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mp.h: define mpnrand

--- a/sys/include/mp.h

+++ b/sys/include/mp.h

@@ -38,6 +38,8 @@

 /* random bits */

 mpint*	mprand(int bits, void (*gen)(uchar*, int), mpint *b);

+/* return uniform random [0..n-1] */

+mmpint*	mpnrand(mpint *n, void (*gen)(uchar*, int), mpint *b)

 /* conversion */

 mpint*	strtomp(char*, char**, int, mpint*);	/* ascii */

-- 

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