1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 | using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Security.Cryptography; using System.IO; namespace AESDemo { public static class AESHelper { /// <summary> /// AES加密 /// </summary> /// <param name="Data">被加密的明文</param> /// <param name="Key">密钥</param> /// <param name="Vector">向量</param> /// <returns>密文</returns> public static Byte[] AESEncrypt(Byte[] Data, String Key, String Vector) { Byte[] bKey = new Byte[32]; Array.Copy(Encoding.UTF8.GetBytes(Key.PadRight(bKey.Length)), bKey, bKey.Length); Byte[] bVector = new Byte[16]; Array.Copy(Encoding.UTF8.GetBytes(Vector.PadRight(bVector.Length)), bVector, bVector.Length); Byte[] Cryptograph = null; // 加密后的密文 Rijndael Aes = Rijndael.Create(); try { // 开辟一块内存流 using (MemoryStream Memory = new MemoryStream()) { // 把内存流对象包装成加密流对象 using (CryptoStream Encryptor = new CryptoStream(Memory, Aes.CreateEncryptor(bKey, bVector), CryptoStreamMode.Write)) { // 明文数据写入加密流 Encryptor.Write(Data, 0, Data.Length); Encryptor.FlushFinalBlock(); Cryptograph = Memory.ToArray(); } } } catch { Cryptograph = null; } return Cryptograph; } /// <summary> /// AES解密 /// </summary> /// <param name="Data">被解密的密文</param> /// <param name="Key">密钥</param> /// <param name="Vector">向量</param> /// <returns>明文</returns> public static Byte[] AESDecrypt(Byte[] Data, String Key, String Vector) { Byte[] bKey = new Byte[32]; Array.Copy(Encoding.UTF8.GetBytes(Key.PadRight(bKey.Length)), bKey, bKey.Length); Byte[] bVector = new Byte[16]; Array.Copy(Encoding.UTF8.GetBytes(Vector.PadRight(bVector.Length)), bVector, bVector.Length); Byte[] original = null; // 解密后的明文 Rijndael Aes = Rijndael.Create(); try { // 开辟一块内存流，存储密文 using (MemoryStream Memory = new MemoryStream(Data)) { // 把内存流对象包装成加密流对象 using (CryptoStream Decryptor = new CryptoStream(Memory, Aes.CreateDecryptor(bKey, bVector), CryptoStreamMode.Read)) { // 明文存储区 using (MemoryStream originalMemory = new MemoryStream()) { Byte[] Buffer = new Byte[1024]; Int32 readBytes = 0; while ((readBytes = Decryptor.Read(Buffer, 0, Buffer.Length)) > 0) { originalMemory.Write(Buffer, 0, readBytes); } original = originalMemory.ToArray(); } } } } catch { original = null; } return original; } } } 不使用向量的方式： public static class AESCrypto { /// <summary> /// IV向量为固定值 /// </summary> //private static byte[] _iV = { // 85, 60, 12, 116, // 99, 189, 173, 19, // 138, 183, 232, 248, // 82, 232, 200, 242 //}; public static byte[] Decrypt(byte[] encryptedBytes, byte[] key) { MemoryStream mStream = new MemoryStream( encryptedBytes ); //mStream.Write( encryptedBytes, 0, encryptedBytes.Length ); //mStream.Seek( 0, SeekOrigin.Begin ); RijndaelManaged aes = new RijndaelManaged( ); aes.Mode = CipherMode.ECB; aes.Padding = PaddingMode.PKCS7; aes.KeySize = 128; aes.Key = key; //aes.IV = _iV; CryptoStream cryptoStream = new CryptoStream( mStream, aes.CreateDecryptor( ), CryptoStreamMode.Read ); try { byte[] tmp = new byte[ encryptedBytes.Length + 32 ]; int len = cryptoStream.Read( tmp, 0, encryptedBytes.Length + 32 ); byte[] ret = new byte[ len ]; Array.Copy( tmp, 0, ret, 0, len ); return ret; } finally { cryptoStream.Close( ); mStream.Close( ); aes.Clear( ); } } public static byte[] Encrypt(byte[] plainBytes, byte[] key) { MemoryStream mStream = new MemoryStream(); RijndaelManaged aes = new RijndaelManaged(); aes.Mode = CipherMode.ECB; aes.Padding = PaddingMode.PKCS7; aes.KeySize = 128; //aes.Key = _key; aes.Key = key; //aes.IV = _iV; CryptoStream cryptoStream = new CryptoStream(mStream, aes.CreateEncryptor(), CryptoStreamMode.Write); try { cryptoStream.Write(plainBytes, 0, plainBytes.Length); cryptoStream.FlushFinalBlock(); return mStream.ToArray(); } finally { cryptoStream.Close(); mStream.Close(); aes.Clear(); } } } |
