blowfish encryption header file

src/include/blf.h

@@ -0,0 +1,54 @@
+/* $OpenBSD: blf.h,v 1.1 1997/02/13 16:32:11 provos Exp $ */
+/*
+ * Blowfish - a fast block cipher designed by Bruce Schneier
+ *
+ * Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de>
+ *
+ * Modification and redistribution in source and binary forms is
+ * permitted provided that due credit is given to the author and the
+ * OpenBSD project (for instance by leaving this copyright notice
+ * intact).
+ */
+
+#ifndef _BLF_H_
+#define _BLF_H_
+
+/* Schneier states the maximum key length to be 56 bytes.
+ * The way how the subkeys are initalized by the key up
+ * to (N+2)*4 i.e. 72 bytes are utilized.
+ * Warning: For normal blowfish encryption only 56 bytes
+ * of the key affect all cipherbits.
+ */
+
+#define BLF_N	16			/* Number of Subkeys */
+#define BLF_MAXKEYLEN ((BLF_N-2)*4)	/* 448 bits */
+
+/* Blowfish context */
+typedef struct BlowfishContext {
+	u_int32_t S[4][256];	/* S-Boxes */
+	u_int32_t P[BLF_N + 2];	/* Subkeys */
+} blf_ctx;
+
+/* Raw access to customized Blowfish
+ *	blf_key is just:
+ *	Blowfish_initstate( state )
+ *	Blowfish_expand0state( state, key, keylen )
+ */
+
+void Blowfish_encipher __P((blf_ctx *, u_int32_t *, u_int32_t *));
+void Blowfish_decipher __P((blf_ctx *, u_int32_t *, u_int32_t *));
+void Blowfish_initstate __P((blf_ctx *));
+void Blowfish_expand0state __P((blf_ctx *, u_int8_t *, u_int16_t));
+void    Blowfish_expandstate
+        __P((blf_ctx *, u_int8_t *, u_int16_t, u_int8_t *, u_int16_t));
+
+/* Standard Blowfish */
+
+void blf_key __P((blf_ctx *, u_int8_t *, u_int16_t));
+void blf_enc __P((blf_ctx *, u_int32_t *, u_int16_t));
+void blf_dec __P((blf_ctx *, u_int32_t *, u_int16_t));
+
+/* Converts u_int8_t to u_int32_t */
+u_int32_t Blowfish_stream2word __P((u_int8_t *, u_int16_t , u_int16_t *));
+
+#endif