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+.TH LIBKECCAK_SPEC_SHAKE 3 LIBKECCAK
+.SH NAME
+libkeccak_spec_shake - Configure SHAKE hashing parameters
+.SH SYNOPSIS
+.LP
+.nf
+#include <libkeccak.h>
+.P
+void
+libkeccak_spec_shake(libkeccak_spec_t *\fIspec\fP, long int \fIx\fP, long int \fId\fP);
+.fi
+.P
+Link with
+.IR -lkeccak .
+.SH DESCRIPTION
+The
+.BR libkeccak_spec_shake ()
+function sets
+.I *spec
+to specify the Keccak parameters used for SHAKE hashing
+with the semicapacity specified, in bits, via the
+.I x
+parameter, and the output size specified, in bits, via the
+.I d
+parameter.
+.SH RETURN VALUES
+The
+.BR libkeccak_spec_shake ()
+function does not return any value.
+.SH ERRORS
+The
+.BR libkeccak_spec_shake ()
+function cannot fail.
+.SH EXAMPLE
+This example configure a
+.B libkeccak_spec_t
+to specify the Keccak parameters used for SHAKE256(, 512):
+.LP
+.nf
+libkeccak_spec_t spec;
+libkeccak_spec_shake(&spec, 256, 512);
+.fi
+.SH SEE ALSO
+.BR libkeccak_spec_sha3 (3),
+.BR libkeccak_spec_rawshake (3),
+.BR libkeccak_spec_check (3),
+.BR libkeccak_generalised_spec_initialise (3),
+.BR libkeccak_state_initialise (3),
+.BR libkeccak_hmac_initialise (3)
+.SH BUGS
+Please report bugs to https://github.com/maandree/libkeccak/issues or to
+maandree@kth.se