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using System;
using System.IO;
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.Crmf;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.Operators;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Crmf
{
public class ProofOfPossessionSigningKeyBuilder
{
private CertRequest _certRequest;
private SubjectPublicKeyInfo _pubKeyInfo;
private GeneralName _name;
private PKMacValue _publicKeyMAC;
public ProofOfPossessionSigningKeyBuilder(CertRequest certRequest)
{
this._certRequest = certRequest;
}
public ProofOfPossessionSigningKeyBuilder(SubjectPublicKeyInfo pubKeyInfo)
{
this._pubKeyInfo = pubKeyInfo;
}
public ProofOfPossessionSigningKeyBuilder SetSender(GeneralName name)
{
this._name = name;
return this;
}
public ProofOfPossessionSigningKeyBuilder SetPublicKeyMac(PKMacBuilder generator, char[] password)
{
IMacFactory fact = generator.Build(password);
return ImplSetPublicKeyMac(fact);
}
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
public ProofOfPossessionSigningKeyBuilder SetPublicKeyMac(PKMacBuilder generator, ReadOnlySpan<char> password)
{
IMacFactory fact = generator.Build(password);
return ImplSetPublicKeyMac(fact);
}
#endif
public PopoSigningKey Build(ISignatureFactory signer)
{
if (_name != null && _publicKeyMAC != null)
throw new InvalidOperationException("name and publicKeyMAC cannot both be set.");
PopoSigningKeyInput popo;
IStreamCalculator<IBlockResult> calc = signer.CreateCalculator();
using (Stream sigStream = calc.Stream)
{
if (_certRequest != null)
{
popo = null;
_certRequest.EncodeTo(sigStream, Asn1Encodable.Der);
}
else if (_name != null)
{
popo = new PopoSigningKeyInput(_name, _pubKeyInfo);
popo.EncodeTo(sigStream, Asn1Encodable.Der);
}
else
{
popo = new PopoSigningKeyInput(_publicKeyMAC, _pubKeyInfo);
popo.EncodeTo(sigStream, Asn1Encodable.Der);
}
}
var signature = calc.GetResult().Collect();
return new PopoSigningKey(popo, (AlgorithmIdentifier)signer.AlgorithmDetails, new DerBitString(signature));
}
private ProofOfPossessionSigningKeyBuilder ImplSetPublicKeyMac(IMacFactory fact)
{
byte[] d = _pubKeyInfo.GetDerEncoded();
IStreamCalculator<IBlockResult> calc = fact.CreateCalculator();
using (var stream = calc.Stream)
{
stream.Write(d, 0, d.Length);
}
this._publicKeyMAC = new PKMacValue(
(AlgorithmIdentifier)fact.AlgorithmDetails,
new DerBitString(calc.GetResult().Collect()));
return this;
}
}
}
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