public static EncryptedPrivateKeyInfo createEncryptedPrivateKeyInfo(
String algorithm,
char[] passPhrase,
byte[] salt,
int iterationCount,
PrivateKeyInfo keyInfo)
{
if (!PBEUtil.isPBEAlgorithm(algorithm))
{
throw new Exception("attempt to use non-PBE algorithm with PBE EncryptedPrivateKeyInfo generation");
}
ASN1Encodable parameters = PBEUtil.generateAlgorithmParameters(algorithm, salt, iterationCount);
CipherParameters keyParameters = PBEUtil.generateCipherParameters(algorithm, passPhrase, parameters);
byte[] encoding = null;
Object engine = PBEUtil.createEngine(algorithm);
if (engine is BufferedBlockCipher)
{
BufferedBlockCipher cipher = (BufferedBlockCipher)engine;
cipher.init(true, keyParameters);
byte[] keyBytes = keyInfo.getEncoded();
int encLen = cipher.getOutputSize(keyBytes.Length);
encoding = new byte[encLen];
int off = cipher.processBytes(keyBytes, 0, keyBytes.Length, encoding, 0);
cipher.doFinal(encoding, off);
}
else if (engine is StreamCipher)
{
StreamCipher cipher = (StreamCipher)engine;
cipher.init(true, keyParameters);
byte[] keyBytes = keyInfo.getEncoded();
encoding = new byte[keyBytes.Length];
cipher.processBytes(keyBytes, 0, keyBytes.Length, encoding, 0);
}
return(new EncryptedPrivateKeyInfo(new AlgorithmIdentifier(PBEUtil.getObjectIdentifier(algorithm), parameters), encoding));
}
public static PrivateKeyInfo createPrivateKeyInfo(
char[] passPhrase,
EncryptedPrivateKeyInfo encInfo)
{
CipherParameters keyParameters = PBEUtil.generateCipherParameters(encInfo.getEncryptionAlgorithm().getObjectId(), passPhrase, encInfo.getEncryptionAlgorithm().getParameters());
Object engine = PBEUtil.createEngine(encInfo.getEncryptionAlgorithm().getObjectId());
byte[] encoding = null;
if (engine is BufferedBlockCipher)
{
BufferedBlockCipher cipher = (BufferedBlockCipher)engine;
cipher.init(false, keyParameters);
byte[] keyBytes = encInfo.getEncryptedData();
int encLen = cipher.getOutputSize(keyBytes.Length);
encoding = new byte[encLen];
int off = cipher.processBytes(keyBytes, 0, keyBytes.Length, encoding, 0);
cipher.doFinal(encoding, off);
}
else if (engine is StreamCipher)
{
StreamCipher cipher = (StreamCipher)engine;
cipher.init(false, keyParameters);
byte[] keyBytes = encInfo.getEncryptedData();
encoding = new byte[keyBytes.Length];
cipher.processBytes(keyBytes, 0, keyBytes.Length, encoding, 0);
}
ASN1InputStream aIn = new ASN1InputStream(new MemoryStream(encoding));
return(PrivateKeyInfo.getInstance(aIn.readObject()));
}
ASN1Sequence decryptData(
AlgorithmIdentifier algId,
byte[] data,
char[] password)
{
PKCS12PBEParams pbeParams = PKCS12PBEParams.getInstance(algId.getParameters());
CipherParameters keyParameters = PBEUtil.generateCipherParameters(algId.getObjectId(), password, pbeParams);
byte[] encoding = null;
Object engine = PBEUtil.createEngine(algId.getObjectId());
if (engine is BufferedBlockCipher)
{
BufferedBlockCipher cipher = (BufferedBlockCipher)engine;
cipher.init(false, keyParameters);
int encLen = cipher.getOutputSize(data.Length);
encoding = new byte[encLen];
int off = cipher.processBytes(data, 0, data.Length, encoding, 0);
cipher.doFinal(encoding, off);
}
else if (engine is StreamCipher)
{
StreamCipher cipher = (StreamCipher)engine;
cipher.init(false, keyParameters);
encoding = new byte[data.Length];
cipher.processBytes(data, 0, data.Length, encoding, 0);
}
ASN1InputStream bIn = new ASN1InputStream(new MemoryStream(encoding));
return((ASN1Sequence)bIn.readObject());
}