/*??sha1.c??*/
/*??以下所用各種參量名稱皆為sha-1在出版物上所用之公用名稱??*/
?#include?“sha1.h“

/*
?*??以下是為?SHA1?向左環形移位宏?之定義
?*/
#define?SHA1CircularShift（bitsword）?\
????????????????（（（word）?<>?（32-（bits））））


/*?局部函數原型?*/
void?SHA1PadMessage（SHA1Context?*）;????/*??定義填充信息指針??*/
void?SHA1ProcessMessageBlock（SHA1Context?*）;

/*
?*??SHA1Reset
?*??
?*??以下為數據初始化之操作
?*??Parameters:（參數設置）
?*??context:?[in/out]
?*??The?context?to?reset.
?*
?*/
int?SHA1Reset（SHA1Context?*context）
{
????if?（!context）
????{
????????return?shaNull;
????}

????context->Length_Low?????????????=?0;
????context->Length_High????????????=?0;
????context->Message_Block_Index????=?0;

????context->Intermediate_Hash[0]???=?0x67452301;
????context->Intermediate_Hash[1]???=?0xEFCDAB89;
????context->Intermediate_Hash[2]???=?0x98BADCFE;
????context->Intermediate_Hash[3]???=?0x10325476;
????context->Intermediate_Hash[4]???=?0xC3D2E1F0;

????context->Computed???=?0;
????context->Corrupted??=?0;
????return?shaSuccess;
}

/*
?*??SHA1Result
?*
?*??以下為sha-1結果描述：
?*:
?*??該算法將會返回一個160比特的消息摘要隊列
?*
?*??或者輸出計算錯誤
?*
?*/
int?SHA1Result（?SHA1Context?*context
????????????????uint8_t?Message_Digest[SHA1HashSize]）
{
????int?i;

????if?（!context?||?!Message_Digest）
????{
????????return?shaNull;
????}

????if?（context->Corrupted）
????{
????????return?context->Corrupted;
????}

????if?（!context->Computed）
????{
????????SHA1PadMessage（context）;
????????for（i=0;?i<64;?++i）
????????{
????????????/*?消息清零?*/
????????????context->Message_Block[i]?=?0;
????????}
????????context->Length_Low?=?0;????/*?長度清零?*/
????????context->Length_High?=?0;
????????context->Computed?=?1;
????}

????for（i?=?0;?i?????{
????????Message_Digest[i]?=?context->Intermediate_Hash[i>>2]
????????????????????????????>>?8?*?（?3?-?（?i?&?0x03?）?）;
????}

????return?shaSuccess;
}

/*
?*??以下為sha-1輸入描述：
?*
?*??接收單位長度為8字節倍數的消息
?*
?*/
int?SHA1Input（????SHA1Context????*context
??????????????????const?uint8_t??*message_array
??????????????????unsigned???????length）
{
????if?（!length）
????{
????????return?shaSuccess;
????}

????if?（!context?||?!message_array）
????{
????????return?shaNull;
????}

????if?（context->Computed）
????{
????????context->Corrupted?=?shaStateError;
????????return?shaStateError;
????}

????if?（context->Corrupted）
????{
?????????return?context->Corrupted;
????}
????while（length--?&&?!context->Corrupted）
????{
????context->Message_Block[context->Message_Block_Index++]?=
????????????????????（*message_array?&?0xFF）;

????context->Length_Low?+=?8;
????if?（context->Length_Low?==?0）
????{
????????context->Length_High++;
????????if?（context->Length_High?==?0）
????????{
????????????/*?Message?is?too?long?*/
????????????context->Corrupted?=?1;
????????}
????}

????if?（context->Message_Block_Index?==?64）
????{
????????SHA1ProcessMessageBlock（context）;
????}

????message_array+

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

?????文件???????7178??2009-04-25?17:27??sha1\sha1.c

?????文件???????1277??2009-05-12?10:24??sha1\sha1.h

?????文件???????3246??2009-05-12?10:28??sha1\sha1test.c

?????文件???????7036??2009-05-12?10:27??sha1\stdint.h

?????目錄??????????0??2010-04-10?12:24??sha1

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

????????????????18737????????????????????5