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Posted on 11/4/2015 12:37:23 PM
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The project requirements, generate a private key and public key, encrypt with public key, decrypt with private key, I implemented it like this,
I hope to be of help to friends who have this need.
The source code is as follows:
1. Generate a pair of keys:
/// <summary>
/// generate private key and public key arr[0] for private key arr[1] for public key
/// </summary>
/// <returns></returns>
public static string[] GenerateKeys()
{
string[] sKeys = new String[2];
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
sKeys[0] = rsa. ToXmlString(true);
sKeys[1] = rsa. ToXmlString(false);
return sKeys;
}
2. Encryption:
/// <summary>
/// RSA Encrypt
/// </summary>
/// <param name="sSource" >Source string</param>
/// <param name="sPublicKey" >public key</param>
/// <returns></returns>
public static string EncryptString(string sSource,string sPublicKey)
{
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
string plaintext = sSource;
rsa. FromXmlString(sPublicKey);
byte[] cipherbytes;
byte[] byteEn = rsa. Encrypt(Encoding.UTF8.GetBytes("a"), false);
cipherbytes = rsa. Encrypt(Encoding.UTF8.GetBytes(plaintext), false);
StringBuilder sbString = new StringBuilder();
for (int i = 0; i < cipherbytes. Length; i++)
{
sbString.Append(cipherbytes+ ",");
}
3. Decryption:
/// <summary>
/// RSA Decrypt
/// </summary>
/// <param name="sSource">Source string</param>
/// <param name="sPrivateKey">Private Key</param>
/// <returns></returns>
public static string DecryptString(String sSource, string sPrivateKey)
{
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
rsa. FromXmlString(sPrivateKey);
byte[] byteEn = rsa. Encrypt(Encoding.UTF8.GetBytes("a"), false);
string[] sBytes = sSource.Split(',');
for (int j = 0; j < sBytes.Length; j++)
{
if (sBytes[j] != "")
{
byteEn[j] = Byte.Parse(sBytes[j]);
}
}
byte[] plaintbytes = rsa. Decrypt(byteEn, false);
return Encoding.UTF8.GetString(plaintbytes);
}
return sbString.ToString();
}
--------------------------------------------------------------------
RSA encryption and decryption source code:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;
namespace MyRSA
namespace MyRSA
{
publicclass MyRSA
{
privatestaticstring publicKey =
"<RSAKeyValue><Modulus>6CdsXgYOyya/yQH"+
"TO96dB3gEurM2UQDDVGrZoe6RcAVTxAqDDf5L"+
"wPycZwtNOx3Cfy44/D5Mj86koPew5soFIz9sx"+
"PAHRF5hcqJoG+q+UfUYTHYCsMH2cnqGVtnQiE"+
"/PMRMmY0RwEfMIo+TDpq3QyO03MaEsDGf13sP"+
"w9YRXiac=</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>";
privatestaticstring privateKey =
"<RSAKeyValue><Modulus>6CdsXgYOyya/yQH"+
"TO96dB3gEurM2UQDDVGrZoe6RcAVTxAqDDf5L"+
"wPycZwtNOx3Cfy44/D5Mj86koPew5soFIz9sx"+
"PAHRF5hcqJoG+q+UfUYTHYCsMH2cnqGVtnQiE"+
"/PMRMmY0RwEfMIo+TDpq3QyO03MaEsDGf13sP"+
"w9YRXiac=</Modulus><Exponent>AQAB</Exponent>"+
"<P>/aoce2r6tonjzt1IQI6FM4ysR40j/gKvt4d"+
"L411pUop1Zg61KvCm990M4uN6K8R/DUvAQdrRd"+
"VgzvvAxXD7ESw==</P><Q>6kqclrEunX/fmOle"+
"VTxG4oEpXY4IJumXkLpylNR3vhlXf6ZF9obEpG"+
"lq0N7sX2HBxa7T2a0WznOAb0si8FuelQ==</Q>"+
"<DP>3XEvxB40GD5v/Rr4BENmzQW1MBFqpki6FU"+
"GrYiUd2My+iAW26nGDkUYMBdYHxUWYlIbYo6Te"+
"zc3d/oW40YqJ2Q==</DP><DQ>LK0XmQCmY/ArY"+
"gw2Kci5t51rluRrl4f5l+aFzO2K+9v3PGcndjA"+
"StUtIzBWGO1X3zktdKGgCLlIGDrLkMbM21Q==</DQ><InverseQ>"+
"GqC4Wwsk2fdvJ9dmgYlej8mTDBWg0Wm6aqb5kjn"+
"cWK6WUa6CfD+XxfewIIq26+4Etm2A8IAtRdwPl4"+
"aPjSfWdA==</InverseQ><D>a1qfsDMY8DSxB2D"+
"Cr7LX5rZHaZaqDXdO3GC01z8dHjI4dDVwOS5ZFZ"+
"s7MCN3yViPsoRLccnVWcLzOkSQF4lgKfTq3IH40"+
"H5N4gg41as9GbD0g9FC3n5IT4VlVxn9ZdW+WQry"+
"oHdbiIAiNpFKxL/DIEERur4sE1Jt9VdZsH24CJE=</D></RSAKeyValue>";
staticpublicstring Decrypt(string base64code)
{
try
{
//Create a UnicodeEncoder to convert between byte array and string.
