mirror of
https://github.com/openssl/openssl.git
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112 lines
4.0 KiB
Plaintext
112 lines
4.0 KiB
Plaintext
=pod
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=head1 NAME
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X509_PUBKEY_new, X509_PUBKEY_free, X509_PUBKEY_set, X509_PUBKEY_get0,
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X509_PUBKEY_get, d2i_PUBKEY, i2d_PUBKEY, d2i_PUBKEY_bio, d2i_PUBKEY_fp,
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i2d_PUBKEY_fp, i2d_PUBKEY_bio, X509_PUBKEY_set0_param,
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X509_PUBKEY_get0_param - 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(void);
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void X509_PUBKEY_free(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(X509_PUBKEY *key);
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EVP_PKEY *X509_PUBKEY_get(X509_PUBKEY *key);
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EVP_PKEY *d2i_PUBKEY(EVP_PKEY **a, const unsigned char **pp, long length);
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int i2d_PUBKEY(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(FILE *fp, EVP_PKEY *pkey);
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int i2d_PUBKEY_bio(BIO *bp, EVP_PKEY *pkey);
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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, X509_PUBKEY *pub);
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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() allocates and initializes an B<X509_PUBKEY> structure.
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X509_PUBKEY_free() frees up B<X509_PUBKEY> structure B<a>. If B<a> is NULL
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nothing is done.
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X509_PUBKEY_set() sets the public key in B<*x> to the public key contained
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in the B<EVP_PKEY> structure B<pkey>. If B<*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 B<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() and i2d_PUBKEY() decode and encode an B<EVP_PKEY> structure
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using B<SubjectPublicKeyInfo> format. They otherise follow the conventions of
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other ASN.1 functions such as d2i_X509().
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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_param() sets the public key parameters of B<pub>. The
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OID associated with the algorithm is set to B<aobj>. The type of the
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algorithm parameters is set to B<type> using the structure B<pval>.
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The encoding of the public key itself is set to the B<penclen>
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bytes contained in buffer B<penc>. On success ownership of all the supplied
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parameters is passed to B<pub> so they must not be freed after the
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call.
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X509_PUBKEY_get0_param() retrieves the public key parameters from B<pub>,
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B<*ppkalg> is set to the associated OID and the encoding consists of
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B<*ppklen> bytes at B<*pk>, B<*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 B<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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=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() returns B<NULL> and sets an error
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code that can be obtained by L<ERR_get_error(3)>.
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Otherwise it returns 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 B<NULL> if an error occurs.
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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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=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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=cut
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