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051b1e55 DF |
1 | /* |
2 | * Copyright (c) 1980 Regents of the University of California. | |
3 | * All rights reserved. The Berkeley software License Agreement | |
4 | * specifies the terms and conditions for redistribution. | |
5 | */ | |
6 | ||
7 | #ifndef lint | |
8 | static char sccsid[] = "@(#)pow.c 5.1 (Berkeley) %G%"; | |
9 | #endif not lint | |
3be90705 SL |
10 | |
11 | #include <mp.h> | |
12 | pow(a,b,c,d) MINT *a,*b,*c,*d; | |
13 | { int i,j,n; | |
14 | MINT x,y; | |
15 | x.len=y.len=0; | |
16 | xfree(d); | |
17 | d->len=1; | |
18 | d->val=xalloc(1,"pow"); | |
19 | *d->val=1; | |
20 | for(j=0;j<b->len;j++) | |
21 | { n=b->val[b->len-j-1]; | |
22 | for(i=0;i<15;i++) | |
23 | { mult(d,d,&x); | |
24 | mdiv(&x,c,&y,d); | |
25 | if((n=n<<1)&0100000) | |
26 | { mult(a,d,&x); | |
27 | mdiv(&x,c,&y,d); | |
28 | } | |
29 | } | |
30 | } | |
31 | xfree(&x); | |
32 | xfree(&y); | |
33 | return; | |
34 | } | |
35 | rpow(a,n,b) MINT *a,*b; | |
36 | { MINT x,y; | |
37 | int i; | |
38 | x.len=1; | |
39 | x.val=xalloc(1,"rpow"); | |
40 | *x.val=n; | |
41 | y.len=n*a->len+4; | |
42 | y.val=xalloc(y.len,"rpow2"); | |
43 | for(i=0;i<y.len;i++) y.val[i]=0; | |
44 | y.val[y.len-1]=010000; | |
45 | xfree(b); | |
46 | pow(a,&x,&y,b); | |
47 | xfree(&x); | |
48 | xfree(&y); | |
49 | return; | |
50 | } |