C#实现AES加密解密(AES-128-CBC)
AES算法描述简介:
DES数据加密标准算法由于密钥长度较小(56位),已经不适应当今分布式开放网络对数据加密安全性的要求,因此1997年NIST公开征集新的数据加密标准,即AES。经过三轮的筛选,比利时Joan Daeman和Vincent Rijmen提交的Rijndael算法被提议为AES的最终算法。此算法将成为美国新的数据加密标准而被广泛应用在各个领域中。尽管人们对AES还有不同的看法,但总体来说,AES作为新一代的数据加密标准汇聚了强安全性、高性能、高效率、易用和灵活等优点。AES设计有三个密钥长度:128,192,256位,相对而言,AES的128密钥比DES的56密钥强1021倍。
1 using System.Security.Cryptography; 2 using System.IO; 3 4 class AESUtil 5 { 6 /// <summary> 7 /// AES加密 8 /// </summary> 9 /// <param name="Data">被加密的明文</param> 10 /// <param name="Key">密钥</param> 11 /// <param name="Vector">向量</param> 12 /// <returns>密文</returns> 13 public static Byte[] AESEncrypt(Byte[] Data, String Key, String Vector) 14 { 15 Byte[] bKey = new Byte[32]; 16 Array.Copy(Encoding.UTF8.GetBytes(Key.PadRight(bKey.Length)), bKey, bKey.Length); 17 Byte[] bVector = new Byte[16]; 18 Array.Copy(Encoding.UTF8.GetBytes(Vector.PadRight(bVector.Length)), bVector, bVector.Length); 19 20 Byte[] Cryptograph = null; // 加密后的密文 21 22 Rijndael Aes = Rijndael.Create(); 23 try 24 { 25 // 开辟一块内存流 26 using (MemoryStream Memory = new MemoryStream()) 27 { 28 // 把内存流对象包装成加密流对象 29 using (CryptoStream Encryptor = new CryptoStream(Memory, 30 Aes.CreateEncryptor(bKey, bVector), 31 CryptoStreamMode.Write)) 32 { 33 // 明文数据写入加密流 34 Encryptor.Write(Data, 0, Data.Length); 35 Encryptor.FlushFinalBlock(); 36 37 Cryptograph = Memory.ToArray(); 38 } 39 } 40 } 41 catch 42 { 43 Cryptograph = null; 44 } 45 46 return Cryptograph; 47 } 48 49 /// <summary> 50 /// AES解密 51 /// </summary> 52 /// <param name="Data">被解密的密文</param> 53 /// <param name="Key">密钥</param> 54 /// <param name="Vector">向量</param> 55 /// <returns>明文</returns> 56 public static Byte[] AESDecrypt(Byte[] Data, String Key, String Vector) 57 { 58 Byte[] bKey = new Byte[32]; 59 Array.Copy(Encoding.UTF8.GetBytes(Key.PadRight(bKey.Length)), bKey, bKey.Length); 60 Byte[] bVector = new Byte[16]; 61 Array.Copy(Encoding.UTF8.GetBytes(Vector.PadRight(bVector.Length)), bVector, bVector.Length); 62 63 Byte[] original = null; // 解密后的明文 64 65 Rijndael Aes = Rijndael.Create(); 66 try 67 { 68 // 开辟一块内存流,存储密文 69 using (MemoryStream Memory = new MemoryStream(Data)) 70 { 71 // 把内存流对象包装成加密流对象 72 using (CryptoStream Decryptor = new CryptoStream(Memory, 73 Aes.CreateDecryptor(bKey, bVector), 74 CryptoStreamMode.Read)) 75 { 76 // 明文存储区 77 using (MemoryStream originalMemory = new MemoryStream()) 78 { 79 Byte[] Buffer = new Byte[1024]; 80 Int32 readBytes = 0; 81 while ((readBytes = Decryptor.Read(Buffer, 0, Buffer.Length)) > 0) 82 { 83 originalMemory.Write(Buffer, 0, readBytes); 84 } 85 86 original = originalMemory.ToArray(); 87 } 88 } 89 } 90 } 91 catch 92 { 93 original = null; 94 } 95 96 return original; 97 } 98 }
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