diff libtommath/etc/mont.c @ 297:79bf1023cf11 agent-client

propagate from branch 'au.asn.ucc.matt.dropbear' (head 0501e6f661b5415eb76f3b312d183c3adfbfb712) to branch 'au.asn.ucc.matt.dropbear.cli-agent' (head 01038174ec27245b51bd43a66c01ad930880f67b)
author Matt Johnston <matt@ucc.asn.au>
date Tue, 21 Mar 2006 16:20:59 +0000
parents eed26cff980b
children 5ff8218bcee9
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line diff
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libtommath/etc/mont.c	Tue Mar 21 16:20:59 2006 +0000
@@ -0,0 +1,46 @@
+/* tests the montgomery routines */
+#include <tommath.h>
+
+int main(void)
+{
+   mp_int modulus, R, p, pp;
+   mp_digit mp;
+   long x, y;
+
+   srand(time(NULL));
+   mp_init_multi(&modulus, &R, &p, &pp, NULL);
+
+   /* loop through various sizes */
+   for (x = 4; x < 256; x++) {
+       printf("DIGITS == %3ld...", x); fflush(stdout);
+       
+       /* make up the odd modulus */
+       mp_rand(&modulus, x);
+       modulus.dp[0] |= 1;
+       
+       /* now find the R value */
+       mp_montgomery_calc_normalization(&R, &modulus);
+       mp_montgomery_setup(&modulus, &mp);
+       
+       /* now run through a bunch tests */
+       for (y = 0; y < 1000; y++) {
+           mp_rand(&p, x/2);        /* p = random */
+           mp_mul(&p, &R, &pp);     /* pp = R * p */
+           mp_montgomery_reduce(&pp, &modulus, mp);
+           
+           /* should be equal to p */
+           if (mp_cmp(&pp, &p) != MP_EQ) {
+              printf("FAILURE!\n");
+              exit(-1);
+           }
+       }
+       printf("PASSED\n");
+    }
+    
+    return 0;
+}
+
+
+
+
+