public void Aes_Encrypt(string fileInput, string fileOutput, string password, int keySize,
CipherMode mode = CipherMode.CFB, Encoding enc = null)
{
if (enc == null)
enc = Encoding.Default;
if (!((keySize == 128) | (keySize == 192) | (keySize == 256)))
keySize = 256;
var buffersize
= GetBufferSize
(new FileInfo
(fileInput
).Length); var salt = GenerateSalt();
using (var fsOut
= new FileStream
(fileOutput, FileMode
.Create)) {
var passBytes = enc.GetBytes(password);
using (var aes
= new RijndaelManaged
()) {
var pdb
= new Rfc2898DeriveBytes
(passBytes, salt,
50000); aes.KeySize = keySize;
aes.Padding = PaddingMode.PKCS7;
aes.Key = pdb.GetBytes(keySize/8);
aes.IV = pdb.GetBytes(16);
aes.Mode = mode;
fsOut.Write(salt, 0, salt.Length);
using (var cs
= new CryptoStream
(fsOut, aes
.CreateEncryptor(), CryptoStreamMode
.Write)) {
using (var fsInp
= new FileStream
(fileInput, FileMode
.Open)) {
var tmpBuffer
= new byte[buffersize
]; var bytesRead = 0;
do
{
bytesRead = fsInp.Read(tmpBuffer, 0, tmpBuffer.Length);
cs.Write(tmpBuffer, 0, bytesRead);
} while (bytesRead > 0);
}
}
}
}
}
public void Aes_Decrypt(string fileinput, string fileoutput, string password, int keySize,
CipherMode mode = CipherMode.CFB, Encoding enc = null)
{
if (enc == null)
enc = Encoding.UTF8;
if (!((keySize == 128) | (keySize == 192) | (keySize == 256)))
keySize = 256;
var buffersize
= GetBufferSize
(new FileInfo
(fileinput
).Length); using (var fsIn
= new FileStream
(fileinput, FileMode
.Open)) {
fsIn.Read(salt, 0, salt.Length);
var passBytes = enc.GetBytes(password);
using (var crypto
= new RijndaelManaged
()) {
var pdb
= new Rfc2898DeriveBytes
(passBytes, salt,
50000);
crypto.KeySize = keySize;
crypto.Padding = PaddingMode.PKCS7;
crypto.Key = pdb.GetBytes(keySize/8);
crypto.IV = pdb.GetBytes(16);
crypto.Mode = mode;
using (var cs
= new CryptoStream
(fsIn, crypto
.CreateDecryptor(), CryptoStreamMode
.Read)) {
using (var fsOut
= new FileStream
(fileoutput, FileMode
.Create)) {
var tmpBuffer
= new byte[buffersize
]; var bytesRead = 0;
do
{
bytesRead = cs.Read(tmpBuffer, 0, tmpBuffer.Length);
fsOut.Write(tmpBuffer, 0, bytesRead);
} while (bytesRead > 0);
}
}
}
}
}
private byte[] GenerateSalt()
{
using (var rng
= new RNGCryptoServiceProvider
()) {
rng.GetBytes(data);
}
return data;
}
public int GetBufferSize(long filesize)
{
return filesize >= 1073741824
? 1048576
: (filesize >= 524288000
? 524288
: (filesize >= 104857600
? 131072
: (filesize >= 10485760 ? 32768 : (filesize >= 1048576 ? 8192 : 4096))));
}
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Agosto 07, 2017, 12:50:12 pm