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+.TH ZMODSQR 3 libzahl
+.SH NAME
+zsqr - Calculate a modular square of a big integer
+.SH SYNOPSIS
+.nf
+#include <zahl.h>
+
+void zmodsqr(z_t \fIsquare\fP, z_t \fIinteger\fP, z_t \fImodulator\fP);
+.fi
+.SH DESCRIPTION
+.B zmodsqr
+calculates the square of an
+.IR integer ,
+modulus a
+.IR modulator ,
+and stores the result in
+.IR square .
+That is,
+.I square
+gets
+.IR integer ².
+Mod
+.IR modulator .
+.P
+It is safe to call
+.B zmodsqr
+with non-unique parameters.
+.SH RATIONALE
+See rationle for
+.BR zmodmul (3),
+and
+.BR zsqr (3).
+.SH SEE ALSO
+.BR zmodmul (3),
+.BR zmodpow (3),
+.BR zsqr (3),
+.BR zstr (3),
+.BR zadd (3),
+.BR zsub (3),
+.BR zmul (3),
+.BR zdiv (3),
+.BR zmod (3),
+.BR zneg (3),
+.BR zabs (3),
+.BR zpow (3)