Android_verify/third_party/android-libs/share/man/man3/X509_PUBKEY_new.3ossl

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.\"
.IX Title "X509_PUBKEY_NEW 3ossl"
.TH X509_PUBKEY_NEW 3ossl "2024-09-03" "3.3.2" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
X509_PUBKEY_new_ex, X509_PUBKEY_new, X509_PUBKEY_free, X509_PUBKEY_dup,
X509_PUBKEY_set, X509_PUBKEY_get0, X509_PUBKEY_get,
d2i_PUBKEY_ex, d2i_PUBKEY, i2d_PUBKEY, d2i_PUBKEY_ex_bio, d2i_PUBKEY_bio,
d2i_PUBKEY_ex_fp, d2i_PUBKEY_fp, i2d_PUBKEY_fp, i2d_PUBKEY_bio,
X509_PUBKEY_set0_public_key, X509_PUBKEY_set0_param, X509_PUBKEY_get0_param,
X509_PUBKEY_eq \- SubjectPublicKeyInfo public key functions
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/x509.h>
\&
\& X509_PUBKEY *X509_PUBKEY_new_ex(OSSL_LIB_CTX *libctx, const char *propq);
\& X509_PUBKEY *X509_PUBKEY_new(void);
\& void X509_PUBKEY_free(X509_PUBKEY *a);
\& X509_PUBKEY *X509_PUBKEY_dup(const X509_PUBKEY *a);
\&
\& int X509_PUBKEY_set(X509_PUBKEY **x, EVP_PKEY *pkey);
\& EVP_PKEY *X509_PUBKEY_get0(const X509_PUBKEY *key);
\& EVP_PKEY *X509_PUBKEY_get(const X509_PUBKEY *key);
\&
\& EVP_PKEY *d2i_PUBKEY_ex(EVP_PKEY **a, const unsigned char **pp, long length,
\&                         OSSL_LIB_CTX *libctx, const char *propq);
\& EVP_PKEY *d2i_PUBKEY(EVP_PKEY **a, const unsigned char **pp, long length);
\& int i2d_PUBKEY(const EVP_PKEY *a, unsigned char **pp);
\&
\& EVP_PKEY *d2i_PUBKEY_ex_bio(BIO *bp, EVP_PKEY **a, OSSL_LIB_CTX *libctx,
\&                             const char *propq);
\& EVP_PKEY *d2i_PUBKEY_bio(BIO *bp, EVP_PKEY **a);
\&
\& EVP_PKEY *d2i_PUBKEY_ex_fp(FILE *fp, EVP_PKEY **a, OSSL_LIB_CTX *libctx,
\&                            const char *propq);
\& EVP_PKEY *d2i_PUBKEY_fp(FILE *fp, EVP_PKEY **a);
\&
\& int i2d_PUBKEY_fp(const FILE *fp, EVP_PKEY *pkey);
\& int i2d_PUBKEY_bio(BIO *bp, const EVP_PKEY *pkey);
\&
\& void X509_PUBKEY_set0_public_key(X509_PUBKEY *pub,
\&                                  unsigned char *penc, int penclen);
\& 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, const X509_PUBKEY *pub);
\& int X509_PUBKEY_eq(X509_PUBKEY *a, X509_PUBKEY *b);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \fBX509_PUBKEY\fR structure represents the \s-1ASN.1\s0 \fBSubjectPublicKeyInfo\fR
structure defined in \s-1RFC5280\s0 and used in certificates and certificate requests.
.PP
\&\fBX509_PUBKEY_new_ex()\fR allocates and initializes an \fBX509_PUBKEY\fR structure
associated with the given \fB\s-1OSSL_LIB_CTX\s0\fR in the \fIlibctx\fR parameter. Any
algorithm fetches associated with using the \fBX509_PUBKEY\fR object will use
the property query string \fIpropq\fR. See \*(L"\s-1ALGORITHM FETCHING\*(R"\s0 in \fBcrypto\fR\|(7) for
further information about algorithm fetching.
.PP
\&\fBX509_PUBKEY_new()\fR is the same as \fBX509_PUBKEY_new_ex()\fR except that the default
(\s-1NULL\s0) \fB\s-1OSSL_LIB_CTX\s0\fR and a \s-1NULL\s0 property query string are used.
.PP
\&\fBX509_PUBKEY_dup()\fR creates a duplicate copy of the \fBX509_PUBKEY\fR object
specified by \fIa\fR.
.PP
\&\fBX509_PUBKEY_free()\fR frees up \fBX509_PUBKEY\fR structure \fIa\fR. If \fIa\fR is \s-1NULL\s0
nothing is done.
.PP
\&\fBX509_PUBKEY_set()\fR sets the public key in \fI*x\fR to the public key contained
in the \fB\s-1EVP_PKEY\s0\fR structure \fIpkey\fR. If \fI*x\fR is not \s-1NULL\s0 any existing
public key structure will be freed.
.PP
\&\fBX509_PUBKEY_get0()\fR returns the public key contained in \fIkey\fR. The returned
value is an internal pointer which \fB\s-1MUST NOT\s0\fR be freed after use.
.PP
\&\fBX509_PUBKEY_get()\fR is similar to \fBX509_PUBKEY_get0()\fR except the reference
count on the returned key is incremented so it \fB\s-1MUST\s0\fR be freed using
\&\fBEVP_PKEY_free()\fR after use.
