY structure represents the	ASN.1 SubjectPublicKeyInfo
       structure defined in RFC5280 and	used in	certificates and certificate
       requests.

       X509_PUBKEY_new() allocates and initializes an X509_PUBKEY structure.

       X509_PUBKEY_free() frees	up X509_PUBKEY structure a. If a is NULL
       nothing is done.

       X509_PUBKEY_set() sets the public key in	*x to the public key contained
       in the EVP_PKEY structure pkey. If *x is	not NULL any existing public
       key structure will be freed.

       X509_PUBKEY_get0() returns the public key contained in key. The
       returned	value is an internal pointer which MUST	NOT be freed after
       use.

       X509_PUBKEY_get() is similar to X509_PUBKEY_get0() except the reference
       count on	the returned key is incremented	so it MUST be freed using
       EVP_PKEY_free() after use.

       d2i_PUBKEY() and	i2d_PUBKEY() decode and	encode an EVP_PKEY structure
       using SubjectPublicKeyInfo format. They otherwise follow	the
       conventions of other ASN.1 functions such as d2i_X509().

       d2i_PUBKEY_bio(), d2i_PUBKEY_fp(), i2d_PUBKEY_bio() and i2d_PUBKEY_fp()
       are similar to d2i_PUBKEY() and i2d_PUBKEY() except they	decode or
       encode using a BIO or FILE pointer.

       X509_PUBKEY_set0_param()	sets the public	key parameters of pub. The OID
       associated with the algorithm is	set to aobj. The type of the algorithm
       parameters is set to type using the structure pval.  The	encoding of
       the public key itself is	set to the penclen bytes contained in buffer
       penc. On	success	ownership of all the supplied parameters is passed to
       pub so they must	not be freed after the call.

       X509_PUBKEY_get0_param()	retrieves the public key parameters from pub,
       *ppkalg is set to the associated	OID and	the encoding consists of
       *ppklen bytes at	*pk, *pa is set	to the associated AlgorithmIdentifier
       for the public key. If the value	of any of these	parameters is not
       required	it can be set to NULL. All of the retrieved pointers are
       internal	and must not be	freed after the	call.

NOTES
       The X509_PUBKEY functions can be	used to	encode and decode public keys
       in a standard format.

       In many cases applications will not call	the X509_PUBKEY	functions
       directly: they will instead call	wrapper	functions such as
       X509_get0_pubkey().

RETURN VALUES
       If the allocation fails,	X509_PUBKEY_new() returns NULL and sets	an
       error code that can be obtained by ERR_get_error(3).

       Otherwise it returns a pointer to the newly allocated structure.

       X509_PUBKEY_free() does not return a value.

       X509_PUBKEY_get0() and X509_PUBKEY_get()	return a pointer to an
       EVP_PKEY	structure or NULL if an	error occurs.

       X509_PUBKEY_set(), X509_PUBKEY_set0_param() and
       X509_PUBKEY_get0_param()	return 1 for success and 0 if an error
       occurred.

SEE ALSO
       d2i_X509(3), ERR_get_error(3), X509_get_pubkey(3),

COPYRIGHT
       Copyright 2016 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		    X509_PUBKEY_NEW(3)
NAME | SYNOPSIS | DESCRIPTION | NOTES | RETURN VALUES | SEE ALSO | COPYRIGHT

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