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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;

/**
 * 
 * Base class which represents Symmetric key
 *
 */
class SQLServerSymmetricKey {
    private byte[] rootKey;

    SQLServerSymmetricKey(byte[] rootKey) throws SQLServerException {
        if (null == rootKey) {
            throw new SQLServerException(this, SQLServerException.getErrString("R_NullColumnEncryptionKey"), null, 0, false);
        }
        else if (0 == rootKey.length) {
            throw new SQLServerException(this, SQLServerException.getErrString("R_EmptyColumnEncryptionKey"), null, 0, false);
        }
        this.rootKey = rootKey;
    }

    byte[] getRootKey() {
        return rootKey;
    }

    int length() {
        return rootKey.length;
    }

    void zeroOutKey() {
        for (int i = 0; i < rootKey.length; i++) {
            rootKey[i] = (byte) 0;
        }
    }
}