public IStreamCalculator CreateCalculator()
{
ISigner verifier = SignerUtilities.InitSigner(X509Utilities.GetSignatureName(algID), false, publicKey, null);
return new DefaultVerifierCalculator(verifier);
}
/// <summary>
/// Base constructor.
/// </summary>
/// <param name="algorithm">The name of the signature algorithm to use.</param>
/// <param name="publicKey">The public key to be used in the verification operation.</param>
public Asn1VerifierFactory(string algorithm, AsymmetricKeyParameter publicKey)
{
if (algorithm == null)
throw new ArgumentNullException("algorithm");
if (publicKey == null)
throw new ArgumentNullException("publicKey");
if (publicKey.IsPrivate)
throw new ArgumentException("Key for verifying must be public", "publicKey");
DerObjectIdentifier sigOid = X509Utilities.GetAlgorithmOid(algorithm);
this.publicKey = publicKey;
this.algID = X509Utilities.GetSigAlgID(sigOid, algorithm);
}
/// <summary>
/// Constructor which also specifies a source of randomness to be used if one is required.
/// </summary>
/// <param name="algorithm">The name of the signature algorithm to use.</param>
/// <param name="privateKey">The private key to be used in the signing operation.</param>
/// <param name="random">The source of randomness to be used in signature calculation.</param>
public Asn1SignatureFactory(string algorithm, AsymmetricKeyParameter privateKey, SecureRandom random)
{
if (algorithm == null)
throw new ArgumentNullException("algorithm");
if (privateKey == null)
throw new ArgumentNullException("privateKey");
if (!privateKey.IsPrivate)
throw new ArgumentException("Key for signing must be private", "privateKey");
DerObjectIdentifier sigOid = X509Utilities.GetAlgorithmOid(algorithm);
this.algorithm = algorithm;
this.privateKey = privateKey;
this.random = random;
this.algID = X509Utilities.GetSigAlgID(sigOid, algorithm);
}