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package org.bouncycastle.pkcs.bc;
import java.io.OutputStream;
import java.security.SecureRandom;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.pkcs.PKCS12PBEParams;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.crypto.BlockCipher;
import org.bouncycastle.crypto.BufferedBlockCipher;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.ExtendedDigest;
import org.bouncycastle.crypto.digests.SHA1Digest;
import org.bouncycastle.crypto.generators.PKCS12ParametersGenerator;
import org.bouncycastle.crypto.io.CipherOutputStream;
import org.bouncycastle.crypto.paddings.PKCS7Padding;
import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher;
import org.bouncycastle.operator.GenericKey;
import org.bouncycastle.operator.OutputEncryptor;
public class BcPKCS12PBEOutputEncryptorBuilder
{
private ExtendedDigest digest;
private BufferedBlockCipher engine;
private ASN1ObjectIdentifier algorithm;
private SecureRandom random;
private int iterationCount = 1024;
public BcPKCS12PBEOutputEncryptorBuilder(ASN1ObjectIdentifier algorithm, BlockCipher engine)
{
this(algorithm, engine, new SHA1Digest());
}
public BcPKCS12PBEOutputEncryptorBuilder(ASN1ObjectIdentifier algorithm, BlockCipher engine, ExtendedDigest pbeDigest)
{
this.algorithm = algorithm;
this.engine = new PaddedBufferedBlockCipher(engine, new PKCS7Padding());
this.digest = pbeDigest;
}
public BcPKCS12PBEOutputEncryptorBuilder setIterationCount(int iterationCount)
{
this.iterationCount = iterationCount;
return this;
}
public OutputEncryptor build(final char[] password)
{
if (random == null)
{
random = new SecureRandom();
}
final byte[] salt = new byte[20];
random.nextBytes(salt);
final PKCS12PBEParams pbeParams = new PKCS12PBEParams(salt, iterationCount);
CipherParameters params = PKCS12PBEUtils.createCipherParameters(algorithm, digest, engine.getBlockSize(), pbeParams, password);
engine.init(true, params);
return new OutputEncryptor()
{
public AlgorithmIdentifier getAlgorithmIdentifier()
{
return new AlgorithmIdentifier(algorithm, pbeParams);
}
public OutputStream getOutputStream(OutputStream out)
{
return new CipherOutputStream(out, engine);
}
public GenericKey getKey()
{
return new GenericKey(new AlgorithmIdentifier(algorithm, pbeParams), PKCS12ParametersGenerator.PKCS12PasswordToBytes(password));
}
};
}
}
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