From 9247ce1bb90c44d19a0069fadb12c0c480ac9b4f Mon Sep 17 00:00:00 2001
From: lealem47 <60322859+lealem47@users.noreply.github.com>
Date: Sun, 12 Nov 2023 16:51:31 -0700
Subject: wolfCrypt as crypto backend for VeraCrypt (#1227)

* wolfCrypt as crypto backend for VeraCrypt

* Refactor to use EncryptionModeWolfCryptXTS class
---
 src/Volume/EncryptionModeWolfCryptXTS.cpp | 119 ++++++++++++++++++++++++++++++
 1 file changed, 119 insertions(+)
 create mode 100644 src/Volume/EncryptionModeWolfCryptXTS.cpp

(limited to 'src/Volume/EncryptionModeWolfCryptXTS.cpp')

diff --git a/src/Volume/EncryptionModeWolfCryptXTS.cpp b/src/Volume/EncryptionModeWolfCryptXTS.cpp
new file mode 100644
index 00000000..891f6007
--- /dev/null
+++ b/src/Volume/EncryptionModeWolfCryptXTS.cpp
@@ -0,0 +1,119 @@
+
+#include "Crypto/cpu.h"
+#include "Crypto/misc.h"
+#include "EncryptionModeWolfCryptXTS.h"
+#include "Common/Crypto.h"
+
+namespace VeraCrypt
+{
+	void EncryptionModeWolfCryptXTS::Encrypt (byte *data, uint64 length) const
+	{
+		EncryptBuffer (data, length, 0);
+	}
+
+	void EncryptionModeWolfCryptXTS::EncryptBuffer (byte *data, uint64 length, uint64 startDataUnitNo) const
+	{
+		if_debug (ValidateState());
+
+		CipherList::const_iterator iSecondaryCipher = SecondaryCiphers.begin();
+
+		for (CipherList::const_iterator iCipher = Ciphers.begin(); iCipher != Ciphers.end(); ++iCipher)
+		{
+			EncryptBufferXTS (**iCipher, **iSecondaryCipher, data, length, startDataUnitNo, 0);
+			++iSecondaryCipher;
+		}
+
+		assert (iSecondaryCipher == SecondaryCiphers.end());
+	}
+
+	void EncryptionModeWolfCryptXTS::EncryptBufferXTS (Cipher &cipher, const Cipher &secondaryCipher, byte *buffer, uint64 length, uint64 startDataUnitNo, unsigned int startCipherBlockNo) const
+	{
+                cipher.EncryptBlockXTS(buffer, length, startDataUnitNo);
+	}
+
+	void EncryptionModeWolfCryptXTS::EncryptSectorsCurrentThread (byte *data, uint64 sectorIndex, uint64 sectorCount, size_t sectorSize) const
+	{
+		EncryptBuffer (data, sectorCount * sectorSize, sectorIndex * sectorSize / ENCRYPTION_DATA_UNIT_SIZE);
+	}
+
+	size_t EncryptionModeWolfCryptXTS::GetKeySize () const
+	{
+		if (Ciphers.empty())
+			throw NotInitialized (SRC_POS);
+
+		size_t keySize = 0;
+		foreach_ref (const Cipher &cipher, SecondaryCiphers)
+		{
+			keySize += cipher.GetKeySize();
+		}
+
+		return keySize;
+	}
+
+	void EncryptionModeWolfCryptXTS::Decrypt (byte *data, uint64 length) const
+	{
+		DecryptBuffer (data, length, 0);
+	}
+
+	void EncryptionModeWolfCryptXTS::DecryptBuffer (byte *data, uint64 length, uint64 startDataUnitNo) const
+	{
+		if_debug (ValidateState());
+
+		CipherList::const_iterator iSecondaryCipher = SecondaryCiphers.end();
+
+		for (CipherList::const_reverse_iterator iCipher = Ciphers.rbegin(); iCipher != Ciphers.rend(); ++iCipher)
+		{
+			--iSecondaryCipher;
+			DecryptBufferXTS (**iCipher, **iSecondaryCipher, data, length, startDataUnitNo, 0);
+		}
+
+		assert (iSecondaryCipher == SecondaryCiphers.begin());
+	}
+
+	void EncryptionModeWolfCryptXTS::DecryptBufferXTS (Cipher &cipher, const Cipher &secondaryCipher, byte *buffer, uint64 length, uint64 startDataUnitNo, unsigned int startCipherBlockNo) const
+	{
+                cipher.DecryptBlockXTS(buffer, length, startDataUnitNo);
+        }
+
+	void EncryptionModeWolfCryptXTS::DecryptSectorsCurrentThread (byte *data, uint64 sectorIndex, uint64 sectorCount, size_t sectorSize) const
+	{
+		DecryptBuffer (data, sectorCount * sectorSize, sectorIndex * sectorSize / ENCRYPTION_DATA_UNIT_SIZE);
+	}
+
+	void EncryptionModeWolfCryptXTS::SetCiphers (const CipherList &ciphers)
+	{
+		EncryptionMode::SetCiphers (ciphers);
+
+		SecondaryCiphers.clear();
+
+		foreach_ref (const Cipher &cipher, ciphers)
+		{
+			SecondaryCiphers.push_back (cipher.GetNew());
+		}
+
+		if (SecondaryKey.Size() > 0)
+			SetSecondaryCipherKeys();
+	}
+
+	void EncryptionModeWolfCryptXTS::SetKey (const ConstBufferPtr &key)
+	{
+		SecondaryKey.Allocate (key.Size());
+		SecondaryKey.CopyFrom (key);
+
+		if (!SecondaryCiphers.empty())
+			SetSecondaryCipherKeys();
+
+        }
+
+	void EncryptionModeWolfCryptXTS::SetSecondaryCipherKeys ()
+	{
+		size_t keyOffset = 0;
+		foreach_ref (Cipher &cipher, SecondaryCiphers)
+		{
+                        cipher.SetKeyXTS (SecondaryKey.GetRange (keyOffset, cipher.GetKeySize()));
+                        keyOffset += cipher.GetKeySize();
+		}
+
+		KeySet = true;
+	}
+}
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