1 files changed, 163 insertions, 0 deletions
diff --git a/security-utils/src/main/java/org/openecomp/sdc/security/Passwords.java b/security-utils/src/main/java/org/openecomp/sdc/security/Passwords.java
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index 0000000000..ef424b95de
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+++ b/security-utils/src/main/java/org/openecomp/sdc/security/Passwords.java
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+/*-
+ * ============LICENSE_START=======================================================
+ * SDC
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.openecomp.sdc.security;
+
+import java.math.BigInteger;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.security.SecureRandom;
+import java.util.Arrays;
+import java.util.Random;
+
+public class Passwords {
+
+	private static final Random RANDOM = new SecureRandom();
+	private static final int SALT = 0;
+	private static final int HASH = 1;
+	private static final String HASH_ALGORITHM = "SHA-256";
+
+	/**
+	 * static utility class
+	 */
+	private Passwords() {
+	}
+
+	/**
+	 * the method calculates a hash with a generated salt for the given password
+	 * 
+	 * @param password
+	 * @return a "salt:hash" value
+	 */
+	public static String hashPassword(String password) {
+		byte[] salt = getNextSalt();
+		byte byteData[] = hash(salt, password.getBytes());
+		if (byteData != null) {
+			return toHex(salt) + ":" + toHex(byteData);
+		}
+		return null;
+
+	}
+
+	/**
+	 * the method checks if the given password matches the calculated hash
+	 * 
+	 * @param password
+	 * @param expectedHash
+	 * @return
+	 */
+	public static boolean isExpectedPassword(String password, String expectedHash) {
+		String[] params = expectedHash.split(":");
+		return isExpectedPassword(password, params[SALT], params[HASH]);
+	}
+
+	/**
+	 * the method checks if the given password matches the calculated hash
+	 * 
+	 * @param password
+	 * @param salt
+	 * @param hash
+	 *            the hash generated using the salt
+	 * @return true if the password matched the hash
+	 */
+	public static boolean isExpectedPassword(String password, String salt, String hash) {
+		byte[] saltBytes = fromHex(salt);
+		byte[] hashBytes = fromHex(hash);
+
+		byte byteData[] = hash(saltBytes, password.getBytes());
+		if (byteData != null) {
+			return Arrays.equals(byteData, hashBytes);
+		}
+		return false;
+	}
+
+	public static void main(String[] args) {
+		if (args.length > 1 || args.length > 0) {
+			System.out.println("[" + hashPassword(args[0]) + "]");
+		} else {
+			System.out.println("no passward passed.");
+		}
+
+	}
+
+	/**
+	 * Returns a random salt to be used to hash a password.
+	 * 
+	 * @return a 16 bytes random salt
+	 */
+	private static byte[] getNextSalt() {
+		byte[] salt = new byte[16];
+		RANDOM.nextBytes(salt);
+		return salt;
+	}
+
+	/**
+	 * hase's the salt and value using the chosen algorithm
+	 * 
+	 * @param salt
+	 * @param password
+	 * @return an array of bytes resulting from the hash
+	 */
+	private static byte[] hash(byte[] salt, byte[] password) {
+		MessageDigest md;
+		byte[] byteData = null;
+		try {
+			md = MessageDigest.getInstance(HASH_ALGORITHM);
+			md.update(salt);
+			md.update(password);
+			byteData = md.digest();
+		} catch (NoSuchAlgorithmException e) {
+			System.out.println("invalid algorithm name");
+		}
+		return byteData;
+	}
+
+	/**
+	 * Converts a string of hexadecimal characters into a byte array.
+	 *
+	 * @param hex
+	 *            the hex string
+	 * @return the hex string decoded into a byte array
+	 */
+	private static byte[] fromHex(String hex) {
+		byte[] binary = new byte[hex.length() / 2];
+		for (int i = 0; i < binary.length; i++) {
+			binary[i] = (byte) Integer.parseInt(hex.substring(2 * i, 2 * i + 2), 16);
+		}
+		return binary;
+	}
+
+	/**
+	 * Converts a byte array into a hexadecimal string.
+	 *
+	 * @param array
+	 *            the byte array to convert
+	 * @return a length*2 character string encoding the byte array
+	 */
+	private static String toHex(byte[] array) {
+		BigInteger bi = new BigInteger(1, array);
+		String hex = bi.toString(16);
+		int paddingLength = (array.length * 2) - hex.length();
+		if (paddingLength > 0)
+			return String.format("%0" + paddingLength + "d", 0) + hex;
+		else
+			return hex;
+	}
+}