NetCore 下使用RSA加密，解密；并且前端使用jsencrypt.js实现Rsa相关方法。

• RSACryptoServiceProvider
  在Windows 环境下依然可以使用RSACryptoServiceProvider, 但在Linux 环境下编译不过. 参考 dudu 的文章 .net core中使用openssl的公钥私钥进行加解密

• FromXmlString方法和ToXmlString
  由于不在使用RSACryptoServiceProvider这两个方法不在提供,我们可以通过扩展方法来添加这两个方法,以处理C#生成的密钥.

 1 public struct RSAKey 2 { 3 ???????public string privateKey { get; set; } 4 ?5 ???????public string publicKey { get; set; } 6 } 7 ?8 public static RSAKey GetKey() 9 {10 ???????var key = new RSAKey();11 ???????Org.BouncyCastle.Crypto.Generators.RsaKeyPairGenerator g = new Org.BouncyCastle.Crypto.Generators.RsaKeyPairGenerator();12 ???????g.Init(new Org.BouncyCastle.Crypto.KeyGenerationParameters(new SecureRandom(), 1024));13 ???????var pair = g.GenerateKeyPair();14 ???????PrivateKeyInfo privateKeyInfo = PrivateKeyInfoFactory.CreatePrivateKeyInfo(pair.Private);15 ???????byte[] serializedPrivateBytes = privateKeyInfo.ToAsn1Object().GetDerEncoded();16 ???????key.privateKey = Convert.ToBase64String(serializedPrivateBytes);//PEM秘钥17 18 ???????SubjectPublicKeyInfo publicKeyInfo = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(pair.Public);19 ???????byte[] serializedPublicBytes = publicKeyInfo.ToAsn1Object().GetDerEncoded();20 ???????key.publicKey = Convert.ToBase64String(serializedPublicBytes);//PEM公钥21 22 ???????return key;23 }

 1 public static string RSAXmlPrivateKey(string privateKey) 2 { 3 ???????RsaPrivateCrtKeyParameters privateKeyParam = (RsaPrivateCrtKeyParameters)PrivateKeyFactory.CreateKey(Convert.FromBase64String(privateKey)); 4 ?5 ???????return string.Format("<RSAKeyValue><Modulus>{0}</Modulus><Exponent>{1}</Exponent><P>{2}</P><Q>{3}</Q><DP>{4}</DP><DQ>{5}</DQ><InverseQ>{6}</InverseQ><D>{7}</D></RSAKeyValue>", 6 ????????????????????Convert.ToBase64String(privateKeyParam.Modulus.ToByteArrayUnsigned()), 7 ????????????????????Convert.ToBase64String(privateKeyParam.PublicExponent.ToByteArrayUnsigned()), 8 ????????????????????Convert.ToBase64String(privateKeyParam.P.ToByteArrayUnsigned()), 9 ????????????????????Convert.ToBase64String(privateKeyParam.Q.ToByteArrayUnsigned()),10 ????????????????????Convert.ToBase64String(privateKeyParam.DP.ToByteArrayUnsigned()),11 ????????????????????Convert.ToBase64String(privateKeyParam.DQ.ToByteArrayUnsigned()),12 ????????????????????Convert.ToBase64String(privateKeyParam.QInv.ToByteArrayUnsigned()),13 ????????????????????Convert.ToBase64String(privateKeyParam.Exponent.ToByteArrayUnsigned()));14 }15 16 public static string RSAXmlPublicKey(string publicKey)17 {18 ???????RsaKeyParameters publicKeyParam = (RsaKeyParameters)PublicKeyFactory.CreateKey(Convert.FromBase64String(publicKey));19 ???????return string.Format("<RSAKeyValue><Modulus>{0}</Modulus><Exponent>{1}</Exponent></RSAKeyValue>",20 ????????????????????Convert.ToBase64String(publicKeyParam.Modulus.ToByteArrayUnsigned()),21 ????????????????????Convert.ToBase64String(publicKeyParam.Exponent.ToByteArrayUnsigned()));22 }

