C# 加密总结 一些常见的加密方法
一 散列数据 代码如下：
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private static string CalculateSHA512Hash(string input) { byte[] inputBytes = Encoding.UTF8.GetBytes(input); SHA512Managed sha512 = new SHA512Managed(); byte[] outputBytes = sha512.ComputeHash(inputBytes); return Convert.ToBase64String(outputBytes); }
原始散列对于彩虹表来说也存在漏洞，在彩虹表中，表内的每一条记录都是一串明文对应一种加密算法生成的一串密文。加盐就是指在密码中加入一个盐，这样可以提高密码散列的安全性。修改后的代码如下：
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private static string CalculateSHA512Hash(string input,string salt)
{ byte[] saltBytes = Convert.FromBase64String(salt);
byte[] inputBytes = Encoding.UTF8.GetBytes(input);
byte[] inputWithSaltBytes = new byte[saltBytes.Length + inputBytes.Length];
Array.Copy(inputBytes, 0, inputWithSaltBytes, 0, inputBytes.Length);
Array.Copy(saltBytes, 0, inputWithSaltBytes, inputBytes.Length, saltBytes.Length); SHA512Managed sha512 = new SHA512Managed();
byte[] outputBytes = sha512.ComputeHash(inputWithSaltBytes);
return Convert.ToBase64String(outputBytes);
} private static string GetSalt(int minSaltSize, int maxSaltSize)
{ Random random = new Random();
int saltSize = random.Next(minSaltSize, maxSaltSize);
byte[] saltBytes = new byte[saltSize];
RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();
rng.GetNonZeroBytes(saltBytes);
return Convert.ToBase64String(saltBytes);
}
二 对称加密
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private static string Encrypt(string input, byte[] key, byte[] iv)
{ byte[] inputBytes = Encoding.UTF8.GetBytes(input);
RijndaelManaged rijndael = new RijndaelManaged();
ICryptoTransform transform = rijndael.CreateEncryptor(key, iv);
byte[] encrytData = null;
using (MemoryStream outputStream = new MemoryStream())
{ using (CryptoStream inputStream = new CryptoStream(outputStream, transform, CryptoStreamMode.Write))
{ inputStream.Write(inputBytes, 0,
inputBytes.Length);
inputStream.FlushFinalBlock();
encrytData = outputStream.ToArray();
} } return Convert.ToBase64String(encrytData);
} private static string Decrypt(string input, byte[] key, byte[] iv)
{ byte[] inputBytes=Convert.FromBase64String(input);
RijndaelManaged rijndael = new RijndaelManaged();
ICryptoTransform transform = rijndael.CreateDecryptor(key, iv);
byte[] decryptByte;
using (MemoryStream outputStream=new MemoryStream())
{ using (CryptoStream inputStream=new CryptoStream(outputStream,transform,CryptoStreamMode.Write))
{ inputStream.Write(inputBytes, 0, inputBytes.Length);
inputStream.FlushFinalBlock();
decryptByte = outputStream.ToArray();
} } return Encoding.UTF8.GetString(decryptByte);
} private static void GetKeyAndIVFromPasswordAndSalt(string password, byte[] salt,
SymmetricAlgorithm symmetricAlgorithm,
ref byte[] key, ref byte[] iv)
{ Rfc2898DeriveBytes rfc2898DeriveBytes = new Rfc2898DeriveBytes(password, salt);
key = rfc2898DeriveBytes.GetBytes(symmetricAlgorithm.KeySize / 8);
iv = rfc2898DeriveBytes.GetBytes(symmetricAlgorithm.BlockSize / 8);
} private static string GetSalt(int minSaltSize, int maxSaltSize)
{ Random random = new Random();
int saltSize = random.Next(minSaltSize, maxSaltSize);
byte[] saltBytes = new byte[saltSize];
RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();
&nb
补充：综合编程 , 安全编程 ,
