345 lines
12 KiB
Python
Executable File
345 lines
12 KiB
Python
Executable File
#!/usr/bin/env python3
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"""Generate psa_constant_names_generated.c
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which is included by programs/psa/psa_constant_names.c.
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The code generated by this module is only meant to be used in the context
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of that program.
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An argument passed to this script will modify the output directory where the
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file is written:
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* by default (no arguments passed): writes to programs/psa/
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* OUTPUT_FILE_DIR passed: writes to OUTPUT_FILE_DIR/
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"""
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# Copyright The Mbed TLS Contributors
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# SPDX-License-Identifier: Apache-2.0
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import os
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import sys
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from mbedtls_dev import build_tree
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from mbedtls_dev import macro_collector
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OUTPUT_TEMPLATE = '''\
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/* Automatically generated by generate_psa_constant.py. DO NOT EDIT. */
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static const char *psa_strerror(psa_status_t status)
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{
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switch (status) {
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%(status_cases)s
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default: return NULL;
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}
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}
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static const char *psa_ecc_family_name(psa_ecc_family_t curve)
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{
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switch (curve) {
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%(ecc_curve_cases)s
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default: return NULL;
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}
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}
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static const char *psa_dh_family_name(psa_dh_family_t group)
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{
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switch (group) {
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%(dh_group_cases)s
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default: return NULL;
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}
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}
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static const char *psa_hash_algorithm_name(psa_algorithm_t hash_alg)
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{
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switch (hash_alg) {
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%(hash_algorithm_cases)s
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default: return NULL;
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}
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}
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static const char *psa_ka_algorithm_name(psa_algorithm_t ka_alg)
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{
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switch (ka_alg) {
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%(ka_algorithm_cases)s
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default: return NULL;
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}
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}
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static int psa_snprint_key_type(char *buffer, size_t buffer_size,
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psa_key_type_t type)
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{
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size_t required_size = 0;
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switch (type) {
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%(key_type_cases)s
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default:
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%(key_type_code)s{
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return snprintf(buffer, buffer_size,
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"0x%%04x", (unsigned) type);
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}
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break;
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}
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buffer[0] = 0;
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return (int) required_size;
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}
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#define NO_LENGTH_MODIFIER 0xfffffffflu
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static int psa_snprint_algorithm(char *buffer, size_t buffer_size,
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psa_algorithm_t alg)
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{
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size_t required_size = 0;
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psa_algorithm_t core_alg = alg;
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unsigned long length_modifier = NO_LENGTH_MODIFIER;
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if (PSA_ALG_IS_MAC(alg)) {
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core_alg = PSA_ALG_TRUNCATED_MAC(alg, 0);
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if (alg & PSA_ALG_MAC_AT_LEAST_THIS_LENGTH_FLAG) {
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append(&buffer, buffer_size, &required_size,
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"PSA_ALG_AT_LEAST_THIS_LENGTH_MAC(", 33);
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length_modifier = PSA_MAC_TRUNCATED_LENGTH(alg);
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} else if (core_alg != alg) {
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append(&buffer, buffer_size, &required_size,
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"PSA_ALG_TRUNCATED_MAC(", 22);
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length_modifier = PSA_MAC_TRUNCATED_LENGTH(alg);
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}
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} else if (PSA_ALG_IS_AEAD(alg)) {
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core_alg = PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG(alg);
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if (core_alg == 0) {
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/* For unknown AEAD algorithms, there is no "default tag length". */
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core_alg = alg;
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} else if (alg & PSA_ALG_AEAD_AT_LEAST_THIS_LENGTH_FLAG) {
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append(&buffer, buffer_size, &required_size,
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"PSA_ALG_AEAD_WITH_AT_LEAST_THIS_LENGTH_TAG(", 43);
