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());
}
