C#中使用DES和AES加密解密
C#中使用DES和AES加密解密
2008-01-12 09:37
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using System;
using System.Text; using System.Security.Cryptography; using System.IO; namespace MyCryptography { /// <summary> /// DES加密解密 /// </summary> public class DES { /// <summary> /// 获取密钥 /// </summary> private static string Key { get { return @"P@+#wG+Z"; } } /// <summary> /// 获取向量 /// </summary> private static string IV { get { return @"L%n67}G/Mk@k%:~Y"; } } /// <summary> /// DES加密 /// </summary> /// <param name="plainStr">明文字符串</param> /// <returns>密文</returns> public static string DESEncrypt(string plainStr) { byte[] bKey = Encoding.UTF8.GetBytes(Key); byte[] bIV = Encoding.UTF8.GetBytes(IV); byte[] byteArray = Encoding.UTF8.GetBytes(plainStr); string encrypt = null; DESCryptoServiceProvider des = new DESCryptoServiceProvider(); try { using (MemoryStream mStream = new MemoryStream()) { using (CryptoStream cStream = new CryptoStream(mStream, des.CreateEncryptor(bKey, bIV), CryptoStreamMode.Write)) { cStream.Write(byteArray, 0, byteArray.Length); cStream.FlushFinalBlock(); encrypt = Convert.ToBase64String(mStream.ToArray()); } } } catch { } des.Clear(); return encrypt; } /// <summary> /// DES解密 /// </summary> /// <param name="encryptStr">密文字符串</param> /// <returns>明文</returns> public static string DESDecrypt(string encryptStr) { byte[] bKey = Encoding.UTF8.GetBytes(Key); byte[] bIV = Encoding.UTF8.GetBytes(IV); byte[] byteArray = Convert.FromBase64String(encryptStr); string decrypt = null; DESCryptoServiceProvider des = new DESCryptoServiceProvider(); try { using (MemoryStream mStream = new MemoryStream()) { using (CryptoStream cStream = new CryptoStream(mStream, des.CreateDecryptor(bKey, bIV), CryptoStreamMode.Write)) { cStream.Write(byteArray, 0, byteArray.Length); cStream.FlushFinalBlock(); decrypt = Encoding.UTF8.GetString(mStream.ToArray()); } } } catch { } des.Clear(); return decrypt; } } /// <summary> /// AES加密解密 /// </summary> public class AES { /// <summary> /// 获取密钥 /// </summary> private static string Key { get { return @")O[NB]6,YF}+efcaj{+oESb9d8>Z'e9M"; } } /// <summary> /// 获取向量 /// </summary> private static string IV { get { return @"L+/~f4,Ir)b$=pkf"; } } /// <summary> /// AES加密 /// </summary> /// <param name="plainStr">明文字符串</param> /// <returns>密文</returns> public static string AESEncrypt(string plainStr) { byte[] bKey = Encoding.UTF8.GetBytes(Key); byte[] bIV = Encoding.UTF8.GetBytes(IV); byte[] byteArray = Encoding.UTF8.GetBytes(plainStr); string encrypt = null; Rijndael aes = Rijndael.Create(); try { using (MemoryStream mStream = new MemoryStream()) { using (CryptoStream cStream = new CryptoStream(mStream, aes.CreateEncryptor(bKey, bIV), CryptoStreamMode.Write)) { cStream.Write(byteArray, 0, byteArray.Length); cStream.FlushFinalBlock(); encrypt = Convert.ToBase64String(mStream.ToArray()); } } } catch { } aes.Clear(); return encrypt; } /// <summary> /// AES加密 /// </summary> /// <param name="plainStr">明文字符串</param> /// <param name="returnNull">加密失败时是否返回 null，false 返回 String.Empty</param> /// <returns>密文</returns> public static string AESEncrypt(string plainStr, bool returnNull) { string encrypt = AESEncrypt(plainStr); return returnNull ? encrypt : (encrypt == null ? String.Empty : encrypt); } /// <summary> /// AES解密 /// </summary> /// <param name="encryptStr">密文字符串</param> /// <returns>明文</returns> public static string AESDecrypt(string encryptStr) { byte[] bKey = Encoding.UTF8.GetBytes(Key); byte[] bIV = Encoding.UTF8.GetBytes(IV); byte[] byteArray = Convert.FromBase64String(encryptStr); string decrypt = null; Rijndael aes = Rijndael.Create(); try { using (MemoryStream mStream = new MemoryStream()) { using (CryptoStream cStream = new CryptoStream(mStream, aes.CreateDecryptor(bKey, bIV), CryptoStreamMode.Write)) { cStream.Write(byteArray, 0, byteArray.Length); cStream.FlushFinalBlock(); decrypt = Encoding.UTF8.GetString(mStream.ToArray()); } } } catch { } aes.Clear(); return decrypt; } /// <summary> /// AES解密 /// </summary> /// <param name="encryptStr">密文字符串</param> /// <param name="returnNull">解密失败时是否返回 null，false 返回 String.Empty</param> /// <returns>明文</returns> public static string AESDecrypt(string encryptStr, bool returnNull) { string decrypt = AESDecrypt(encryptStr); return returnNull ? decrypt : (decrypt == null ? String.Empty : decrypt); } } } |