Java BigInteger Calculate randomFromZn(BigInteger n, Random rand)

Description

random From Zn

License

Apache License

Declaration

public static BigInteger randomFromZn(BigInteger n, Random rand) 

Method Source Code

//package com.java2s;
/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License./*from  ww  w  . j  ava  2 s . co  m*/
 */

import java.math.BigInteger;

import java.util.Random;

public class Main {
    public static BigInteger randomFromZn(BigInteger n, Random rand) {
        BigInteger result;
        do {
            result = new BigInteger(n.bitLength(), rand);
            // check that it's in Zn
        } while (result.compareTo(n) != -1);
        return result;
    }
}

Related

1. order(BigInteger a, BigInteger p, BigInteger f[], BigInteger e[])
2. parseBigInteger(String s, BigInteger defaultValue)
3. parseBinaryBigInteger(final byte[] buffer, final int offset, final int length, final boolean negative)
4. parseScaledNonNegativeBigInteger(String str)
5. product(final BigInteger min, final BigInteger max)
6. removeDuplicates(final BigInteger... values)
7. renderBigInteger(final BigInteger bint)
8. retrieveBigInteger(final byte[] buf, final int offset)
9. rightshift(byte b1, BigInteger b2)