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/*******************************************************************************************
* 說(shuō) 明：此處實(shí)現(xiàn)的SHA256算法中字符串的位長(zhǎng)度并不是任意長(zhǎng)度（0~2^64）的，而是在0~2^32.
***********************************************************************************************/
#include<stddef.h>
#include<stdio.h>
/*算法規(guī)定的函數(shù)或宏*/
#define SHR(x,n) ((x)>>(n))
#define ROTR(x,n) (((x)>>(n)) | ((x)<<(32-(n))))
#define CH(sha256_a,sha256_b,sha256_c) (((sha256_a)&(sha256_b)) ^ ((~sha256_a)&(sha256_c)))
#define MAJ(sha256_a,sha256_b,sha256_c) (((sha256_a)&(sha256_b)) ^ ((sha256_a)&(sha256_c)) ^ ((sha256_b)&(sha256_c)))
#define E0(x) (ROTR((x),2) ^ ROTR((x),13) ^ ROTR((x),22))
#define E1(x) (ROTR((x),6) ^ ROTR((x),11) ^ ROTR((x),25))
#define Q0(x) (ROTR((x),7) ^ ROTR((x),18) ^ SHR((x),3))
#define Q1(x) (ROTR((x),17) ^ ROTR((x),19) ^ SHR((x),10))
unsigned long sha256_hh[8];//sha256碼暫存器
unsigned long sha256_a,sha256_b,sha256_c,sha256_d,sha256_e,sha256_f,sha256_g,sha256_h;//中間變量
unsigned long sha256_w[64];//工作暫存器
unsigned long sha256_K[64]=
{
0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
};//原算法規(guī)定的常量
/***********************************************************************************************
* 函數(shù)名稱：unsigned long sha256_GetStrLen(unsigned char* ptr)
* 功能：獲取字符串的字節(jié)長(zhǎng)度
* 參數(shù)：字符串指針--ptr
* 返回值：字符串長(zhǎng)度
***********************************************************************************************/
unsigned long sha256_GetStrLen(unsigned char* ptr)
{
unsigned char* pTmp;
unsigned long len=0;
pTmp=ptr;
while(pTmp!=NULL&&(*pTmp!='\0'))
{
len++;
pTmp++;
}
return len;
}
/***********************************************************************************************
* 函數(shù)名稱：void sha256_AddBitLen(unsigned long blen)
* 功能：在工作暫存區(qū)末尾添加字符串位長(zhǎng)度信息
***********************************************************************************************/
void sha256_AddBitLen(unsigned long blen)
{
sha256_w[14]=0x00000000;
sha256_w[15]=blen;
}
/***********************************************************************************************
* 函數(shù)名稱：void sha256_ByteToWord(unsigned char* ptr,unsigned char n)
* 功能：將以字節(jié)（8位）為單位存儲(chǔ)的字符串轉(zhuǎn)換成以字（32位）為單位存儲(chǔ)。
* 參數(shù)：轉(zhuǎn)換的字的個(gè)數(shù)--n 字符串指針--*ptr
***********************************************************************************************/
void sha256_ByteToWord(unsigned char* ptr,unsigned char n)
{
unsigned char* pTmp;
unsigned char i,j;
pTmp=ptr;
for(i=0;i<n;i++)
{
sha256_w[i]=0;
for(j=0;j<4;j++)
{
sha256_w[i]<<=8;
sha256_w[i]+=*pTmp;
pTmp++;
}
}
}
/***********************************************************************************************
* 函數(shù)名稱：void sha256_ClearW()
* 功能：清除工作暫存器區(qū)
***********************************************************************************************/
void sha256_ClearW()
{
unsigned char i;
for(i=0;i<64;i++)
{
sha256_w[i]=0x00000000;
}
}
/***********************************************************************************************
* 函數(shù)名稱：void sha256_ProChunk()
* 功能：處理一個(gè)數(shù)據(jù)塊（512位）
