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基于RSA的加密/解密示例C#代码
在C#程序中,大家可能比较熟悉的方式是md5加密解密方式,对RSA可能并不是很熟悉, 下面就说一下RSA加密和解密的算法:
using System;
using System.Security.Cryptography;
using System.Text;
class RSACSPSample
{
static void Main()
{
try
{
string str_Plain_Text = "How are you?How are you?How are you?How are you?=-popopolA";
Console.WriteLine("明文:" + str_Plain_Text);
Console.WriteLine("长度:" + str_Plain_Text.Length.ToString());
Console.WriteLine();
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
string str_Public_Key;
string str_Private_Key;
string str_Cypher_Text = RSA_Encrypt(str_Plain_Text, out str_Public_Key,out str_Private_Key);
Console.WriteLine("密文:" + str_Cypher_Text);
Console.WriteLine("公钥:" + str_Public_Key);
Console.WriteLine("私钥:" + str_Private_Key);
string str_Plain_Text2 = RSA_Decrypt(str_Cypher_Text, str_Private_Key);
Console.WriteLine("解密:" + str_Plain_Text2);
Console.WriteLine();
}
catch (ArgumentNullException)
{
Console.WriteLine("Encryption failed.");
}
}
//RSA加密,随机生成公私钥对并作为出参返回
static public string RSA_Encrypt(string str_Plain_Text, out string str_Public_Key, out string str_Private_Key)
{
str_Public_Key = "";
str_Private_Key = "";
UnicodeEncoding ByteConverter = new UnicodeEncoding();
byte[] DataToEncrypt = ByteConverter.GetBytes(str_Plain_Text);
try
{
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
str_Public_Key = Convert.ToBase64String(RSA.ExportCspBlob(false));
str_Private_Key = Convert.ToBase64String(RSA.ExportCspBlob(true));
//OAEP padding is only available on Microsoft Windows XP or later.
byte[] bytes_Cypher_Text = RSA.Encrypt(DataToEncrypt, false);
str_Public_Key = Convert.ToBase64String(RSA.ExportCspBlob(false));
str_Private_Key = Convert.ToBase64String(RSA.ExportCspBlob(true));
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
static public string RSA_Decrypt(string str_Cypher_Text, string str_Private_Key)
{
byte[] DataToDecrypt = Convert.FromBase64String(str_Cypher_Text);
try
{
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
//RSA.ImportParameters(RSAKeyInfo);
byte[] bytes_Public_Key = Convert.FromBase64String(str_Private_Key);
RSA.ImportCspBlob(bytes_Public_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;
}
}
using System.Security.Cryptography;
using System.Text;
class RSACSPSample
{
static void Main()
{
try
{
string str_Plain_Text = "How are you?How are you?How are you?How are you?=-popopolA";
Console.WriteLine("明文:" + str_Plain_Text);
Console.WriteLine("长度:" + str_Plain_Text.Length.ToString());
Console.WriteLine();
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
string str_Public_Key;
string str_Private_Key;
string str_Cypher_Text = RSA_Encrypt(str_Plain_Text, out str_Public_Key,out str_Private_Key);
Console.WriteLine("密文:" + str_Cypher_Text);
Console.WriteLine("公钥:" + str_Public_Key);
Console.WriteLine("私钥:" + str_Private_Key);
string str_Plain_Text2 = RSA_Decrypt(str_Cypher_Text, str_Private_Key);
Console.WriteLine("解密:" + str_Plain_Text2);
Console.WriteLine();
}
catch (ArgumentNullException)
{
Console.WriteLine("Encryption failed.");
}
}
//RSA加密,随机生成公私钥对并作为出参返回
static public string RSA_Encrypt(string str_Plain_Text, out string str_Public_Key, out string str_Private_Key)
{
str_Public_Key = "";
str_Private_Key = "";
UnicodeEncoding ByteConverter = new UnicodeEncoding();
byte[] DataToEncrypt = ByteConverter.GetBytes(str_Plain_Text);
try
{
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
str_Public_Key = Convert.ToBase64String(RSA.ExportCspBlob(false));
str_Private_Key = Convert.ToBase64String(RSA.ExportCspBlob(true));
//OAEP padding is only available on Microsoft Windows XP or later.
byte[] bytes_Cypher_Text = RSA.Encrypt(DataToEncrypt, false);
str_Public_Key = Convert.ToBase64String(RSA.ExportCspBlob(false));
str_Private_Key = Convert.ToBase64String(RSA.ExportCspBlob(true));
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
static public string RSA_Decrypt(string str_Cypher_Text, string str_Private_Key)
{
byte[] DataToDecrypt = Convert.FromBase64String(str_Cypher_Text);
try
{
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
//RSA.ImportParameters(RSAKeyInfo);
byte[] bytes_Public_Key = Convert.FromBase64String(str_Private_Key);
RSA.ImportCspBlob(bytes_Public_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;
}
}
}
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