ctypes_openssl.py 文件源码

def load_openssl():
    global loaded, libcrypto, buf

    from ctypes.util import find_library
    for p in ('crypto', 'eay32', 'libeay32'):
        libcrypto_path = find_library(p)
        if libcrypto_path:
            break
    else:
        raise Exception('libcrypto(OpenSSL) not found')
    logging.info('loading libcrypto from %s', libcrypto_path)
    libcrypto = CDLL(libcrypto_path)
    libcrypto.EVP_get_cipherbyname.restype = c_void_p
    libcrypto.EVP_CIPHER_CTX_new.restype = c_void_p

    libcrypto.EVP_CipherInit_ex.argtypes = (c_void_p, c_void_p, c_char_p,
                                            c_char_p, c_char_p, c_int)

    libcrypto.EVP_CipherUpdate.argtypes = (c_void_p, c_void_p, c_void_p,
                                           c_char_p, c_int)

    libcrypto.EVP_CIPHER_CTX_cleanup.argtypes = (c_void_p,)
    libcrypto.EVP_CIPHER_CTX_free.argtypes = (c_void_p,)
    if hasattr(libcrypto, 'OpenSSL_add_all_ciphers'):
        libcrypto.OpenSSL_add_all_ciphers()

    buf = create_string_buffer(buf_size)
    loaded = True