***********************************************************************************************/
void sha256_ProChunk()
{
short i;
unsigned long t1,t2;
//步驟一
for(i=0;i<64;i++)
{
if(0<=i&&i<=15)
{
}
if(16<=i&&i<=63)
{
sha256_w[i]=Q1(sha256_w[i-2])+sha256_w[i-7]+Q0(sha256_w[i-15])+sha256_w[i-16];
}
}
//步驟二
sha256_a=sha256_hh[0];
sha256_b=sha256_hh[1];
sha256_c=sha256_hh[2];
sha256_d=sha256_hh[3];
sha256_e=sha256_hh[4];
sha256_f=sha256_hh[5];
sha256_g=sha256_hh[6];
sha256_h=sha256_hh[7];
//步驟三
for(i=0;i<64;i++)
{
t1=sha256_h+E1(sha256_e)+CH(sha256_e,sha256_f,sha256_g)+sha256_K[i]+sha256_w[i];
t2=E0(sha256_a)+MAJ(sha256_a,sha256_b,sha256_c);
sha256_h=sha256_g;
sha256_g=sha256_f;
sha256_f=sha256_e;
sha256_e=sha256_d+t1;
sha256_d=sha256_c;
sha256_c=sha256_b;
sha256_b=sha256_a;
sha256_a=t1+t2;
}
//步驟四
sha256_hh[0] += sha256_a;
sha256_hh[1] += sha256_b;
sha256_hh[2] += sha256_c;
sha256_hh[3] += sha256_d;
sha256_hh[4] += sha256_e;
sha256_hh[5] += sha256_f;
sha256_hh[6] += sha256_g;
sha256_hh[7] += sha256_h;
}
/***********************************************************************************************
* 函數(shù)名稱：void sha256_Display()
* 功能：輸出sha256碼
***********************************************************************************************/
void sha256_Display()
{
// printf("%0lx%0lx%0lx%0lx%0lx%0lx%0lx%0lx\n",sha256_hh[0],sha256_hh[1],sha256_hh[2],sha256_hh[3],sha256_hh[4],sha256_hh[5],sha256_hh[6],sha256_hh[7]);
}
/***********************************************************************************************
* 函數(shù)名稱：void sha256(unsigned char* ptr)
* 功能：計(jì)算給定的字符串的sha256值
* 參數(shù)：字符串
***********************************************************************************************/
void SHA256_Test(unsigned char* ptr)//因?yàn)槭欠菢?biāo)版，所以輸入必須為8字節(jié)的倍數(shù)
{
unsigned char* pTmp;
unsigned long len,len1;//len--待處理的字符串長(zhǎng)度;len1--字符串的長(zhǎng)度
unsigned char m,n;
pTmp=ptr;
//sha256碼初始化
sha256_hh[0] = 0x6a09e667;
sha256_hh[1] = 0xbb67ae85;
sha256_hh[2] = 0x3c6ef372;
sha256_hh[3] = 0xa54ff53a;
sha256_hh[4] = 0x510e527f;
sha256_hh[5] = 0x9b05688c;
sha256_hh[6] = 0x1f83d9ab;
sha256_hh[7] = 0x5be0cd19;
len=sha256_GetStrLen(pTmp);//獲取長(zhǎng)度
len1=len;
//段0：處理不需要補(bǔ)位的數(shù)據(jù)塊
while(len/64)
{
sha256_ClearW();//工作暫存區(qū)清零，w[16..63]的值不為零的話會(huì)發(fā)生錯(cuò)誤。
sha256_ByteToWord(pTmp,64);//將一個(gè)64字節(jié)的數(shù)據(jù)塊轉(zhuǎn)換為16個(gè)字并存入工作暫存器w[0..15]。
sha256_ProChunk();//數(shù)據(jù)塊處理
pTmp+=64;//指針指向下一個(gè)數(shù)據(jù)塊
len-=64;//待處理的字符串長(zhǎng)度減64
}
//段0結(jié)束
m=len/4;
n=len%4;
sha256_ClearW();
sha256_ByteToWord(pTmp,m);
switch(n)
{
case 0:
sha256_w[m]=0x80000000;
break;
case 1:
sha256_w[m]=*pTmp;
sha256_w[m]<<=24;
sha256_w[m]|=0x00800000;
break;
case 2:
sha256_w[m]=*pTmp;
sha256_w[m]<<=8;
pTmp++;
sha256_w[m]+=*pTmp;
sha256_w[m]<<=16;
sha256_w[m]|=0x00008000;
case 3:
sha256_w[m]=*pTmp;
sha256_w[m]<<=8;
pTmp++;
sha256_w[m]+=*pTmp;
sha256_w[m]<<=8;
pTmp++;
sha256_w[m]+=*pTmp;
sha256_w[m]<<=8;
sha256_w[m]|=0x00000080;
default:;
}
if((len1%64)>=56)
{
sha256_ProChunk();
sha256_ClearW();
}
sha256_AddBitLen(len1*8);
sha256_ProChunk();
sha256_Display();//結(jié)果輸出
}

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