private void Decrypt()
{
if (m_pbData.Length == 0)
{
return;
}
if (m_mp == PbMemProt.ProtectedMemory)
{
ProtectedMemory.Unprotect(m_pbData, MemoryProtectionScope.SameProcess);
}
else if (m_mp == PbMemProt.Salsa20)
{
Salsa20Cipher s = new Salsa20Cipher(g_pbKey32,
BitConverter.GetBytes(m_lID));
s.Encrypt(m_pbData, m_pbData.Length, true);
s.Dispose();
}
else if (m_mp == PbMemProt.ExtCrypt)
{
m_fExtCrypt(m_pbData, PbCryptFlags.Decrypt, m_lID);
}
else
{
Debug.Assert(m_mp == PbMemProt.None);
}
m_mp = PbMemProt.None;
}
private void Decrypt()
{
if (passwordData.Length == 0)
{
return;
}
if (passwordMemoryProtection == PbMemProt.ProtectedMemory)
{
ProtectedMemory.Unprotect(passwordData, MemoryProtectionScope.SameProcess);
}
else if (passwordMemoryProtection == PbMemProt.Salsa20)
{
var cipher = new Salsa20Cipher(keyBytes32, BitConverter.GetBytes(longId));
cipher.Encrypt(passwordData, passwordData.Length, true);
cipher.Dispose();
}
else if (passwordMemoryProtection == PbMemProt.ExtCrypt)
{
m_fExtCrypt(passwordData, PbCryptFlags.Decrypt, longId);
}
else
{
Debug.Assert(passwordMemoryProtection == PbMemProt.None);
}
passwordMemoryProtection = PbMemProt.None;
}
private void Dispose(bool disposing)
{
if (disposing)
{
if (m_crsAlgorithm == CrsAlgorithm.ChaCha20)
{
m_chacha20.Dispose();
}
else if (m_crsAlgorithm == CrsAlgorithm.Salsa20)
{
m_salsa20.Dispose();
}
else if (m_crsAlgorithm == CrsAlgorithm.ArcFourVariant)
{
MemUtil.ZeroByteArray(m_pbState);
m_i = 0;
m_j = 0;
}
else
{
Debug.Assert(false);
}
m_bDisposed = true;
}
}
private void Encrypt()
{
Debug.Assert(m_mp == PbMemProt.None);
// Nothing to do if caller didn't request protection
if (!m_bProtected)
{
return;
}
// ProtectedMemory.Protect throws for data size == 0
if (m_pbData.Length == 0)
{
return;
}
PbCryptDelegate f = g_fExtCrypt;
if (f != null)
{
f(m_pbData, PbCryptFlags.Encrypt, m_lID);
m_fExtCrypt = f;
m_mp = PbMemProt.ExtCrypt;
return;
}
if (ProtectedBinary.ProtectedMemorySupported)
{
ProtectedMemory.Protect(m_pbData, MemoryProtectionScope.SameProcess);
m_mp = PbMemProt.ProtectedMemory;
return;
}
byte[] pbKey32 = g_pbKey32;
if (pbKey32 == null)
{
pbKey32 = CryptoRandom.Instance.GetRandomBytes(32);
byte[] pbUpd = Interlocked.Exchange <byte[]>(ref g_pbKey32, pbKey32);
if (pbUpd != null)
{
pbKey32 = pbUpd;
}
}
Salsa20Cipher s = new Salsa20Cipher(pbKey32,
BitConverter.GetBytes(m_lID));
s.Encrypt(m_pbData, m_pbData.Length, true);
s.Dispose();
m_mp = PbMemProt.Salsa20;
}
private void Encrypt()
{
Debug.Assert(passwordMemoryProtection == PbMemProt.None);
if (!isProtected)
{
return;
}
if (passwordData.Length == 0)
{
return;
}
var f = encryptionDelegate;
if (f != null)
{
f(passwordData, PbCryptFlags.Encrypt, longId);
m_fExtCrypt = f;
passwordMemoryProtection = PbMemProt.ExtCrypt;
return;
}
if (ProtectedMemorySupported)
{
ProtectedMemory.Protect(passwordData, MemoryProtectionScope.SameProcess);
passwordMemoryProtection = PbMemProt.ProtectedMemory;
return;
}
var pbKey32 = keyBytes32;
if (pbKey32 == null)
{
pbKey32 = CryptoRandom.Instance.GetRandomBytes(32);
var pbUpd = Interlocked.Exchange(ref keyBytes32, pbKey32);
if (pbUpd != null)
{
pbKey32 = pbUpd;
}
}
var cipher = new Salsa20Cipher(pbKey32, BitConverter.GetBytes(longId));
cipher.Encrypt(passwordData, passwordData.Length, true);
cipher.Dispose();
passwordMemoryProtection = PbMemProt.Salsa20;
}