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length_modifier = PSA_ALG_AEAD_GET_TAG_LENGTH(alg);
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} else if (core_alg != alg) {
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append(&buffer, buffer_size, &required_size,
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"PSA_ALG_AEAD_WITH_SHORTENED_TAG(", 32);
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length_modifier = PSA_ALG_AEAD_GET_TAG_LENGTH(alg);
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}
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} else if (PSA_ALG_IS_KEY_AGREEMENT(alg) &&
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!PSA_ALG_IS_RAW_KEY_AGREEMENT(alg)) {
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core_alg = PSA_ALG_KEY_AGREEMENT_GET_KDF(alg);
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append(&buffer, buffer_size, &required_size,
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"PSA_ALG_KEY_AGREEMENT(", 22);
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append_with_alg(&buffer, buffer_size, &required_size,
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psa_ka_algorithm_name,
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PSA_ALG_KEY_AGREEMENT_GET_BASE(alg));
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append(&buffer, buffer_size, &required_size, ", ", 2);
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}
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switch (core_alg) {
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%(algorithm_cases)s
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default:
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%(algorithm_code)s{
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append_integer(&buffer, buffer_size, &required_size,
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"0x%%08lx", (unsigned long) core_alg);
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}
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break;
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}
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if (core_alg != alg) {
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if (length_modifier != NO_LENGTH_MODIFIER) {
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append(&buffer, buffer_size, &required_size, ", ", 2);
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append_integer(&buffer, buffer_size, &required_size,
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"%%lu", length_modifier);
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}
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append(&buffer, buffer_size, &required_size, ")", 1);
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}
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buffer[0] = 0;
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return (int) required_size;
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}
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static int psa_snprint_key_usage(char *buffer, size_t buffer_size,
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psa_key_usage_t usage)
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{
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size_t required_size = 0;
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if (usage == 0) {
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if (buffer_size > 1) {
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buffer[0] = '0';
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buffer[1] = 0;
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} else if (buffer_size == 1) {
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buffer[0] = 0;
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}
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return 1;
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}
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%(key_usage_code)s
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if (usage != 0) {
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if (required_size != 0) {
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append(&buffer, buffer_size, &required_size, " | ", 3);
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}
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append_integer(&buffer, buffer_size, &required_size,
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"0x%%08lx", (unsigned long) usage);
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} else {
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buffer[0] = 0;
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}
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return (int) required_size;
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}
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/* End of automatically generated file. */
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'''
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KEY_TYPE_FROM_CURVE_TEMPLATE = '''if (%(tester)s(type)) {
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append_with_curve(&buffer, buffer_size, &required_size,
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"%(builder)s", %(builder_length)s,
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PSA_KEY_TYPE_ECC_GET_FAMILY(type));
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} else '''
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KEY_TYPE_FROM_GROUP_TEMPLATE = '''if (%(tester)s(type)) {
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append_with_group(&buffer, buffer_size, &required_size,
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"%(builder)s", %(builder_length)s,
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PSA_KEY_TYPE_DH_GET_FAMILY(type));
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} else '''
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ALGORITHM_FROM_HASH_TEMPLATE = '''if (%(tester)s(core_alg)) {
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append(&buffer, buffer_size, &required_size,
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"%(builder)s(", %(builder_length)s + 1);
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append_with_alg(&buffer, buffer_size, &required_size,
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psa_hash_algorithm_name,
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PSA_ALG_GET_HASH(core_alg));
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append(&buffer, buffer_size, &required_size, ")", 1);
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} else '''
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BIT_TEST_TEMPLATE = '''\
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if (%(var)s & %(flag)s) {
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if (required_size != 0) {
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append(&buffer, buffer_size, &required_size, " | ", 3);
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}
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append(&buffer, buffer_size, &required_size, "%(flag)s", %(length)d);
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%(var)s ^= %(flag)s;
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}\
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'''
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class CaseBuilder(macro_collector.PSAMacroCollector):
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"""Collect PSA crypto macro definitions and write value recognition functions.
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1. Call `read_file` on the input header file(s).
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2. Call `write_file` to write ``psa_constant_names_generated.c``.
