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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.security;
import org.bouncycastle.crypto.BlockCipher;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.DataLengthException;
import org.bouncycastle.crypto.InvalidCipherTextException;
import org.bouncycastle.crypto.modes.AEADBlockCipher;
import org.bouncycastle.crypto.modes.ChaCha20Poly1305;
/**
* Minimal adapter to make ChaCha20Poly1305 usable as an AEADBlockCipher (it's technically
* an AEAD stream cipher, but this is not exposed in the BouncyCastle type system).
*
* @author vekterli
*/
class ChaCha20Poly1305AeadBlockCipherAdapter implements AEADBlockCipher {
private final ChaCha20Poly1305 cipher;
ChaCha20Poly1305AeadBlockCipherAdapter(ChaCha20Poly1305 cipher) {
this.cipher = cipher;
}
@Override
public BlockCipher getUnderlyingCipher() {
return null;
}
@Override
public void init(boolean forEncryption, CipherParameters params) throws IllegalArgumentException {
cipher.init(forEncryption, params);
}
@Override
public String getAlgorithmName() {
return cipher.getAlgorithmName();
}
@Override
public void processAADByte(byte in) {
cipher.processAADByte(in);
}
@Override
public void processAADBytes(byte[] in, int inOff, int len) {
cipher.processAADBytes(in, inOff, len);
}
@Override
public int processByte(byte in, byte[] out, int outOff) throws DataLengthException {
return cipher.processByte(in, out, outOff);
}
@Override
public int processBytes(byte[] in, int inOff, int len, byte[] out, int outOff) throws DataLengthException {
return cipher.processBytes(in, inOff, len, out, outOff);
}
@Override
public int doFinal(byte[] out, int outOff) throws IllegalStateException, InvalidCipherTextException {
return cipher.doFinal(out, outOff);
}
@Override
public byte[] getMac() {
return cipher.getMac();
}
@Override
public int getUpdateOutputSize(int len) {
return cipher.getUpdateOutputSize(len);
}
@Override
public int getOutputSize(int len) {
return cipher.getOutputSize(len);
}
@Override
public void reset() {
cipher.reset();
}
}
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