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ddd-common

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//   Copyright 2012,2013 Vaughn Vernon
//
//   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.

package io.dddspring.common.tools;

import io.dddspring.common.AssertionConcern;

import java.math.BigInteger;
import java.security.MessageDigest;

public class MD5EncryptionService extends AssertionConcern implements EncryptionService {

    public MD5EncryptionService() {
        super();
    }

    @Override
    public String encryptedValue(String aPlainTextValue) {
        this.assertArgumentNotEmpty(
                aPlainTextValue,
                "Plain text value to encrypt must be provided.");

        String encryptedValue = null;

        try {

            MessageDigest messageDigest = MessageDigest.getInstance("MD5");

            messageDigest.update(aPlainTextValue.getBytes("UTF-8"));

            BigInteger bigInt = new BigInteger(1, messageDigest.digest());

            encryptedValue = bigInt.toString(16);

        } catch (Exception e) {
            throw new IllegalStateException(e);
        }

        return encryptedValue;
    }
}