gt: 		if(params != null)
context: package repack.org.bouncycastle.cms.jcajce;
  
  import repack.org.bouncycastle.asn1.ASN1Null;
  import repack.org.bouncycastle.asn1.ASN1Object;
  import repack.org.bouncycastle.asn1.ASN1ObjectIdentifier;
  import repack.org.bouncycastle.asn1.ASN1OctetString;
  import repack.org.bouncycastle.asn1.DEREncodable;
  import repack.org.bouncycastle.asn1.DERNull;
  import repack.org.bouncycastle.asn1.DERObjectIdentifier;
  import repack.org.bouncycastle.asn1.DEROctetString;
  import repack.org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
  import repack.org.bouncycastle.asn1.pkcs.RC2CBCParameter;
  import repack.org.bouncycastle.asn1.x509.AlgorithmIdentifier;
  import repack.org.bouncycastle.cms.CMSAlgorithm;
  import repack.org.bouncycastle.cms.CMSEnvelopedDataGenerator;
  import repack.org.bouncycastle.cms.CMSException;
  import repack.org.bouncycastle.jcajce.JcaJceHelper;
  import repack.org.bouncycastle.operator.AsymmetricKeyUnwrapper;
  import repack.org.bouncycastle.operator.SymmetricKeyUnwrapper;
  
  import javax.crypto.Cipher;
  import javax.crypto.KeyAgreement;
  import javax.crypto.KeyGenerator;
  import javax.crypto.Mac;
  import javax.crypto.NoSuchPaddingException;
  import javax.crypto.SecretKey;
  import javax.crypto.spec.IvParameterSpec;
  import javax.crypto.spec.RC2ParameterSpec;
  import java.io.IOException;
  import java.security.AlgorithmParameterGenerator;
  import java.security.AlgorithmParameters;
  import java.security.GeneralSecurityException;
  import java.security.InvalidAlgorithmParameterException;
  import java.security.InvalidKeyException;
  import java.security.Key;
  import java.security.KeyFactory;
  import java.security.KeyPairGenerator;
  import java.security.NoSuchAlgorithmException;
  import java.security.NoSuchProviderException;
  import java.security.PrivateKey;
  import java.security.SecureRandom;
  import java.security.spec.AlgorithmParameterSpec;
  import java.security.spec.InvalidParameterSpecException;
  import java.util.HashMap;
  import java.util.Map;
  
  class EnvelopedDataHelper
  {
  	protected static final Map BASE_CIPHER_NAMES = new HashMap();
  	protected static final Map CIPHER_ALG_NAMES = new HashMap();
  	protected static final Map MAC_ALG_NAMES = new HashMap();
  
  	static
  	{
  		BASE_CIPHER_NAMES.put(CMSAlgorithm.DES_EDE3_CBC, "DESEDE");
  		BASE_CIPHER_NAMES.put(CMSAlgorithm.AES128_CBC, "AES");
  		BASE_CIPHER_NAMES.put(CMSAlgorithm.AES192_CBC, "AES");
  		BASE_CIPHER_NAMES.put(CMSAlgorithm.AES256_CBC, "AES");
  
  		CIPHER_ALG_NAMES.put(CMSAlgorithm.DES_EDE3_CBC, "DESEDE/CBC/PKCS5Padding");
  		CIPHER_ALG_NAMES.put(CMSAlgorithm.AES128_CBC, "AES/CBC/PKCS5Padding");
  		CIPHER_ALG_NAMES.put(CMSAlgorithm.AES192_CBC, "AES/CBC/PKCS5Padding");
  		CIPHER_ALG_NAMES.put(CMSAlgorithm.AES256_CBC, "AES/CBC/PKCS5Padding");
  		CIPHER_ALG_NAMES.put(new ASN1ObjectIdentifier(PKCSObjectIdentifiers.rsaEncryption.getId()), "RSA/ECB/PKCS1Padding");
  		CIPHER_ALG_NAMES.put(CMSAlgorithm.CAST5_CBC, "CAST5/CBC/PKCS5Padding");
  		CIPHER_ALG_NAMES.put(CMSAlgorithm.CAMELLIA128_CBC, "Camellia/CBC/PKCS5Padding");
  		CIPHER_ALG_NAMES.put(CMSAlgorithm.CAMELLIA192_CBC, "Camellia/CBC/PKCS5Padding");
  		CIPHER_ALG_NAMES.put(CMSAlgorithm.CAMELLIA256_CBC, "Camellia/CBC/PKCS5Padding");
  		CIPHER_ALG_NAMES.put(CMSAlgorithm.SEED_CBC, "SEED/CBC/PKCS5Padding");
  
