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output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Crmf/ProofOfPossessionSigningKeyBuilder.cs

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+using System;
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Asn1.Crmf;
+using Org.BouncyCastle.Asn1.X509;
+using Org.BouncyCastle.Crypto;
+using Org.BouncyCastle.Crypto.Operators;
+
+namespace Org.BouncyCastle.Crmf;
+
+public class ProofOfPossessionSigningKeyBuilder
+{
+	private CertRequest _certRequest;
+
+	private SubjectPublicKeyInfo _pubKeyInfo;
+
+	private GeneralName _name;
+
+	private PKMacValue _publicKeyMAC;
+
+	public ProofOfPossessionSigningKeyBuilder(CertRequest certRequest)
+	{
+		_certRequest = certRequest;
+	}
+
+	public ProofOfPossessionSigningKeyBuilder(SubjectPublicKeyInfo pubKeyInfo)
+	{
+		_pubKeyInfo = pubKeyInfo;
+	}
+
+	public ProofOfPossessionSigningKeyBuilder SetSender(GeneralName name)
+	{
+		_name = name;
+		return this;
+	}
+
+	public ProofOfPossessionSigningKeyBuilder SetPublicKeyMac(PKMacBuilder generator, char[] password)
+	{
+		IMacFactory macFactory = generator.Build(password);
+		IStreamCalculator streamCalculator = macFactory.CreateCalculator();
+		byte[] derEncoded = _pubKeyInfo.GetDerEncoded();
+		streamCalculator.Stream.Write(derEncoded, 0, derEncoded.Length);
+		streamCalculator.Stream.Flush();
+		streamCalculator.Stream.Close();
+		_publicKeyMAC = new PKMacValue((AlgorithmIdentifier)macFactory.AlgorithmDetails, new DerBitString(((IBlockResult)streamCalculator.GetResult()).Collect()));
+		return this;
+	}
+
+	public PopoSigningKey Build(ISignatureFactory signer)
+	{
+		if (_name != null && _publicKeyMAC != null)
+		{
+			throw new InvalidOperationException("name and publicKeyMAC cannot both be set.");
+		}
+		IStreamCalculator streamCalculator = signer.CreateCalculator();
+		PopoSigningKeyInput popoSigningKeyInput;
+		if (_certRequest != null)
+		{
+			popoSigningKeyInput = null;
+			byte[] derEncoded = _certRequest.GetDerEncoded();
+			streamCalculator.Stream.Write(derEncoded, 0, derEncoded.Length);
+		}
+		else if (_name != null)
+		{
+			popoSigningKeyInput = new PopoSigningKeyInput(_name, _pubKeyInfo);
+			byte[] derEncoded = popoSigningKeyInput.GetDerEncoded();
+			streamCalculator.Stream.Write(derEncoded, 0, derEncoded.Length);
+		}
+		else
+		{
+			popoSigningKeyInput = new PopoSigningKeyInput(_publicKeyMAC, _pubKeyInfo);
+			byte[] derEncoded = popoSigningKeyInput.GetDerEncoded();
+			streamCalculator.Stream.Write(derEncoded, 0, derEncoded.Length);
+		}
+		streamCalculator.Stream.Flush();
+		streamCalculator.Stream.Close();
+		DefaultSignatureResult defaultSignatureResult = (DefaultSignatureResult)streamCalculator.GetResult();
+		return new PopoSigningKey(popoSigningKeyInput, (AlgorithmIdentifier)signer.AlgorithmDetails, new DerBitString(defaultSignatureResult.Collect()));
+	}
+}