https://github.com/Microsoft/mssql-jdbc: Microsoft JDBC Driver for SQL Server. (Microsoft Corporation) 
/*
 * 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

Params:
  • plainText – 
       data to be encrypted
Returns:cipher text after encryption
/**
     * 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

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