import comment

git-svn-id: https://svn.code.sf.net/p/keepassx/code/trunk@1 b624d157-de02-0410-bad0-e51aec6abb33
2005-10-11 19:59:21 +00:00
commit 434e6a5aa3
87 changed files with 22063 additions and 0 deletions
--- a/src/crypto/blowfish.h
+++ b/src/crypto/blowfish.h
@@ -0,0 +1,110 @@
+/***************************************************************************
+ *                                                                         *
+ *   copyright (C) 2003, 2004 by Michael Buesch                            *
+ *   email: mbuesch@freenet.de                                             *
+ *                                                                         *
+ *   blowfish.c  -  Blowfish encryption                                    *
+ *       Copyright (C) 1998, 2001, 2002 Free Software Foundation, Inc.     *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License version 2        *
+ *   as published by the Free Software Foundation.                         *
+ *                                                                         *
+ ***************************************************************************/
+
+#ifndef BLOWFISH_H
+#define BLOWFISH_H
+
+#include <stdint.h>
+#include <string>
+using std::string;
+
+#define BLOWFISH_BLOCKSIZE	8
+#define BLOWFISH_ROUNDS		16
+#define CIPHER_ALGO_BLOWFISH	4	/* blowfish 128 bit key */
+
+typedef uint8_t	byte;
+
+/** blowfish encryption algorithm.
+  * Derived from libgcrypt-1.1.12
+  */
+
+class Blowfish
+{
+	struct BLOWFISH_context
+	{
+		uint32_t s0[256];
+		uint32_t s1[256];
+		uint32_t s2[256];
+		uint32_t s3[256];
+		uint32_t p[BLOWFISH_ROUNDS+2];
+	};
+
+public:
+	Blowfish();
+
+	/** set key to encrypt. if return == 1, it is a weak key. */
+	int bf_setkey( byte *key, unsigned int keylen );
+	/** encrypt inbuf and return it in outbuf.
+	  * inbuf and outbuf have to be: buf % 8 == 0
+	  * You may check this with getPaddedLen() and pad with NULL.
+	  */
+	int bf_encrypt( byte *outbuf, byte *inbuf, unsigned int inbuf_len );
+	/** decrypt inbuf and return it in outbuf.
+	  * inbuf and outbuf have to be: buf % 8 == 0
+	  * You may check this with getPaddedLen() and pad with NULL.
+	  */
+	int bf_decrypt( byte *outbuf, byte *inbuf, unsigned int inbuf_len );
+	/** returns the length, the sting has to be padded to */
+	static unsigned int getPaddedLen(unsigned int inLen)
+			{ return ((8 - (inLen % 8)) + inLen); }
+	/** pad up to 8 bytes. */
+	static void padNull(string *buf);
+	/** remove padded data */
+	static bool unpadNull(string *buf);
+
+protected:
+#if BLOWFISH_ROUNDS != 16
+	uint32_t function_F( uint32_t x)
+	{
+		uint16_t a, b, c, d;
+	#ifdef BIG_ENDIAN_HOST
+		a = ((byte *) & x)[0];
+		b = ((byte *) & x)[1];
+		c = ((byte *) & x)[2];
+		d = ((byte *) & x)[3];
+	#else
+		a = ((byte *) & x)[3];
+		b = ((byte *) & x)[2];
+		c = ((byte *) & x)[1];
+		d = ((byte *) & x)[0];
+	#endif
+		return ((bc.s0[a] + bc.s1[b]) ^ bc.s2[c]) + bc.s3[d];
+	}
+#endif
+	void R(uint32_t &l, uint32_t &r, uint32_t i, uint32_t *p,
+	       uint32_t *s0, uint32_t *s1, uint32_t *s2, uint32_t *s3)
+	{
+		l ^= p[i];
+	#ifdef BIG_ENDIAN_HOST
+		r ^= (( s0[((byte*)&l)[0]] + s1[((byte*)&l)[1]])
+			^ s2[((byte*)&l)[2]]) + s3[((byte*)&l)[3]];
+	#else
+		r ^= (( s0[((byte*)&l)[3]] + s1[((byte*)&l)[2]])
+			^ s2[((byte*)&l)[1]]) + s3[((byte*)&l)[0]];
+	#endif
+	}
+	void encrypt_block(byte *outbuf, byte *inbuf);
+	void decrypt_block(byte *outbuf, byte *inbuf);
+	void burn_stack(int bytes);
+	void do_encrypt(uint32_t *ret_xl, uint32_t *ret_xr);
+	void do_decrypt(uint32_t *ret_xl, uint32_t *ret_xr);
+	void do_encrypt_block(byte *outbuf, byte *inbuf);
+	void do_decrypt_block(byte *outbuf, byte *inbuf);
+	int do_bf_setkey(byte *key, unsigned int keylen);
+
+protected:
+	struct BLOWFISH_context bc;
+};
+
+#endif