对`PublicKeyFactory.CreateKey（）`的反操作 [英] Inverse operation to `PublicKeyFactory.CreateKey()`

问题描述

使用带有C＃的Bouncycastle，什么是相反的操作？

Using Bouncycastle with C#, what is the inverse operation to:

byte[] publicKey;
AsymmetricKeyParameter asymmetricKeyParameter = PublicKeyFactory.CreateKey(publicKey);
RsaKeyParameters rsaKeyParameters = (RsaKeyParameters)asymmetricKeyParameter;

即我有一个包含公用密钥的 RsaKeyParameters 对象，并希望将其转换为字节数组，以便可以将其反馈给 PublicKeyFactory .CreateKey（）

I.e. I have a RsaKeyParameters object containing a public key and want to convert it to a byte array in such a way that I could feed it back in to PublicKeyFactory.CreateKey()

推荐答案

公钥的逆运算应为：

byte[] publicKey = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(rsaKeyParameters).GetDerEncoded();

该工厂类位于Org.BouncyCastle.X509命名空间中。

That factory class is in the Org.BouncyCastle.X509 namespace.

对于私钥，相应的工厂类为Org.BouncyCastle.Security.PrivateKeyFactory和Org.BouncyCastle.Pkcs.PrivateKeyInfoFactory / EncryptedPrivateKeyInfoFactory。

For private keys, the corresponding factory classes are Org.BouncyCastle.Security.PrivateKeyFactory and Org.BouncyCastle.Pkcs.PrivateKeyInfoFactory/EncryptedPrivateKeyInfoFactory.

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