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.\" DO NOT MODIFY THIS FILE! It was generated by gdoc.
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.TH "gnutls_x509_crt_get_key_id" 3 "3.6.8" "gnutls" "gnutls"
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.SH NAME
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gnutls_x509_crt_get_key_id \- API function
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.SH SYNOPSIS
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.B #include <gnutls/x509.h>
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.sp
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.BI "int gnutls_x509_crt_get_key_id(gnutls_x509_crt_t " crt ", unsigned int " flags ", unsigned char * " output_data ", size_t * " output_data_size ");"
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.SH ARGUMENTS
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.IP "gnutls_x509_crt_t crt" 12
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Holds the certificate
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.IP "unsigned int flags" 12
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should be one of the flags from \fBgnutls_keyid_flags_t\fP
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.IP "unsigned char * output_data" 12
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will contain the key ID
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.IP "size_t * output_data_size" 12
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holds the size of output_data (and will be
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replaced by the actual size of parameters)
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.SH "DESCRIPTION"
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This function will return a unique ID that depends on the public
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key parameters. This ID can be used in checking whether a
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certificate corresponds to the given private key.
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If the buffer provided is not long enough to hold the output, then
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*output_data_size is updated and GNUTLS_E_SHORT_MEMORY_BUFFER will
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be returned. The output will normally be a SHA\-1 hash output,
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which is 20 bytes.
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.SH "RETURNS"
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In case of failure a negative error code will be
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returned, and 0 on success.
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.SH "REPORTING BUGS"
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Report bugs to <bugs@gnutls.org>.
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.br
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Home page: https://www.gnutls.org
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.SH COPYRIGHT
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Copyright \(co 2001-2019 Free Software Foundation, Inc., and others.
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.br
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Copying and distribution of this file, with or without modification,
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are permitted in any medium without royalty provided the copyright
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notice and this notice are preserved.
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.SH "SEE ALSO"
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The full documentation for
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.B gnutls
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is maintained as a Texinfo manual.
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If the /usr/share/doc/gnutls/
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directory does not contain the HTML form visit
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.B
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.IP https://www.gnutls.org/manual/
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.PP
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