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X509_set_pubkey.3

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.\" ========================================================================
.\"
.IX Title "X509_GET_PUBKEY 3"
.TH X509_GET_PUBKEY 3 "2023-09-11" "1.1.1w" "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_get_pubkey, X509_get0_pubkey, X509_set_pubkey, X509_get_X509_PUBKEY, X509_REQ_get_pubkey, X509_REQ_get0_pubkey, X509_REQ_set_pubkey, X509_REQ_get_X509_PUBKEY \- get or set certificate or certificate request public key
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/x509.h>
\&
\& EVP_PKEY *X509_get_pubkey(X509 *x);
\& EVP_PKEY *X509_get0_pubkey(const X509 *x);
\& int X509_set_pubkey(X509 *x, EVP_PKEY *pkey);
\& X509_PUBKEY *X509_get_X509_PUBKEY(X509 *x);
\&
\& EVP_PKEY *X509_REQ_get_pubkey(X509_REQ *req);
\& EVP_PKEY *X509_REQ_get0_pubkey(X509_REQ *req);
\& int X509_REQ_set_pubkey(X509_REQ *x, EVP_PKEY *pkey);
\& X509_PUBKEY *X509_REQ_get_X509_PUBKEY(X509_REQ *x);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBX509_get_pubkey()\fR attempts to decode the public key for certificate \fBx\fR. If
successful it returns the public key as an \fB\s-1EVP_PKEY\s0\fR pointer with its
reference count incremented: this means the returned key must be freed up
after use. \fBX509_get0_pubkey()\fR is similar except it does \fBnot\fR increment
the reference count of the returned \fB\s-1EVP_PKEY\s0\fR so it must not be freed up
after use.
.PP
\&\fBX509_get_X509_PUBKEY()\fR returns an internal pointer to the \fBX509_PUBKEY\fR
structure which encodes the certificate of \fBx\fR. The returned value
must not be freed up after use.
.PP
\&\fBX509_set_pubkey()\fR attempts to set the public key for certificate \fBx\fR to
\&\fBpkey\fR. The key \fBpkey\fR should be freed up after use.
.PP
\&\fBX509_REQ_get_pubkey()\fR, \fBX509_REQ_get0_pubkey()\fR, \fBX509_REQ_set_pubkey()\fR and
\&\fBX509_REQ_get_X509_PUBKEY()\fR are similar but operate on certificate request \fBreq\fR.
.SH "NOTES"
.IX Header "NOTES"
The first time a public key is decoded the \fB\s-1EVP_PKEY\s0\fR structure is
cached in the certificate or certificate request itself. Subsequent calls
return the cached structure with its reference count incremented to
improve performance.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBX509_get_pubkey()\fR, \fBX509_get0_pubkey()\fR, \fBX509_get_X509_PUBKEY()\fR,
\&\fBX509_REQ_get_pubkey()\fR and \fBX509_REQ_get_X509_PUBKEY()\fR return a public key or
\&\fB\s-1NULL\s0\fR if an error occurred.
.PP
\&\fBX509_set_pubkey()\fR and \fBX509_REQ_set_pubkey()\fR return 1 for success and 0
for failure.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBd2i_X509\fR\|(3),
\&\fBERR_get_error\fR\|(3),
\&\fBX509_CRL_get0_by_serial\fR\|(3),
\&\fBX509_get0_signature\fR\|(3),
\&\fBX509_get_ext_d2i\fR\|(3),
\&\fBX509_get_extension_flags\fR\|(3),
\&\fBX509_get_subject_name\fR\|(3),
\&\fBX509_get_version\fR\|(3),
\&\fBX509_NAME_add_entry_by_txt\fR\|(3),
\&\fBX509_NAME_ENTRY_get_object\fR\|(3),
\&\fBX509_NAME_get_index_by_NID\fR\|(3),
\&\fBX509_NAME_print_ex\fR\|(3),
\&\fBX509_new\fR\|(3),
\&\fBX509_sign\fR\|(3),
\&\fBX509V3_get_d2i\fR\|(3),
\&\fBX509_verify_cert\fR\|(3)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2015\-2016 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (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>.

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ASN1_STRING_set.3

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