  		MAC_ALG_NAMES.put(CMSAlgorithm.DES_EDE3_CBC, "DESEDEMac");
  		MAC_ALG_NAMES.put(CMSAlgorithm.AES128_CBC, "AESMac");
  		MAC_ALG_NAMES.put(CMSAlgorithm.AES192_CBC, "AESMac");
  		MAC_ALG_NAMES.put(CMSAlgorithm.AES256_CBC, "AESMac");
  		MAC_ALG_NAMES.put(CMSAlgorithm.RC2_CBC, "RC2Mac");
  	}
  
  	private static final short[] rc2Table = {
  			0xbd, 0x56, 0xea, 0xf2, 0xa2, 0xf1, 0xac, 0x2a, 0xb0, 0x93, 0xd1, 0x9c, 0x1b, 0x33, 0xfd, 0xd0,
  			0x30, 0x04, 0xb6, 0xdc, 0x7d, 0xdf, 0x32, 0x4b, 0xf7, 0xcb, 0x45, 0x9b, 0x31, 0xbb, 0x21, 0x5a,
  			0x41, 0x9f, 0xe1, 0xd9, 0x4a, 0x4d, 0x9e, 0xda, 0xa0, 0x68, 0x2c, 0xc3, 0x27, 0x5f, 0x80, 0x36,
  			0x3e, 0xee, 0xfb, 0x95, 0x1a, 0xfe, 0xce, 0xa8, 0x34, 0xa9, 0x13, 0xf0, 0xa6, 0x3f, 0xd8, 0x0c,
  			0x78, 0x24, 0xaf, 0x23, 0x52, 0xc1, 0x67, 0x17, 0xf5, 0x66, 0x90, 0xe7, 0xe8, 0x07, 0xb8, 0x60,
  			0x48, 0xe6, 0x1e, 0x53, 0xf3, 0x92, 0xa4, 0x72, 0x8c, 0x08, 0x15, 0x6e, 0x86, 0x00, 0x84, 0xfa,
  			0xf4, 0x7f, 0x8a, 0x42, 0x19, 0xf6, 0xdb, 0xcd, 0x14, 0x8d, 0x50, 0x12, 0xba, 0x3c, 0x06, 0x4e,
  			0xec, 0xb3, 0x35, 0x11, 0xa1, 0x88, 0x8e, 0x2b, 0x94, 0x99, 0xb7, 0x71, 0x74, 0xd3, 0xe4, 0xbf,
  			0x3a, 0xde, 0x96, 0x0e, 0xbc, 0x0a, 0xed, 0x77, 0xfc, 0x37, 0x6b, 0x03, 0x79, 0x89, 0x62, 0xc6,
  			0xd7, 0xc0, 0xd2, 0x7c, 0x6a, 0x8b, 0x22, 0xa3, 0x5b, 0x05, 0x5d, 0x02, 0x75, 0xd5, 0x61, 0xe3,
  			0x18, 0x8f, 0x55, 0x51, 0xad, 0x1f, 0x0b, 0x5e, 0x85, 0xe5, 0xc2, 0x57, 0x63, 0xca, 0x3d, 0x6c,
  			0xb4, 0xc5, 0xcc, 0x70, 0xb2, 0x91, 0x59, 0x0d, 0x47, 0x20, 0xc8, 0x4f, 0x58, 0xe0, 0x01, 0xe2,
  			0x16, 0x38, 0xc4, 0x6f, 0x3b, 0x0f, 0x65, 0x46, 0xbe, 0x7e, 0x2d, 0x7b, 0x82, 0xf9, 0x40, 0xb5,
  			0x1d, 0x73, 0xf8, 0xeb, 0x26, 0xc7, 0x87, 0x97, 0x25, 0x54, 0xb1, 0x28, 0xaa, 0x98, 0x9d, 0xa5,
  			0x64, 0x6d, 0x7a, 0xd4, 0x10, 0x81, 0x44, 0xef, 0x49, 0xd6, 0xae, 0x2e, 0xdd, 0x76, 0x5c, 0x2f,
  			0xa7, 0x1c, 0xc9, 0x09, 0x69, 0x9a, 0x83, 0xcf, 0x29, 0x39, 0xb9, 0xe9, 0x4c, 0xff, 0x43, 0xab
  	};
  
