using Org.BouncyCastle.Asn1; using Org.BouncyCastle.Asn1.X509; using Org.BouncyCastle.Security; using System; namespace Org.BouncyCastle.Crypto.Operators { public class Asn1VerifierFactory : IVerifierFactory { private readonly AlgorithmIdentifier algID; private readonly AsymmetricKeyParameter publicKey; public object AlgorithmDetails => algID; 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 algorithmOid = X509Utilities.GetAlgorithmOid(algorithm); this.publicKey = publicKey; algID = X509Utilities.GetSigAlgID(algorithmOid, algorithm); } public Asn1VerifierFactory(AlgorithmIdentifier algorithm, AsymmetricKeyParameter publicKey) { this.publicKey = publicKey; algID = algorithm; } public IStreamCalculator<IVerifier> CreateCalculator() { return new DefaultVerifierCalculator(SignerUtilities.InitSigner(X509Utilities.GetSignatureName(algID), false, publicKey, null)); } } }