58 lines
1.2 KiB
C++
58 lines
1.2 KiB
C++
#include "./opensslrandomdevice.h"
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#include "../io/cryptoexception.h"
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#include <c++utilities/conversion/binaryconversion.h>
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#include <openssl/err.h>
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#include <openssl/rand.h>
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#include <string>
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using namespace std;
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namespace Util {
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/*!
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* \class OpenSslRandomDevice
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* \brief Provides a random device using the OpenSSL function RAND_bytes().
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*/
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/*!
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* \brief Constructs a new random device.
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*/
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OpenSslRandomDevice::OpenSslRandomDevice()
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{
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}
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/*!
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* \brief Generates a new random number.
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*/
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OpenSslRandomDevice::result_type OpenSslRandomDevice::operator()() const
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{
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unsigned char buf[4];
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if (RAND_bytes(buf, sizeof(buf))) {
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return ConversionUtilities::LE::toUInt32(reinterpret_cast<char *>(buf));
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}
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// handle error case
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string errorMsg;
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while (unsigned long errorCode = ERR_get_error()) {
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if (!errorMsg.empty()) {
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errorMsg += '\n';
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}
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errorMsg += ERR_error_string(errorCode, nullptr);
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errorCode = ERR_get_error();
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}
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throw Io::CryptoException(move(errorMsg));
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}
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/*!
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* \brief Returns the status.
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*/
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bool OpenSslRandomDevice::status() const
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{
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return RAND_status();
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}
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} // namespace Util
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