  	private static final short[] rc2Ekb = {
  			0x5d, 0xbe, 0x9b, 0x8b, 0x11, 0x99, 0x6e, 0x4d, 0x59, 0xf3, 0x85, 0xa6, 0x3f, 0xb7, 0x83, 0xc5,
  			0xe4, 0x73, 0x6b, 0x3a, 0x68, 0x5a, 0xc0, 0x47, 0xa0, 0x64, 0x34, 0x0c, 0xf1, 0xd0, 0x52, 0xa5,
  			0xb9, 0x1e, 0x96, 0x43, 0x41, 0xd8, 0xd4, 0x2c, 0xdb, 0xf8, 0x07, 0x77, 0x2a, 0xca, 0xeb, 0xef,
  			0x10, 0x1c, 0x16, 0x0d, 0x38, 0x72, 0x2f, 0x89, 0xc1, 0xf9, 0x80, 0xc4, 0x6d, 0xae, 0x30, 0x3d,
  			0xce, 0x20, 0x63, 0xfe, 0xe6, 0x1a, 0xc7, 0xb8, 0x50, 0xe8, 0x24, 0x17, 0xfc, 0x25, 0x6f, 0xbb,
  			0x6a, 0xa3, 0x44, 0x53, 0xd9, 0xa2, 0x01, 0xab, 0xbc, 0xb6, 0x1f, 0x98, 0xee, 0x9a, 0xa7, 0x2d,
  			0x4f, 0x9e, 0x8e, 0xac, 0xe0, 0xc6, 0x49, 0x46, 0x29, 0xf4, 0x94, 0x8a, 0xaf, 0xe1, 0x5b, 0xc3,
  			0xb3, 0x7b, 0x57, 0xd1, 0x7c, 0x9c, 0xed, 0x87, 0x40, 0x8c, 0xe2, 0xcb, 0x93, 0x14, 0xc9, 0x61,
  			0x2e, 0xe5, 0xcc, 0xf6, 0x5e, 0xa8, 0x5c, 0xd6, 0x75, 0x8d, 0x62, 0x95, 0x58, 0x69, 0x76, 0xa1,
  			0x4a, 0xb5, 0x55, 0x09, 0x78, 0x33, 0x82, 0xd7, 0xdd, 0x79, 0xf5, 0x1b, 0x0b, 0xde, 0x26, 0x21,
  			0x28, 0x74, 0x04, 0x97, 0x56, 0xdf, 0x3c, 0xf0, 0x37, 0x39, 0xdc, 0xff, 0x06, 0xa4, 0xea, 0x42,
  			0x08, 0xda, 0xb4, 0x71, 0xb0, 0xcf, 0x12, 0x7a, 0x4e, 0xfa, 0x6c, 0x1d, 0x84, 0x00, 0xc8, 0x7f,
  			0x91, 0x45, 0xaa, 0x2b, 0xc2, 0xb1, 0x8f, 0xd5, 0xba, 0xf2, 0xad, 0x19, 0xb2, 0x67, 0x36, 0xf7,
  			0x0f, 0x0a, 0x92, 0x7d, 0xe3, 0x9d, 0xe9, 0x90, 0x3e, 0x23, 0x27, 0x66, 0x13, 0xec, 0x81, 0x15,
  			0xbd, 0x22, 0xbf, 0x9f, 0x7e, 0xa9, 0x51, 0x4b, 0x4c, 0xfb, 0x02, 0xd3, 0x70, 0x86, 0x31, 0xe7,
  			0x3b, 0x05, 0x03, 0x54, 0x60, 0x48, 0x65, 0x18, 0xd2, 0xcd, 0x5f, 0x32, 0x88, 0x0e, 0x35, 0xfd
  	};
  
