Java BigInteger to bigIntegerToBytes(BigInteger b, int numBytes)

Description

big Integer To Bytes

License

Apache License

Declaration

public static byte[] bigIntegerToBytes(BigInteger b, int numBytes) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.math.BigInteger;

public class Main {
    public static byte[] bigIntegerToBytes(BigInteger b, int numBytes) {
        if (b == null)
            return null;
        byte[] bytes = new byte[numBytes];
        byte[] biBytes = b.toByteArray();
        int start = (biBytes.length == numBytes + 1) ? 1 : 0;
        int length = Math.min(biBytes.length, numBytes);
        System.arraycopy(biBytes, start, bytes, numBytes - length, length);
        return bytes;
    }/*from  w  ww . j a v  a2  s . c o  m*/

    public static byte[] bigIntegerToBytes(BigInteger value) {
        if (value == null)
            return null;

        byte[] data = value.toByteArray();

        if (data.length != 1 && data[0] == 0) {
            byte[] tmp = new byte[data.length - 1];
            System.arraycopy(data, 1, tmp, 0, tmp.length);
            data = tmp;
        }
        return data;
    }
}

Related

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2. bigIntegerToBase64(BigInteger value)
3. bigIntegerToBitArray(BigInteger x, int length)
4. BigIntegerToByteArrayWithoutSign(BigInteger value)
5. bigIntegerToBytes(BigInteger b, int numBytes)
6. bigIntegerToBytes(BigInteger b, int numBytes)
7. bigIntegerToBytes(BigInteger b, int numBytes)
8. bigIntegerToBytes(BigInteger integer)