Create SHA1 with Boost

main.cpp

#include <boost/uuid/detail/sha1.hpp>
#include <iomanip>
#include <iostream>
#include <sstream>

std::string sha1(const std::string& input) {
	boost::uuids::detail::sha1 sha1;
	sha1.process_bytes(input.data(), input.size());
	unsigned int digest[5];
	sha1.get_digest(digest);
	std::ostringstream hash;
	hash << std::hex << std::setfill('0');
	for (size_t i = 0; i < 5; ++i) {
		// Swap byte order because of Little Endian
		const char* tmp = reinterpret_cast<char*>(digest);
		hash << std::setw(2) << static_cast<int>(static_cast<uint8_t>(tmp[i * 4 + 3]))
		     << std::setw(2) << static_cast<int>(static_cast<uint8_t>(tmp[i * 4 + 2]))
		     << std::setw(2) << static_cast<int>(static_cast<uint8_t>(tmp[i * 4 + 1]))
		     << std::setw(2) << static_cast<int>(static_cast<uint8_t>(tmp[i * 4]));
	}
	return hash.str();
}

int main() {
	std::cout << sha1("hello world") << std::endl;
	// output: 2aae6c35c94fcfb415dbe95f408b9ce91ee846ed
}