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idea.h
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C/C++ Source or Header
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1995-09-28
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2KB
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56 lines
#ifndef IDEA_H
#define IDEA_H
/*
* idea.h - header file for idea.c
*/
#include "usuals.h" /* typedefs for byte, word16, boolean, etc. */
#define IDEAKEYSIZE 16
#define IDEABLOCKSIZE 8
#define IDEAROUNDS 8
#define IDEAKEYLEN (6*IDEAROUNDS+4)
/*
* iv[] is used as a circular buffer. bufleft is the number of
* bytes at the end which have to be filled in before we crank
* the block cipher again. We do the block cipher operation
* lazily: bufleft may be 0. When we need one more byte, we
* crank the block cipher and set bufleft to 7.
*
* oldcipher[] holds the previous 8 bytes of ciphertext, for use
* by ideaCfbSync() and Phil's, ahem, unique (not insecure, just
* unusual) way of doing CFB encryption.
*/
struct IdeaCfbContext {
byte oldcipher[8];
byte iv[8];
word16 key[IDEAKEYLEN];
int bufleft;
};
struct IdeaRandContext {
byte outbuf[8];
word16 key[IDEAKEYLEN];
int bufleft;
byte internalbuf[8];
};
void ideaCfbReinit(struct IdeaCfbContext *context, byte const *iv);
void ideaCfbInit(struct IdeaCfbContext *context, byte const (key[16]));
void ideaCfbSync(struct IdeaCfbContext *context);
void ideaCfbDestroy(struct IdeaCfbContext *context);
void ideaCfbEncrypt(struct IdeaCfbContext *context,
byte const *src, byte *dest, int count);
void ideaCfbDecrypt(struct IdeaCfbContext *context,
byte const *src, byte *dest, int count);
void ideaRandInit(struct IdeaRandContext *context, byte const (key[16]),
byte const (seed[8]));
byte ideaRandByte(struct IdeaRandContext *c);
void ideaRandWash(struct IdeaRandContext *c, struct IdeaCfbContext *cfb);
void ideaRandState(struct IdeaRandContext *c, byte key[16], byte seed[8]);
#endif /* !IDEA_H */