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/*
* This file is part of PowerDNS or dnsdist.
* Copyright -- PowerDNS.COM B.V. and its contributors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* In addition, for the avoidance of any doubt, permission is granted to
* link this program with OpenSSL and to (re)distribute the binaries
* produced as the result of such linking.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "base64.hh"
#include <stdexcept>
#include <boost/scoped_array.hpp>
#include <openssl/bio.h>
#include <openssl/evp.h>
int B64Decode(const std::string& src, std::string& dst)
{
if (src.empty() ) {
dst.clear();
return 0;
}
int dlen = ( src.length() * 6 + 7 ) / 8 ;
ssize_t olen = 0;
boost::scoped_array<unsigned char> d( new unsigned char[dlen] );
BIO *bio, *b64;
bio = BIO_new(BIO_s_mem());
BIO_write(bio, src.c_str(), src.length());
b64 = BIO_new(BIO_f_base64());
bio = BIO_push(b64, bio);
BIO_set_flags(bio, BIO_FLAGS_BASE64_NO_NL);
olen = BIO_read(b64, d.get(), dlen);
if ((olen == 0 || olen == -1) && BIO_should_retry(bio)) {
BIO_free_all(bio);
throw std::runtime_error("BIO_read failed to read all data from memory buffer");
}
BIO_free_all(bio);
if (olen > 0) {
dst = std::string( reinterpret_cast<const char*>(d.get()), olen );
return 0;
}
return -1;
}
std::string Base64Encode(const std::string& src)
{
if (!src.empty()) {
size_t olen = 0;
BIO *bio, *b64;
b64 = BIO_new(BIO_f_base64());
bio = BIO_new(BIO_s_mem());
bio = BIO_push(b64, bio);
BIO_set_flags(bio, BIO_FLAGS_BASE64_NO_NL);
int bioWriteRet = BIO_write(bio, src.c_str(), src.length());
if (bioWriteRet < 0 || (size_t) bioWriteRet != src.length()) {
BIO_free_all(bio);
throw std::runtime_error("BIO_write failed to write all data to memory buffer");
}
(void)BIO_flush(bio);
char* pp;
std::string out;
olen = BIO_get_mem_data(bio, &pp);
if (olen > 0) {
out = std::string(pp, olen);
}
BIO_free_all(bio);
return out;
}
return "";
}
#if 0
#include <iostream>
int main() {
std::string in = "PowerDNS Test String 1";
std::string out = Base64Encode(in);
std::cout << out << std::endl;
if (out != "UG93ZXJETlMgVGVzdCBTdHJpbmcgMQ==") {
std::cerr << "output did not match expected data" << std::endl;
}
std::string roundtrip;
B64Decode(out, roundtrip);
std::cout << roundtrip << std::endl;
if (roundtrip != in) {
std::cerr << "roundtripped data did not match input data" << std::endl;
}
return 0;
}
#endif
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