xref: /external/bouncycastle/bcprov/src/main/java/org/bouncycastle/util/BigIntegers.java

package org.bouncycastle.util;

import java.math.BigInteger;

/**
 * BigInteger utilities.
 */
public final class BigIntegers
{
    /**
     * Return the passed in value as an unsigned byte array.
     *
     * @param value value to be converted.
     * @return a byte array without a leading zero byte if present in the signed encoding.
     */
    public static byte[] asUnsignedByteArray(
        BigInteger value)
    {
        byte[] bytes = value.toByteArray();

        if (bytes[0] == 0)
        {
            byte[] tmp = new byte[bytes.length - 1];

            System.arraycopy(bytes, 1, tmp, 0, tmp.length);

            return tmp;
        }

        return bytes;
    }
}