View Full Version : BigNum Calc

Bengaly

October 10th, 2002, 07:57

is there a calculator that can evolute an expression like:

i.e: (rsa)

(xxxxxxxxxx^xxxxxxxxx)mod xxxxxxxxx

or any big number expressions?

Artifex

October 10th, 2002, 09:17

Hi, Bengaly.

You want to compute c = x ^ y mod z.

With Jason Tiscione's Big Calculator you can compute a = x ^ y,

then b = a / z, then c = a - (b * z).

address :

h**p://www.geocities.com/SiliconValley/2548/

other solutions :

1. write a few lines of Java.

2. or C using Miracl library

3. or UBASIC 8.8e - A free Basic interpreter with fast multiprecision arithmetic

4. or Maple (demo version)

Artifex

Bengaly

October 11th, 2002, 17:11

thnx artifex,

iv wrote a quick RSA bignum calculator using miracl lib, no need to waste time on searching some other calculator.

Artifex

October 11th, 2002, 19:27

Hi, Bengaly. The C prog with the Miracl library is a good option.

You have also a Modpow(a,b,n) function in UBasic.

Here is a link :

h**p://jacobi.math.wvu.edu/~mays/545/UB/UBASIC.htm

h**p://jacobi.math.wvu.edu/~mays/545/UB/ub32i88f.zip

It is worthwhile to test it.

Artifex

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