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#include <string>
#include <openssl/md5.h>
#include <openssl/sha.h>
#include <openssl/crypto.h>
#include <fstream>

//获取SSL版本
const char * getSslVersion() {
   return SSLeay_version(SSLEAY_VERSION);
}

//文件SHA1
std::string fileSha1(const char *filePath) {
 SHA_CTX ctx;
 unsigned char out_value[20] = {0};
 char tmp[3] = {0};
 std::string result;
 int i;

 SHA1_Init(&ctx);

 int bufferLen = 1024;
 char *buffer = new char[bufferLen];

 std::ifstream is(filePath, std::ifstream::binary);
 if (is.is_open()) {
   while (!is.eof()) {
     is.read(buffer, bufferLen);
     size_t count = is.gcount();
     SHA1_Update(&ctx, buffer, count);
   }
 }
 is.close();
 delete[] buffer;

 SHA1_Final(out_value, &ctx);

 //格式化结果
 for (i = 0; i < 20; i++) {
   sprintf(tmp, "%02x", out_value[i]);
   result.append(tmp);
 }

 return result;
}

//字符串的SHA1
std::string strSha1(const char *input, size_t len) {
 SHA_CTX ctx;
 unsigned char out_value[20] = {0};
 char tmp[3] = {0};
 std::string result;
 int i;

 SHA1_Init(&ctx);
 SHA1_Update(&ctx, input, len);
 SHA1_Final(out_value, &ctx);

 for (i = 0; i < 20; i++) {
   sprintf(tmp, "%02x", out_value[i]);
   result.append(tmp);
 }

 return result;
}