com.qcloud.cos.internal.crypto.COSKeyWrapScheme Maven / Gradle / Ivy

/*
 * Copyright 2010-2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file 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.
 
 * According to cos feature, we modify some class，comment, field name, etc.
 */


package com.qcloud.cos.internal.crypto;

import java.security.Key;

class COSKeyWrapScheme {
    public static final String AESWrap = "AESWrap"; 
    public static final String RSA_ECB_OAEPWithSHA256AndMGF1Padding = "RSA/ECB/OAEPWithSHA-256AndMGF1Padding";

    /**
     * @param kek
     *            the key encrypting key, which is either an AES key or a public
     *            key
     */
    String getKeyWrapAlgorithm(Key kek) {
        String algorithm = kek.getAlgorithm();
        if (COSCryptoScheme.AES.equals(algorithm)) {
            return AESWrap;
        }
        if (COSCryptoScheme.RSA.equals(algorithm)) {
            if (CryptoRuntime.isRsaKeyWrapAvailable())
                return RSA_ECB_OAEPWithSHA256AndMGF1Padding;
        }
        throw new IllegalArgumentException("Unsupported key wrap algorithm " + algorithm);
    }

    @Override public String toString() { return "COSKeyWrapScheme"; }
}