From 58b919244afecc02ea141993a9d22e9e3ff4d5db Mon Sep 17 00:00:00 2001
From: brain <brain@e03df62e-2008-0410-955e-edbf42e46eb7>
Date: Mon, 19 Dec 2005 13:38:14 +0000
Subject: Added AES stuff

git-svn-id: http://svn.inspircd.org/repository/trunk/inspircd@2567 e03df62e-2008-0410-955e-edbf42e46eb7
---
 include/aes.h | 163 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 163 insertions(+)
 create mode 100644 include/aes.h

(limited to 'include/aes.h')

diff --git a/include/aes.h b/include/aes.h
new file mode 100644
index 000000000..66e68cac9
--- /dev/null
+++ b/include/aes.h
@@ -0,0 +1,163 @@
+#ifndef __AES_H__
+#define __AES_H__
+
+#include <cstring>
+
+using namespace std;
+
+class AES
+{
+public:
+	enum { ECB=0, CBC=1, CFB=2 };
+
+private:
+	enum { DEFAULT_BLOCK_SIZE=16 };
+	enum { MAX_BLOCK_SIZE=32, MAX_ROUNDS=14, MAX_KC=8, MAX_BC=8 };
+
+	static int Mul(int a, int b)
+	{
+		return (a != 0 && b != 0) ? sm_alog[(sm_log[a & 0xFF] + sm_log[b & 0xFF]) % 255] : 0;
+	}
+
+	//Convenience method used in generating Transposition Boxes
+	static int Mul4(int a, char b[])
+	{
+		if(a == 0)
+			return 0;
+		a = sm_log[a & 0xFF];
+		int a0 = (b[0] != 0) ? sm_alog[(a + sm_log[b[0] & 0xFF]) % 255] & 0xFF : 0;
+		int a1 = (b[1] != 0) ? sm_alog[(a + sm_log[b[1] & 0xFF]) % 255] & 0xFF : 0;
+		int a2 = (b[2] != 0) ? sm_alog[(a + sm_log[b[2] & 0xFF]) % 255] & 0xFF : 0;
+		int a3 = (b[3] != 0) ? sm_alog[(a + sm_log[b[3] & 0xFF]) % 255] & 0xFF : 0;
+		return a0 << 24 | a1 << 16 | a2 << 8 | a3;
+	}
+
+public:
+	//CONSTRUCTOR
+	AES();
+
+	//DESTRUCTOR
+	virtual ~AES();
+
+	//Expand a user-supplied key material into a session key.
+	// key        - The 128/192/256-bit user-key to use.
+	// chain      - initial chain block for CBC and CFB modes.
+	// keylength  - 16, 24 or 32 bytes
+	// blockSize  - The block size in bytes of this Rijndael (16, 24 or 32 bytes).
+	void MakeKey(char const* key, char const* chain, int keylength=DEFAULT_BLOCK_SIZE, int blockSize=DEFAULT_BLOCK_SIZE);
+
+private:
+	//Auxiliary Function
+	void Xor(char* buff, char const* chain)
+	{
+		if(false==m_bKeyInit)
+			return;
+		for(int i=0; i<m_blockSize; i++)
+			*(buff++) ^= *(chain++);	
+	}
+
+	//Convenience method to encrypt exactly one block of plaintext, assuming
+	//Rijndael's default block size (128-bit).
+	// in         - The plaintext
+	// result     - The ciphertext generated from a plaintext using the key
+	void DefEncryptBlock(char const* in, char* result);
+
+	//Convenience method to decrypt exactly one block of plaintext, assuming
+	//Rijndael's default block size (128-bit).
+	// in         - The ciphertext.
+	// result     - The plaintext generated from a ciphertext using the session key.
+	void DefDecryptBlock(char const* in, char* result);
+
+public:
+	//Encrypt exactly one block of plaintext.
+	// in           - The plaintext.
+	// result       - The ciphertext generated from a plaintext using the key.
+	void EncryptBlock(char const* in, char* result);
+	
+	//Decrypt exactly one block of ciphertext.
+	// in         - The ciphertext.
+	// result     - The plaintext generated from a ciphertext using the session key.
+	void DecryptBlock(char const* in, char* result);
+
+	void Encrypt(char const* in, char* result, size_t n, int iMode=ECB);
+	
+	void Decrypt(char const* in, char* result, size_t n, int iMode=ECB);
+
+	//Get Key Length
+	int GetKeyLength()
+	{
+		if(false==m_bKeyInit)
+			return 0;
+		return m_keylength;
+	}
+
+	//Block Size
+	int GetBlockSize()
+	{
+		if(false==m_bKeyInit)
+			return 0;
+		return m_blockSize;
+	}
+	
+	//Number of Rounds
+	int GetRounds()
+	{
+		if(false==m_bKeyInit)
+			return 0;
+		return m_iROUNDS;
+	}
+
+	void ResetChain()
+	{
+		memcpy(m_chain, m_chain0, m_blockSize);
+	}
+
+public:
+	//Null chain
+	static char const* sm_chain0;
+
+private:
+	static const int sm_alog[256];
+	static const int sm_log[256];
+	static const char sm_S[256];
+	static const char sm_Si[256];
+	static const int sm_T1[256];
+	static const int sm_T2[256];
+	static const int sm_T3[256];
+	static const int sm_T4[256];
+	static const int sm_T5[256];
+	static const int sm_T6[256];
+	static const int sm_T7[256];
+	static const int sm_T8[256];
+	static const int sm_U1[256];
+	static const int sm_U2[256];
+	static const int sm_U3[256];
+	static const int sm_U4[256];
+	static const char sm_rcon[30];
+	static const int sm_shifts[3][4][2];
+	//Error Messages
+	static char const* sm_szErrorMsg1;
+	static char const* sm_szErrorMsg2;
+	//Key Initialization Flag
+	bool m_bKeyInit;
+	//Encryption (m_Ke) round key
+	int m_Ke[MAX_ROUNDS+1][MAX_BC];
+	//Decryption (m_Kd) round key
+	int m_Kd[MAX_ROUNDS+1][MAX_BC];
+	//Key Length
+	int m_keylength;
+	//Block Size
+	int	m_blockSize;
+	//Number of Rounds
+	int m_iROUNDS;
+	//Chain Block
+	char m_chain0[MAX_BLOCK_SIZE];
+	char m_chain[MAX_BLOCK_SIZE];
+	//Auxiliary private use buffers
+	int tk[MAX_KC];
+	int a[MAX_BC];
+	int t[MAX_BC];
+};
+
+#endif // __RIJNDAEL_H__
+
-- 
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