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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for Android.
Android ships with a stripped-down version of Bouncy Castle - this causes classloader collisions if you try to add
an alternative (updated/complete) Bouncy Castle jar.
This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5.
The newest version!
package org.spongycastle.cms.jcajce;
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;
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 org.spongycastle.asn1.ASN1Null;
import org.spongycastle.asn1.ASN1Object;
import org.spongycastle.asn1.ASN1ObjectIdentifier;
import org.spongycastle.asn1.ASN1OctetString;
import org.spongycastle.asn1.DEREncodable;
import org.spongycastle.asn1.DERNull;
import org.spongycastle.asn1.DERObjectIdentifier;
import org.spongycastle.asn1.DEROctetString;
import org.spongycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.spongycastle.asn1.pkcs.RC2CBCParameter;
import org.spongycastle.asn1.x509.AlgorithmIdentifier;
import org.spongycastle.cms.CMSAlgorithm;
import org.spongycastle.cms.CMSEnvelopedDataGenerator;
import org.spongycastle.cms.CMSException;
import org.spongycastle.jcajce.JcaJceHelper;
import org.spongycastle.operator.AsymmetricKeyUnwrapper;
import org.spongycastle.operator.SymmetricKeyUnwrapper;
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;
if (params != null)
{
try
{
asn1Params = ASN1Object.fromByteArray(params.getEncoded("ASN.1"));
}
catch (IOException e)
{
throw new CMSException("cannot encode parameters: " + e.getMessage(), e);
}
}
else
{
asn1Params = DERNull.INSTANCE;
}
return new AlgorithmIdentifier(
encryptionOID,
asn1Params);
}
static Object execute(JCECallback callback) throws CMSException
{
try
{
return callback.doInJCE();
}
catch (NoSuchAlgorithmException e)
{
throw new CMSException("can't find algorithm.", e);
}
catch (InvalidKeyException e)
{
throw new CMSException("key invalid in message.", e);
}
catch (NoSuchProviderException e)
{
throw new CMSException("can't find provider.", e);
}
catch (NoSuchPaddingException e)
{
throw new CMSException("required padding not supported.", e);
}
catch (InvalidAlgorithmParameterException e)
{
throw new CMSException("algorithm parameters invalid.", e);
}
catch (InvalidParameterSpecException e)
{
throw new CMSException("MAC algorithm parameter spec invalid.", e);
}
}
public KeyFactory createKeyFactory(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.createKeyFactory(cipherName);
}
catch (NoSuchAlgorithmException e)
{
// Ignore
}
}
return helper.createKeyFactory(algorithm.getId());
}
catch (GeneralSecurityException e)
{
throw new CMSException("cannot create key factory: " + e.getMessage(), e);
}
}
public AsymmetricKeyUnwrapper createAsymmetricUnwrapper(AlgorithmIdentifier keyEncryptionAlgorithm, PrivateKey keyEncryptionKey)
{
return helper.createAsymmetricUnwrapper(keyEncryptionAlgorithm, keyEncryptionKey);
}
public SymmetricKeyUnwrapper createSymmetricUnwrapper(AlgorithmIdentifier keyEncryptionAlgorithm, SecretKey keyEncryptionKey)
{
return helper.createSymmetricUnwrapper(keyEncryptionAlgorithm, keyEncryptionKey);
}
public AlgorithmIdentifier getAlgorithmIdentifier(ASN1ObjectIdentifier macOID, AlgorithmParameterSpec paramSpec)
{
if (paramSpec instanceof IvParameterSpec)
{
return new AlgorithmIdentifier(macOID, new DEROctetString(((IvParameterSpec)paramSpec).getIV()));
}
if (paramSpec instanceof RC2ParameterSpec)
{
RC2ParameterSpec rc2Spec = (RC2ParameterSpec)paramSpec;
int effKeyBits = ((RC2ParameterSpec)paramSpec).getEffectiveKeyBits();
if (effKeyBits != -1)
{
int parameterVersion;
if (effKeyBits < 256)
{
parameterVersion = rc2Table[effKeyBits];
}
else
{
parameterVersion = effKeyBits;
}
return new AlgorithmIdentifier(macOID, new RC2CBCParameter(parameterVersion, rc2Spec.getIV()));
}
return new AlgorithmIdentifier(macOID, new RC2CBCParameter(rc2Spec.getIV()));
}
throw new IllegalStateException("unknown parameter spec");
}
static interface JCECallback
{
Object doInJCE()
throws CMSException, InvalidAlgorithmParameterException, InvalidKeyException, InvalidParameterSpecException,
NoSuchAlgorithmException, NoSuchPaddingException, NoSuchProviderException;
}
}