/**
* generate a signature for the message we've been loaded with using
* the key we were initialised with.
*/
public byte[] generateSignature()
{
if (forSigning)
{
MemoryStream bOut = new MemoryStream();
DEROutputStream dOut = new DEROutputStream(bOut);
ASN1EncodableVector v = new ASN1EncodableVector();
byte[] dig = new byte[digest.getDigestSize()];
digest.doFinal(dig, 0);
BigInteger[] sig = dsaSigner.generateSignature(dig);
v.add(new DERInteger(sig[0]));
v.add(new DERInteger(sig[1]));
dOut.writeObject(new DERSequence(v));
dOut.Flush();
byte[] output = bOut.ToArray();
dOut.Close();
return(output);
}
throw new Exception("DSADigestSigner initialised for verification..");
}
/// <summary>
/// Get the DER Encoded PKCS10 Certification Request.
/// </summary>
/// <returns>A byte array.</returns>
public byte[] getEncoded()
{
MemoryStream mStr = new MemoryStream();
DEROutputStream derOut = new DEROutputStream(mStr);
derOut.writeObject(new CertificationRequest(reqInfo, sigAlgId, sigBits));
derOut.Flush();
byte[] _out = mStr.ToArray();
mStr.Close();
return(_out);
}
private byte[] derEncode(
byte[] hash)
{
MemoryStream bOut = new MemoryStream();
DEROutputStream dOut = new DEROutputStream(bOut);
DigestInfo dInfo = new DigestInfo(algId, hash);
dOut.writeObject(dInfo);
dOut.Flush();
return(bOut.ToArray());
}
/// <summary>
/// Verify PKCS10 Cert Reqest is valid.
/// </summary>
/// <returns>true = valid.</returns>
public bool verify()
{
Signer sig = null;
sig = SignerUtil.getSigner(sigAlgId.getObjectId());
sig.init(false, getPublicKey());
MemoryStream mStr = new MemoryStream();
DEROutputStream derOut = new DEROutputStream(mStr);
derOut.writeObject(reqInfo);
derOut.Flush();
byte[] b = mStr.ToArray();
sig.update(b, 0, b.Length);
mStr.Close();
return(sig.verifySignature(sigBits.getBytes()));
}