private ICryptoTransform GetDecryptorAes(KeyIvModel keyiv)
{
ICryptoTransform result;
using (Aes myAes = Aes.Create())
{
myAes.Mode = _cipheMode;
myAes.KeySize = _keySize;
myAes.Padding = _paddingMode;
result = myAes.CreateDecryptor(keyiv.Key, keyiv.IV);
}
return(result);
}
public byte[] EncryptToByte(byte[] plaintext, KeyIvModel keyiv)
{
var encryptor = GetEncryptorAes(keyiv);
byte[] cipherText;
using (MemoryStream msEncrypt = new MemoryStream())
{
using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
{
csEncrypt.Write(plaintext, 0, plaintext.Length);
}
cipherText = msEncrypt.ToArray();
}
return(cipherText);
}
public string Decrypt(string ciphertext, KeyIvModel keyiv)
{
var cipherbyte = Convert.FromBase64String(ciphertext);
var decryptor = GetDecryptorAes(keyiv);
string plaintext;
using (MemoryStream msDecrypt = new MemoryStream(cipherbyte))
{
using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
using (StreamReader srDecrypt = new StreamReader(csDecrypt))
{
plaintext = srDecrypt.ReadToEnd();
}
}
}
return(plaintext);
}
public void Encrypt(string filename, string outfile, KeyIvModel keyiv)
{
using (FileStream fsCrypt = new FileStream(outfile, FileMode.Create))
{
using (CryptoStream cs = new CryptoStream(fsCrypt, GetEncryptorAes(keyiv), CryptoStreamMode.Write))
{
using (FileStream fsIn = new FileStream(filename, FileMode.Open))
{
byte[] buffer = new byte[1048576];
int read;
while ((read = fsIn.Read(buffer, 0, buffer.Length)) > 0)
{
cs.Write(buffer, 0, read);
}
}
}
}
}
public byte[] DecryptFromByte(byte[] ciphertext, KeyIvModel keyiv)
{
var decryptor = GetDecryptorAes(keyiv);
byte[] plain;
using (MemoryStream msDecrypt = new MemoryStream(ciphertext))
{
using (CryptoStream cryptoStream = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
using (StreamReader stream = new StreamReader(cryptoStream))
{
string sf = stream.ReadToEnd();
plain = System.Text.Encoding.Default.GetBytes(sf);
}
}
}
return(plain);
}
public void Decrypt(string filename, string outfile, KeyIvModel keyiv)
{
var decryptor = GetDecryptorAes(keyiv);
using (FileStream fsCrypt = new FileStream(filename, FileMode.Open))
{
using (CryptoStream cs = new CryptoStream(fsCrypt, decryptor, CryptoStreamMode.Read))
{
using (FileStream fsOut = new FileStream(outfile, FileMode.Create))
{
int data;
while ((data = cs.ReadByte()) != -1)
{
fsOut.WriteByte((byte)data);
}
}
}
}
}
public string Encrypt(string plaintext, KeyIvModel keyiv)
{
var encryptor = GetEncryptorAes(keyiv);
byte[] cipherText;
using (MemoryStream msEncrypt = new MemoryStream())
{
using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
{
using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
{
swEncrypt.Write(plaintext);
}
cipherText = msEncrypt.ToArray();
}
}
var result = Convert.ToBase64String(cipherText);
return(result);
}