UnicodeEncoding ByteConverter =new UnicodeEncoding();
//Create a new instance of RSACryptoServiceProvider to generate
//public and private key data.
RSACryptoServiceProvider RSA =new RSACryptoServiceProvider();
RSA. FromXmlString(privateKey);
byte[] encryptedData;
byte[] decryptedData;
encryptedData = Convert.FromBase64String(base64code);
//Pass the data to DECRYPT, the private key information
//(using RSACryptoServiceProvider.ExportParameters(true),
//and a boolean flag specifying no OAEP padding.
decryptedData = RSADecrypt(
encryptedData, RSA. ExportParameters(true), false);
//Display the decrypted plaintext to the console.
return ByteConverter.GetString(decryptedData);
}
catch (Exception exc)
{
//Exceptions.LogException(exc);
Console.WriteLine(exc. Message);
return"";
}
}
staticpublicstring Encrypt(string toEncryptString)
{
try
{
//Create a UnicodeEncoder to convert between byte array and string.
UnicodeEncoding ByteConverter =new UnicodeEncoding();
//Create byte arrays to hold original, encrypted, and decrypted data.
byte[] dataToEncrypt =
ByteConverter.GetBytes(toEncryptString);
byte[] encryptedData;
byte[] decryptedData;
//Create a new instance of RSACryptoServiceProvider to generate
//public and private key data.
RSACryptoServiceProvider RSA =new RSACryptoServiceProvider();
RSA. FromXmlString(privateKey);
//Pass the data to ENCRYPT, the public key information
//(using RSACryptoServiceProvider.ExportParameters(false),
//and a boolean flag specifying no OAEP padding.
encryptedData = RSAEncrypt(
dataToEncrypt, RSA. ExportParameters(false), false);
string base64code = Convert.ToBase64String(encryptedData);
return base64code;
}
catch (Exception exc)
{
//Catch this exception in case the encryption did
//not succeed.
//Exceptions.LogException(exc);
Console.WriteLine(exc. Message);
return"";
}
}
staticprivatebyte[] RSAEncrypt(
byte[] DataToEncrypt,
RSAParameters RSAKeyInfo,
bool DoOAEPPadding)
{
try
{
//Create a new instance of RSACryptoServiceProvider.
RSACryptoServiceProvider RSA =new RSACryptoServiceProvider();
//Import the RSA Key information. This only needs
//toinclude the public key information.
RSA. ImportParameters(RSAKeyInfo);
//Encrypt the passed byte array and specify OAEP padding.
//OAEP padding is only available on Microsoft Windows XP or
//later.
return RSA. Encrypt(DataToEncrypt, DoOAEPPadding);
}
//Catch and display a CryptographicException
//to the console.
catch (CryptographicException e)
{
//Exceptions.LogException(e);
Console.WriteLine(e.Message);
returnnull;
}
}
staticprivatebyte[] RSADecrypt(
byte[] DataToDecrypt,
RSAParameters RSAKeyInfo,
bool DoOAEPPadding)
{
try
{
//Create a new instance of RSACryptoServiceProvider.
RSACryptoServiceProvider RSA =new RSACryptoServiceProvider();
//Import the RSA Key information. This needs
//to include the private key information.
RSA. ImportParameters(RSAKeyInfo);
//Decrypt the passed byte array and specify OAEP padding.
//OAEP padding is only available on Microsoft Windows XP or
//later.
return RSA. Decrypt(DataToDecrypt, DoOAEPPadding);
}
//Catch and display a CryptographicException
//to the console.
catch (CryptographicException e)
{
//Exceptions.LogException(e);
Console.WriteLine(e.Message);
returnnull;
}
}
}
}
- static void Main(string[] args)
- {
- string encodeString = MyRSA.Encrypt("1234567");
- Console.WriteLine(encodeString);
- string decode = MyRSA.Decrypt(encodeString);
- Console.WriteLine(decode);
- Console.ReadLine();
- }
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