dcaesar.c

简单的vigenere解密及其解密功能实现代码

#include <stdio.h>

#include "dcaesar.h"

extern unsigned char dcaesar_encrypt( unsigned char p,
				      int k, 
				      int base, 
				      int start )
{
	return ((p+k)%base+start);
};

extern unsigned char dcaesar_decrypt( unsigned char c,
				      int k, 
				      int base, 
				      int start )
{
	return ((c+base-k)%base+start);
};