Csharp 从 C# 中的 PEM ed25519 获取公钥和私钥

Ed25519可以在上实现.NET，例如BouncyCastle，并在这两个平台上运行.NET框架和.净核心.

BouncyCastle还提供了一种使用PemReader类导入directly个PEM密钥的方法.

例子:

using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Crypto.Signers;
using Org.BouncyCastle.OpenSsl;
using System;
using System.IO;
using System.Text;

...

//
// Signing
//

// Import private key
string ed25519pkcs8 = @"-----BEGIN PRIVATE KEY-----
                        MC4CAQAwBQYDK2VwBCIEIAYIsKL0xkTkAXDhUN6eDheqODEOGyFZ04jsgFNCFxZf
                        -----END PRIVATE KEY-----";
PemReader pemReaderPrivate = new PemReader(new StringReader(ed25519pkcs8));
Ed25519PrivateKeyParameters ed25519pkcs8Parameters = (Ed25519PrivateKeyParameters)pemReaderPrivate.ReadObject();

// Sign
byte[] dataToSign = Encoding.UTF8.GetBytes("The quick brown fox jumps over the lazy dog");
ISigner signer = new Ed25519Signer();
signer.Init(true, ed25519pkcs8Parameters);
signer.BlockUpdate(dataToSign, 0, dataToSign.Length);
byte[] signature = signer.GenerateSignature();
Console.WriteLine("Signature: " + Convert.ToBase64String(signature)); // Signature: MTAK9rOibXN1RBOP3O6cRf7Dut1wS6pdz9xM11NIMjg/G0vEusn0piL1iTUcVZvfPNr4PHZSsjp6qX9HkCKRCw==

//
// Verifying
//

// Import public key
string ed25519x509 = @"-----BEGIN PUBLIC KEY-----
                      MCowBQYDK2VwAyEA3mcwgf2DrWLR3mQ6l2d59bGU6qUStwQrln2+rKlKxoA=
                      -----END PUBLIC KEY-----";
PemReader pemReaderPublic = new PemReader(new StringReader(ed25519x509));
Ed25519PublicKeyParameters ed25519x509Parameters = (Ed25519PublicKeyParameters)pemReaderPublic.ReadObject();

// Verify
ISigner verifier = new Ed25519Signer();
verifier.Init(false, ed25519x509Parameters);
verifier.BlockUpdate(dataToSign, 0, dataToSign.Length);
bool verified = verifier.VerifySignature(signature);
Console.WriteLine("Verification: " + verified); // Verification: True

对于输出:

Signature: MTAK9rOibXN1RBOP3O6cRf7Dut1wS6pdz9xM11NIMjg/G0vEusn0piL1iTUcVZvfPNr4PHZSsjp6qX9HkCKRCw==
Verification: True