Android_verify/third_party/android-libs/share/man/man3/X509_new.3ossl

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.\" ========================================================================
.\"
.IX Title "X509_NEW 3ossl"
.TH X509_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_new, X509_new_ex,
X509_free, X509_up_ref,
X509_chain_up_ref,
OSSL_STACK_OF_X509_free
\&\- X509 certificate ASN1 allocation and deallocation functions
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/x509.h>
\&
\& X509 *X509_new(void);
\& X509 *X509_new_ex(OSSL_LIB_CTX *libctx, const char *propq);
\& void X509_free(X509 *a);
\& int X509_up_ref(X509 *a);
\& STACK_OF(X509) *X509_chain_up_ref(STACK_OF(X509) *x);
\& void OSSL_STACK_OF_X509_free(STACK_OF(X509) *certs);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The X509 \s-1ASN1\s0 allocation routines allocate and free an
X509 structure, which represents an X509 certificate.
.PP
\&\fBX509_new_ex()\fR allocates and initializes a X509 structure with a
library context of \fIlibctx\fR, property query of \fIpropq\fR and a reference
count of \fB1\fR. Many X509 functions such as \fBX509_check_purpose()\fR, and
\&\fBX509_verify()\fR use this library context to select which providers supply the
fetched algorithms (\s-1SHA1\s0 is used internally). This created X509 object can then
be used when loading binary data using \fBd2i_X509()\fR.
.PP
\&\fBX509_new()\fR is similar to \fBX509_new_ex()\fR but sets the library context
and property query to \s-1NULL.\s0 This results in the default (\s-1NULL\s0) library context
being used for any X509 operations requiring algorithm fetches.
.PP
\&\fBX509_free()\fR decrements the reference count of \fBX509\fR structure \fBa\fR and
frees it up if the reference count is zero. If the argument is \s-1NULL,\s0
nothing is done.
.PP
\&\fBX509_up_ref()\fR increments the reference count of \fBa\fR.
.PP
\&\fBX509_chain_up_ref()\fR increases the reference count of all certificates in
chain \fBx\fR and returns a copy of the stack, or an empty stack if \fBa\fR is \s-1NULL.\s0
.PP
\&\fBOSSL_STACK_OF_X509_free()\fR deallocates the given list of pointers to
certificates after calling \fBX509_free()\fR on all its elements.
If the argument is \s-1NULL,\s0 nothing is done.
.SH "NOTES"
.IX Header "NOTES"
The function \fBX509_up_ref()\fR if useful if a certificate structure is being
used by several different operations each of which will free it up after
use: this avoids the need to duplicate the entire certificate structure.
.PP
The function \fBX509_chain_up_ref()\fR doesn't just up the reference count of
each certificate. It also returns a copy of the stack, using \fBsk_X509_dup()\fR,
but it serves a similar purpose: the returned chain persists after the
original has been freed.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
If the allocation fails, \fBX509_new()\fR returns \s-1NULL\s0 and sets an error
code that can be obtained by \fBERR_get_error\fR\|(3).
Otherwise it returns a pointer to the newly allocated structure.
.PP
\&\fBX509_up_ref()\fR returns 1 for success and 0 for failure.
.PP
\&\fBX509_chain_up_ref()\fR returns a copy of the stack or \s-1NULL\s0 if an error occurred.
.PP
\&\fBOSSL_STACK_OF_X509_free()\fR has no return value.
.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_pubkey\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_sign\fR\|(3),
\&\fBX509V3_get_d2i\fR\|(3),
\&\fBX509_verify_cert\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
\&\fBX509_new_ex()\fR was added in OpenSSL 3.0.
.PP
\&\fBOSSL_STACK_OF_X509_free()\fR was added in OpenSSL 3.2.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2002\-2024 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>.