如何在c#中加密和解密字符串?
当前回答
using System;
using System.Collections.Generic;
using System.Text;
using System.Text.RegularExpressions; // This is for password validation
using System.Security.Cryptography;
using System.Configuration; // This is where the hash functions reside
namespace BullyTracker.Common
{
public class HashEncryption
{
//public string GenerateHashvalue(string thisPassword)
//{
// MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
// byte[] tmpSource;
// byte[] tmpHash;
// tmpSource = ASCIIEncoding.ASCII.GetBytes(thisPassword); // Turn password into byte array
// tmpHash = md5.ComputeHash(tmpSource);
// StringBuilder sOutput = new StringBuilder(tmpHash.Length);
// for (int i = 0; i < tmpHash.Length; i++)
// {
// sOutput.Append(tmpHash[i].ToString("X2")); // X2 formats to hexadecimal
// }
// return sOutput.ToString();
//}
//public Boolean VerifyHashPassword(string thisPassword, string thisHash)
//{
// Boolean IsValid = false;
// string tmpHash = GenerateHashvalue(thisPassword); // Call the routine on user input
// if (tmpHash == thisHash) IsValid = true; // Compare to previously generated hash
// return IsValid;
//}
public string GenerateHashvalue(string toEncrypt, bool useHashing)
{
byte[] keyArray;
byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(toEncrypt);
System.Configuration.AppSettingsReader settingsReader = new AppSettingsReader();
// Get the key from config file
string key = (string)settingsReader.GetValue("SecurityKey", typeof(String));
//System.Windows.Forms.MessageBox.Show(key);
if (useHashing)
{
MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();
keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(key));
hashmd5.Clear();
}
else
keyArray = UTF8Encoding.UTF8.GetBytes(key);
TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
tdes.Key = keyArray;
tdes.Mode = CipherMode.ECB;
tdes.Padding = PaddingMode.PKCS7;
ICryptoTransform cTransform = tdes.CreateEncryptor();
byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
tdes.Clear();
return Convert.ToBase64String(resultArray, 0, resultArray.Length);
}
/// <summary>
/// DeCrypt a string using dual encryption method. Return a DeCrypted clear string
/// </summary>
/// <param name="cipherString">encrypted string</param>
/// <param name="useHashing">Did you use hashing to encrypt this data? pass true is yes</param>
/// <returns></returns>
public string Decrypt(string cipherString, bool useHashing)
{
byte[] keyArray;
byte[] toEncryptArray = Convert.FromBase64String(cipherString);
System.Configuration.AppSettingsReader settingsReader = new AppSettingsReader();
//Get your key from config file to open the lock!
string key = (string)settingsReader.GetValue("SecurityKey", typeof(String));
if (useHashing)
{
MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();
keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(key));
hashmd5.Clear();
}
else
keyArray = UTF8Encoding.UTF8.GetBytes(key);
TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
tdes.Key = keyArray;
tdes.Mode = CipherMode.ECB;
tdes.Padding = PaddingMode.PKCS7;
ICryptoTransform cTransform = tdes.CreateDecryptor();
byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
tdes.Clear();
return UTF8Encoding.UTF8.GetString(resultArray);
}
}
}
其他回答
这是一个简单的Snippet，最初由ASP Snippet编写
using System.Text;
using System.Security.Cryptography;
using System.IO;
private string Encrypt(string clearText)
{
string EncryptionKey = "yourkey";
byte[] clearBytes = Encoding.Unicode.GetBytes(clearText);
using (Aes encryptor = Aes.Create())
{
Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
encryptor.Key = pdb.GetBytes(32);
encryptor.IV = pdb.GetBytes(16);
using (MemoryStream ms = new MemoryStream())
{
using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateEncryptor(), CryptoStreamMode.Write))
{
cs.Write(clearBytes, 0, clearBytes.Length);
cs.Close();
}
clearText = Convert.ToBase64String(ms.ToArray());
}
}
return clearText;
}
private string Decrypt(string cipherText)
{
string EncryptionKey = "yourkey";
cipherText = cipherText.Replace(" ", "+");
byte[] cipherBytes = Convert.FromBase64String(cipherText);
using (Aes encryptor = Aes.Create())
{
Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
encryptor.Key = pdb.GetBytes(32);
encryptor.IV = pdb.GetBytes(16);
using (MemoryStream ms = new MemoryStream())
{
using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateDecryptor(), CryptoStreamMode.Write))
{
cs.Write(cipherBytes, 0, cipherBytes.Length);
cs.Close();
}
