/*
 * Copyright 2017, OnGres.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
 * following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following
 * disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
 * following disclaimer in the documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */


package com.ongres.scram.common.util;


/**
 * Utility static methods for cryptography related tasks.
 */
public class CryptoUtil {
    public static String nonce(int size) {
        return null;
    }
}

@@ -1356,16 +1356,53 @@
 util;%0A%0A%0A
+import java.security.SecureRandom;%0A%0A%0A
 /**%0A * U
@@ -1494,65 +1494,737 @@
    p
-ublic static String nonce(int size) %7B%0A        return null
+rivate static final int MIN_ASCII_PRINTABLE_RANGE = 0x21;%0A    private static final int MAX_ASCII_PRINTABLE_RANGE = 0x7e;%0A    private static final int EXCLUDED_CHAR = (int) ','; // 0x2c%0A%0A    public static String nonce(int size) %7B%0A        if(size %3C= 0) %7B%0A            throw new IllegalArgumentException(%22Size must be positive%22);%0A        %7D%0A%0A        SecureRandom random = new SecureRandom();%0A        char%5B%5D chars = new char%5Bsize%5D;%0A        int r;%0A        for(int i = 0; i %3C size;) %7B%0A            r = random.nextInt(MAX_ASCII_PRINTABLE_RANGE - MIN_ASCII_PRINTABLE_RANGE + 1) + MIN_ASCII_PRINTABLE_RANGE;%0A            if(r != EXCLUDED_CHAR) %7B%0A                chars%5Bi++%5D = (char) r;%0A            %7D%0A        %7D%0A%0A        return new String(chars)
 ;%0A  

Implement CryptoUtil.nonce(size). Tests pass.