com.qcloud.cos.internal.crypto.COSCryptoScheme Maven / Gradle / Ivy
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A single bundled dependency that includes all service and dependent JARs with third-party libraries
relocated to different namespaces.
/*
* 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.SecureRandom;
/**
* COS cryptographic scheme that includes the content crypto scheme and key
* wrapping scheme (for the content-encrypting-key).
*/
final class COSCryptoScheme {
static final String AES = "AES";
static final String RSA = "RSA";
private static final SecureRandom srand = new SecureRandom();
private final COSKeyWrapScheme kwScheme;
private final ContentCryptoScheme contentCryptoScheme;
private COSCryptoScheme(ContentCryptoScheme contentCryptoScheme,
COSKeyWrapScheme kwScheme) {
this.contentCryptoScheme = contentCryptoScheme;
this.kwScheme = kwScheme;
}
SecureRandom getSecureRandom() { return srand; }
ContentCryptoScheme getContentCryptoScheme() {
return contentCryptoScheme;
}
COSKeyWrapScheme getKeyWrapScheme() { return kwScheme; }
/**
* Convenient method.
*/
static boolean isAesGcm(String cipherAlgorithm) {
return ContentCryptoScheme.AES_GCM.getCipherAlgorithm().equals(cipherAlgorithm);
}
static COSCryptoScheme from(CryptoMode mode) {
switch (mode) {
case AesCbcEncryption:
return new COSCryptoScheme(ContentCryptoScheme.AES_CBC,
new COSKeyWrapScheme());
case AesCtrEncryption:
return new COSCryptoScheme(ContentCryptoScheme.AES_CTR,
new COSKeyWrapScheme());
case AuthenticatedEncryption:
case StrictAuthenticatedEncryption:
return new COSCryptoScheme(ContentCryptoScheme.AES_GCM,
new COSKeyWrapScheme());
default:
throw new IllegalStateException();
}
}
}
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