cipherText = Encoding.Unicode.GetString(ms.ToArray());
}
}
return cipherText;
}
用于AES-GCM加密的BouncyCastle的替代方案是libsodium-net。它包装了libsodium C库。一个很好的优点是它在cpu中使用AES-NI扩展进行非常快速的加密。缺点是，如果CPU没有扩展，它根本无法工作。软件没有退路。
using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;
public class Program
{
public static void Main()
{
var key = Encoding.UTF8.GetBytes("SUkbqO2ycDo7QwpR25kfgmC7f8CoyrZy");
var data = Encoding.UTF8.GetBytes("testData");
//Encrypt data
var encrypted = CryptoHelper.EncryptData(data,key);
//Decrypt data
var decrypted = CryptoHelper.DecryptData(encrypted,key);
//Display result
Console.WriteLine(Encoding.UTF8.GetString(decrypted));
}
}
public static class CryptoHelper
{
public static byte[] EncryptData(byte[] data, byte[] key)
{
using (var aesAlg = Aes.Create())
{
aesAlg.Mode = CipherMode.CBC;
using (var encryptor = aesAlg.CreateEncryptor(key, aesAlg.IV))
{
using (var msEncrypt = new MemoryStream())
{
msEncrypt.Write(aesAlg.IV, 0, aesAlg.IV.Length);
using (var csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
csEncrypt.Write(data, 0, data.Length);
return msEncrypt.ToArray();
}
}
}
}
public static byte[] DecryptData(byte[] encrypted, byte[] key)
{
var iv = new byte[16];
Buffer.BlockCopy(encrypted, 0, iv, 0, iv.Length);
using (var aesAlg = Aes.Create())
{
aesAlg.Mode = CipherMode.CBC;
using (var decryptor = aesAlg.CreateDecryptor(key, iv))
{
using (var msDecrypt = new MemoryStream(encrypted, iv.Length, encrypted.Length - iv.Length))
{
using (var csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
using (var resultStream = new MemoryStream())
{
csDecrypt.CopyTo(resultStream);
return resultStream.ToArray();
}
}
}
}
}
}
}
下面的代码是Ghazal回答类似问题的改进版本。
public class EncryptionHelper
{
private Aes aesEncryptor;
public EncryptionHelper()
{
}
private void BuildAesEncryptor(string key)
{
aesEncryptor = Aes.Create();
var pdb = new Rfc2898DeriveBytes(key, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
aesEncryptor.Key = pdb.GetBytes(32);
aesEncryptor.IV = pdb.GetBytes(16);
}
public string EncryptString(string clearText, string key)
{
BuildAesEncryptor(key);
var clearBytes = Encoding.Unicode.GetBytes(clearText);
using (var ms = new MemoryStream())
{
using (var cs = new CryptoStream(ms, aesEncryptor.CreateEncryptor(), CryptoStreamMode.Write))
{
cs.Write(clearBytes, 0, clearBytes.Length);
}
var encryptedText = Convert.ToBase64String(ms.ToArray());
return encryptedText;
}
}
public string DecryptString(string cipherText, string key)
{
BuildAesEncryptor(key);
cipherText = cipherText.Replace(" ", "+");
var cipherBytes = Convert.FromBase64String(cipherText);
using (var ms = new MemoryStream())
{
using (var cs = new CryptoStream(ms, aesEncryptor.CreateDecryptor(), CryptoStreamMode.Write))
{
cs.Write(cipherBytes, 0, cipherBytes.Length);
}
var clearText = Encoding.Unicode.GetString(ms.ToArray());
return clearText;
}
}
}
加密
public string EncryptString(string inputString)
{
MemoryStream memStream = null;
try
{
byte[] key = { };
byte[] IV = { 12, 21, 43, 17, 57, 35, 67, 27 };
string encryptKey = "aXb2uy4z"; // MUST be 8 characters
key = Encoding.UTF8.GetBytes(encryptKey);
byte[] byteInput = Encoding.UTF8.GetBytes(inputString);
DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
memStream = new MemoryStream();
ICryptoTransform transform = provider.CreateEncryptor(key, IV);
CryptoStream cryptoStream = new CryptoStream(memStream, transform, CryptoStreamMode.Write);
cryptoStream.Write(byteInput, 0, byteInput.Length);
cryptoStream.FlushFinalBlock();
}
catch (Exception ex)
{
Response.Write(ex.Message);
}
return Convert.ToBase64String(memStream.ToArray());
}
解密:
public string DecryptString(string inputString)
{
MemoryStream memStream = null;
try
{
byte[] key = { };
byte[] IV = { 12, 21, 43, 17, 57, 35, 67, 27 };
string encryptKey = "aXb2uy4z"; // MUST be 8 characters
key = Encoding.UTF8.GetBytes(encryptKey);
byte[] byteInput = new byte[inputString.Length];
byteInput = Convert.FromBase64String(inputString);
DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
memStream = new MemoryStream();
ICryptoTransform transform = provider.CreateDecryptor(key, IV);
CryptoStream cryptoStream = new CryptoStream(memStream, transform, CryptoStreamMode.Write);
cryptoStream.Write(byteInput, 0, byteInput.Length);
cryptoStream.FlushFinalBlock();
}
catch (Exception ex)
{
Response.Write(ex.Message);
}
Encoding encoding1 = Encoding.UTF8;
return encoding1.GetString(memStream.ToArray());
}
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