Esempio n. 1
0
def crypto_pwhash_str_alg(passwd, opslimit, memlimit, alg):
    """
    Derive a cryptographic key using the ``passwd`` given as input
    and a random ``salt``, returning a string representation which
    includes the salt, the tuning parameters and the used algorithm.

    :param passwd: The input password
    :type passwd: bytes
    :param opslimit: computational cost
    :type opslimit: int
    :param memlimit: memory cost
    :type memlimit: int
    :param alg: The algorithm to use
    :type alg: int
    :return: serialized derived key and parameters
    :rtype: bytes
    """
    ensure(isinstance(opslimit, integer_types), raising=TypeError)
    ensure(isinstance(memlimit, integer_types), raising=TypeError)
    ensure(isinstance(passwd, bytes), raising=TypeError)

    _check_argon2_limits_alg(opslimit, memlimit, alg)

    outbuf = ffi.new("char[]", 128)

    ret = lib.crypto_pwhash_str_alg(outbuf, passwd, len(passwd), opslimit,
                                    memlimit, alg)

    ensure(ret == 0,
           'Unexpected failure in key derivation',
           raising=exc.RuntimeError)

    return ffi.string(outbuf)
Esempio n. 2
0
def crypto_pwhash_str_alg(passwd, opslimit, memlimit, alg):
    """
    Derive a cryptographic key using the ``passwd`` given as input
    and a random ``salt``, returning a string representation which
    includes the salt, the tuning parameters and the used algorithm.

    :param passwd: The input password
    :type passwd: bytes
    :param opslimit: computational cost
    :type opslimit: int
    :param memlimit: memory cost
    :type memlimit: int
    :param alg: The algorithm to use
    :type alg: int
    :return: serialized derived key and parameters
    :rtype: bytes
    """
    ensure(isinstance(opslimit, integer_types),
           raising=TypeError)
    ensure(isinstance(memlimit, integer_types),
           raising=TypeError)
    ensure(isinstance(passwd, bytes),
           raising=TypeError)

    _check_argon2_limits_alg(opslimit, memlimit, alg)

    outbuf = ffi.new("char[]", 128)

    ret = lib.crypto_pwhash_str_alg(outbuf, passwd, len(passwd),
                                    opslimit, memlimit, alg)

    ensure(ret == 0, 'Unexpected failure in key derivation',
           raising=exc.RuntimeError)

    return ffi.string(outbuf)