How to use the oscrypto._asn1.int_to_bytes function in oscrypto

if key_type == 'public':
                blob_type = BcryptConst.BCRYPT_RSAPUBLIC_BLOB
                magic = BcryptConst.BCRYPT_RSAPUBLIC_MAGIC
                parsed_key = key_info['public_key'].parsed
                prime1_size = 0
                prime2_size = 0
            else:
                blob_type = BcryptConst.BCRYPT_RSAFULLPRIVATE_BLOB
                magic = BcryptConst.BCRYPT_RSAFULLPRIVATE_MAGIC
                parsed_key = key_info['private_key'].parsed
                prime1 = int_to_bytes(parsed_key['prime1'].native)
                prime2 = int_to_bytes(parsed_key['prime2'].native)
                exponent1 = int_to_bytes(parsed_key['exponent1'].native)
                exponent2 = int_to_bytes(parsed_key['exponent2'].native)
                coefficient = int_to_bytes(parsed_key['coefficient'].native)
                private_exponent = int_to_bytes(parsed_key['private_exponent'].native)
                prime1_size = len(prime1)
                prime2_size = len(prime2)

            public_exponent = int_to_bytes(parsed_key['public_exponent'].native)
            modulus = int_to_bytes(parsed_key['modulus'].native)

            blob_struct_pointer = struct(bcrypt, 'BCRYPT_RSAKEY_BLOB')
            blob_struct = unwrap(blob_struct_pointer)
            blob_struct.Magic = magic
            blob_struct.BitLength = key_info.bit_size
            blob_struct.cbPublicExp = len(public_exponent)
            blob_struct.cbModulus = len(modulus)
            blob_struct.cbPrime1 = prime1_size
            blob_struct.cbPrime2 = prime2_size

            blob = struct_bytes(blob_struct_pointer) + public_exponent + modulus

blob += fill_width(exponent2, prime2_size)
                blob += fill_width(coefficient, prime1_size)
                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 = _unwrap_private_key_info(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

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 = _unwrap_private_key_info(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

if algo == 'rsa':
            if key_type == 'public':
                blob_type = BcryptConst.BCRYPT_RSAPUBLIC_BLOB
                magic = BcryptConst.BCRYPT_RSAPUBLIC_MAGIC
                parsed_key = key_info['public_key'].parsed
                prime1_size = 0
                prime2_size = 0
            else:
                blob_type = BcryptConst.BCRYPT_RSAFULLPRIVATE_BLOB
                magic = BcryptConst.BCRYPT_RSAFULLPRIVATE_MAGIC
                parsed_key = key_info['private_key'].parsed
                prime1 = int_to_bytes(parsed_key['prime1'].native)
                prime2 = int_to_bytes(parsed_key['prime2'].native)
                exponent1 = int_to_bytes(parsed_key['exponent1'].native)
                exponent2 = int_to_bytes(parsed_key['exponent2'].native)
                coefficient = int_to_bytes(parsed_key['coefficient'].native)
                private_exponent = int_to_bytes(parsed_key['private_exponent'].native)
                prime1_size = len(prime1)
                prime2_size = len(prime2)

            public_exponent = int_to_bytes(parsed_key['public_exponent'].native)
            modulus = int_to_bytes(parsed_key['modulus'].native)

            blob_struct_pointer = struct(bcrypt, 'BCRYPT_RSAKEY_BLOB')
            blob_struct = unwrap(blob_struct_pointer)
            blob_struct.Magic = magic
            blob_struct.BitLength = key_info.bit_size
            blob_struct.cbPublicExp = len(public_exponent)
            blob_struct.cbModulus = len(modulus)
            blob_struct.cbPrime1 = prime1_size
            blob_struct.cbPrime2 = prime2_size

if not isinstance(data, byte_cls):
        raise TypeError(pretty_message(
            '''
            data must be a byte string, not %s
            ''',
            type_name(data)
        ))

    rsa_public_key = certificate_or_public_key.asn1['public_key'].parsed
    transformed_int = pow(
        int_from_bytes(data),
        rsa_public_key['public_exponent'].native,
        rsa_public_key['modulus'].native
    )
    return int_to_bytes(
        transformed_int,
        width=certificate_or_public_key.asn1.byte_size
    )

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 = _unwrap_private_key_info(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

'secp521r1': BcryptConst.BCRYPT_ECDSA_P521_ALGORITHM,
        }[alg_selector]
        alg_handle = open_alg_handle(alg_constant)

        if algo == 'rsa':
            if key_type == 'public':
                blob_type = BcryptConst.BCRYPT_RSAPUBLIC_BLOB
                magic = BcryptConst.BCRYPT_RSAPUBLIC_MAGIC
                parsed_key = key_info['public_key'].parsed
                prime1_size = 0
                prime2_size = 0
            else:
                blob_type = BcryptConst.BCRYPT_RSAFULLPRIVATE_BLOB
                magic = BcryptConst.BCRYPT_RSAFULLPRIVATE_MAGIC
                parsed_key = key_info['private_key'].parsed
                prime1 = int_to_bytes(parsed_key['prime1'].native)
                prime2 = int_to_bytes(parsed_key['prime2'].native)
                exponent1 = int_to_bytes(parsed_key['exponent1'].native)
                exponent2 = int_to_bytes(parsed_key['exponent2'].native)
                coefficient = int_to_bytes(parsed_key['coefficient'].native)
                private_exponent = int_to_bytes(parsed_key['private_exponent'].native)
                prime1_size = len(prime1)
                prime2_size = len(prime2)

            public_exponent = int_to_bytes(parsed_key['public_exponent'].native)
            modulus = int_to_bytes(parsed_key['modulus'].native)

            blob_struct_pointer = struct(bcrypt, 'BCRYPT_RSAKEY_BLOB')
            blob_struct = unwrap(blob_struct_pointer)
            blob_struct.Magic = magic
            blob_struct.BitLength = key_info.bit_size
            blob_struct.cbPublicExp = len(public_exponent)

if key_type == 'private':
                blob += prime1 + prime2
                blob += fill_width(exponent1, prime1_size)
                blob += fill_width(exponent2, prime2_size)
                blob += fill_width(coefficient, prime1_size)
                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 = _unwrap_private_key_info(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)