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Thread: BigNum Calc

  1. #1
    Programmer Run Amock... Bengaly's Avatar
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    BigNum Calc

    is there a calculator that can evolute an expression like:
    i.e: (rsa)
    (xxxxxxxxxx^xxxxxxxxx)mod xxxxxxxxx

    or any big number expressions?
    "knowledge is now free at last, everything should be free from now on, enjoy knowledge and life and never work for everybody else"

  2. #2
    Artifex
    Guest
    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
    I promise that I have read the FAQ and tried to use the Search to answer my question.

  3. #3
    Programmer Run Amock... Bengaly's Avatar
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    thnx artifex,

    iv wrote a quick RSA bignum calculator using miracl lib, no need to waste time on searching some other calculator.
    "knowledge is now free at last, everything should be free from now on, enjoy knowledge and life and never work for everybody else"

  4. #4
    Artifex
    Guest
    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
    I promise that I have read the FAQ and tried to use the Search to answer my question.

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