/********************************************************************
??P-CODE:
????function?hmac?（key?message）?{
????????if?（length（key）?>?blocksize）?{
????????????key?=?hash（key）?//?keys?longer?than?blocksize?are?shortened
????????}
????????if?（length（key）?????????????//?keys?shorter?than?blocksize?are?zero-padded?（where?∥?is?concatenation）
????????????key?=?key?∥?[0x00?*?（blocksize?-?length（key））]?//?Where?*?is?repetition.
????????}

????????o_key_pad?=?[0x5c?*?blocksize]?⊕?key?//?Where?blocksize?is?that?of?the?underlying?hash?function
????????i_key_pad?=?[0x36?*?blocksize]?⊕?key?//?Where?⊕?is?exclusive?or?（XOR）

????????return?hash（o_key_pad?∥?hash（i_key_pad?∥?message））?//?Where?∥?is?concatenation
????}
********************************************************************/

#include?
#include?“hmac_sha256.h“
#include?“sha256.h“

/*?常量?*/
#define?B?64	????????????????//?明文分塊長度?byte
#define?I_PAD?0x36	????????????//?內部填充
#define?O_PAD?0x5C	????????????//?外部填充
#define?KEY_IOPAD_SIZE?64???????//?填充字串長度?byte
#define?SHA256_DIGEST_SIZE?32	//?SHA-256摘要輸出大小?32-byte

/*?帶符號整數類型?*/
typedef???signed??????????char?int8_t;
typedef???signed?short?????int?int16_t;
typedef???signed???????????int?int32_t;

/*?無符號整數類型?*/
typedef?unsigned??????????char?uint8_t;
typedef?unsigned?short?????int?uint16_t;
typedef?unsigned???????????int?uint32_t;


/********************************************************************
?*?將無符號?4-bit?二進制數據表示為十六進制形式.
?*?如?{1010}?將轉換為?{‘A‘}.
?*
?*?參數說明:
?*??hb:?????????32-byte?摘要信息
?*?返回值:
?*??以?ASCII碼?表示的十六進制數?[0-9A-F]
?********************************************************************/
char?bin2hex（unsigned?char?hb）
{
????hb?=?hb?&?0xF;
????return?（char）（hb?}

/********************************************************************
?*?將?256-bit?摘要信息?轉換為?64位?char數組?每位字符表示一個十六進制數.
?*?如?{0x5C?0x5C?...??0x5C}?將轉化為?{‘5‘?‘C‘?‘5‘?‘C‘?...??‘5‘?‘C‘}.
?*
?*?參數說明:
?*??digest:?????32-byte?摘要信息
?*??digest_hex:?出參?轉換后的?64位?字符?每位表示一個十六進制數?以?ASCII碼?形式存儲
?********************************************************************/
void?digest2hex（unsigned?char?digest[HMAC_SHA256_DIGEST_SIZE]?
????char?digest_hex[HMAC_SHA256_DIGEST_SIZE*2]）
{
????for?（int?i?=?0;?i?????????digest_hex[i?*?2]?=?bin2hex（digest[i]?>>?4）;
????????digest_hex[i?*?2?+?1]?=?bin2hex（digest[i]）;
????}
}

/********************************************************************
?*?HMAC-SHA256?摘要生成算法：
?*??HMAC-SHA256（K?M）?==?SHA256（（K?^?opad）?∥?SHA256（（K?^?ipad）?∥?M））
?*	????K:??????密鑰
?*??????M:??????消息
?*	????ipad:???內部填充字符串
?*	????opad:???外部填充字符串
?*??????∥:??????數據連接操作
?*
?*	函數參數：
?*??????digest:?出參?輸出?32-byte?加密結果
?*	????msg:????要加密的數據
?*??????msgLen:?數據長度
?*??????key:????加密因子
?*??????keyLen:?加密因子長度
?********************************************************************/
void?hmac_sha256（unsigned?ch

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????2283??2020-03-10?22:43??sha256.h

?????文件???????2503??2020-03-12?08:28??Test.cpp

?????文件???????5191??2020-03-12?05:43??hmac_sha256.c

?????文件???????1395??2020-03-12?05:44??hmac_sha256.h

?????文件???????9604??2020-03-12?03:30??sha256.c

-----------?---------??----------?-----??----

????????????????20976????????????????????5