C# 调用BouncyCastle生成PEM格式的私钥和公钥 , 加密解密 PKCS#1

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引用第三方类库 BouncyCastle

nuget: https://www.nuget.org/packages/BouncyCastle

网址: http://www.bouncycastle.org/csharp/index.html

1.生成 pem 私钥

TextWriter textWriter = new StringWriter();
PemWriter pemWriter = new PemWriter(textWriter);
pemWriter.WriteObject(keys.Private);
pemWriter.Writer.Flush();string privateKey = textWriter.ToString();

//公钥

 TextWriter textpubWriter = new StringWriter();PemWriter pempubWriter = new PemWriter(textpubWriter);pempubWriter.WriteObject(keys.Public);pempubWriter.Writer.Flush();string pubKey = textpubWriter.ToString();

生成结果

公钥:

私钥

2. 使用pem 证书解密或解密. 公钥私钥类型不一样

使用公钥加解密:

using (TextReader reader = new StringReader(pubkeyPemString}))  
{var enType=true; //加密true  解密 false;var key = new Org.BouncyCastle.OpenSsl.PemReader(reader).ReadObject() as AsymmetricKeyParameter;var rsa = new RsaEngine();rsa.Init(enType, key);  var data = Encoding.UTF8.GetBytes(tb_input.Text);entData = rsa.ProcessBlock(data, 0, data.Length);tb_output.Text = "加密: \r\n\r\n" + Encoding.UTF8.GetString(entData);}

使用私钥加解密: 私钥中带有公钥信息.解析出来的是密钥对AsymmetricCipherKeyPair

using (TextReader reader2 = new StringReader(tb_privitekey.Text))
{dynamic key = new Org.BouncyCastle.OpenSsl.PemReader(reader2).ReadObject();var rsa2 = new RsaEngine();if (key is AsymmetricKeyParameter){key = (AsymmetricKeyParameter)key;}else if(key is AsymmetricCipherKeyPair){key = ((AsymmetricCipherKeyPair)key).Private;}rsa2.Init(false, key);  //加密true 解密 false//entData 待加密解密的 串 byte[] entData= Encoding.UTF8.GetBytes(tb_input.Text);entData = rsa2.ProcessBlock(entData, 0, entData.Length);tb_output.Text += "解密:\r\n \r\n" + Encoding.UTF8.GetString(entData);
}

参考文章:

c#.net 调用BouncyCastle生成PEM格式的私钥和公钥 https://www.cnblogs.com/runliuv/p/5965951.html

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