ctypes_libsodium.py 文件源码

def load_libsodium():
    global loaded, libsodium, buf

    from ctypes.util import find_library
    for p in ('sodium',):
        libsodium_path = find_library(p)
        if libsodium_path:
            break
    else:
        raise Exception('libsodium not found')
    logging.info('loading libsodium from %s', libsodium_path)
    libsodium = CDLL(libsodium_path)
    libsodium.sodium_init.restype = c_int
    libsodium.crypto_stream_salsa20_xor_ic.restype = c_int
    libsodium.crypto_stream_salsa20_xor_ic.argtypes = (c_void_p, c_char_p,
                                                       c_ulonglong,
                                                       c_char_p, c_ulonglong,
                                                       c_char_p)
    libsodium.crypto_stream_chacha20_xor_ic.restype = c_int
    libsodium.crypto_stream_chacha20_xor_ic.argtypes = (c_void_p, c_char_p,
                                                        c_ulonglong,
                                                        c_char_p, c_ulonglong,
                                                        c_char_p)

    libsodium.sodium_init()

    buf = create_string_buffer(buf_size)
    loaded = True