internal override EncoderNode CreateEncoder()
{
var passwordAccess = default(PasswordAccessor);
var encryptionKey = default(byte[]);
var passwordBytes = default(byte[]);
try
{
passwordAccess = mPassword.GetPassword();
passwordBytes = Encoding.Unicode.GetBytes(passwordAccess);
encryptionKey = Reader.AesArchiveDecoder.InitKey(mSlowdown, mSeed.mSalt, passwordBytes);
using (var aes = System.Security.Cryptography.Aes.Create())
{
aes.Mode = System.Security.Cryptography.CipherMode.CBC;
aes.Padding = System.Security.Cryptography.PaddingMode.None;
return(new AesEncoderNode(aes.CreateEncryptor(encryptionKey, mSeed.mSeed16)));
}
}
finally
{
passwordAccess.Dispose();
Utilities.ClearBuffer(ref passwordBytes);
Utilities.ClearBuffer(ref encryptionKey);
}
}
private void Initialize(Stream input, byte[] info, PasswordStorage password, long limit)
{
mBuffer = new byte[4 << 10];
mStream = input;
mLimit = limit;
// The 7z AES encoder/decoder classes do not perform padding, instead they require the input stream to provide a multiple of 16 bytes.
// If the exception below is thrown this means the 7z file is either corrupt or a newer 7z version has been published and we haven't updated yet.
if (((uint)input.Length & 15) != 0)
{
throw new NotSupportedException("7z requires AES streams to be properly padded.");
}
int numCyclesPower;
byte[] salt, seed;
Init(info, out numCyclesPower, out salt, out seed);
byte[] pass = null;
byte[] key = null;
try
{
using (var accessor = password.GetPassword())
pass = Encoding.Unicode.GetBytes(accessor);
key = InitKey(numCyclesPower, salt, pass);
using (var aes = Aes.Create())
{
aes.Mode = CipherMode.CBC;
aes.Padding = PaddingMode.None;
mDecoder = aes.CreateDecryptor(key, seed);
}
}
finally
{
Utilities.ClearBuffer(ref pass);
Utilities.ClearBuffer(ref key);
}
}
private void Initialize(Stream input, byte[] info, PasswordStorage password, long limit)
{
mBuffer = new byte[4 << 10];
mStream = input;
mLimit = limit;
// The 7z AES encoder/decoder classes do not perform padding, instead they require the input stream to provide a multiple of 16 bytes.
// If the exception below is thrown this means the 7z file is either corrupt or a newer 7z version has been published and we haven't updated yet.
if (((uint)input.Length & 15) != 0)
throw new NotSupportedException("7z requires AES streams to be properly padded.");
int numCyclesPower;
byte[] salt, seed;
Init(info, out numCyclesPower, out salt, out seed);
byte[] pass = null;
byte[] key = null;
try
{
using (var accessor = password.GetPassword())
pass = Encoding.Unicode.GetBytes(accessor);
key = InitKey(numCyclesPower, salt, pass);
using (var aes = Aes.Create())
{
aes.Mode = CipherMode.CBC;
aes.Padding = PaddingMode.None;
mDecoder = aes.CreateDecryptor(key, seed);
}
}
finally
{
Utilities.ClearBuffer(ref pass);
Utilities.ClearBuffer(ref key);
}
}