opensslrandomdevice.cpp

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#include "./opensslrandomdevice.h"
 
#include "../io/cryptoexception.h"
 
#include <c++utilities/conversion/binaryconversion.h>
 
#include <openssl/err.h>
#include <openssl/rand.h>
 
#include <string>
 
using namespace std;
using namespace CppUtilities;
 
namespace Util {
 
OpenSslRandomDevice::OpenSslRandomDevice()
{
}
 
OpenSslRandomDevice::result_type OpenSslRandomDevice::operator()() const
{
    unsigned char buf[4];
    if (RAND_bytes(buf, sizeof(buf))) {
        return LE::toUInt32(reinterpret_cast<char *>(buf));
    }
 
    // handle error case
    string errorMsg;
    while (unsigned long errorCode = ERR_get_error()) {
        if (!errorMsg.empty()) {
            errorMsg += '\n';
        }
        errorMsg += ERR_error_string(errorCode, nullptr);
        errorCode = ERR_get_error();
    }
    throw Io::CryptoException(std::move(errorMsg));
}
 
bool OpenSslRandomDevice::status() const
{
    return RAND_status();
}
} // namespace Util