diff --git a/crypto/src/asn1/crmf/EncryptedValueBuilder.cs b/crypto/src/asn1/crmf/EncryptedValueBuilder.cs
deleted file mode 100644
index 4b57156d4..000000000
--- a/crypto/src/asn1/crmf/EncryptedValueBuilder.cs
+++ /dev/null
@@ -1,53 +0,0 @@
-using System;
-using System.Collections;
-using System.Collections.Generic;
-using System.Text;
-using Org.BouncyCastle.Asn1.Nist;
-using Org.BouncyCastle.Crypto;
-using Org.BouncyCastle.Crypto.Engines;
-using Org.BouncyCastle.Crypto.Parameters;
-using Org.BouncyCastle.Utilities;
-
-namespace Org.BouncyCastle.Asn1.Crmf
-{
-
-// public delegate IBlockCipher BlockCipherCreator(ICipherParameters);
-//
-// public class EncryptedValueBuilder
-// {
-// private readonly IBlockCipher _cipher;
-// private static readonly IDictionary algToDelegate = Platform.CreateHashtable();
-// static EncryptedValueBuilder()
-// {
-// algToDelegate[NistObjectIdentifiers.IdAes128Cbc] = new CipherCreator()
-// {Creator = delegate(ICipherParameters param) { return new AesEngine(); }};
-//
-// }
-//
-//
-// public EncryptedValueBuilder(DerObjectIdentifier alg)
-// {
-//
-// }
-//
-//
-// private static IBlockCipher AesCBC(ICipherParameters param)
-// {
-// if (param is ParametersWithIV ivParam) {
-// return new
-// }
-// else
-// {
-// throw new ArgumentException("expecting param to be ParametersWithIv");
-// }
-// }
-//
-//
-//
-// private class CipherCreator
-// {
-// public BlockCipherCreator Creator { get; set; }
-// }
-//
-// }
-}
diff --git a/crypto/src/asn1/crmf/ProofOfPossessionSigningKeyBuilder.cs b/crypto/src/asn1/crmf/ProofOfPossessionSigningKeyBuilder.cs
deleted file mode 100644
index cbaf834a1..000000000
--- a/crypto/src/asn1/crmf/ProofOfPossessionSigningKeyBuilder.cs
+++ /dev/null
@@ -1,90 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Text;
-using Org.BouncyCastle.Asn1.X509;
-using Org.BouncyCastle.Crypto;
-using Org.BouncyCastle.Crypto.Operators;
-using Org.BouncyCastle.Crypto.Paddings;
-
-namespace Org.BouncyCastle.Asn1.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(PkMacFactory generator, char[] password)
- {
- IStreamCalculator calc = generator.CreateCalculator();
- byte[] d = _pubKeyInfo.GetDerEncoded();
- calc.Stream.Write(d, 0, d.Length);
- calc.Stream.Flush();
- calc.Stream.Close();
-
-
- this._publicKeyMAC = new PKMacValue(
- (AlgorithmIdentifier)generator.AlgorithmDetails,
- new DerBitString(((DefaultMacAndDigestResult)calc.GetResult()).MacResult));
-
- return this;
- }
-
- public PopoSigningKey build(ISignatureFactory signer)
- {
- if (_name != null && _publicKeyMAC != null)
- {
- throw new InvalidOperationException("name and publicKeyMAC cannot both be set.");
- }
-
- PopoSigningKeyInput popo;
- byte[] b;
- IStreamCalculator calc = signer.CreateCalculator();
- if (_certRequest != null)
- {
- popo = null;
- b = _certRequest.GetDerEncoded();
- calc.Stream.Write(b, 0, b.Length);
-
- }
- else if (_name != null)
- {
- popo = new PopoSigningKeyInput(_name, _pubKeyInfo);
- b = popo.GetDerEncoded();
- calc.Stream.Write(b, 0, b.Length);
- }
- else
- {
- popo = new PopoSigningKeyInput(_publicKeyMAC, _pubKeyInfo);
- b = popo.GetDerEncoded();
- calc.Stream.Write(b, 0, b.Length);
- }
-
- calc.Stream.Flush();
- calc.Stream.Close();
- DefaultSignatureResult res = (DefaultSignatureResult)calc.GetResult();
- return new PopoSigningKey(popo, (AlgorithmIdentifier)signer.AlgorithmDetails, new DerBitString(res.Collect()));
- }
-
-
- }
-}
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