/* idea.h */
#ifndef _IDEA_DOT_H
#define _IDEA_DOT_H                                            //防止重復包含idea.h
#define word16 unsigned short
#define word32 unsigned int
#define ROUNDS 8                                              //輪數(shù)
#define KEYLEN (6*ROUNDS+4)
#define low16(x) ((x)&0xffff)                                 //取低16位
typedef word16 IDEAkey[KEYLEN];
/*IDEA Algorithm functions*/
void en_key_idea(word16 userkey[8],IDEAkey Z);                //生成加密子密鑰
void de_key_idea(IDEAkey Z,IDEAkey DK);                       //生成解密子密鑰
void cipher_idea(word16 in[4],word16 out[4],IDEAkey Z);       //加密算法
word16 inv(word16 x);                                         //求模2(16)+1乘法逆元
word16 mul(word16 a,word16 b);                                //模2(16)+1乘法
#endif