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EncryptionHelper.java
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EncryptionHelper.java
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/**
* Copyright 2012 Microsoft Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License 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.
*/
package com.microsoft.windowsazure.services.media;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.security.Key;
import java.security.SecureRandom;
import java.security.cert.Certificate;
import java.security.cert.CertificateFactory;
import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import com.microsoft.windowsazure.services.core.storage.utils.Base64;
class EncryptionHelper {
public static byte[] encryptSymmetricKey(String protectionKey, byte[] inputData) throws Exception {
Cipher cipher = Cipher.getInstance("RSA/ECB/OAEPWithSHA-1AndMGF1Padding");
CertificateFactory certificateFactory = CertificateFactory.getInstance("X.509");
byte[] protectionKeyBytes = Base64.decode(protectionKey);
ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(protectionKeyBytes);
Certificate certificate = certificateFactory.generateCertificate(byteArrayInputStream);
Key publicKey = certificate.getPublicKey();
SecureRandom secureRandom = new SecureRandom();
cipher.init(Cipher.ENCRYPT_MODE, publicKey, secureRandom);
byte[] cipherText = cipher.doFinal(inputData);
return cipherText;
}
public static String calculateContentKeyChecksum(String uuid, byte[] aesKey) throws Exception {
Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
SecretKeySpec secretKeySpec = new SecretKeySpec(aesKey, "AES");
cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);
byte[] encryptionResult = cipher.doFinal(uuid.getBytes("UTF8"));
byte[] checksumByteArray = new byte[8];
System.arraycopy(encryptionResult, 0, checksumByteArray, 0, 8);
String checksum = Base64.encode(checksumByteArray);
return checksum;
}
public static InputStream encryptFile(InputStream inputStream, byte[] key, byte[] iv) throws Exception {
Cipher cipher = Cipher.getInstance("AES/CTR/NoPadding");
SecretKeySpec keySpec = new SecretKeySpec(key, "AES");
IvParameterSpec ivParameterSpec = new IvParameterSpec(iv);
cipher.init(Cipher.ENCRYPT_MODE, keySpec, ivParameterSpec);
CipherInputStream cipherInputStream = new CipherInputStream(inputStream, cipher);
return cipherInputStream;
}
}