How to use the asn1crypto.util.int_to_bytes function in asn1crypto

blob += fill_width(private_exponent, len(modulus))

        elif algo == 'dsa':
            if key_type == 'public':
                blob_type = BcryptConst.BCRYPT_DSA_PUBLIC_BLOB
                public_key = key_info['public_key'].parsed.native
                params = key_info['algorithm']['parameters']
            else:
                blob_type = BcryptConst.BCRYPT_DSA_PRIVATE_BLOB
                public_key = key_info.public_key.native
                private_bytes = int_to_bytes(key_info['private_key'].parsed.native)
                params = key_info['private_key_algorithm']['parameters']

            public_bytes = int_to_bytes(public_key)
            p = int_to_bytes(params['p'].native)
            g = int_to_bytes(params['g'].native)
            q = int_to_bytes(params['q'].native)

            if key_info.bit_size > 1024:
                q_len = len(q)
            else:
                q_len = 20

            key_width = max(len(public_bytes), len(g), len(p))

            public_bytes = fill_width(public_bytes, key_width)
            p = fill_width(p, key_width)
            g = fill_width(g, key_width)
            q = fill_width(q, q_len)
            # We don't know the count or seed, so we set them to the max value
            # since setting them to 0 results in a parameter error
            count = b'\xff' * 4

The X coordinate, as an integer

        :param y:
            The Y coordinate, as an integer

        :return:
            An ECPoint object
        """

        x_bytes = int(math.ceil(math.log(x, 2) / 8.0))
        y_bytes = int(math.ceil(math.log(y, 2) / 8.0))

        num_bytes = max(x_bytes, y_bytes)

        byte_string = b'\x04'
        byte_string += int_to_bytes(x, width=num_bytes)
        byte_string += int_to_bytes(y, width=num_bytes)

        return cls(byte_string)

original_hmac = hmac.new(password, None, algo)

    int_pack = struct.Struct(b'>I').pack

    output = b''
    for block in range(1, blocks + 1):
        prf = original_hmac.copy()
        prf.update(salt + int_pack(block))
        last = prf.digest()
        u = int_from_bytes(last)
        for _ in range(2, iterations + 1):
            prf = original_hmac.copy()
            prf.update(last)
            last = prf.digest()
            u ^= int_from_bytes(last)
        t = int_to_bytes(u)
        output += t

    return output[0:key_length]

len(value)
                ))
            value += '0' * (size - len(value))
        else:
            size = len(value)

        size_mod = size % 8
        extra_bits = 0
        if size_mod != 0:
            extra_bits = 8 - size_mod
            value += '0' * extra_bits

        size_in_bytes = int(math.ceil(size / 8))

        if extra_bits:
            extra_bits_byte = int_to_bytes(extra_bits)
        else:
            extra_bits_byte = b'\x00'

        if value == '':
            value_bytes = b''
        else:
            value_bytes = int_to_bytes(int(value, 2))
        if len(value_bytes) != size_in_bytes:
            value_bytes = (b'\x00' * (size_in_bytes - len(value_bytes))) + value_bytes

        self.contents = extra_bits_byte + value_bytes
        self._header = None
        if self._trailer != b'':
            self._trailer = b''

('public', 'secp384r1'): BcryptConst.BCRYPT_ECDSA_PUBLIC_P384_MAGIC,
                ('public', 'secp521r1'): BcryptConst.BCRYPT_ECDSA_PUBLIC_P521_MAGIC,
                ('private', 'secp256r1'): BcryptConst.BCRYPT_ECDSA_PRIVATE_P256_MAGIC,
                ('private', 'secp384r1'): BcryptConst.BCRYPT_ECDSA_PRIVATE_P384_MAGIC,
                ('private', 'secp521r1'): BcryptConst.BCRYPT_ECDSA_PRIVATE_P521_MAGIC,
            }[(key_type, curve_name)]

            key_width = {
                'secp256r1': 32,
                'secp384r1': 48,
                'secp521r1': 66
            }[curve_name]

            x, y = public_key.to_coords()

            x_bytes = int_to_bytes(x)
            y_bytes = int_to_bytes(y)

            x_bytes = fill_width(x_bytes, key_width)
            y_bytes = fill_width(y_bytes, key_width)

            blob_struct.dwMagic = magic
            blob_struct.cbKey = key_width

            blob = struct_bytes(blob_struct_pointer) + x_bytes + y_bytes
            if key_type == 'private':
                blob += fill_width(private_bytes, key_width)

        key_handle_pointer = new(bcrypt, 'BCRYPT_KEY_HANDLE *')
        res = bcrypt.BCryptImportKeyPair(
            alg_handle,
            null(),