  	private JcaJceHelper helper;
  
  	EnvelopedDataHelper(JcaJceHelper helper)
  	{
  		this.helper = helper;
  	}
  
  	String getBaseCipherName(ASN1ObjectIdentifier algorithm)
  	{
  		String name = (String) BASE_CIPHER_NAMES.get(algorithm);
  
  		if(name == null)
  		{
  			return algorithm.getId();
  		}
  
  		return name;
  	}
  
  	Cipher createCipher(ASN1ObjectIdentifier algorithm)
  			throws CMSException
  	{
  		try
  		{
  			String cipherName = (String) CIPHER_ALG_NAMES.get(algorithm);
  
  			if(cipherName != null)
  			{
  				try
  				{
  					// this is reversed as the Sun policy files now allow unlimited strength RSA
  					return helper.createCipher(cipherName);
  				}
  				catch(NoSuchAlgorithmException e)
  				{
  					// Ignore
  				}
  			}
  			return helper.createCipher(algorithm.getId());
  		}
  		catch(GeneralSecurityException e)
  		{
  			throw new CMSException("cannot create cipher: " + e.getMessage(), e);
  		}
  	}
  
  	Mac createMac(ASN1ObjectIdentifier algorithm)
  			throws CMSException
  	{
  		try
  		{
  			String macName = (String) MAC_ALG_NAMES.get(algorithm);
  
  			if(macName != null)
  			{
  				try
  				{
  					// this is reversed as the Sun policy files now allow unlimited strength RSA
  					return helper.createMac(macName);
  				}
  				catch(NoSuchAlgorithmException e)
  				{
  					// Ignore
  				}
  			}
  			return helper.createMac(algorithm.getId());
  		}
  		catch(GeneralSecurityException e)
  		{
  			throw new CMSException("cannot create mac: " + e.getMessage(), e);
  		}
  	}
  
  	Cipher createRFC3211Wrapper(ASN1ObjectIdentifier algorithm)
  			throws CMSException
  	{
  		String cipherName = (String) BASE_CIPHER_NAMES.get(algorithm);
  
  		if(cipherName == null)
  		{
  			throw new CMSException("no name for " + algorithm);
  		}
  
  		cipherName += "RFC3211Wrap";
  
  		try
  		{
  			return helper.createCipher(cipherName);
  		}
  		catch(GeneralSecurityException e)
  		{
  			throw new CMSException("cannot create cipher: " + e.getMessage(), e);
  		}
  	}
  
  	KeyAgreement createKeyAgreement(ASN1ObjectIdentifier algorithm)
  			throws CMSException
  	{
  		try
  		{
  			String agreementName = (String) BASE_CIPHER_NAMES.get(algorithm);
  
  			if(agreementName != null)
  			{
  				try
  				{
  					// this is reversed as the Sun policy files now allow unlimited strength RSA
  					return helper.createKeyAgreement(agreementName);
  				}
  				catch(NoSuchAlgorithmException e)
  				{
  					// Ignore
  				}
  			}
  			return helper.createKeyAgreement(algorithm.getId());
  		}
  		catch(GeneralSecurityException e)
  		{
  			throw new CMSException("cannot create key pair generator: " + e.getMessage(), e);
  		}
  	}
  
