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Edit File: SSL_load_client_CA_file.3ssl

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.\" ========================================================================
.\"
.IX Title "SSL_load_client_CA_file 3"
.TH SSL_load_client_CA_file 3 "2019-12-20" "1.0.2u" "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"
SSL_load_client_CA_file \- load certificate names from file
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/ssl.h>
\&
\& STACK_OF(X509_NAME) *SSL_load_client_CA_file(const char *file);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBSSL_load_client_CA_file()\fR reads certificates from \fBfile\fR and returns
a \s-1STACK_OF\s0(X509_NAME) with the subject names found.
.SH "NOTES"
.IX Header "NOTES"
\&\fBSSL_load_client_CA_file()\fR reads a file of \s-1PEM\s0 formatted certificates and
extracts the X509_NAMES of the certificates found. While the name suggests
the specific usage as support function for
\&\fBSSL_CTX_set_client_CA_list\fR\|(3),
it is not limited to \s-1CA\s0 certificates.
.SH "EXAMPLES"
.IX Header "EXAMPLES"
Load names of CAs from file and use it as a client \s-1CA\s0 list:
.PP
.Vb 2
\& SSL_CTX *ctx;
\& STACK_OF(X509_NAME) *cert_names;
\&
\& ... 
\& cert_names = SSL_load_client_CA_file("/path/to/CAfile.pem");
\& if (cert_names != NULL)
\&   SSL_CTX_set_client_CA_list(ctx, cert_names);
\& else
\&   error_handling();
\& ...
.Ve
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
The following return values can occur:
.IP "\s-1NULL\s0" 4
.IX Item "NULL"
The operation failed, check out the error stack for the reason.
.IP "Pointer to \s-1STACK_OF\s0(X509_NAME)" 4
.IX Item "Pointer to STACK_OF(X509_NAME)"
Pointer to the subject names of the successfully read certificates.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBssl\fR\|(3),
\&\fBSSL_CTX_set_client_CA_list\fR\|(3)