sha1.h

//sha1.h：对字符串进行sha1加密  
#ifndef _SHA1_H_  
#define _SHA1_H_  

#include <stdio.h>  
#include <stdlib.h>  
#include <string.h>  


typedef struct SHA1Context{
	unsigned Message_Digest[5];
	unsigned Length_Low;
	unsigned Length_High;
	unsigned char Message_Block[64];
	int Message_Block_Index;
	int Computed;
	int Corrupted;
} SHA1Context;

void SHA1Reset(SHA1Context *);
int SHA1Result(SHA1Context *);
void SHA1Input(SHA1Context *, const char *, unsigned);
#endif  


#define SHA1CircularShift(bits,word) ((((word) << (bits)) & 0xFFFFFFFF) | ((word) >> (32-(bits))))  

void SHA1ProcessMessageBlock(SHA1Context *);
void SHA1PadMessage(SHA1Context *);

void SHA1Reset(SHA1Context *context){// 初始化动作  
	context->Length_Low = 0;
	context->Length_High = 0;
	context->Message_Block_Index = 0;

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

	context->Computed = 0;
	context->Corrupted = 0;
}


int SHA1Result(SHA1Context *context){// 成功返回1，失败返回0  
	if (context->Corrupted) {
		return 0;
	}
	if (!context->Computed) {
		SHA1PadMessage(context);
		context->Computed = 1;
	}
	return 1;
}


void SHA1Input(SHA1Context *context, const char *message_array, unsigned length){
	if (!length) return;

	if (context->Computed || context->Corrupted){
		context->Corrupted = 1;
		return;
	}

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

		context->Length_Low += 8;

		context->Length_Low &= 0xFFFFFFFF;
		if (context->Length_Low == 0){
			context->Length_High++;
			context->Length_High &= 0xFFFFFFFF;
			if (context->Length_High == 0) context->Corrupted = 1;
		}

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

void SHA1ProcessMessageBlock(SHA1Context *context){
	const unsigned K[] = { 0x5A827999, 0x6ED9EBA1, 0x8F1BBCDC, 0xCA62C1D6 };
	int         t;
	unsigned    temp;
	unsigned    W[80];
	unsigned    A, B, C, D, E;

	for (t = 0; t < 16; t++) {
		W[t] = ((unsigned)context->Message_Block[t * 4]) << 24;
		W[t] |= ((unsigned)context->Message_Block[t * 4 + 1]) << 16;
		W[t] |= ((unsigned)context->Message_Block[t * 4 + 2]) << 8;
		W[t] |= ((unsigned)context->Message_Block[t * 4 + 3]);
	}

	for (t = 16; t < 80; t++)  W[t] = SHA1CircularShift(1, W[t - 3] ^ W[t - 8] ^ W[t - 14] ^ W[t - 16]);

	A = context->Message_Digest[0];
	B = context->Message_Digest[1];
	C = context->Message_Digest[2];
	D = context->Message_Digest[3];
	E = context->Message_Digest[4];

	for (t = 0; t < 20; t++) {
		temp = SHA1CircularShift(5, A) + ((B & C) | ((~B) & D)) + E + W[t] + K[0];
		temp &= 0xFFFFFFFF;
		E = D;
		D = C;
		C = SHA1CircularShift(30, B);
		B = A;
		A = temp;
	}
	for (t = 20; t < 40; t++) {
		temp = SHA1CircularShift(5, A) + (B ^ C ^ D) + E + W[t] + K[1];
		temp &= 0xFFFFFFFF;
		E = D;
		D = C;
		C = SHA1CircularShift(30, B);
		B = A;
		A = temp;
	}
	for (t = 40; t < 60; t++) {
		temp = SHA1CircularShift(5, A) + ((B & C) | (B & D) | (C & D)) + E + W[t] + K[2];
		temp &= 0xFFFFFFFF;
		E = D;
		D = C;
		C = SHA1CircularShift(30, B);
		B = A;
		A = temp;
	}
	for (t = 60; t < 80; t++) {
		temp = SHA1CircularShift(5, A) + (B ^ C ^ D) + E + W[t] + K[3];
		temp &= 0xFFFFFFFF;
		E = D;
		D = C;
		C = SHA1CircularShift(30, B);
		B = A;
		A = temp;
	}
	context->Message_Digest[0] = (context->Message_Digest[0] + A) & 0xFFFFFFFF;
	context->Message_Digest[1] = (context->Message_Digest[1] + B) & 0xFFFFFFFF;
	context->Message_Digest[2] = (context->Message_Digest[2] + C) & 0xFFFFFFFF;
	context->Message_Digest[3] = (context->Message_Digest[3] + D) & 0xFFFFFFFF;
	context->Message_Digest[4] = (context->Message_Digest[4] + E) & 0xFFFFFFFF;
	context->Message_Block_Index = 0;
}

void SHA1PadMessage(SHA1Context *context){
	if (context->Message_Block_Index > 55) {
		context->Message_Block[context->Message_Block_Index++] = 0x80;
		while (context->Message_Block_Index < 64)  context->Message_Block[context->Message_Block_Index++] = 0;
		SHA1ProcessMessageBlock(context);
		while (context->Message_Block_Index < 56) context->Message_Block[context->Message_Block_Index++] = 0;
	}
	else {
		context->Message_Block[context->Message_Block_Index++] = 0x80;
		while (context->Message_Block_Index < 56) context->Message_Block[context->Message_Block_Index++] = 0;
	}
	context->Message_Block[56] = (context->Length_High >> 24) & 0xFF;
	context->Message_Block[57] = (context->Length_High >> 16) & 0xFF;
	context->Message_Block[58] = (context->Length_High >> 8) & 0xFF;
	context->Message_Block[59] = (context->Length_High) & 0xFF;
	context->Message_Block[60] = (context->Length_Low >> 24) & 0xFF;
	context->Message_Block[61] = (context->Length_Low >> 16) & 0xFF;
	context->Message_Block[62] = (context->Length_Low >> 8) & 0xFF;
	context->Message_Block[63] = (context->Length_Low) & 0xFF;

	SHA1ProcessMessageBlock(context);
}

/*
int sha1_hash(const char *source, char *lrvar){// Main
SHA1Context sha;
char buf[128];

SHA1Reset(&sha);
SHA1Input(&sha, source, strlen(source));

if (!SHA1Result(&sha)){
printf("SHA1 ERROR: Could not compute message digest");
return -1;
} else {
memset(buf,0,sizeof(buf));
sprintf(buf, "%08X%08X%08X%08X%08X", sha.Message_Digest[0],sha.Message_Digest[1],
sha.Message_Digest[2],sha.Message_Digest[3],sha.Message_Digest[4]);
//lr_save_string(buf, lrvar);

return strlen(buf);
}
}
*/

char * sha1_hash(const char *source){// Main  
	SHA1Context sha;
	char *buf;//[128];  

	SHA1Reset(&sha);
	SHA1Input(&sha, source, strlen(source));

	if (!SHA1Result(&sha)){
		printf("SHA1 ERROR: Could not compute message digest");
		return NULL;
	}
	else {
		buf = (char *)malloc(128);
		memset(buf, 0, 128);
		sprintf_s(buf, 128, "%08X%08X%08X%08X%08X", sha.Message_Digest[0], sha.Message_Digest[1],
			sha.Message_Digest[2], sha.Message_Digest[3], sha.Message_Digest[4]);
		//lr_save_string(buf, lrvar);  

		//return strlen(buf);  
		return buf;
	}
}