  	AlgorithmParameterGenerator createAlgorithmParameterGenerator(ASN1ObjectIdentifier algorithm)
  			throws GeneralSecurityException
  	{
  		String algorithmName = (String) BASE_CIPHER_NAMES.get(algorithm);
  
  		if(algorithmName != null)
  		{
  			try
  			{
  				// this is reversed as the Sun policy files now allow unlimited strength RSA
  				return helper.createAlgorithmParameterGenerator(algorithmName);
  			}
  			catch(NoSuchAlgorithmException e)
  			{
  				// Ignore
  			}
  		}
  		return helper.createAlgorithmParameterGenerator(algorithm.getId());
  	}
  
  	Cipher createContentCipher(final Key sKey, final AlgorithmIdentifier encryptionAlgID)
  			throws CMSException
  	{
  		return (Cipher) execute(new JCECallback()
  		{
  			public Object doInJCE()
  					throws CMSException, InvalidAlgorithmParameterException,
  					InvalidKeyException, InvalidParameterSpecException, NoSuchAlgorithmException,
  					NoSuchPaddingException, NoSuchProviderException
  			{
  				Cipher cipher = createCipher(encryptionAlgID.getAlgorithm());
  				ASN1Object sParams = (ASN1Object) encryptionAlgID.getParameters().getDERObject();
  				String encAlg = encryptionAlgID.getAlgorithm().getId();
  
  				if(sParams != null && !(sParams instanceof ASN1Null))
  				{
  					try
  					{
  						AlgorithmParameters params = createAlgorithmParameters(encryptionAlgID.getAlgorithm());
  
  						try
  						{
  							params.init(sParams.getEncoded(), "ASN.1");
  						}
  						catch(IOException e)
  						{
  							throw new CMSException("error decoding algorithm parameters.", e);
  						}
  
  						cipher.init(Cipher.DECRYPT_MODE, sKey, params);
  					}
  					catch(NoSuchAlgorithmException e)
  					{
  						if(encAlg.equals(CMSEnvelopedDataGenerator.DES_EDE3_CBC)
  								|| encAlg.equals(CMSEnvelopedDataGenerator.IDEA_CBC)
  								|| encAlg.equals(CMSEnvelopedDataGenerator.AES128_CBC)
  								|| encAlg.equals(CMSEnvelopedDataGenerator.AES192_CBC)
  								|| encAlg.equals(CMSEnvelopedDataGenerator.AES256_CBC))
  						{
  							cipher.init(Cipher.DECRYPT_MODE, sKey, new IvParameterSpec(
  									ASN1OctetString.getInstance(sParams).getOctets()));
  						}
  						else
  						{
  							throw e;
  						}
  					}
  				}
  				else
  				{
  					if(encAlg.equals(CMSEnvelopedDataGenerator.DES_EDE3_CBC)
  							|| encAlg.equals(CMSEnvelopedDataGenerator.IDEA_CBC)
  							|| encAlg.equals(CMSEnvelopedDataGenerator.CAST5_CBC))
  					{
  						cipher.init(Cipher.DECRYPT_MODE, sKey, new IvParameterSpec(new byte[8]));
  					}
  					else
  					{
  						cipher.init(Cipher.DECRYPT_MODE, sKey);
  					}
  				}
  
  				return cipher;
  			}
  		});
  	}
  
  	Mac createContentMac(final Key sKey, final AlgorithmIdentifier macAlgId)
  			throws CMSException
  	{
  		return (Mac) execute(new JCECallback()
  		{
  			public Object doInJCE()
  					throws CMSException, InvalidAlgorithmParameterException,
  					InvalidKeyException, InvalidParameterSpecException, NoSuchAlgorithmException,
  					NoSuchPaddingException, NoSuchProviderException
  			{
  				Mac mac = createMac(macAlgId.getAlgorithm());
  				ASN1Object sParams = (ASN1Object) macAlgId.getParameters().getDERObject();
  				String macAlg = macAlgId.getAlgorithm().getId();
  
  				if(sParams != null && !(sParams instanceof ASN1Null))
  				{
  					try
  					{
  						AlgorithmParameters params = createAlgorithmParameters(macAlgId.getAlgorithm());
  