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"""
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def __init__(self):
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super().__init__(include_intermediate=True)
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@staticmethod
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def _make_return_case(name):
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return 'case %(name)s: return "%(name)s";' % {'name': name}
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@staticmethod
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def _make_append_case(name):
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template = ('case %(name)s: '
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'append(&buffer, buffer_size, &required_size, "%(name)s", %(length)d); '
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'break;')
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return template % {'name': name, 'length': len(name)}
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@staticmethod
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def _make_bit_test(var, flag):
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return BIT_TEST_TEMPLATE % {'var': var,
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'flag': flag,
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'length': len(flag)}
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def _make_status_cases(self):
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return '\n '.join(map(self._make_return_case,
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sorted(self.statuses)))
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def _make_ecc_curve_cases(self):
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return '\n '.join(map(self._make_return_case,
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sorted(self.ecc_curves)))
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def _make_dh_group_cases(self):
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return '\n '.join(map(self._make_return_case,
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sorted(self.dh_groups)))
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def _make_key_type_cases(self):
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return '\n '.join(map(self._make_append_case,
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sorted(self.key_types)))
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@staticmethod
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def _make_key_type_from_curve_code(builder, tester):
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return KEY_TYPE_FROM_CURVE_TEMPLATE % {'builder': builder,
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'builder_length': len(builder),
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'tester': tester}
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@staticmethod
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def _make_key_type_from_group_code(builder, tester):
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return KEY_TYPE_FROM_GROUP_TEMPLATE % {'builder': builder,
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'builder_length': len(builder),
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'tester': tester}
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def _make_ecc_key_type_code(self):
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d = self.key_types_from_curve
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make = self._make_key_type_from_curve_code
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return ''.join([make(k, d[k]) for k in sorted(d.keys())])
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def _make_dh_key_type_code(self):
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d = self.key_types_from_group
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make = self._make_key_type_from_group_code
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return ''.join([make(k, d[k]) for k in sorted(d.keys())])
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def _make_hash_algorithm_cases(self):
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return '\n '.join(map(self._make_return_case,
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sorted(self.hash_algorithms)))
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def _make_ka_algorithm_cases(self):
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return '\n '.join(map(self._make_return_case,
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sorted(self.ka_algorithms)))
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def _make_algorithm_cases(self):
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return '\n '.join(map(self._make_append_case,
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sorted(self.algorithms)))
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@staticmethod
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def _make_algorithm_from_hash_code(builder, tester):
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return ALGORITHM_FROM_HASH_TEMPLATE % {'builder': builder,
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'builder_length': len(builder),
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'tester': tester}
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def _make_algorithm_code(self):
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d = self.algorithms_from_hash
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make = self._make_algorithm_from_hash_code
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return ''.join([make(k, d[k]) for k in sorted(d.keys())])
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def _make_key_usage_code(self):
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return '\n'.join([self._make_bit_test('usage', bit)
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for bit in sorted(self.key_usage_flags)])
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def write_file(self, output_file):
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"""Generate the pretty-printer function code from the gathered
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constant definitions.
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"""
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data = {}
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data['status_cases'] = self._make_status_cases()
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data['ecc_curve_cases'] = self._make_ecc_curve_cases()
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data['dh_group_cases'] = self._make_dh_group_cases()
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data['key_type_cases'] = self._make_key_type_cases()
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data['key_type_code'] = (self._make_ecc_key_type_code() +
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self._make_dh_key_type_code())
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data['hash_algorithm_cases'] = self._make_hash_algorithm_cases()
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data['ka_algorithm_cases'] = self._make_ka_algorithm_cases()
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data['algorithm_cases'] = self._make_algorithm_cases()
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data['algorithm_code'] = self._make_algorithm_code()
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data['key_usage_code'] = self._make_key_usage_code()
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output_file.write(OUTPUT_TEMPLATE % data)
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def generate_psa_constants(header_file_names, output_file_name):
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collector = CaseBuilder()
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for header_file_name in header_file_names:
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with open(header_file_name, 'rb') as header_file:
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collector.read_file(header_file)
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temp_file_name = output_file_name + '.tmp'
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with open(temp_file_name, 'w') as output_file:
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collector.write_file(output_file)
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os.replace(temp_file_name, output_file_name)
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if __name__ == '__main__':
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build_tree.chdir_to_root()
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# Allow to change the directory where psa_constant_names_generated.c is written to.
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OUTPUT_FILE_DIR = sys.argv[1] if len(sys.argv) == 2 else "programs/psa"
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generate_psa_constants(['include/psa/crypto_values.h',
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'include/psa/crypto_extra.h'],
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OUTPUT_FILE_DIR + '/psa_constant_names_generated.c')
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