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C#加密解密方法

發布時間：2025/3/20 C# 25 豆豆

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1、方法一 (不可逆加密)

public string EncryptPassword(string PasswordString,string PasswordFormat )?
?? {?
?? string? encryptPassword = null;
?? if (PasswordFormat="SHA1"){?
?? encryptPassword=FormsAuthortication.HashPasswordForStoringInConfigFile(PasswordString

,"SHA1");?
?? }?
?? elseif (PasswordFormat="MD5")?
?? { encryptPassword=FormsAuthortication.HashPasswordForStoringInConfigFile(PasswordString

,"MD5");?
?? }
return encryptPassword ;
}

2、方法二 (可逆加密)

??? public interface IBindesh
{
??? string encode(string str);
??? string decode(string str);
}

public class EncryptionDecryption : IBindesh
??? {
??????? public string encode(string str)
??????? {
??????????? string htext = "";

??????????? for ( int i = 0; i < str.Length; i++)
??????????? {
??????????????? htext = htext + (char) (str[i] + 10 - 1 * 2);
??????????? }
??????????? return htext;
??????? }

??????? public string decode(string str)
??????? {
??????????? string dtext = "";

??????????? for ( int i=0; i < str.Length; i++)
??????????? {
??????????????? dtext = dtext + (char) (str[i] - 10 + 1*2);
??????????? }
??????????? return dtext;
??????? }

3、方法三 (可逆加密)

????????
??????? const string KEY_64 = "VavicApp";//注意了，是8個字符，64位

??????? const string IV_64 = "VavicApp";?
public string Encode(string data)
??????? {
??????????? byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);
??????????? byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);

??????????? DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
??????????? int i = cryptoProvider.KeySize;
??????????? MemoryStream ms = new MemoryStream();
??????????? CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateEncryptor(byKey,

byIV), CryptoStreamMode.Write);

??????????? StreamWriter sw = new StreamWriter(cst);
??????????? sw.Write(data);
??????????? sw.Flush();
??????????? cst.FlushFinalBlock();
??????????? sw.Flush();
??????????? return Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length);

??????? }

??????? public string Decode(string data)
??????? {
??????????? byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);
??????????? byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);

??????????? byte[] byEnc;
??????????? try
??????????? {
??????????????? byEnc = Convert.FromBase64String(data);
??????????? }
??????????? catch
??????????? {
??????????????? return null;
??????????? }

??????????? DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
??????????? MemoryStream ms = new MemoryStream(byEnc);
??????????? CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateDecryptor(byKey,

byIV), CryptoStreamMode.Read);
??????????? StreamReader sr = new StreamReader(cst);
??????????? return sr.ReadToEnd();
??????? }

4、MD5不可逆加密

??? (32位加密)

public string GetMD5(string s, string _input_charset)
??? {

??????? /**//**//** <summary>
??????? /// 與ASP兼容的MD5加密算法
??????? /// </summary>

??????? MD5 md5 = new MD5CryptoServiceProvider();
??????? byte[] t = md5.ComputeHash(Encoding.GetEncoding(_input_charset).GetBytes(s));
??????? StringBuilder sb = new StringBuilder(32);
??????? for (int i = 0; i < t.Length; i++)
??????? {
??????????? sb.Append(t[i].ToString("x").PadLeft(2, ＇0＇));
??????? }
??????? return sb.ToString();
??? }
?? (16位加密)

public static string GetMd5Str(string ConvertString)
??? {
??????? MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
??????? string t2 =

BitConverter.ToString(md5.ComputeHash(UTF8Encoding.Default.GetBytes(ConvertString)), 4, 8);
??????? t2 = t2.Replace("-", "");
??????? return t2;
??? }

5、加解文本文件

??? //加密文件
??? private static void EncryptData(String inName, String outName, byte[] desKey, byte[]

desIV)
??? {
??????? //Create the file streams to handle the input and output files.
??????? FileStream fin = new FileStream(inName, FileMode.Open, FileAccess.Read);
??????? FileStream fout = new FileStream(outName, FileMode.OpenOrCreate, FileAccess.Write);
??????? fout.SetLength(0);

??????? //Create variables to help with read and write.
??????? byte[] bin = new byte[100]; //This is intermediate storage for the encryption.
??????? long rdlen = 0;????????????? //This is the total number of bytes written.
??????? long totlen = fin.Length;??? //This is the total length of the input file.
??????? int len;???????????????????? //This is the number of bytes to be written at a time.