.PP
\&\fBd2i_PUBKEY_ex()\fR decodes an \fB\s-1EVP_PKEY\s0\fR structure using \fBSubjectPublicKeyInfo\fR
format.  Some public key decoding implementations may use cryptographic
algorithms. In this case the supplied library context \fIlibctx\fR and property
query string \fIpropq\fR are used.
\&\fBd2i_PUBKEY()\fR does the same as \fBd2i_PUBKEY_ex()\fR except that the default
library context and property query string are used.
.PP
\&\fBi2d_PUBKEY()\fR encodes an \fB\s-1EVP_PKEY\s0\fR structure using \fBSubjectPublicKeyInfo\fR
format.
.PP
\&\fBd2i_PUBKEY_bio()\fR, \fBd2i_PUBKEY_fp()\fR, \fBi2d_PUBKEY_bio()\fR and \fBi2d_PUBKEY_fp()\fR are
similar to \fBd2i_PUBKEY()\fR and \fBi2d_PUBKEY()\fR except they decode or encode using a
\&\fB\s-1BIO\s0\fR or \fB\s-1FILE\s0\fR pointer.
.PP
\&\fBd2i_PUBKEY_ex_bio()\fR and \fBd2i_PUBKEY_ex_fp()\fR are similar to \fBd2i_PUBKEY_ex()\fR except
they decode using a \fB\s-1BIO\s0\fR or \fB\s-1FILE\s0\fR pointer.
.PP
\&\fBX509_PUBKEY_set0_public_key()\fR sets the public-key encoding of \fIpub\fR
to the \fIpenclen\fR bytes contained in buffer \fIpenc\fR.
Any earlier public-key encoding in \fIpub\fR is freed.
\&\fIpenc\fR may be \s-1NULL\s0 to indicate that there is no actual public key data.
Ownership of the \fIpenc\fR argument is passed to \fIpub\fR.
.PP
\&\fBX509_PUBKEY_set0_param()\fR sets the public-key parameters of \fIpub\fR.
The \s-1OID\s0 associated with the algorithm is set to \fIaobj\fR. The type of the
algorithm parameters is set to \fItype\fR using the structure \fIpval\fR.
If \fIpenc\fR is not \s-1NULL\s0 the encoding of the public key itself is set
to the \fIpenclen\fR bytes contained in buffer \fIpenc\fR and
any earlier public-key encoding in \fIpub\fR is freed.
On success ownership of all the supplied arguments is passed to \fIpub\fR
so they must not be freed after the call.
.PP
\&\fBX509_PUBKEY_get0_param()\fR retrieves the public key parameters from \fIpub\fR,
\&\fI*ppkalg\fR is set to the associated \s-1OID\s0 and the encoding consists of
\&\fI*ppklen\fR bytes at \fI*pk\fR, \fI*pa\fR 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 \s-1NULL.\s0 All of the
retrieved pointers are internal and must not be freed after the
call.
.PP
\&\fBX509_PUBKEY_eq()\fR compares two \fBX509_PUBKEY\fR values.
.SH "NOTES"
.IX Header "NOTES"
The \fBX509_PUBKEY\fR functions can be used to encode and decode public keys
in a standard format.
.PP
In many cases applications will not call the \fBX509_PUBKEY\fR functions
directly: they will instead call wrapper functions such as \fBX509_get0_pubkey()\fR.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
If the allocation fails, \fBX509_PUBKEY_new()\fR and \fBX509_PUBKEY_dup()\fR return
\&\s-1NULL\s0 and set an error code that can be obtained by \fBERR_get_error\fR\|(3).
Otherwise they return a pointer to the newly allocated structure.
.PP
\&\fBX509_PUBKEY_free()\fR does not return a value.
.PP
\&\fBX509_PUBKEY_get0()\fR, \fBX509_PUBKEY_get()\fR, \fBd2i_PUBKEY_ex()\fR, \fBd2i_PUBKEY()\fR,
\&\fBd2i_PUBKEY_ex_bio()\fR, \fBd2i_PUBKEY_bio()\fR, \fBd2i_PUBKEY_ex_fp()\fR and \fBd2i_PUBKEY_fp()\fR
return a pointer to an \fB\s-1EVP_PKEY\s0\fR structure or \s-1NULL\s0 if an error occurs.
.PP
\&\fBi2d_PUBKEY()\fR returns the number of bytes successfully encoded or a
negative value if an error occurs.
.PP
\&\fBi2d_PUBKEY_fp()\fR and \fBi2d_PUBKEY_bio()\fR return 1 if successfully
encoded or 0 if an error occurs.
.PP
\&\fBX509_PUBKEY_set0_public_key()\fR does not return a value.
.PP
\&\fBX509_PUBKEY_set()\fR, \fBX509_PUBKEY_set0_param()\fR and \fBX509_PUBKEY_get0_param()\fR
return 1 for success and 0 if an error occurred.
.PP
\&\fBX509_PUBKEY_eq()\fR returns 1 for equal, 0 for different, and < 0 on error.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBd2i_X509\fR\|(3),
\&\fBERR_get_error\fR\|(3),
\&\fBX509_get_pubkey\fR\|(3),
.SH "HISTORY"
.IX Header "HISTORY"
The \fBX509_PUBKEY_new_ex()\fR and \fBX509_PUBKEY_eq()\fR functions were added in OpenSSL
3.0.
.PP
The \fBX509_PUBKEY_set0_public_key()\fR, \fBd2i_PUBKEY_ex_bio()\fR and \fBd2i_PUBKEY_ex_fp()\fR
functions were added in OpenSSL 3.2.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2016\-2022 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.