mirror of
https://codeberg.org/Mercury-IM/Smack
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14142a0ef2
OmemoAesCipher is the sole point where OMEMO related AES operations are performed. This allows OmemoAesCipher to check in a static block if AES is available. If AES is not available it throws a (hopefully) helpfull exception message. Typically AES is not available on Android if no security provider providing AES, like Bouncy Castle, has been explicitly configured.
75 lines
2.2 KiB
Java
75 lines
2.2 KiB
Java
/**
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*
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* Copyright 2017 Paul Schaub, 2019-2021 Florian Schmaus
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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 java.nio.charset.StandardCharsets;
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import java.security.InvalidAlgorithmParameterException;
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import java.security.InvalidKeyException;
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import java.security.NoSuchAlgorithmException;
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import javax.crypto.BadPaddingException;
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import javax.crypto.IllegalBlockSizeException;
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import javax.crypto.NoSuchPaddingException;
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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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private final boolean wasPreKey;
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public CipherAndAuthTag(byte[] key, byte[] iv, byte[] authTag, boolean wasPreKey) {
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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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this.wasPreKey = wasPreKey;
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}
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public String decrypt(byte[] ciphertext) throws InvalidKeyException, IllegalBlockSizeException, BadPaddingException,
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NoSuchAlgorithmException, NoSuchPaddingException, InvalidAlgorithmParameterException {
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byte[] plaintext = OmemoAesCipher.decryptAesGcmNoPadding(ciphertext, key, iv);
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return new String(plaintext, StandardCharsets.UTF_8);
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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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public boolean wasPreKeyEncrypted() {
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return wasPreKey;
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}
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}
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