| package org.bouncycastle.cms.bc; |
| |
| import java.io.OutputStream; |
| import java.security.SecureRandom; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import org.bouncycastle.asn1.ASN1ObjectIdentifier; |
| import org.bouncycastle.asn1.x509.AlgorithmIdentifier; |
| import org.bouncycastle.cms.CMSAlgorithm; |
| import org.bouncycastle.cms.CMSException; |
| import org.bouncycastle.crypto.BufferedBlockCipher; |
| import org.bouncycastle.crypto.CipherKeyGenerator; |
| import org.bouncycastle.crypto.StreamCipher; |
| import org.bouncycastle.crypto.io.CipherOutputStream; |
| import org.bouncycastle.crypto.params.KeyParameter; |
| import org.bouncycastle.operator.GenericKey; |
| import org.bouncycastle.operator.OutputEncryptor; |
| import org.bouncycastle.util.Integers; |
| |
| public class BcCMSContentEncryptorBuilder |
| { |
| private static Map keySizes = new HashMap(); |
| |
| static |
| { |
| keySizes.put(CMSAlgorithm.AES128_CBC, Integers.valueOf(128)); |
| keySizes.put(CMSAlgorithm.AES192_CBC, Integers.valueOf(192)); |
| keySizes.put(CMSAlgorithm.AES256_CBC, Integers.valueOf(256)); |
| |
| keySizes.put(CMSAlgorithm.CAMELLIA128_CBC, Integers.valueOf(128)); |
| keySizes.put(CMSAlgorithm.CAMELLIA192_CBC, Integers.valueOf(192)); |
| keySizes.put(CMSAlgorithm.CAMELLIA256_CBC, Integers.valueOf(256)); |
| } |
| |
| private static int getKeySize(ASN1ObjectIdentifier oid) |
| { |
| Integer size = (Integer)keySizes.get(oid); |
| |
| if (size != null) |
| { |
| return size.intValue(); |
| } |
| |
| return -1; |
| } |
| |
| private final ASN1ObjectIdentifier encryptionOID; |
| private final int keySize; |
| |
| private EnvelopedDataHelper helper = new EnvelopedDataHelper(); |
| private SecureRandom random; |
| |
| public BcCMSContentEncryptorBuilder(ASN1ObjectIdentifier encryptionOID) |
| { |
| this(encryptionOID, getKeySize(encryptionOID)); |
| } |
| |
| public BcCMSContentEncryptorBuilder(ASN1ObjectIdentifier encryptionOID, int keySize) |
| { |
| this.encryptionOID = encryptionOID; |
| this.keySize = keySize; |
| } |
| |
| public BcCMSContentEncryptorBuilder setSecureRandom(SecureRandom random) |
| { |
| this.random = random; |
| |
| return this; |
| } |
| |
| public OutputEncryptor build() |
| throws CMSException |
| { |
| return new CMSOutputEncryptor(encryptionOID, keySize, random); |
| } |
| |
| private class CMSOutputEncryptor |
| implements OutputEncryptor |
| { |
| private KeyParameter encKey; |
| private AlgorithmIdentifier algorithmIdentifier; |
| private Object cipher; |
| |
| CMSOutputEncryptor(ASN1ObjectIdentifier encryptionOID, int keySize, SecureRandom random) |
| throws CMSException |
| { |
| if (random == null) |
| { |
| random = new SecureRandom(); |
| } |
| |
| CipherKeyGenerator keyGen = helper.createKeyGenerator(encryptionOID, random); |
| |
| encKey = new KeyParameter(keyGen.generateKey()); |
| |
| algorithmIdentifier = helper.generateAlgorithmIdentifier(encryptionOID, encKey, random); |
| |
| cipher = helper.createContentCipher(true, encKey, algorithmIdentifier); |
| } |
| |
| public AlgorithmIdentifier getAlgorithmIdentifier() |
| { |
| return algorithmIdentifier; |
| } |
| |
| public OutputStream getOutputStream(OutputStream dOut) |
| { |
| if (cipher instanceof BufferedBlockCipher) |
| { |
| return new CipherOutputStream(dOut, (BufferedBlockCipher)cipher); |
| } |
| else |
| { |
| return new CipherOutputStream(dOut, (StreamCipher)cipher); |
| } |
| } |
| |
| public GenericKey getKey() |
| { |
| return new GenericKey(algorithmIdentifier, encKey.getKey()); |
| } |
| } |
| } |