??????? DES des = new DESCryptoServiceProvider();
??????? CryptoStream encStream = new CryptoStream(fout, des.CreateEncryptor(desKey, desIV),

CryptoStreamMode.Write);

??????? //Read from the input file, then encrypt and write to the output file.
??????? while (rdlen < totlen)
??????? {
??????????? len = fin.Read(bin, 0, 100);
??????????? encStream.Write(bin, 0, len);
??????????? rdlen = rdlen + len;
??????? }

??????? encStream.Close();
??????? fout.Close();
??????? fin.Close();
??? }

??? //解密文件
??? private static void DecryptData(String inName, String outName, byte[] desKey, byte[]

??????? DES des = new DESCryptoServiceProvider();
??????? CryptoStream encStream = new CryptoStream(fout, des.CreateDecryptor(desKey, desIV),

CryptoStreamMode.Write);

??????? encStream.Close();
??????? fout.Close();
??????? fin.Close();
??? }

6、

using System;
using System.Collections.Generic;
using System.Text;
using System.Security.Cryptography;
using System.IO;

namespace Component
{
??? public class Security
??? {
??????? public Security()
??????? {?
????????
??????? }

??????? //默認密鑰向量
??????? private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
??????? /**//**//**//**//**//**//** <summary>
??????? /// DES加密字符串
??????? /// </summary>
??????? /// <param name="encryptString">待加密的字符串</param>
??????? /// <param name="encryptKey">加密密鑰,要求為8位</param>
??????? /// <returns>加密成功返回加密后的字符串，失敗返回源串</returns>
??????? public static string EncryptDES(string encryptString, string encryptKey)
??????? {
??????????? try
??????????? {
??????????????? byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
??????????????? byte[] rgbIV = Keys;
??????????????? byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
??????????????? DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
??????????????? MemoryStream mStream = new MemoryStream();
??????????????? CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey,

rgbIV), CryptoStreamMode.Write);
??????????????? cStream.Write(inputByteArray, 0, inputByteArray.Length);
??????????????? cStream.FlushFinalBlock();
??????????????? return Convert.ToBase64String(mStream.ToArray());
??????????? }
??????????? catch
??????????? {
??????????????? return encryptString;
??????????? }
??????? }

??????? /**//**//**//**//**//**//** <summary>
??????? /// DES解密字符串
??????? /// </summary>
??????? /// <param name="decryptString">待解密的字符串</param>
??????? /// <param name="decryptKey">解密密鑰,要求為8位,和加密密鑰相同</param>
??????? /// <returns>解密成功返回解密后的字符串，失敗返源串</returns>
??????? public static string DecryptDES(string decryptString, string decryptKey)
??????? {
??????????? try
??????????? {
??????????????? byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
??????????????? byte[] rgbIV = Keys;
??????????????? byte[] inputByteArray = Convert.FromBase64String(decryptString);
??????????????? DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
??????????????? MemoryStream mStream = new MemoryStream();
??????????????? CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey,

rgbIV), CryptoStreamMode.Write);
??????????????? cStream.Write(inputByteArray, 0, inputByteArray.Length);
??????????????? cStream.FlushFinalBlock();
??????????????? return Encoding.UTF8.GetString(mStream.ToArray());
??????????? }
??????????? catch
??????????? {
??????????????? return decryptString;
??????????? }
??????? }

??? }
}

轉載于:https://www.cnblogs.com/cyxcw1/archive/2010/10/25/3051317.html

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