How to use the oscrypto._mac._security.Security.SecTransformSetAttribute function in oscrypto

sec_transform = None

    try:
        cf_dict = CFHelpers.cf_dictionary_from_pairs([(Security.kSecAttrKeyType, cipher)])
        cf_key = CFHelpers.cf_data_from_bytes(key)
        cf_data = CFHelpers.cf_data_from_bytes(data)

        error_pointer = new(CoreFoundation, 'CFErrorRef *')
        sec_key = Security.SecKeyCreateFromData(cf_dict, cf_key, error_pointer)
        handle_cf_error(error_pointer)

        sec_transform = Security.SecDecryptTransformCreate(sec_key, error_pointer)
        handle_cf_error(error_pointer)

        if cipher != Security.kSecAttrKeyTypeRC4:
            Security.SecTransformSetAttribute(sec_transform, Security.kSecModeCBCKey, null(), error_pointer)
            handle_cf_error(error_pointer)

            Security.SecTransformSetAttribute(sec_transform, Security.kSecPaddingKey, padding, error_pointer)
            handle_cf_error(error_pointer)

            cf_iv = CFHelpers.cf_data_from_bytes(iv)
            Security.SecTransformSetAttribute(sec_transform, Security.kSecIVKey, cf_iv, error_pointer)
            handle_cf_error(error_pointer)

        Security.SecTransformSetAttribute(
            sec_transform,
            Security.kSecTransformInputAttributeName,
            cf_data,
            error_pointer
        )
        handle_cf_error(error_pointer)

error_pointer = new(CoreFoundation, 'CFErrorRef *')
        sec_key = Security.SecKeyCreateFromData(cf_dict, cf_key, error_pointer)
        handle_cf_error(error_pointer)

        sec_transform = Security.SecDecryptTransformCreate(sec_key, error_pointer)
        handle_cf_error(error_pointer)

        if cipher != Security.kSecAttrKeyTypeRC4:
            Security.SecTransformSetAttribute(sec_transform, Security.kSecModeCBCKey, null(), error_pointer)
            handle_cf_error(error_pointer)

            Security.SecTransformSetAttribute(sec_transform, Security.kSecPaddingKey, padding, error_pointer)
            handle_cf_error(error_pointer)

            cf_iv = CFHelpers.cf_data_from_bytes(iv)
            Security.SecTransformSetAttribute(sec_transform, Security.kSecIVKey, cf_iv, error_pointer)
            handle_cf_error(error_pointer)

        Security.SecTransformSetAttribute(
            sec_transform,
            Security.kSecTransformInputAttributeName,
            cf_data,
            error_pointer
        )
        handle_cf_error(error_pointer)

        plaintext = Security.SecTransformExecute(sec_transform, error_pointer)
        handle_cf_error(error_pointer)

        return CFHelpers.cf_data_to_bytes(plaintext)

    finally:

error_pointer = new(CoreFoundation, 'CFErrorRef *')
        sec_key = Security.SecKeyCreateFromData(cf_dict, cf_key, error_pointer)
        handle_cf_error(error_pointer)

        sec_transform = Security.SecEncryptTransformCreate(sec_key, error_pointer)
        handle_cf_error(error_pointer)

        if cipher != Security.kSecAttrKeyTypeRC4:
            Security.SecTransformSetAttribute(sec_transform, Security.kSecModeCBCKey, null(), error_pointer)
            handle_cf_error(error_pointer)

            Security.SecTransformSetAttribute(sec_transform, Security.kSecPaddingKey, padding, error_pointer)
            handle_cf_error(error_pointer)

            cf_iv = CFHelpers.cf_data_from_bytes(iv)
            Security.SecTransformSetAttribute(sec_transform, Security.kSecIVKey, cf_iv, error_pointer)
            handle_cf_error(error_pointer)

