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package org.spongycastle.pkcs.jcajce;
import java.io.InputStream;
import java.security.Provider;
import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;
import org.spongycastle.asn1.ASN1Encodable;
import org.spongycastle.asn1.ASN1ObjectIdentifier;
import org.spongycastle.asn1.ASN1OctetString;
import org.spongycastle.asn1.cryptopro.GOST28147Parameters;
import org.spongycastle.asn1.pkcs.PBES2Parameters;
import org.spongycastle.asn1.pkcs.PBKDF2Params;
import org.spongycastle.asn1.pkcs.PKCS12PBEParams;
import org.spongycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.spongycastle.asn1.x509.AlgorithmIdentifier;
import org.spongycastle.jcajce.provider.symmetric.util.BCPBEKey;
import org.spongycastle.jcajce.spec.GOST28147ParameterSpec;
import org.spongycastle.jcajce.spec.PBKDF2KeySpec;
import org.spongycastle.jcajce.util.DefaultJcaJceHelper;
import org.spongycastle.jcajce.util.JcaJceHelper;
import org.spongycastle.jcajce.util.NamedJcaJceHelper;
import org.spongycastle.jcajce.util.ProviderJcaJceHelper;
import org.spongycastle.operator.DefaultSecretKeySizeProvider;
import org.spongycastle.operator.InputDecryptor;
import org.spongycastle.operator.InputDecryptorProvider;
import org.spongycastle.operator.OperatorCreationException;
import org.spongycastle.operator.SecretKeySizeProvider;
public class JcePKCSPBEInputDecryptorProviderBuilder
{
private JcaJceHelper helper = new DefaultJcaJceHelper();
private boolean wrongPKCS12Zero = false;
private SecretKeySizeProvider keySizeProvider = DefaultSecretKeySizeProvider.INSTANCE;
public JcePKCSPBEInputDecryptorProviderBuilder()
{
}
public JcePKCSPBEInputDecryptorProviderBuilder setProvider(Provider provider)
{
this.helper = new ProviderJcaJceHelper(provider);
return this;
}
public JcePKCSPBEInputDecryptorProviderBuilder setProvider(String providerName)
{
this.helper = new NamedJcaJceHelper(providerName);
return this;
}
public JcePKCSPBEInputDecryptorProviderBuilder setTryWrongPKCS12Zero(boolean tryWrong)
{
this.wrongPKCS12Zero = tryWrong;
return this;
}
/**
* Set the lookup provider of AlgorithmIdentifier returning key_size_in_bits used to
* handle PKCS5 decryption.
*
* @param keySizeProvider a provider of integer secret key sizes.
*
* @return the current builder.
*/
public JcePKCSPBEInputDecryptorProviderBuilder setKeySizeProvider(SecretKeySizeProvider keySizeProvider)
{
this.keySizeProvider = keySizeProvider;
return this;
}
public InputDecryptorProvider build(final char[] password)
{
return new InputDecryptorProvider()
{
private Cipher cipher;
private SecretKey key;
private AlgorithmIdentifier encryptionAlg;
public InputDecryptor get(final AlgorithmIdentifier algorithmIdentifier)
throws OperatorCreationException
{
ASN1ObjectIdentifier algorithm = algorithmIdentifier.getAlgorithm();
try
{
if (algorithm.on(PKCSObjectIdentifiers.pkcs_12PbeIds))
{
PKCS12PBEParams pbeParams = PKCS12PBEParams.getInstance(algorithmIdentifier.getParameters());
PBEKeySpec pbeSpec = new PBEKeySpec(password);
SecretKeyFactory keyFact = helper.createSecretKeyFactory(algorithm.getId());
PBEParameterSpec defParams = new PBEParameterSpec(
pbeParams.getIV(),
pbeParams.getIterations().intValue());
key = keyFact.generateSecret(pbeSpec);
if (key instanceof BCPBEKey)
{
((BCPBEKey)key).setTryWrongPKCS12Zero(wrongPKCS12Zero);
}
cipher = helper.createCipher(algorithm.getId());
cipher.init(Cipher.DECRYPT_MODE, key, defParams);
encryptionAlg = algorithmIdentifier;
}
else if (algorithm.equals(PKCSObjectIdentifiers.id_PBES2))
{
PBES2Parameters alg = PBES2Parameters.getInstance(algorithmIdentifier.getParameters());
PBKDF2Params func = PBKDF2Params.getInstance(alg.getKeyDerivationFunc().getParameters());
AlgorithmIdentifier encScheme = AlgorithmIdentifier.getInstance(alg.getEncryptionScheme());
SecretKeyFactory keyFact = helper.createSecretKeyFactory(alg.getKeyDerivationFunc().getAlgorithm().getId());
if (func.isDefaultPrf())
{
key = keyFact.generateSecret(new PBEKeySpec(password, func.getSalt(), func.getIterationCount().intValue(), keySizeProvider.getKeySize(encScheme)));
}
else
{
key = keyFact.generateSecret(new PBKDF2KeySpec(password, func.getSalt(), func.getIterationCount().intValue(), keySizeProvider.getKeySize(encScheme), func.getPrf()));
}
cipher = helper.createCipher(alg.getEncryptionScheme().getAlgorithm().getId());
encryptionAlg = AlgorithmIdentifier.getInstance(alg.getEncryptionScheme());
ASN1Encodable encParams = alg.getEncryptionScheme().getParameters();
if (encParams instanceof ASN1OctetString)
{
cipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(ASN1OctetString.getInstance(encParams).getOctets()));
}
else
{
// TODO: at the moment it's just GOST, but...
GOST28147Parameters gParams = GOST28147Parameters.getInstance(encParams);
cipher.init(Cipher.DECRYPT_MODE, key, new GOST28147ParameterSpec(gParams.getEncryptionParamSet(), gParams.getIV()));
}
}
}
catch (Exception e)
{
throw new OperatorCreationException("unable to create InputDecryptor: " + e.getMessage(), e);
}
return new InputDecryptor()
{
public AlgorithmIdentifier getAlgorithmIdentifier()
{
return encryptionAlg;
}
public InputStream getInputStream(InputStream input)
{
return new CipherInputStream(input, cipher);
}
};
}
};
}
}
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