public static byte[] ElectronicCodebookModeDecrypt(byte[] ciphertext, byte[] key)
{
List <byte> listBytePlaintext = new List <byte>();
for (int i = 0; i < ciphertext.Length / 16; i++)
{
byte[] bytesBlock = HelpfulFunctions.SubArrayDeepClone(ciphertext, i * 16, 16);
listBytePlaintext.AddRange(AESFunctions.AES_Decrypt_block(bytesBlock, key));
}
return(listBytePlaintext.ToArray());
}
public static byte[] PropagatingCipherBlockChainingModeDecrypt(byte[] ciphertext, byte[] key, byte[] IV)
{
List <byte> listBytePlaintext = new List <byte>();
byte[] tmp = IV;
for (int i = 0; i < ciphertext.Length / 16; i++)
{
byte[] bytesBlock = HelpfulFunctions.SubArrayDeepClone(ciphertext, i * 16, 16);
byte[] bytesFromDecryptor = AESFunctions.AES_Decrypt_block(bytesBlock, key);
byte[] plaintextBlock = HelpfulFunctions.ExclusiveOR(bytesFromDecryptor, tmp);
listBytePlaintext.AddRange(plaintextBlock);
tmp = HelpfulFunctions.ExclusiveOR(bytesBlock, plaintextBlock);
}
return(listBytePlaintext.ToArray());
}
public static byte[] PropagatingCipherBlockChainingMode2Decrypt(byte[] ciphertext, byte[] key, byte[] IV)
{
List <byte> listBytePlaintext = new List <byte>();
byte[] tmp = IV;
byte[] tmp2 = { 1 };
for (int i = 0; i < ciphertext.Length / 16; i++)
{
byte[] bytesBlock = HelpfulFunctions.SubArrayDeepClone(ciphertext, i * 16, 16);
byte[] tmp2Copy = tmp2;
tmp2 = bytesBlock;
bytesBlock = AESFunctions.AES_Decrypt_block(bytesBlock, key);
if (i != 0)
{
bytesBlock = HelpfulFunctions.ExclusiveOR(bytesBlock, tmp2Copy);
}
tmp = HelpfulFunctions.ExclusiveOR(bytesBlock, tmp);
listBytePlaintext.AddRange(tmp);
}
return(listBytePlaintext.ToArray());
}