Move PSAMacroCollector to a module of its own
This will make it possible to use the class from other scripts.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/scripts/generate_psa_constants.py b/scripts/generate_psa_constants.py
index 64b3c9d..4f8b87b 100755
--- a/scripts/generate_psa_constants.py
+++ b/scripts/generate_psa_constants.py
@@ -27,9 +27,10 @@
# limitations under the License.
import os
-import re
import sys
+from mbedtls_dev import macro_collector
+
OUTPUT_TEMPLATE = '''\
/* Automatically generated by generate_psa_constant.py. DO NOT EDIT. */
@@ -205,102 +206,7 @@
}\
'''
-class PSAMacroCollector:
- """Collect PSA crypto macro definitions from C header files.
- """
-
- def __init__(self):
- self.statuses = set()
- self.key_types = set()
- self.key_types_from_curve = {}
- self.key_types_from_group = {}
- self.ecc_curves = set()
- self.dh_groups = set()
- self.algorithms = set()
- self.hash_algorithms = set()
- self.ka_algorithms = set()
- self.algorithms_from_hash = {}
- self.key_usages = set()
-
- # "#define" followed by a macro name with either no parameters
- # or a single parameter and a non-empty expansion.
- # Grab the macro name in group 1, the parameter name if any in group 2
- # and the expansion in group 3.
- _define_directive_re = re.compile(r'\s*#\s*define\s+(\w+)' +
- r'(?:\s+|\((\w+)\)\s*)' +
- r'(.+)')
- _deprecated_definition_re = re.compile(r'\s*MBEDTLS_DEPRECATED')
-
- def read_line(self, line):
- """Parse a C header line and record the PSA identifier it defines if any.
- This function analyzes lines that start with "#define PSA_"
- (up to non-significant whitespace) and skips all non-matching lines.
- """
- # pylint: disable=too-many-branches
- m = re.match(self._define_directive_re, line)
- if not m:
- return
- name, parameter, expansion = m.groups()
- expansion = re.sub(r'/\*.*?\*/|//.*', r' ', expansion)
- if re.match(self._deprecated_definition_re, expansion):
- # Skip deprecated values, which are assumed to be
- # backward compatibility aliases that share
- # numerical values with non-deprecated values.
- return
- if name.endswith('_FLAG') or name.endswith('MASK'):
- # Macro only to build actual values
- return
- elif (name.startswith('PSA_ERROR_') or name == 'PSA_SUCCESS') \
- and not parameter:
- self.statuses.add(name)
- elif name.startswith('PSA_KEY_TYPE_') and not parameter:
- self.key_types.add(name)
- elif name.startswith('PSA_KEY_TYPE_') and parameter == 'curve':
- self.key_types_from_curve[name] = name[:13] + 'IS_' + name[13:]
- elif name.startswith('PSA_KEY_TYPE_') and parameter == 'group':
- self.key_types_from_group[name] = name[:13] + 'IS_' + name[13:]
- elif name.startswith('PSA_ECC_FAMILY_') and not parameter:
- self.ecc_curves.add(name)
- elif name.startswith('PSA_DH_FAMILY_') and not parameter:
- self.dh_groups.add(name)
- elif name.startswith('PSA_ALG_') and not parameter:
- if name in ['PSA_ALG_ECDSA_BASE',
- 'PSA_ALG_RSA_PKCS1V15_SIGN_BASE']:
- # Ad hoc skipping of duplicate names for some numerical values
- return
- self.algorithms.add(name)
- # Ad hoc detection of hash algorithms
- if re.search(r'0x020000[0-9A-Fa-f]{2}', expansion):
- self.hash_algorithms.add(name)
- # Ad hoc detection of key agreement algorithms
- if re.search(r'0x09[0-9A-Fa-f]{2}0000', expansion):
- self.ka_algorithms.add(name)
- elif name.startswith('PSA_ALG_') and parameter == 'hash_alg':
- if name in ['PSA_ALG_DSA', 'PSA_ALG_ECDSA']:
- # A naming irregularity
- tester = name[:8] + 'IS_RANDOMIZED_' + name[8:]
- else:
- tester = name[:8] + 'IS_' + name[8:]
- self.algorithms_from_hash[name] = tester
- elif name.startswith('PSA_KEY_USAGE_') and not parameter:
- self.key_usages.add(name)
- else:
- # Other macro without parameter
- return
-
- _nonascii_re = re.compile(rb'[^\x00-\x7f]+')
- _continued_line_re = re.compile(rb'\\\r?\n\Z')
- def read_file(self, header_file):
- for line in header_file:
- m = re.search(self._continued_line_re, line)
- while m:
- cont = next(header_file)
- line = line[:m.start(0)] + cont
- m = re.search(self._continued_line_re, line)
- line = re.sub(self._nonascii_re, rb'', line).decode('ascii')
- self.read_line(line)
-
-class CaseBuilder(PSAMacroCollector):
+class CaseBuilder(macro_collector.PSAMacroCollector):
"""Collect PSA crypto macro definitions and write value recognition functions.
1. Call `read_file` on the input header file(s).