public static RSAParameters FromXmlString( string xmlString){ ???????RSAParameters parameters = new RSAParameters(); ???????XmlDocument xmlDoc = new XmlDocument(); ???????xmlDoc.LoadXml(xmlString); ???????if (xmlDoc.DocumentElement.Name.Equals("RSAKeyValue")) ???????{ ?????????????foreach (XmlNode node in xmlDoc.DocumentElement.ChildNodes) ?????????????{ ??????????????????switch (node.Name) ??????????????????{ ???????????????????????????case "Modulus": parameters.Modulus = Convert.FromBase64String(node.InnerText); break; ???????????????????????????case "Exponent": parameters.Exponent = Convert.FromBase64String(node.InnerText); break; ???????????????????????????case "P": parameters.P = Convert.FromBase64String(node.InnerText); break; ???????????????????????????case "Q": parameters.Q = Convert.FromBase64String(node.InnerText); break; ???????????????????????????case "DP": parameters.DP = Convert.FromBase64String(node.InnerText); break; ???????????????????????????case "DQ": parameters.DQ = Convert.FromBase64String(node.InnerText); break; ???????????????????????????case "InverseQ": parameters.InverseQ = Convert.FromBase64String(node.InnerText); break; ???????????????????????????case "D": parameters.D = Convert.FromBase64String(node.InnerText); break; ???????????????????} ?????????????} ???????} ???????else ???????{ ?????????????throw new Exception("Invalid XML RSA key."); ???????} ???????return parameters;}

//加密
public static string RSA_Encrypt(string context, RSAKey key){ ???????UnicodeEncoding ByteConverter = new UnicodeEncoding(); ???????byte[] DataToEncrypt = ByteConverter.GetBytes(context); ???????try ???????{ ???????????????????RSACryptoServiceProvider RSA = new RSACryptoServiceProvider(); ???????????????????RSA.ImportParameters(FromXmlString(RSAXmlPublicKey( key.publicKey)));//OAEP padding is only available on Microsoft Windows XP or later. ????????????????????byte[] bytes_Cypher_Text = RSA.Encrypt(DataToEncrypt, false); ???????????????????string str_Cypher_Text = Convert.ToBase64String(bytes_Cypher_Text); ???????????????????return str_Cypher_Text; ????????} ????????catch (CryptographicException e) ????????{ ???????????????????Console.WriteLine(e.Message); ???????????????????return null; ????????}}

//RSA解密public static string RSA_Decrypt(string context, string str_Private_Key){ ???????????????byte[] DataToDecrypt = Convert.FromBase64String(context); ???????????????try ???????????????{ ???????????????????RSACryptoServiceProvider RSA = new RSACryptoServiceProvider(); ???????????????????RSA.ImportParameters(FromXmlString(RSAPrivateKeyJava2DotNet(str_Private_Key)));//OAEP padding is only available on Microsoft Windows XP or later. ????????????????????byte[] bytes_Plain_Text = RSA.Decrypt(DataToDecrypt, false); ???????????????????UnicodeEncoding ByteConverter = new UnicodeEncoding(); ???????????????????string str_Plain_Text = ByteConverter.GetString(bytes_Plain_Text); ???????????????????return str_Plain_Text; ???????????????} ???????????????catch (CryptographicException e) ???????????????{ ???????????????????Console.WriteLine(e.ToString()); ???????????????????return null; ???????????????}}

