mirror of
https://git.teknik.io/Teknikode/Teknik.git
synced 2023-08-02 14:16:22 +02:00
Separated cipher processing into more subfunctions
This commit is contained in:
parent
8d561dd5b8
commit
c68e1d2ec6
@ -14,6 +14,7 @@ using Org.BouncyCastle.Bcpg.OpenPgp;
|
||||
using Org.BouncyCastle.Utilities.IO;
|
||||
using System;
|
||||
using System.Collections.Generic;
|
||||
using System.IO.MemoryMappedFiles;
|
||||
|
||||
namespace Teknik.Utilities
|
||||
{
|
||||
@ -182,11 +183,10 @@ namespace Teknik.Utilities
|
||||
}
|
||||
}
|
||||
|
||||
public static byte[] ProcessCipher(bool encrypt, Stream input, int blockSize, byte[] key, byte[] iv, string mode, string padding)
|
||||
public static byte[] ProcessCipher(bool encrypt, Stream input, int chunkSize, byte[] key, byte[] iv, string mode, string padding)
|
||||
{
|
||||
IBufferedCipher cipher = CipherUtilities.GetCipher("AES/" + mode + "/" + padding);
|
||||
|
||||
cipher.Init(encrypt, new ParametersWithIV(ParameterUtilities.CreateKeyParameter("AES", key), iv));
|
||||
// Create the cipher we are going to use
|
||||
IBufferedCipher cipher = CreateCipher(encrypt, key, iv, mode, padding);
|
||||
|
||||
// Make sure the input stream is at the beginning
|
||||
input.Seek(0, SeekOrigin.Begin);
|
||||
@ -199,18 +199,18 @@ namespace Teknik.Utilities
|
||||
// Process the stream and save the bytes to the output
|
||||
do
|
||||
{
|
||||
processedBytes = ProcessCipherBlock(cipher, input, blockSize, output, cipherOffset);
|
||||
processedBytes = ProcessCipherBlock(cipher, input, chunkSize, output, cipherOffset);
|
||||
cipherOffset += processedBytes;
|
||||
}
|
||||
while (processedBytes > 0);
|
||||
|
||||
// Finalize processing of the cipher
|
||||
cipher.DoFinal(output, cipherOffset);
|
||||
FinalizeCipherBlock(cipher, output, cipherOffset);
|
||||
|
||||
return output;
|
||||
}
|
||||
|
||||
public static void EncryptToFile(string filePath, Stream input, int blockSize, byte[] key, byte[] iv, string mode, string padding)
|
||||
public static void EncryptToFile(string filePath, Stream input, int chunkSize, byte[] key, byte[] iv, string mode, string padding)
|
||||
{
|
||||
IBufferedCipher cipher = CipherUtilities.GetCipher("AES/" + mode + "/" + padding);
|
||||
|
||||
@ -222,26 +222,26 @@ namespace Teknik.Utilities
|
||||
using (FileStream fileStream = new FileStream(filePath, FileMode.Create, FileAccess.Write))
|
||||
{
|
||||
int processedBytes = 0;
|
||||
byte[] buffer = new byte[blockSize];
|
||||
byte[] buffer = new byte[chunkSize];
|
||||
do
|
||||
{
|
||||
processedBytes = ProcessCipherBlock(cipher, input, blockSize, buffer, 0);
|
||||
processedBytes = ProcessCipherBlock(cipher, input, chunkSize, buffer, 0);
|
||||
if (processedBytes > 0)
|
||||
{
|
||||
// We have bytes, lets write them to the file
|
||||
fileStream.Write(buffer, 0, processedBytes);
|
||||
|
||||
// Clear the buffer
|
||||
Array.Clear(buffer, 0, blockSize);
|
||||
Array.Clear(buffer, 0, chunkSize);
|
||||
}
|
||||
}
|
||||
while (processedBytes > 0);
|
||||
|
||||
// Clear the buffer
|
||||
Array.Clear(buffer, 0, blockSize);
|
||||
|
||||
// Do the final output
|
||||
processedBytes = cipher.DoFinal(buffer, 0);
|
||||
Array.Clear(buffer, 0, chunkSize);
|
||||
|
||||
// Finalize processing of the cipher
|
||||
processedBytes = FinalizeCipherBlock(cipher, buffer, 0);
|
||||
if (processedBytes > 0)
|
||||
{
|
||||
// We have bytes, lets write them to the file
|
||||
@ -250,13 +250,22 @@ namespace Teknik.Utilities
|
||||
}
|
||||
}
|
||||
|
||||
public static int ProcessCipherBlock(IBufferedCipher cipher, Stream input, int blockSize, byte[] output, int outputOffset)
|
||||
public static IBufferedCipher CreateCipher(bool encrypt, byte[] key, byte[] iv, string mode, string padding)
|
||||
{
|
||||
IBufferedCipher cipher = CipherUtilities.GetCipher("AES/" + mode + "/" + padding);
|
||||
|
||||
cipher.Init(encrypt, new ParametersWithIV(ParameterUtilities.CreateKeyParameter("AES", key), iv));
|
||||
|
||||
return cipher;
|
||||
}
|
||||
|
||||
public static int ProcessCipherBlock(IBufferedCipher cipher, Stream input, int chunkSize, byte[] output, int outputOffset)
|
||||
{
|
||||
// Initialize buffer
|
||||
byte[] buffer = new byte[blockSize];
|
||||
byte[] buffer = new byte[chunkSize];
|
||||
|
||||
// Read the next block of data
|
||||
int bytesRead = input.Read(buffer, 0, blockSize);
|
||||
int bytesRead = input.Read(buffer, 0, chunkSize);
|
||||
if (bytesRead > 0)
|
||||
{
|
||||
// process the cipher for the read block and add it to the output
|
||||
@ -266,6 +275,12 @@ namespace Teknik.Utilities
|
||||
return 0;
|
||||
}
|
||||
|
||||
public static int FinalizeCipherBlock(IBufferedCipher cipher, byte[] output, int outputOffset)
|
||||
{
|
||||
// perform final action on cipher
|
||||
return cipher.DoFinal(output, outputOffset);
|
||||
}
|
||||
|
||||
public static byte[] CreateKey(string password, string iv, int keySize = 256)
|
||||
{
|
||||
byte[] ivBytes = Encoding.UTF8.GetBytes(iv);
|
||||
|
Loading…
Reference in New Issue
Block a user