67 lines
1.1 KiB
C
67 lines
1.1 KiB
C
/*
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* Copyright (c) 1980 Regents of the University of California.
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* All rights reserved. The Berkeley software License Agreement
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* specifies the terms and conditions for redistribution.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)pow.c 1.1 94/10/31 SMI"; /* from UCB 5.1 4/30/85 */
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#endif
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/* LINTLIBRARY */
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#include <mp.h>
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pow(a, b, c, d)
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MINT *a, *b, *c, *d;
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{
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int i, j, n;
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MINT x, y;
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MINT a0, b0, c0;
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a0.len = b0.len = c0.len = x.len = y.len = 0;
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_mp_move(a, &a0);
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_mp_move(b, &b0);
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_mp_move(c, &c0);
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xfree(d);
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d->len = 1;
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d->val = xalloc (1, "pow");
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*d->val = 1;
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for (j = 0; j < b0.len; j++) {
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n = b0.val[b0.len - j - 1];
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for (i = 0; i < 15; i++) {
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mult(d, d, &x);
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mdiv(&x, &c0, &y, d);
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if ((n = n << 1) & 0100000) {
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mult(&a0, d, &x);
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mdiv(&x, &c0, &y, d);
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}
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}
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}
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xfree(&x);
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xfree(&y);
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xfree(&a0);
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xfree(&b0);
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xfree(&c0);
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}
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rpow (a, n, b)
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MINT *a, *b;
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{
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MINT x, y;
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int i;
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x.len = 1;
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x.val = xalloc(1, "rpow");
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*x.val = n;
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y.len = n * a->len + 4;
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y.val = xalloc(y.len, "rpow2");
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for (i = 0; i < y.len; i++)
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y.val[i] = 0;
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y.val[y.len - 1] = 010000;
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pow(a, &x, &y, b);
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xfree(&x);
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xfree(&y);
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}
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