        Security.SecTransformSetAttribute(
            sec_transform,
            Security.kSecTransformInputAttributeName,
            cf_data,
            error_pointer
        )
        handle_cf_error(error_pointer)

        ciphertext = Security.SecTransformExecute(sec_transform, error_pointer)
        handle_cf_error(error_pointer)

        return CFHelpers.cf_data_to_bytes(ciphertext)

    finally:

hash_constant,
            error_pointer
        )
        handle_cf_error(error_pointer)

        if hash_algorithm in set(['sha224', 'sha256', 'sha384', 'sha512']):
            hash_length = {
                'sha224': 224,
                'sha256': 256,
                'sha384': 384,
                'sha512': 512
            }[hash_algorithm]

            cf_hash_length = CFHelpers.cf_number_from_integer(hash_length)

            Security.SecTransformSetAttribute(
                sec_transform,
                Security.kSecDigestLengthAttribute,
                cf_hash_length,
                error_pointer
            )
            handle_cf_error(error_pointer)

        if certificate_or_public_key.algorithm == 'rsa':
            Security.SecTransformSetAttribute(
                sec_transform,
                Security.kSecPaddingKey,
                Security.kSecPaddingPKCS1Key,
                error_pointer
            )
            handle_cf_error(error_pointer)

cf_hash_length,
                error_pointer
            )
            handle_cf_error(error_pointer)

        if private_key.algorithm == 'rsa':
            Security.SecTransformSetAttribute(
                sec_transform,
                Security.kSecPaddingKey,
                Security.kSecPaddingPKCS1Key,
                error_pointer
            )
            handle_cf_error(error_pointer)

        cf_data = CFHelpers.cf_data_from_bytes(data)
        Security.SecTransformSetAttribute(
            sec_transform,
            Security.kSecTransformInputAttributeName,
            cf_data,
            error_pointer
        )
        handle_cf_error(error_pointer)

        cf_signature = Security.SecTransformExecute(sec_transform, error_pointer)
        handle_cf_error(error_pointer)

        return CFHelpers.cf_data_to_bytes(cf_signature)

    finally:
        if sec_transform:
            CoreFoundation.CFRelease(sec_transform)
        if cf_signature:

try:
        error_pointer = new(CoreFoundation, 'CFErrorRef *')
        sec_transform = Security.SecSignTransformCreate(private_key.sec_key_ref, error_pointer)
        handle_cf_error(error_pointer)

        hash_constant = {
            'md5': Security.kSecDigestMD5,
            'sha1': Security.kSecDigestSHA1,
            'sha224': Security.kSecDigestSHA2,
            'sha256': Security.kSecDigestSHA2,
            'sha384': Security.kSecDigestSHA2,
            'sha512': Security.kSecDigestSHA2
        }[hash_algorithm]

        Security.SecTransformSetAttribute(
            sec_transform,
            Security.kSecDigestTypeAttribute,
            hash_constant,
            error_pointer
        )
        handle_cf_error(error_pointer)

        if hash_algorithm in set(['sha224', 'sha256', 'sha384', 'sha512']):
            hash_length = {
                'sha224': 224,
                'sha256': 256,
                'sha384': 384,
                'sha512': 512
            }[hash_algorithm]

            cf_hash_length = CFHelpers.cf_number_from_integer(hash_length)

sec_transform = Security.SecEncryptTransformCreate(sec_key, error_pointer)
        handle_cf_error(error_pointer)

        if cipher != Security.kSecAttrKeyTypeRC4:
            Security.SecTransformSetAttribute(sec_transform, Security.kSecModeCBCKey, null(), error_pointer)
            handle_cf_error(error_pointer)

            Security.SecTransformSetAttribute(sec_transform, Security.kSecPaddingKey, padding, error_pointer)
            handle_cf_error(error_pointer)

            cf_iv = CFHelpers.cf_data_from_bytes(iv)
            Security.SecTransformSetAttribute(sec_transform, Security.kSecIVKey, cf_iv, error_pointer)
            handle_cf_error(error_pointer)

        Security.SecTransformSetAttribute(
            sec_transform,
            Security.kSecTransformInputAttributeName,
            cf_data,
            error_pointer
        )
        handle_cf_error(error_pointer)

        ciphertext = Security.SecTransformExecute(sec_transform, error_pointer)
        handle_cf_error(error_pointer)

        return CFHelpers.cf_data_to_bytes(ciphertext)

    finally:
        if cf_dict:
            CoreFoundation.CFRelease(cf_dict)
        if cf_key: