mirror of https://github.com/openssl/openssl
165 lines
6.4 KiB
Plaintext
165 lines
6.4 KiB
Plaintext
=pod
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=head1 NAME
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X509_PUBKEY_new_ex, X509_PUBKEY_new, X509_PUBKEY_free, X509_PUBKEY_dup,
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X509_PUBKEY_set, X509_PUBKEY_get0, X509_PUBKEY_get,
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d2i_PUBKEY_ex, d2i_PUBKEY, i2d_PUBKEY, d2i_PUBKEY_bio, d2i_PUBKEY_fp,
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i2d_PUBKEY_fp, i2d_PUBKEY_bio, X509_PUBKEY_set0_public_key,
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X509_PUBKEY_set0_param, X509_PUBKEY_get0_param,
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X509_PUBKEY_eq - SubjectPublicKeyInfo public key functions
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=head1 SYNOPSIS
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#include <openssl/x509.h>
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X509_PUBKEY *X509_PUBKEY_new_ex(OSSL_LIB_CTX *libctx, const char *propq);
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X509_PUBKEY *X509_PUBKEY_new(void);
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void X509_PUBKEY_free(X509_PUBKEY *a);
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X509_PUBKEY *X509_PUBKEY_dup(const X509_PUBKEY *a);
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int X509_PUBKEY_set(X509_PUBKEY **x, EVP_PKEY *pkey);
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EVP_PKEY *X509_PUBKEY_get0(const X509_PUBKEY *key);
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EVP_PKEY *X509_PUBKEY_get(const X509_PUBKEY *key);
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EVP_PKEY *d2i_PUBKEY_ex(EVP_PKEY **a, const unsigned char **pp, long length,
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OSSL_LIB_CTX *libctx, const char *propq);
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EVP_PKEY *d2i_PUBKEY(EVP_PKEY **a, const unsigned char **pp, long length);
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int i2d_PUBKEY(const EVP_PKEY *a, unsigned char **pp);
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EVP_PKEY *d2i_PUBKEY_bio(BIO *bp, EVP_PKEY **a);
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EVP_PKEY *d2i_PUBKEY_fp(FILE *fp, EVP_PKEY **a);
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int i2d_PUBKEY_fp(const FILE *fp, EVP_PKEY *pkey);
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int i2d_PUBKEY_bio(BIO *bp, const EVP_PKEY *pkey);
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void X509_PUBKEY_set0_public_key(X509_PUBKEY *pub,
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unsigned char *penc, int penclen);
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int X509_PUBKEY_set0_param(X509_PUBKEY *pub, ASN1_OBJECT *aobj,
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int ptype, void *pval,
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unsigned char *penc, int penclen);
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int X509_PUBKEY_get0_param(ASN1_OBJECT **ppkalg,
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const unsigned char **pk, int *ppklen,
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X509_ALGOR **pa, const X509_PUBKEY *pub);
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int X509_PUBKEY_eq(X509_PUBKEY *a, X509_PUBKEY *b);
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=head1 DESCRIPTION
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The B<X509_PUBKEY> structure represents the ASN.1 B<SubjectPublicKeyInfo>
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structure defined in RFC5280 and used in certificates and certificate requests.
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X509_PUBKEY_new_ex() allocates and initializes an B<X509_PUBKEY> structure
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associated with the given B<OSSL_LIB_CTX> in the I<libctx> parameter. Any
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algorithm fetches associated with using the B<X509_PUBKEY> object will use
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the property query string I<propq>. See L<crypto(7)/ALGORITHM FETCHING> for
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further information about algorithm fetching.
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X509_PUBKEY_new() is the same as X509_PUBKEY_new_ex() except that the default
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(NULL) B<OSSL_LIB_CTX> and a NULL property query string are used.
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X509_PUBKEY_dup() creates a duplicate copy of the B<X509_PUBKEY> object
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specified by I<a>.
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X509_PUBKEY_free() frees up B<X509_PUBKEY> structure I<a>. If I<a> is NULL
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nothing is done.
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X509_PUBKEY_set() sets the public key in I<*x> to the public key contained
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in the B<EVP_PKEY> structure I<pkey>. If I<*x> is not NULL any existing
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public key structure will be freed.
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X509_PUBKEY_get0() returns the public key contained in I<key>. The returned
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value is an internal pointer which B<MUST NOT> be freed after use.
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X509_PUBKEY_get() is similar to X509_PUBKEY_get0() except the reference
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count on the returned key is incremented so it B<MUST> be freed using
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EVP_PKEY_free() after use.
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d2i_PUBKEY_ex() decodes an B<EVP_PKEY> structure using B<SubjectPublicKeyInfo>
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format. Some public key decoding implementations may use cryptographic
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algorithms. In this case the supplied library context I<libctx> and property
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query string I<propq> are used.
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d2i_PUBKEY() does the same as d2i_PUBKEY_ex() except that the default
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library context and property query string are used.
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i2d_PUBKEY() encodes an B<EVP_PKEY> structure using B<SubjectPublicKeyInfo>
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format.
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d2i_PUBKEY_bio(), d2i_PUBKEY_fp(), i2d_PUBKEY_bio() and i2d_PUBKEY_fp() are
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similar to d2i_PUBKEY() and i2d_PUBKEY() except they decode or encode using a
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B<BIO> or B<FILE> pointer.
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X509_PUBKEY_set0_public_key() sets the public-key encoding of I<pub>
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to the I<penclen> bytes contained in buffer I<penc>.
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Any earlier public-key encoding in I<pub> is freed.
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I<penc> may be NULL to indicate that there is no actual public key data.
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Ownership of the I<penc> argument is passed to I<pub>.
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X509_PUBKEY_set0_param() sets the public-key parameters of I<pub>.
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The OID associated with the algorithm is set to I<aobj>. The type of the
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algorithm parameters is set to I<type> using the structure I<pval>.
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If I<penc> is not NULL the encoding of the public key itself is set
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to the I<penclen> bytes contained in buffer I<penc> and
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any earlier public-key encoding in I<pub> is freed.
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On success ownership of all the supplied arguments is passed to I<pub>
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so they must not be freed after the call.
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X509_PUBKEY_get0_param() retrieves the public key parameters from I<pub>,
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I<*ppkalg> is set to the associated OID and the encoding consists of
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I<*ppklen> bytes at I<*pk>, I<*pa> is set to the associated
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AlgorithmIdentifier for the public key. If the value of any of these
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parameters is not required it can be set to NULL. All of the
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retrieved pointers are internal and must not be freed after the
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call.
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X509_PUBKEY_eq() compares two B<X509_PUBKEY> values.
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=head1 NOTES
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The B<X509_PUBKEY> functions can be used to encode and decode public keys
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in a standard format.
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In many cases applications will not call the B<X509_PUBKEY> functions
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directly: they will instead call wrapper functions such as X509_get0_pubkey().
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=head1 RETURN VALUES
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If the allocation fails, X509_PUBKEY_new() and X509_PUBKEY_dup() return
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NULL and set an error code that can be obtained by L<ERR_get_error(3)>.
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Otherwise they return a pointer to the newly allocated structure.
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X509_PUBKEY_free() does not return a value.
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X509_PUBKEY_get0() and X509_PUBKEY_get() return a pointer to an B<EVP_PKEY>
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structure or NULL if an error occurs.
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X509_PUBKEY_set0_public_key() does not return a value.
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X509_PUBKEY_set(), X509_PUBKEY_set0_param() and X509_PUBKEY_get0_param()
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return 1 for success and 0 if an error occurred.
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X509_PUBKEY_eq() returns 1 for equal, 0 for different, and < 0 on error.
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=head1 SEE ALSO
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L<d2i_X509(3)>,
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L<ERR_get_error(3)>,
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L<X509_get_pubkey(3)>,
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=head1 HISTORY
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The X509_PUBKEY_new_ex() and X509_PUBKEY_eq() functions were added in OpenSSL
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3.0.
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X509_PUBKEY_set0_public_key() was added in OpenSSL 3.2.
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=head1 COPYRIGHT
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Copyright 2016-2021 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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