Playfair密码C语言源代码(共6页).doc

/PLAYFAIR.H头文件#ifndef _PLAY_FAIR_H_#define _PLAY_FAIR_H_void cst_playfair_table (char *in_key);void prnt_playfair_table ();int playfair_encrypt (char *plain_txt, char *cipher_txt);int playfair_decrypt (char *cipher_txt, char *plain_txt);#endif/PLAYFAIR.C源文件#include playfair.h#include #include #include char playfair_table55;void get_x_y (char c, int *x, int *y)int i, j;for (i = 0; i 5; +i)for (j = 0; j