jackye1995 commented on a change in pull request #2638: URL: https://github.com/apache/iceberg/pull/2638#discussion_r826371400
########## File path: core/src/main/java/org/apache/iceberg/encryption/Ciphers.java ########## @@ -0,0 +1,130 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you 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 org.apache.iceberg.encryption; + +import java.security.GeneralSecurityException; +import java.security.SecureRandom; +import javax.crypto.AEADBadTagException; +import javax.crypto.Cipher; +import javax.crypto.spec.GCMParameterSpec; +import javax.crypto.spec.SecretKeySpec; + +public class Ciphers { + private static final int NONCE_LENGTH = 12; + private static final int GCM_TAG_LENGTH = 16; + private static final int GCM_TAG_LENGTH_BITS = 8 * GCM_TAG_LENGTH; + + public static class AesGcmEncryptor { + private final SecretKeySpec aesKey; + private final Cipher cipher; + private final SecureRandom randomGenerator; + + public AesGcmEncryptor(byte[] keyBytes) { + int keyLength = keyBytes.length; + if (!(keyLength == 16 || keyLength == 24 || keyLength == 32)) { + throw new IllegalArgumentException("Cannot use a key of length " + keyLength + + " because AES only allows 16, 24 or 32 bytes"); + } + this.aesKey = new SecretKeySpec(keyBytes, "AES"); + + try { + this.cipher = Cipher.getInstance("AES/GCM/NoPadding"); + } catch (GeneralSecurityException e) { + throw new RuntimeException("Failed to create GCM cipher", e); + } + + this.randomGenerator = new SecureRandom(); + } + + public byte[] encrypt(byte[] plainText, byte[] aad) { + byte[] nonce = new byte[NONCE_LENGTH]; + randomGenerator.nextBytes(nonce); + int cipherTextLength = NONCE_LENGTH + plainText.length + GCM_TAG_LENGTH; + byte[] cipherText = new byte[cipherTextLength]; + + try { + GCMParameterSpec spec = new GCMParameterSpec(GCM_TAG_LENGTH_BITS, nonce); + cipher.init(Cipher.ENCRYPT_MODE, aesKey, spec); + if (null != aad) { + cipher.updateAAD(aad); + } + cipher.doFinal(plainText, 0, plainText.length, cipherText, NONCE_LENGTH); + } catch (GeneralSecurityException e) { + throw new RuntimeException("Failed to encrypt", e); + } + + // Add the nonce + System.arraycopy(nonce, 0, cipherText, 0, NONCE_LENGTH); + + return cipherText; + } + } + + public static class AesGcmDecryptor { + private final SecretKeySpec aesKey; + private final Cipher cipher; + + public AesGcmDecryptor(byte[] keyBytes) { + int keyLength = keyBytes.length; + if (!(keyLength == 16 || keyLength == 24 || keyLength == 32)) { Review comment: can use `Preconditions.checkArgument` -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
