#ifndef _IDEA_H_2a050870_
#define _IDEA_H_2a050870_

/* porting defines: IDEA__U16 should be unsigned integer type with
   at least 16 bits; IDEA__U32, ditto with 32 bits.  They can be wider,
   but the extra space will be wasted.  The code assumes 8-bit chars;
   if chars are wider, only the low 8 bits of each will be used. */

typedef unsigned short int IDEA__U16;
typedef unsigned long int IDEA__U32;

/* Opaque structures */

/* IDEA_KEY is a key schedule, filled in by idea_setkey_* or idea_keycvt_*. */

typedef struct {
	  IDEA__U16 Z[52];
	  } IDEA_KEY;

/* Routine interfaces */

/* idea_setkey_e fills in a key schedule for encryption,
   given a pointer to 16 bytes (128 bits) of IDEA key. */
extern void idea_setkey_e(const void *, IDEA_KEY *);

/* idea_setkey_d fills in a key schedule for decryption,
   given a pointer to 16 bytes (128 bits) of IDEA key. */
extern void idea_setkey_d(const void *, IDEA_KEY *);

/* idea_keycvt_e_to_d converts an IDEA_KEY set up for encryption
   to another set up for decryption.  The arguments may be the same. */
extern void idea_keycvt_e_to_d(const IDEA_KEY *, IDEA_KEY *);

/* idea_keycvt_d_to_e converts an IDEA_KEY set up for decryption
   to another set up for encryption.  The arguments may be the same. */
extern void idea_keycvt_d_to_e(const IDEA_KEY *, IDEA_KEY *);

/* idea_crypt does encryption or decryption, depending on whether the
   key schedule argument is set up for encryption or decryption.  The
   8-byte (64-bit) input and output data buffers may be the same. */
extern void idea_crypt(const void *, const IDEA_KEY *, void *);

#endif