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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;

/*
 * Abstract base class for all AE encryption algorithms. It exposes two functions 1. encryptData - This function is used by the driver under the
 * covers to transparently encrypt AE enabled column data. 2. decryptData - This function is used by the driver under the covers to transparently
 * decrypt AE enabled column data.
 */
abstract class SQLServerEncryptionAlgorithm {

    /**
     * Perform encryption of the plain text
     * 
     * @param plainText
     *            data to be encrypted
     * @return cipher text after encryption
     */
    abstract byte[] encryptData(byte[] plainText) throws SQLServerException;

    /**
     * Decrypt cipher text to plain text
     * 
     * @param cipherText
     *            data to be decrypted
     * @return plain text after decryption
     */
    abstract byte[] decryptData(byte[] cipherText) throws SQLServerException;
}