/* 基于RSA的数字签名和验证C#源码
* (采用字符串作为参数)RSA_Demo3
*
* 夏春涛 Email:xChuntao@163.com
* Blog:http://bluesky521.cnblogs.com
* 运行环境:.net2.0 framework
*/
/* 备注:
* 若要使用公钥系统对消息进行数字签名,发送方先向该消息应用哈希函数以创建消息摘要。
* 然后,发送方用自己的私钥对消息摘要进行加密,以创建发送方的个人签名。在收到消息和
* 签名后,接收方使用发送方的公钥解密该签名,以恢复消息摘要,并使用发送方所用的同一
* 哈希算法对该消息进行哈希运算。如果接收方计算的消息摘要与从发送方收到的消息摘要完
* 全匹配,则接收方可以假定消息在传输中未被更改。请注意,因为发送方的公钥是公共知识,
* 所以任何人都可以验证签名。
*/
using System;
using System.Security.Cryptography;
using System.Text;
class RSACSPSample
{
static void Main()
{
try
{
string str_DataToSign = @"Data to Sign!Data to Sign!Data to Sign!";
Console.WriteLine("原文:" + str_DataToSign);
Console.WriteLine("长度:" + str_DataToSign.Length.ToString());
Console.WriteLine();
RSACryptoServiceProvider RSAalg = new RSACryptoServiceProvider();
string str_Private_Key = Convert.ToBase64String( RSAalg.ExportCspBlob(true) );
string str_Public_Key = Convert.ToBase64String( RSAalg.ExportCspBlob(false) );
Console.WriteLine("公钥:" + str_Public_Key);
Console.WriteLine();
Console.WriteLine("私钥:" + str_Private_Key);
Console.WriteLine();
string str_SignedData = HashAndSign(str_DataToSign, str_Private_Key);// Hash and sign the data.
Console.WriteLine("签名数据:" + str_SignedData);
Console.WriteLine();
if (VerifySignedHash(str_DataToSign, str_SignedData, str_Public_Key))
{
Console.WriteLine("验证签名OK.");
}
else
{
Console.WriteLine("签名不匹配!");
}
Console.WriteLine();
}
catch (ArgumentNullException)
{
Console.WriteLine("The data was not signed or verified");
}
}
//对数据签名
public static string HashAndSign(string str_DataToSign, string str_Private_Key)
{
ASCIIEncoding ByteConverter = new ASCIIEncoding();
byte[] DataToSign = ByteConverter.GetBytes(str_DataToSign);
try
{
RSACryptoServiceProvider RSAalg = new RSACryptoServiceProvider();
RSAalg.ImportCspBlob( Convert.FromBase64String(str_Private_Key) );
byte[] signedData = RSAalg.SignData(DataToSign, new SHA1CryptoServiceProvider());
string str_SignedData = Convert.ToBase64String(signedData);
return str_SignedData;
}
catch (CryptographicException e)
{
Console.WriteLine(e.Message);
return null;
}
}
//验证签名
public static bool VerifySignedHash(string str_DataToVerify, string str_SignedData, string str_Public_Key)
{
byte[] SignedData = Convert.FromBase64String(str_SignedData);
ASCIIEncoding ByteConverter = new ASCIIEncoding();
byte[] DataToVerify = ByteConverter.GetBytes(str_DataToVerify);
try
{
RSACryptoServiceProvider RSAalg = new RSACryptoServiceProvider();
RSAalg.ImportCspBlob( Convert.FromBase64String(str_Public_Key) );
return RSAalg.VerifyData(DataToVerify, new SHA1CryptoServiceProvider(), SignedData);
}
catch (CryptographicException e)
{
Console.WriteLine(e.Message);
return false;
}
}
}