Function cryptoErrStr

plugins/experimental/access_control/utils.cc:173–187

* @brief a helper function to get a human-readable error message in a buffer. * * @param buffer pointer to a char buffer * @param bufferLen - max buffer length (length should be >= 256) * @return buffer, filled with the error message (null-terminated) */

 * @return buffer, filled with the error message (null-terminated)
 */
static char *
cryptoErrStr(char *buffer, size_t bufferLen)
{
  /* man ERR_error_string expects 256-byte buffer */
  if (nullptr == buffer || 256 > bufferLen) {
    return nullptr;
  }
  unsigned long err = ERR_get_error();
  if (0 == err) {
    buffer[0] = 0;
    return buffer;
  }
  ERR_error_string_n(err, buffer, bufferLen);
  return buffer;
}

/**
 * @brief Calculate message digest