85 lines
2.6 KiB
Java
85 lines
2.6 KiB
Java
/**
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*
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* Copyright 2017 Paul Schaub
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smackx.omemo.internal;
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import org.jivesoftware.smackx.omemo.exceptions.CryptoFailedException;
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import javax.crypto.Cipher;
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import javax.crypto.NoSuchPaddingException;
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import javax.crypto.spec.IvParameterSpec;
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import javax.crypto.spec.SecretKeySpec;
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import java.security.InvalidAlgorithmParameterException;
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import java.security.NoSuchAlgorithmException;
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import java.security.NoSuchProviderException;
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import static org.jivesoftware.smackx.omemo.util.OmemoConstants.Crypto.CIPHERMODE;
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import static org.jivesoftware.smackx.omemo.util.OmemoConstants.Crypto.KEYTYPE;
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import static org.jivesoftware.smackx.omemo.util.OmemoConstants.Crypto.PROVIDER;
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/**
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* Encapsulate Cipher and AuthTag.
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*
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* @author Paul Schaub
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*/
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public class CipherAndAuthTag {
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private final byte[] key, iv, authTag;
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public CipherAndAuthTag(byte[] key, byte[] iv, byte[] authTag) throws CryptoFailedException {
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this.authTag = authTag;
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this.key = key;
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this.iv = iv;
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}
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public Cipher getCipher() throws CryptoFailedException {
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Cipher cipher;
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try {
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cipher = Cipher.getInstance(CIPHERMODE, PROVIDER);
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SecretKeySpec keySpec = new SecretKeySpec(key, KEYTYPE);
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IvParameterSpec ivSpec = new IvParameterSpec(iv);
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cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
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} catch (NoSuchAlgorithmException | java.security.InvalidKeyException |
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InvalidAlgorithmParameterException |
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NoSuchPaddingException | NoSuchProviderException e) {
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throw new CryptoFailedException(e);
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}
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return cipher;
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}
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public byte[] getAuthTag() {
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if (authTag != null) {
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return authTag.clone();
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}
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return null;
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}
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public byte[] getKey() {
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if (key != null) {
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return key.clone();
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}
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return null;
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}
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public byte[] getIv() {
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if (iv != null) {
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return iv.clone();
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}
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return null;
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}
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}
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