使用BouncyCastle在C#中读取DER私钥

Question

byte[] privatekey = File.ReadAllBytes(@"C:\Users\Luke\privkey.der");
var rsaKeyParameters = (RsaKeyParameters)PrivateKeyFactory.CreateKey(privatekey);

以前有人这么做过吗？谢谢

Answer 1

问题是我假设PublicKeyFactory和PrivateKeyFactory是互补的，因为它们在同一个命名空间中。他们不是！

为了解码私钥，我需要以下替代代码：

var privKeyObj = Asn1Object.FromStream(privatekey);
var privStruct = new RsaPrivateKeyStructure((Asn1Sequence)privKeyObj);

// Conversion from BouncyCastle to .Net framework types
var rsaParameters = new RSAParameters();
rsaParameters.Modulus = privStruct.Modulus.ToByteArrayUnsigned();
rsaParameters.Exponent = privStruct.PublicExponent.ToByteArrayUnsigned();
rsaParameters.D = privStruct.PrivateExponent.ToByteArrayUnsigned();
rsaParameters.P = privStruct.Prime1.ToByteArrayUnsigned();
rsaParameters.Q = privStruct.Prime2.ToByteArrayUnsigned();
rsaParameters.DP = privStruct.Exponent1.ToByteArrayUnsigned();
rsaParameters.DQ = privStruct.Exponent2.ToByteArrayUnsigned();
rsaParameters.InverseQ = privStruct.Coefficient.ToByteArrayUnsigned();
var rsa = new RSACryptoServiceProvider();
rsa.ImportParameters(rsaParameters);
return Encoding.UTF8.GetString(rsa.Decrypt(Convert.FromBase64String(ciphertext), true));

非常感谢猫头鹰的帮助。