Function SHA256

lib/base/tlsutility.cpp:973–1011

}

String SHA256(const String& s)
{
	char errbuf[256];
	SHA256_CTX context;
	unsigned char digest[SHA256_DIGEST_LENGTH];

	if (!SHA256_Init(&context)) {
		ERR_error_string_n(ERR_peek_error(), errbuf, sizeof errbuf);
		Log(LogCritical, "SSL")
			<< "Error on SHA256 Init: " << ERR_peek_error() << ", \"" << errbuf << "\"";
		BOOST_THROW_EXCEPTION(openssl_error()
			<< boost::errinfo_api_function("SHA256_Init")
			<< errinfo_openssl_error(ERR_peek_error()));
	}

	if (!SHA256_Update(&context, (unsigned char*)s.CStr(), s.GetLength())) {
		ERR_error_string_n(ERR_peek_error(), errbuf, sizeof errbuf);
		Log(LogCritical, "SSL")
			<< "Error on SHA256 Update: " << ERR_peek_error() << ", \"" << errbuf << "\"";
		BOOST_THROW_EXCEPTION(openssl_error()
			<< boost::errinfo_api_function("SHA256_Update")
			<< errinfo_openssl_error(ERR_peek_error()));
	}

	if (!SHA256_Final(digest, &context)) {
		ERR_error_string_n(ERR_peek_error(), errbuf, sizeof errbuf);
		Log(LogCritical, "SSL")
			<< "Error on SHA256 Final: " << ERR_peek_error() << ", \"" << errbuf << "\"";
		BOOST_THROW_EXCEPTION(openssl_error()
			<< boost::errinfo_api_function("SHA256_Final")
			<< errinfo_openssl_error(ERR_peek_error()));
	}

	char output[SHA256_DIGEST_LENGTH*2+1];
	for (int i = 0; i < 32; i++)
		sprintf(output + 2 * i, "%02x", digest[i]);

	return output;
}

String RandomString(int length)
{