/*********************************************************************************
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* Copyright: (C) 2018 LingYun IoT System Studio
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* All rights reserved.
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*
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* Filename: crypto.c
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* Description: This file is LingYun crypto library
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*
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* Version: 1.0.0(2018年12月20日)
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* Author: Guo Wenxue <guowenxue@gmail.com>
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* ChangeLog: 1, Release initial version on "2018年12月20日 11时56分04秒"
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*
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********************************************************************************/
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#include <string.h>
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int encrypt(char *plaintext, char *ciphertext, int size)
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{
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int i;
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if( size < strlen(plaintext) )
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{
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return -1;
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}
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for(i=0; i<strlen(plaintext); i++)
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{
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ciphertext[i] = plaintext[i]+3;
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}
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return 0;
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}
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int decrypt(char *ciphertext, char *plaintext, int size)
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{
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int i;
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if( size < strlen(ciphertext) )
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{
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return -1;
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}
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for(i=0; i<strlen(ciphertext); i++)
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{
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plaintext[i] = ciphertext[i]-3;
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}
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return 0;
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}
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