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+.TH ZMODMUL 3 libzahl
+.SH NAME
+zmodmul - Calculate the modular product of two big integer
+.SH SYNOPSIS
+.nf
+#include <zahl.h>
+
+void zmodmul(z_t \fIproduct\fP, z_t \fImultiplier\fP, z_t \fImultiplicand\fP, z_t \fImodulator\fP);
+.fi
+.SH DESCRIPTION
+.B zmodmul
+calculates the product of a
+.I multiplier
+and a
+.IR multiplicand ,
+modulus a
+.IR modulator ,
+and stores the result in
+.IR product .
+That is,
+.I product
+gets
+.RI ( multiplier
+⋅
+.IR multiplicand )
+Mod
+.IR modulator .
+.P
+It is safe to call
+.B zmodmul
+with non-unique parameters.
+.SH SEE ALSO
+.BR zmodpow (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)