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Microsoft JDBC Driver for SQL Server. The Azure Key Vault feature in Microsoft JDBC Driver for SQL Server depends on Azure SDK for JAVA and Azure Active Directory Library For Java.

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/*
 * Microsoft JDBC Driver for SQL Server
 * 
 * Copyright(c) Microsoft Corporation All rights reserved.
 * 
 * This program is made available under the terms of the MIT License. See the LICENSE file in the project root for more information.
 */

package com.microsoft.sqlserver.jdbc;

import java.text.MessageFormat;
import java.util.concurrent.ConcurrentHashMap;

/**
 * Maintain list of all the encryption algorithm factory classes
 */
final class SQLServerEncryptionAlgorithmFactoryList {

    private ConcurrentHashMap encryptionAlgoFactoryMap;

    private static final SQLServerEncryptionAlgorithmFactoryList instance = new SQLServerEncryptionAlgorithmFactoryList();

    private SQLServerEncryptionAlgorithmFactoryList() {
        encryptionAlgoFactoryMap = new ConcurrentHashMap();
        encryptionAlgoFactoryMap.putIfAbsent(SQLServerAeadAes256CbcHmac256Algorithm.algorithmName, new SQLServerAeadAes256CbcHmac256Factory());
    }

    static SQLServerEncryptionAlgorithmFactoryList getInstance() {
        return instance;
    }

    /**
     * @return list of registered algorithms separated by comma
     */
    String getRegisteredCipherAlgorithmNames() {
        StringBuffer stringBuff = new StringBuffer();
        boolean first = true;
        for (String key : encryptionAlgoFactoryMap.keySet()) {
            if (first) {
                stringBuff.append("'");
                first = false;
            }
            else {
                stringBuff.append(", '");
            }
            stringBuff.append(key);
            stringBuff.append("'");

        }
        return stringBuff.toString();
    }

    /**
     * Return instance for given algorithm
     * 
     * @param key
     * @param encryptionType
     * @param algorithmName
     * @return instance for given algorithm
     * @throws SQLServerException
     */
    SQLServerEncryptionAlgorithm getAlgorithm(SQLServerSymmetricKey key,
            SQLServerEncryptionType encryptionType,
            String algorithmName) throws SQLServerException {
        SQLServerEncryptionAlgorithm encryptionAlgorithm = null;
        SQLServerEncryptionAlgorithmFactory factory = null;
        if (!encryptionAlgoFactoryMap.containsKey(algorithmName)) {
            MessageFormat form = new MessageFormat(SQLServerException.getErrString("R_UnknownColumnEncryptionAlgorithm"));
            Object[] msgArgs = {algorithmName, SQLServerEncryptionAlgorithmFactoryList.getInstance().getRegisteredCipherAlgorithmNames()};
            throw new SQLServerException(this, form.format(msgArgs), null, 0, false);
        }

        factory = encryptionAlgoFactoryMap.get(algorithmName);
        assert null != factory : "Null Algorithm Factory class detected";
        encryptionAlgorithm = factory.create(key, encryptionType, algorithmName);
        return encryptionAlgorithm;
    }

}