create Nonce via SecureRandom - Java java.util

Java examples for java.util:Random String

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Description

create Nonce via SecureRandom

Demo Code


import java.security.MessageDigest;
import java.security.SecureRandom;

public class Main{
    public static void main(String[] argv) throws Exception{
        System.out.println(createNonce());
    }//www . j a  va 2 s.  c  o  m
    public static String createNonce() {
        String nonce = "";

        try {
            SecureRandom prng = SecureRandom.getInstance("SHA1PRNG");
            String randomNum = String.valueOf(prng.nextInt());

            MessageDigest sha = MessageDigest.getInstance("SHA-1");
            byte[] result = sha.digest(randomNum.getBytes());
            nonce = OauthUtil.hexEncode(result);
        } catch (Exception e) {
        }

        return nonce;
    }
    public static String hexEncode(byte[] aInput) {
        StringBuilder result = new StringBuilder();

        char[] digits = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
                'a', 'b', 'c', 'd', 'e', 'f' };

        for (int idx = 0; idx < aInput.length; ++idx) {
            byte b = aInput[idx];
            result.append(digits[(b & 0xf0) >> 4]);
            result.append(digits[b & 0x0f]);
        }

        return result.toString();
    }
}

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