public SymmetricCrypto(string key, byte[] iv, SymmetricFlag flag, Encoding encoding)
{
if (string.IsNullOrEmpty(key))
{
throw new ArgumentNullException("key");
}
if (iv == null)
{
throw new ArgumentNullException("iv");
}
Key = key;
IV = iv;
Encoding = encoding;
switch (flag)
{
case SymmetricFlag.Rijndael:
AlgorithmName = "Rijndael";
break;
case SymmetricFlag.TripleDES:
AlgorithmName = "TripleDES";
break;
case SymmetricFlag.RC2:
AlgorithmName = "RC2";
break;
case SymmetricFlag.DES:
AlgorithmName = "DES";
break;
}
}
private static byte[] GetDefaultIV(SymmetricFlag flag)
{
switch (flag)
{
case SymmetricFlag.Rijndael:
return(new byte[] { 0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef, 0xef, 0xcd, 0xab, 0x90, 0x78, 0x56, 0x34, 0x12 });
case SymmetricFlag.TripleDES:
return(new byte[] { 0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef });
case SymmetricFlag.RC2:
return(new byte[] { 0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef });
case SymmetricFlag.DES:
return(new byte[] { 0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef });
}
throw new NotSupportedException(string.Format("不支持{0}自动匹配向量。", flag));
}
/// <summary>
/// 对称加密
/// </summary>
/// <param name="key"></param>
/// <param name="iv"></param>
/// <param name="flag"></param>
/// <returns></returns>
public static ISymmetricCrypto SymmetricCrypto(string key, byte[] iv, SymmetricFlag flag)
{
return(new SymmetricCrypto(key, iv, flag));
}
public SymmetricCrypto(string key, byte[] iv, SymmetricFlag flag)
: this(key, iv, flag, CryptographySettings.Encoding)
{
}
public SymmetricCrypto(string key, SymmetricFlag flag)
: this(key, GetDefaultIV(flag), flag)
{
}