/// <summary>
/// Instanciate a PKCS10CertificationRequest object with the necessary credentials.
/// </summary>
///<param name="signatureAlgorithm">Name of Sig Alg.</param>
/// <param name="subject">X509Name of subject eg OU="My unit." O="My Organisatioin" C="au" </param>
/// <param name="key">Public Key to be included in cert reqest.</param>
/// <param name="attributes">ASN1Set of Attributes.</param>
/// <param name="signingKey">Matching Private key for nominated (above) public key to be used to sign the request.</param>
public PKCS10CertificationRequest(String signatureAlgorithm,
X509Name subject,
AsymmetricKeyParameter key,
ASN1Set attributes,
AsymmetricKeyParameter signingKey)
{
DERObjectIdentifier sigOID = SignerUtil.getObjectIdentifier(signatureAlgorithm.ToUpper());
if (sigOID == null)
{
throw new ArgumentException("Unknown signature type requested");
}
if (subject == null)
{
throw new ArgumentException("subject must not be null");
}
if (key == null)
{
throw new ArgumentException("public key must not be null");
}
this.sigAlgId = new AlgorithmIdentifier(sigOID, null);
SubjectPublicKeyInfo pubInfo = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(key);
this.reqInfo = new CertificationRequestInfo(subject, pubInfo, attributes);
Signer sig = null;
// Create appropriate Signature.
sig = SignerUtil.getSigner(sigAlgId.getObjectId());
sig.init(true, signingKey);
// Encode.
MemoryStream mStr = new MemoryStream();
DEROutputStream derOut = new DEROutputStream(mStr);
derOut.writeObject(reqInfo);
// Sign
byte[] b = mStr.ToArray();
sig.update(b, 0, b.Length);
// Generate Signature.
sigBits = new DERBitString(sig.generateSignature());
}
/// <summary>
/// Set the signature algorithm that will be used to sign this certificate.
/// </summary>
/// <param name="signatureAlgorithm"></param>
public void setSignatureAlgorithm(String signatureAlgorithm)
{
sigOID = SignerUtil.getObjectIdentifier(signatureAlgorithm);
if (sigOID == null)
{
throw new Exception("Unknown signature type requested");
}
sigAlgId = new AlgorithmIdentifier(this.sigOID, new DERNull());
tbsGen.setSignature(sigAlgId);
}