public byte[] ComputeAESRound(AESDir aesDir, byte[] iv, byte[] input, byte[] keyBytes)
{
Guard.NotNull(new object[] { iv, input, keyBytes });
switch (aesDir)
{
case AESDir.Encrypt:
using (var aes = CreateAesManaged(iv, keyBytes))
using (var stream = new MemoryStream())
{
using (var encryptor = aes.CreateEncryptor())
using (var encrypt = new CryptoStream(stream, encryptor, CryptoStreamMode.Write))
{
encrypt.Write(input, 0, input.Length);
encrypt.FlushFinalBlock();
}
return(stream.ToArray());
}
case AESDir.Decrpyt:
using (var aes = CreateAesManaged(iv, keyBytes))
using (var stream = new MemoryStream())
{
using (var decryptor = aes.CreateDecryptor())
using (var decrypt = new CryptoStream(stream, decryptor, CryptoStreamMode.Write))
{
decrypt.Write(input, 0, input.Length);
decrypt.FlushFinalBlock();
}
return(stream.ToArray());
}
}
throw new InvalidOperationException(string.Format("{0} is not supported", aesDir));
}
byte[] ComputeAESWithRounds(AESDir aesDir, IV16 iv, byte[] dataBytes, byte[] keyBytes, byte roundsExp, IVCache ivCache, LongRunningOperationContext context)
{
Guard.NotNull(new object[] { aesDir, iv, dataBytes, keyBytes, roundsExp, ivCache, context });
var rounds = 1u << roundsExp;
var roundsToGo = rounds;
byte[] inputData = dataBytes;
byte[] aesResult = null;
while (roundsToGo > 0)
{
byte[] currentIV =
aesDir == AESDir.Encrypt
? ivCache.IVTable.Item2[roundsToGo - 1]
: ivCache.IVTable.Item2[ivCache.IVTable.Item2.Length - roundsToGo];
aesResult = this._platform.ComputeAESRound(aesDir, currentIV, inputData, keyBytes);
inputData = aesResult;
roundsToGo--; // decrement before calculating the percentage or we'll be stuck at 99%
// START encryptionProgress / Cancellation
context.CancellationToken.ThrowIfCancellationRequested();
decimal progressValue = (rounds - roundsToGo) / (decimal)(rounds);
context.EncryptionProgress.Percent = (int)(progressValue * 100m);
context.EncryptionProgress.Report(context.EncryptionProgress);
// END encryptionProgress
}
return(aesResult);
}