示例#1
0
def configure_trng(config):
    """Initialize the true entropy source from a given Config object.  If
       none is provided, tries some sane defaults."""
    global _TRNG_FILENAME
    global _theTrueRNG

    if sys.platform == 'win32':
        # We have two entropy sources on windows: openssl's built-in
        # entropy generator that takes data from the screen, and
        # Windows's CryptGenRandom function.  Because the former is
        # insecure, and the latter is closed-source, we xor them.
        _ml.win32_openssl_seed()
        _ml.openssl_seed(_ml.win32_get_random_bytes(32))
        _theTrueRNG = _XorRNG(_OpensslRNG(), _WinTrueRNG())
        return

    if config is not None:
        requestedFile = config['Host'].get('EntropySource')
    else:
        requestedFile = None

    # Build a list of candidates
    defaults = PLATFORM_TRNG_DEFAULTS.get(sys.platform,
                                          PLATFORM_TRNG_DEFAULTS['***'])
    files = [requestedFile] + defaults

    # Now find the first of our candidates that exists and is a character
    # device.
    randFile = None
    for filename in files:
        if filename is None:
            continue

        verbose = (filename == requestedFile)
        if not os.path.exists(filename):
            if verbose:
                log.warn("No such file as %s", filename)
        else:
            st = os.stat(filename)
            if not (st[stat.ST_MODE] & stat.S_IFCHR):
                if verbose:
                    log.error("Entropy source %s isn't a character device",
                              filename)
            else:
                randFile = filename
                break

    if randFile is None and _TRNG_FILENAME is None:
        log.critical("No entropy source available: Tried all of %s",
                  files)
        raise MixFatalError("No entropy source available")
    elif randFile is None:
        log.warn("Falling back to previous entropy source %s",
                 _TRNG_FILENAME)
    else:
        log.info("Setting entropy source to %r", randFile)
        _TRNG_FILENAME = randFile
        _theTrueRNG = _TrueRNG(1024)
示例#2
0
def configure_trng(config):
    """Initialize the true entropy source from a given Config object.  If
       none is provided, tries some sane defaults."""
    global _TRNG_FILENAME
    global _theTrueRNG

    if sys.platform == 'win32':
        # We have two entropy sources on windows: openssl's built-in
        # entropy generator that takes data from the screen, and
        # Windows's CryptGenRandom function.  Because the former is
        # insecure, and the latter is closed-source, we xor them.
        _ml.win32_openssl_seed()
        _ml.openssl_seed(_ml.win32_get_random_bytes(32))
        _theTrueRNG = _XorRNG(_OpensslRNG(), _WinTrueRNG())
        return

    if config is not None:
        requestedFile = config['Host'].get('EntropySource')
    else:
        requestedFile = None

    # Build a list of candidates
    defaults = PLATFORM_TRNG_DEFAULTS.get(sys.platform,
                                          PLATFORM_TRNG_DEFAULTS['***'])
    files = [requestedFile] + defaults

    # Now find the first of our candidates that exists and is a character
    # device.
    randFile = None
    for filename in files:
        if filename is None:
            continue

        verbose = (filename == requestedFile)
        if not os.path.exists(filename):
            if verbose:
                LOG.warn("No such file as %s", filename)
        else:
            st = os.stat(filename)
            if not (st[stat.ST_MODE] & stat.S_IFCHR):
                if verbose:
                    LOG.error("Entropy source %s isn't a character device",
                              filename)
            else:
                randFile = filename
                break

    if randFile is None and _TRNG_FILENAME is None:
        LOG.fatal("No entropy source available: Tried all of %s", files)
        raise MixFatalError("No entropy source available")
    elif randFile is None:
        LOG.warn("Falling back to previous entropy source %s", _TRNG_FILENAME)
    else:
        LOG.info("Setting entropy source to %r", randFile)
        _TRNG_FILENAME = randFile
        _theTrueRNG = _TrueRNG(1024)
示例#3
0
 def _prng(self, n):
     return _ml.win32_get_random_bytes(n)
示例#4
0
 def _prng(self, n):
     return _ml.win32_get_random_bytes(n)