RSA generates public and private keys, as well as encryption and decryption

Little scum · Posted on 12/11/2015 10:12:29 AM

public static class RSACryptoProvider
{
/// <summary>
/// RSA解密
/// </summary>
/// <param name="base64code">需要进行解密的密文字符串</param>
/// <param name="privateKey">私钥</param>
/// <returns>解密后的明文</returns>
public static string Decrypt(string base64code, string privateKey)
{
UnicodeEncoding ByteConverter = new UnicodeEncoding();
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
RSA.FromXmlString(privateKey);
byte[] encryptedData;
byte[] decryptedData;
encryptedData = Convert.FromBase64String(base64code);
decryptedData = RSADecrypt(encryptedData, RSA.ExportParameters(true), false);
return ByteConverter.GetString(decryptedData);
}
/// <summary>
/// RSA分段解密;用于对超长字符串解密
/// </summary>
/// <param name="toEncryptString">需要进行解密的字符串</param>
/// <param name="publickKey">私钥</param>
/// <returns>解密后的明文</returns>
public static string SectionDecrypt(string base64code, string privateKey)
{
UnicodeEncoding ByteConverter = new UnicodeEncoding();
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
RSA.FromXmlString(privateKey);
Byte[] CiphertextData = Convert.FromBase64String(base64code);
int MaxBlockSize = RSA.KeySize / 8;
if (CiphertextData.Length <= MaxBlockSize)
{
byte[] decryptedData;
decryptedData = RSADecrypt(CiphertextData, RSA.ExportParameters(true), false);
return ByteConverter.GetString(decryptedData);
}
MemoryStream CrypStream = new MemoryStream(CiphertextData);
MemoryStream PlaiStream = new MemoryStream();
Byte[] Buffer = new Byte[MaxBlockSize];
int BlockSize = CrypStream.Read(Buffer, 0, MaxBlockSize);
while (BlockSize > 0)
{
Byte[] ToDecrypt = new Byte[BlockSize];
Array.Copy(Buffer, 0, ToDecrypt, 0, BlockSize);
Byte[] Plaintext = RSADecrypt(ToDecrypt, RSA.ExportParameters(true), false);
PlaiStream.Write(Plaintext, 0, Plaintext.Length);
BlockSize = CrypStream.Read(Buffer, 0, MaxBlockSize);
}
return ByteConverter.GetString(PlaiStream.ToArray());
}
/// <summary>
/// RSA加密
/// </summary>
/// <param name="toEncryptString">需要进行加密的字符串</param>
/// <param name="publicKey">公钥</param>
/// <returns>加密后的密文</returns>
public static string Encrypt(string toEncryptString, string publicKey)
{
UnicodeEncoding ByteConverter = new UnicodeEncoding();
byte[] dataToEncrypt = ByteConverter.GetBytes(toEncryptString);
byte[] encrytedData;
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
RSA.FromXmlString(publicKey);
encrytedData = RSAEncrypt(dataToEncrypt, RSA.ExportParameters(false), false);
string base64code = Convert.ToBase64String(encrytedData);
return base64code;
}
/// <summary>
/// RSA分段加密;用于对超长字符串加密
/// </summary>
/// <param name="toEncryptString">需要进行加密的字符串</param>
/// <param name="publickKey">公钥</param>
/// <returns>加密后的密文</returns>
public static string SectionEncrypt(string toEncryptString, string publickKey)
{
string base64code = string.Empty;
UnicodeEncoding ByteConverter = new UnicodeEncoding();
byte[] dataToEncrypt = ByteConverter.GetBytes(toEncryptString);
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
RSA.FromXmlString(publickKey);
int MaxBlockSize = RSA.KeySize / 8 - 11;
if (dataToEncrypt.Length <= MaxBlockSize)
{
byte[] encrytedData;
encrytedData = RSAEncrypt(dataToEncrypt, RSA.ExportParameters(false), false);
base64code = Convert.ToBase64String(encrytedData);
return base64code;
}
MemoryStream plaiStream = new MemoryStream(dataToEncrypt);
MemoryStream CrypStream = new MemoryStream();
Byte[] Buffer = new Byte[MaxBlockSize];
int BlockSize = plaiStream.Read(Buffer, 0, MaxBlockSize);
while (BlockSize > 0)
{
Byte[] ToEncrypt = new Byte[BlockSize];
Array.Copy(Buffer, 0, ToEncrypt, 0, BlockSize);
Byte[] Cryptograph = RSAEncrypt(ToEncrypt, RSA.ExportParameters(false), false);
CrypStream.Write(Cryptograph, 0, Cryptograph.Length);
BlockSize = plaiStream.Read(Buffer, 0, MaxBlockSize);
}
base64code = Convert.ToBase64String(CrypStream.ToArray(), Base64FormattingOptions.None);
return base64code;
}
/// <summary>
/// RSA生成公钥和私钥
/// </summary>
/// <returns></returns>
public static string[] GenerateKeys()
{
try
{
string[] sKeys = new String[2];
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
sKeys[0] = rsa.ToXmlString(true);
sKeys[1] = rsa.ToXmlString(false);
return sKeys;
}
catch (Exception)
{
return null;
}
}　
private static byte[] RSAEncrypt(byte[] DataToEncrypt, RSAParameters RSAKeyInfo, bool DoOAEPPadding)
{
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
RSA.ImportParameters(RSAKeyInfo);
return RSA.Encrypt(DataToEncrypt, DoOAEPPadding);
}
private static byte[] RSADecrypt(byte[] DataToDecrypt, RSAParameters RSAKeyInfo, bool DoOAEPPadding)
{
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
RSA.ImportParameters(RSAKeyInfo);
return RSA.Decrypt(DataToDecrypt, DoOAEPPadding);
}
}

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summer · Posted on 12/11/2015 10:51:32 AM

xiaoweier · Posted on 12/11/2015 11:22:50 AM

Are you also engaged in this encryption and decryption algorithm now? After learning C, I will start working on that algorithm. Can you give me some guidance?

