/// <summary>
/// 基本解密方法，输入输出类型为内部类型
/// </summary>
/// <param name="aesCipher"></param>
/// <param name="aesKey"></param>
/// <returns></returns>
static AES_Data_128 Decrypt(AES_Data_128 aesCipher, AES_Key_128 aesKey)
{
AES_Data_128 aesRes = new AES_Data_128(aesCipher);
List <WORD> AES_RoundKey = new List <WORD>();
AES_RoundKey.Add(aesKey.AES_Key[40]);
AES_RoundKey.Add(aesKey.AES_Key[41]);
AES_RoundKey.Add(aesKey.AES_Key[42]);
AES_RoundKey.Add(aesKey.AES_Key[43]);
aesRes += AES_RoundKey;
for (int round = 9; round > 0; --round)
{
aesRes.RowSwap_T();
aesRes.Swap_S_T();
AES_RoundKey.Clear();
AES_RoundKey.Add(aesKey.AES_Key[4 * round]);
AES_RoundKey.Add(aesKey.AES_Key[4 * round + 1]);
AES_RoundKey.Add(aesKey.AES_Key[4 * round + 2]);
AES_RoundKey.Add(aesKey.AES_Key[4 * round + 3]);
aesRes += AES_RoundKey;
aesRes.ColMix_T();
}
aesRes.RowSwap_T();
aesRes.Swap_S_T();
AES_RoundKey.Clear();
AES_RoundKey.Add(aesKey.AES_Key[0]);
AES_RoundKey.Add(aesKey.AES_Key[1]);
AES_RoundKey.Add(aesKey.AES_Key[2]);
AES_RoundKey.Add(aesKey.AES_Key[3]);
aesRes += AES_RoundKey;
return(aesRes);
}
/// <summary>
/// 对基本加密方法的封装，输入输出为byte数组
/// </summary>
/// <param name="baPlain"></param>
/// <param name="baKey"></param>
/// <returns></returns>
public static byte[] Encrypt(byte[] baPlain, byte[] baKey)
{
AES_Data_128 aesPlain = new AES_Data_128(baPlain);
AES_Key_128 aesKey = new AES_Key_128(baKey);
return(Encrypt(aesPlain, aesKey).GetBytes());
}
/// <summary>
/// 基本加密方法，输入输出类型为内部类型
/// </summary>
/// <param name="aesPlain"></param>
/// <param name="aesKey"></param>
/// <returns></returns>
static AES_Data_128 Encrypt(AES_Data_128 aesPlain, AES_Key_128 aesKey)
{
AES_Data_128 aesRes = new AES_Data_128(aesPlain);
List <WORD> AES_RoundKey = new List <WORD>();
AES_RoundKey.Add(aesKey.AES_Key[0]);
AES_RoundKey.Add(aesKey.AES_Key[1]);
AES_RoundKey.Add(aesKey.AES_Key[2]);
AES_RoundKey.Add(aesKey.AES_Key[3]);
aesRes += AES_RoundKey;
for (int round = 1; round < 10; ++round)
{
aesRes.Swap_S();
aesRes.RowSwap();
aesRes.ColMix();
AES_RoundKey.Clear();
AES_RoundKey.Add(aesKey.AES_Key[4 * round]);
AES_RoundKey.Add(aesKey.AES_Key[4 * round + 1]);
AES_RoundKey.Add(aesKey.AES_Key[4 * round + 2]);
AES_RoundKey.Add(aesKey.AES_Key[4 * round + 3]);
aesRes += AES_RoundKey;
}
aesRes.Swap_S();
aesRes.RowSwap();
AES_RoundKey.Clear();
AES_RoundKey.Add(aesKey.AES_Key[40]);
AES_RoundKey.Add(aesKey.AES_Key[41]);
AES_RoundKey.Add(aesKey.AES_Key[42]);
AES_RoundKey.Add(aesKey.AES_Key[43]);
aesRes += AES_RoundKey;
return(aesRes);
}
/// <summary>
/// 对基本解密方法的封装，输入输出为byte数组
/// </summary>
/// <param name="baCipher"></param>
/// <param name="baKey"></param>
/// <returns></returns>
public static byte[] Decrypt(byte[] baCipher, byte[] baKey)
{
AES_Data_128 aesPlain = new AES_Data_128(baCipher);
AES_Key_128 aesKey = new AES_Key_128(baKey);
return(Decrypt(aesPlain, aesKey).GetBytes());
}
/// <summary>
/// 分组解密方法
/// </summary>
/// <param name="baCipher"></param>
/// <param name="baKey"></param>
/// <param name="baIV"></param>
/// <param name="mode"></param>
/// <returns></returns>
public static byte[] DecryptBlock(byte[] baCipher, byte[] baKey, byte[] baIV, Mode mode)
{
List <byte> blPlain = new List <byte>();
ByteString bsCipher = new ByteString(baCipher);
AES_Key_128 aesKey = new AES_Key_128(baKey);
int part, rem, count;
switch (mode)
{
case Mode.ECB:
part = (int)Math.Ceiling(baCipher.Length / 16.0);
count = part;
rem = 16 - (baCipher.Length % 16);
bsCipher += new byte[rem];
while (count > 0)
{
AES_Data_128 aesToken = new AES_Data_128(bsCipher.SubString((part - count) * 16, 16).GetBytes());
blPlain.AddRange(Decrypt(aesToken, aesKey).GetBytes());
--count;
}
break;
case Mode.CBC:
part = (int)Math.Ceiling(baCipher.Length / 16.0);
count = part;
rem = 16 - (baCipher.Length % 16);
bsCipher += new byte[rem];
while (count > 0)
{
AES_Data_128 aesToken = new AES_Data_128(bsCipher.SubString((part - count) * 16, 16).GetBytes());
blPlain.AddRange((Decrypt(aesToken, aesKey) ^ baIV).GetBytes());
baIV = aesToken.GetBytes();
--count;
}
break;
case Mode.CFB:
throw new ModeNotSupportedException("CFB");
case Mode.OFB:
part = (int)Math.Ceiling(baCipher.Length / 16.0);
count = part;
rem = 16 - (baCipher.Length % 16);
bsCipher += new byte[rem];
while (count > 0)
{
AES_Data_128 aesToken = new AES_Data_128(baIV);
baIV = Encrypt(aesToken, aesKey).GetBytes();
blPlain.AddRange((bsCipher.SubString((part - count) * 16, 16) ^ baIV).GetBytes());
--count;
}
break;
case Mode.PCBC:
part = (int)Math.Ceiling(baCipher.Length / 16.0);
count = part;
rem = 16 - (baCipher.Length % 16);
bsCipher += new byte[rem];
while (count > 0)
{
ByteString bsCipherToken = bsCipher.SubString((part - count) * 16, 16);
AES_Data_128 aesToken = new AES_Data_128(bsCipherToken.GetBytes());
ByteString bsPlainToken = new ByteString((Decrypt(aesToken, aesKey) ^ baIV).GetBytes());
blPlain.AddRange(bsPlainToken.GetBytes());
baIV = (bsCipherToken ^ bsPlainToken).GetBytes();
--count;
}
break;
case Mode.CTR:
throw new ModeNotSupportedException("CTR");
default:
throw new ModeNotSupportedException("UNKNOWN");
}
return(blPlain.ToArray());
}