:raises:
            ValueError - when an invalid value is passed
        """

        if not isinstance(value, int_types):
            raise TypeError(unwrap(
                '''
                %s value must be an integer, not %s
                ''',
                type_name(self),
                type_name(value)
            ))

        self._native = value
        # Set the unused bits to 0
        self.contents = b'\x00' + int_to_bytes(value, signed=True)
        self._header = None
        if self._trailer != b'':
            self._trailer = b''

('public', 'secp521r1'): BcryptConst.BCRYPT_ECDSA_PUBLIC_P521_MAGIC,
                ('private', 'secp256r1'): BcryptConst.BCRYPT_ECDSA_PRIVATE_P256_MAGIC,
                ('private', 'secp384r1'): BcryptConst.BCRYPT_ECDSA_PRIVATE_P384_MAGIC,
                ('private', 'secp521r1'): BcryptConst.BCRYPT_ECDSA_PRIVATE_P521_MAGIC,
            }[(key_type, curve_name)]

            key_width = {
                'secp256r1': 32,
                'secp384r1': 48,
                'secp521r1': 66
            }[curve_name]

            x, y = public_key.to_coords()

            x_bytes = int_to_bytes(x)
            y_bytes = int_to_bytes(y)

            x_bytes = fill_width(x_bytes, key_width)
            y_bytes = fill_width(y_bytes, key_width)

            blob_struct.dwMagic = magic
            blob_struct.cbKey = key_width

            blob = struct_bytes(blob_struct_pointer) + x_bytes + y_bytes
            if key_type == 'private':
                blob += fill_width(private_bytes, key_width)

        key_handle_pointer = new(bcrypt, 'BCRYPT_KEY_HANDLE *')
        res = bcrypt.BCryptImportKeyPair(
            alg_handle,
            null(),
            blob_type,

elif algo == 'dsa':
            if key_type == 'public':
                blob_type = BcryptConst.BCRYPT_DSA_PUBLIC_BLOB
                public_key = key_info['public_key'].parsed.native
                params = key_info['algorithm']['parameters']
            else:
                blob_type = BcryptConst.BCRYPT_DSA_PRIVATE_BLOB
                public_key = key_info.public_key.native
                private_bytes = int_to_bytes(key_info['private_key'].parsed.native)
                params = key_info['private_key_algorithm']['parameters']

            public_bytes = int_to_bytes(public_key)
            p = int_to_bytes(params['p'].native)
            g = int_to_bytes(params['g'].native)
            q = int_to_bytes(params['q'].native)

            if key_info.bit_size > 1024:
                q_len = len(q)
            else:
                q_len = 20

            key_width = max(len(public_bytes), len(g), len(p))

            public_bytes = fill_width(public_bytes, key_width)
            p = fill_width(p, key_width)
            g = fill_width(g, key_width)
            q = fill_width(q, q_len)
            # We don't know the count or seed, so we set them to the max value
            # since setting them to 0 results in a parameter error
            count = b'\xff' * 4
            seed = b'\xff' * q_len

extra_bits = 0
        if size_mod != 0:
            extra_bits = 8 - size_mod
            value += '0' * extra_bits

        size_in_bytes = int(math.ceil(size / 8))

        if extra_bits:
            extra_bits_byte = int_to_bytes(extra_bits)
        else:
            extra_bits_byte = b'\x00'

        if value == '':
            value_bytes = b''
        else:
            value_bytes = int_to_bytes(int(value, 2))
        if len(value_bytes) != size_in_bytes:
            value_bytes = (b'\x00' * (size_in_bytes - len(value_bytes))) + value_bytes

        self.contents = extra_bits_byte + value_bytes
        self._header = None
        if self._trailer != b'':
            self._trailer = b''

def to_p1363(self):
        """
        Dumps a signature to a byte string compatible with Microsoft's
        BCryptVerifySignature() function.

        :return:
            A byte string compatible with BCryptVerifySignature()
        """

        r_bytes = int_to_bytes(self['r'].native)
        s_bytes = int_to_bytes(self['s'].native)

        int_byte_length = max(len(r_bytes), len(s_bytes))
        r_bytes = fill_width(r_bytes, int_byte_length)
        s_bytes = fill_width(s_bytes, int_byte_length)

        return r_bytes + s_bytes