Little scum · Posted on 12/11/2015 11:40:32 AM

xiaoweier posted on 2015-12-11 11:22
Are you also engaged in this encryption and decryption algorithm now? After learning C, I will start working on that algorithm. Can you give me some guidance?

Let's look at the example first:

On the code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace WebSite1.Security
{
public struct RSA_Keys
{
public const string Public = "<RSAKeyValue><Modulus>mcqqC6vyZSach3/PpaG+HlgI05Pu3OXX37DiLDi2wWltpcCwF3Z52dZmcrKKIwwTD0q58i46u9hiBr6VdsOU2UQEozvX5cM9gJ4EUUxq0K5PhLoRWfrCUQ1/i8d5cJ1D6a7jSJhXar4U8mM2ERiYymBfUn8zERE9qebxqwPCr0E=</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>";
public const string Private = "<RSAKeyValue><Modulus>mcqqC6vyZSach3/PpaG+HlgI05Pu3OXX37DiLDi2wWltpcCwF3Z52dZmcrKKIwwTD0q58i46u9hiBr6VdsOU2UQEozvX5cM9gJ4EUUxq0K5PhLoRWfrCUQ1/i8d5cJ1D6a7jSJhXar4U8mM2ERiYymBfUn8zERE9qebxqwPCr0E=</Modulus><Exponent>AQAB</Exponent><P>08NgiedL36cKVuTfNdNbtbe8OjUElcPfSQ/PZaTHkum8+aeu44Pb3XIFF4YEetRdJpbwvopb7J0sS8elR28EXQ==</P><Q>uesZTcA7e8PrPzHsROWZOnFwu+vw41yqZenUAo5R0mvCzAe23QjTM+AXSuNihEtfA0KoIuneucWY/xXLj/VoNQ==</Q><DP>vk+uKQFXbO5gGmuiNmt21j8DyIPxVO8tcinlSAHo4h1yGiQaxpmwNLnN3bAxwnmsJYwtW/BYYLN4JbqMzT/2eQ==</DP><DQ>VGYkk4Y7uqCjD4ojPteX6s8KpVSjgyNS+3bd1tcyz7o5sROjcM4LytXk3QtCctogZMOCvm66vEy2er4zLcPzLQ==</DQ><InverseQ>o5MLJDmubOgGWBDpPY0r80cGDFJ0r8hLLZ8vFlVkkhNkSMuoszM0RgoIPAn/R3YsD8rIxH3CldhfPuMuXljaLg==</InverseQ><D>foCqJzelB3cfQoXrs/67eBJKEF+bF7EoRSQmpuFv0uB6BOHe9y3JRVqKosYhwnpoIygAlClavrFa0Nlr8GkowdeGQD3dW4pjMWGwC2dVub9Lot3Vm5bWEDy8QUw9e/jR7+SXfXyrknylN4sozrJtVTeb//a1x4HV1D5elQtx7cE=</D></RSAKeyValue>";
}
}

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace WebSite1.Security
{
/// <summary>
/// MD5加密
/// </summary>
public class MD5CryptoProvider
{
public static string Encrypt(string text)
{
return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(text, "MD5");
}
}
}

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using WebSite1.Security;
namespace WebSite1
{
public partial class _Default : Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btntiao_Click(object sender, EventArgs e)
{
string tid = "test";
string rsa = RSACryptoProvider.SectionEncrypt(MD5CryptoProvider.Encrypt(tid.ToUpper()), RSA_Keys.Public);
Response.Redirect("About.aspx?tid=" + tid + "&sign=" + Uri.EscapeDataString(rsa));
}
}
}

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using WebSite1.Security;
namespace WebSite1
{
public partial class About : Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
string tid=Request.QueryString["tid"];
string rsa = Request.QueryString["sign"];
if (MD5CryptoProvider.Encrypt(tid.ToUpper()) == RSACryptoProvider.SectionDecrypt(rsa, RSA_Keys.Private))
{
Response.Write("成功!中途没有被修改!");
}
else {
Response.Write("失败!中途被修改过了!");
}
}
}
}
}

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This one is not given a full score?????

Little scum · Posted on 12/11/2015 11:42:55 AM

Summer Posted on 2015-12-11 10:51

Top wool thread look at the 4th floor

xiaoweier · Posted on 12/11/2015 11:44:33 AM

Xiao Zhazha Posted on 2015-12-11 11:40
Let's look at the example first:

I don't understand what you're doing above.

summer · Posted on 12/11/2015 2:07:00 PM

Xiao Zhazha Posted on 2015-12-11 11:42
Top wool thread look at the 4th floor

Little scum · Posted on 6/1/2023 8:51:19 PM

c# RSA encryption decryption Segmented encryption and segmented decryption
https://www.itsvse.com/thread-2779-1-1.html

[Source] RSA generates public and private keys, as well as encryption and decryption

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