<!doctype html><html> ?<head> ???<title>JavaScript RSA Encryption</title> ???<script src="http://code.jquery.com/jquery-1.8.3.min.js"></script> ???<script src="bin/jsencrypt.min.js"></script> ???<script type="text/javascript"> ?????// Call this code when the page is done loading. ?????$(function() { ???????// Run a quick encryption/decryption when they click. ???????$(‘#testme‘).click(function() { ?????????// Encrypt with the public key... ?????????var encrypt = new JSEncrypt(); ?????????encrypt.setPublicKey($(‘#pubkey‘).val()); ?????????var encrypted = encrypt.encrypt($(‘#input‘).val()); ?????????// Decrypt with the private key... ?????????var decrypt = new JSEncrypt(); ?????????decrypt.setPrivateKey($(‘#privkey‘).val()); ?????????var uncrypted = decrypt.decrypt(encrypted); ?????????// Now a simple check to see if the round-trip worked. ?????????if (uncrypted == $(‘#input‘).val()) { ???????????alert(‘It works!!!‘); ?????????} ?????????else { ???????????alert(‘Something went wrong....‘); ?????????} ???????}); ?????}); ???</script> ?</head> ?<body> ???<label for="privkey">Private Key</label><br/> ???<textarea id="privkey" rows="15" cols="65">-----BEGIN RSA PRIVATE KEY-----MIICXQIBAAKBgQDlOJu6TyygqxfWT7eLtGDwajtNFOb9I5XRb6khyfD1Yt3YiCgQWMNW649887VGJiGr/L5i2osbl8C9+WJTeucF+S76xFxdU6jE0NQ+Z+zEdhUTooNRaY5nZiu5PgDB0ED/ZKBUSLKL7eibMxZtMlUDHjm4gwQco1KRMDSmXSMkDwIDAQABAoGAfY9LpnuWK5Bs50UVep5c93SJdUi82u7yMx4iHFMc/Z2hfenfYEzu+57fI4fvxTQ//5DbzRR/XKb8ulNv6+CHyPF31xk7YOBfkGI8qjLoq06V+FyBfDSwL8KbLyeHm7KUZnLNQbk8yGLzB3iYKkRHlmUanQGaNMIJziWOkN+N9dECQQD0ONYRNZeuM8zd8XJTSdcIX4a3gy3GGCJxOzv16XHxD03GW6UNLmfPwenKu+cdrQeaqEixrCejXdAFz/7+BSMpAkEA8EaSOeP5Xr3ZrbiKzi6TGMwHMvC7HdJxaBJbVRfApFrE0/mPwmP5rN7QwjrMY+0+AbXcm8mRQyQ1+IGEembsdwJBAN6az8Rv7QnD/YBvi52POIlRSSIMV7SwWvSK4WSMnGb1ZBbhgdg57DXaspcwHsFV7hByQ5BvMtIduHcT14ECfcECQATeaTgjFnqE/lQ22Rk0eGaYO80cc643BXVGafNfd9fcvwBMnk0iGX0XRsOozVt5AzilpsLBYuApa66NcVHJpCECQQDTjI2AQhFc1yRnCU/YgDnSpJVm1nASoRUnU8Jfm3Ozuku7JUXcVpt08DFSceCEX9unCuMcT72rAQlLpdZir876-----END RSA PRIVATE KEY-----</textarea><br/> ???<label for="pubkey">Public Key</label><br/> ???<textarea id="pubkey" rows="15" cols="65">-----BEGIN PUBLIC KEY-----MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDlOJu6TyygqxfWT7eLtGDwajtNFOb9I5XRb6khyfD1Yt3YiCgQWMNW649887VGJiGr/L5i2osbl8C9+WJTeucF+S76xFxdU6jE0NQ+Z+zEdhUTooNRaY5nZiu5PgDB0ED/ZKBUSLKL7eibMxZtMlUDHjm4gwQco1KRMDSmXSMkDwIDAQAB-----END PUBLIC KEY-----</textarea><br/> ???<label for="input">Text to encrypt:</label><br/> ???<textarea id="input" name="input" type="text" rows=4 cols=70>This is a test!</textarea><br/> ???<input id="testme" type="button" value="Test Me!!!" /><br/> ?</body></html>