  						try
  						{
  							params.init(sParams.getEncoded(), "ASN.1");
  						}
  						catch(IOException e)
  						{
  							throw new CMSException("error decoding algorithm parameters.", e);
  						}
  
  						mac.init(sKey, params.getParameterSpec(IvParameterSpec.class));
  					}
  					catch(NoSuchAlgorithmException e)
  					{
  						throw e;
  					}
  				}
  				else
  				{
  					mac.init(sKey);
  				}
  
  				return mac;
  			}
  		});
  	}
  
  	AlgorithmParameters createAlgorithmParameters(ASN1ObjectIdentifier algorithm)
  			throws NoSuchAlgorithmException, NoSuchProviderException
  	{
  		String algorithmName = (String) BASE_CIPHER_NAMES.get(algorithm);
  
  		if(algorithmName != null)
  		{
  			try
  			{
  				// this is reversed as the Sun policy files now allow unlimited strength RSA
  				return helper.createAlgorithmParameters(algorithmName);
  			}
  			catch(NoSuchAlgorithmException e)
  			{
  				// Ignore
  			}
  		}
  		return helper.createAlgorithmParameters(algorithm.getId());
  	}
  
  
  	KeyPairGenerator createKeyPairGenerator(DERObjectIdentifier algorithm)
  			throws CMSException
  	{
  		try
  		{
  			String cipherName = (String) BASE_CIPHER_NAMES.get(algorithm);
  
  			if(cipherName != null)
  			{
  				try
  				{
  					// this is reversed as the Sun policy files now allow unlimited strength RSA
  					return helper.createKeyPairGenerator(cipherName);
  				}
  				catch(NoSuchAlgorithmException e)
  				{
  					// Ignore
  				}
  			}
  			return helper.createKeyPairGenerator(algorithm.getId());
  		}
  		catch(GeneralSecurityException e)
  		{
  			throw new CMSException("cannot create key pair generator: " + e.getMessage(), e);
  		}
  	}
  
  	public KeyGenerator createKeyGenerator(ASN1ObjectIdentifier algorithm)
  			throws CMSException
  	{
  		try
  		{
  			String cipherName = (String) BASE_CIPHER_NAMES.get(algorithm);
  
  			if(cipherName != null)
  			{
  				try
  				{
  					// this is reversed as the Sun policy files now allow unlimited strength RSA
  					return helper.createKeyGenerator(cipherName);
  				}
  				catch(NoSuchAlgorithmException e)
  				{
  					// Ignore
  				}
  			}
  			return helper.createKeyGenerator(algorithm.getId());
  		}
  		catch(GeneralSecurityException e)
  		{
  			throw new CMSException("cannot create key generator: " + e.getMessage(), e);
  		}
  	}
  
  	AlgorithmParameters generateParameters(ASN1ObjectIdentifier encryptionOID, SecretKey encKey, SecureRandom rand)
  			throws CMSException
  	{
  		try
  		{
  			AlgorithmParameterGenerator pGen = createAlgorithmParameterGenerator(encryptionOID);
  
  			if(encryptionOID.equals(CMSEnvelopedDataGenerator.RC2_CBC))
  			{
  				byte[] iv = new byte[8];
  
  				rand.nextBytes(iv);
  
  				try
  				{
  					pGen.init(new RC2ParameterSpec(encKey.getEncoded().length * 8, iv), rand);
  				}
  				catch(InvalidAlgorithmParameterException e)
  				{
  					throw new CMSException("parameters generation error: " + e, e);
  				}
  			}
  
  			return pGen.generateParameters();
  		}
  		catch(NoSuchAlgorithmException e)
  		{
  			return null;
  		}
  		catch(GeneralSecurityException e)
  		{
  			throw new CMSException("exception creating algorithm parameter generator: " + e, e);
  		}
  	}
  
  	AlgorithmIdentifier getAlgorithmIdentifier(ASN1ObjectIdentifier encryptionOID, AlgorithmParameters params)
  			throws CMSException
  	{
  		DEREncodable asn1Params;
  