org.bouncycastle.tls.crypto.impl.jcajce.JceBlockCipherImpl Maven / Gradle / Ivy
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Spoof TLS/JA3/JA4 and HTTP/2 fingerprints in Java
package org.bouncycastle.tls.crypto.impl.jcajce;
import java.security.GeneralSecurityException;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import org.bouncycastle.tls.crypto.impl.TlsBlockCipherImpl;
/**
* A basic wrapper for a JCE Cipher class to provide the needed block cipher functionality for TLS.
*/
public class JceBlockCipherImpl
implements TlsBlockCipherImpl
{
private static final int BUF_SIZE = 32 * 1024;
private final JcaTlsCrypto crypto;
private final Cipher cipher;
private final String algorithm;
private final int keySize;
private final int cipherMode;
private SecretKey key;
public JceBlockCipherImpl(JcaTlsCrypto crypto, Cipher cipher, String algorithm, int keySize, boolean isEncrypting)
throws GeneralSecurityException
{
this.crypto = crypto;
this.cipher = cipher;
this.algorithm = algorithm;
this.keySize = keySize;
this.cipherMode = isEncrypting ? Cipher.ENCRYPT_MODE : Cipher.DECRYPT_MODE;
}
public void setKey(byte[] key, int keyOff, int keyLen)
{
if (keySize != keyLen)
{
throw new IllegalStateException();
}
this.key = new SecretKeySpec(key, keyOff, keyLen, algorithm);
}
public void init(byte[] iv, int ivOff, int ivLen)
{
// NOTE: Shouldn't need a SecureRandom, but this is cheaper if the provider would auto-create one
SecureRandom random = crypto.getSecureRandom();
try
{
cipher.init(cipherMode, key, new IvParameterSpec(iv, ivOff, ivLen), random);
}
catch (GeneralSecurityException e)
{
throw Exceptions.illegalStateException(e.getMessage(), e);
}
}
public int doFinal(byte[] input, int inputOffset, int inputLength, byte[] output, int outputOffset)
{
try
{
// to avoid performance issue in FIPS jar 1.0.0-1.0.2
int totLen = 0;
while (inputLength > BUF_SIZE)
{
totLen += cipher.update(input, inputOffset, BUF_SIZE, output, outputOffset + totLen);
inputOffset += BUF_SIZE;
inputLength -= BUF_SIZE;
}
totLen += cipher.update(input, inputOffset, inputLength, output, outputOffset + totLen);
totLen += cipher.doFinal(output, outputOffset + totLen);
return totLen;
}
catch (GeneralSecurityException e)
{
throw Exceptions.illegalStateException(e.getMessage(), e);
}
}
public int getBlockSize()
{
return cipher.getBlockSize();
}
}