C#中RSA加密與解密的實例詳解

2020-01-24 00:01:26

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1. RSA加密與解密 -- 使用公鑰加密、私鑰解密

public class RSATool {  public string Encrypt(string strText, string strPublicKey)  {   RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();   rsa.FromXmlString(strPublicKey);   byte[] byteText = Encoding.UTF8.GetBytes(strText);   byte[] byteEntry = rsa.Encrypt(byteText, false);   return Convert.ToBase64String(byteEntry);  }  public string Decrypt(string strEntryText,string strPrivateKey)  {   RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();   rsa.FromXmlString(strPrivateKey);   byte[] byteEntry = Convert.FromBase64String(strEntryText);   byte[] byteText = rsa.Decrypt(byteEntry, false);   return Encoding.UTF8.GetString(byteText);  }  public Dictionary<string,string> GetKey()  {   Dictionary<string, string> dictKey = new Dictionary<string, string>();   RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();   dictKey.Add("PublicKey", rsa.ToXmlString(false));   dictKey.Add("PrivateKey", rsa.ToXmlString(true));   return dictKey;  } }

測試：

RSATool myRSA = new RSATool();   Dictionary<string, string> dictK = new Dictionary<string, string>();   dictK = myRSA.GetKey();   string strText = "123456";   Console.WriteLine("要加密的字符串是：{0}", strText);   string str1 = myRSA.Encrypt("123456", dictK["PublicKey"]);   Console.WriteLine("加密后的字符串：{0}", str1);   string str2 = myRSA.Decrypt(str1, dictK["PrivateKey"]);   Console.WriteLine("解密后的字符串：{0}", str2);

2. RSA加密與解密 -- 使用同一個密鑰容器進行加密與解密

 public class RSAToolX {  public string Encrypt(string strText)  {   CspParameters CSApars = new CspParameters();   CSApars.KeyContainerName = "Test001";   RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(CSApars);   byte[] byteText = Encoding.UTF8.GetBytes(strText);   byte[] byteEntry = rsa.Encrypt(byteText, false);   return Convert.ToBase64String(byteEntry);  }  public string Decrypt(string strEntryText)  {   CspParameters CSApars = new CspParameters();   CSApars.KeyContainerName = "Test001";   RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(CSApars);   byte[] byteEntry = Convert.FromBase64String(strEntryText);   byte[] byteText = rsa.Decrypt(byteEntry, false);   return Encoding.UTF8.GetString(byteText);  } }

測試：

RSAToolX myRSA = new RSAToolX();   string strText = "123456";   Console.WriteLine("要加密的字符串是：{0}", strText);   string str1 = myRSA.Encrypt("123456");   Console.WriteLine("加密后的字符串：{0}", str1);   string str2 = myRSA.Decrypt(str1);   Console.WriteLine("解密后的字符串：{0}", str2);