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Break out algorithm_tester() as a separate method

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No intended behavior change.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2021-10-04 18:10:16 +02:00
parent 460d779773
commit 3545103fd4
1 changed files with 20 additions and 6 deletions
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26
scripts/mbedtls_dev/macro_collector.py
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@ -232,6 +232,25 @@ class PSAMacroCollector(PSAMacroEnumerator):
self.key_types_from_group = {} #type: Dict[str, str]
self.algorithms_from_hash = {} #type: Dict[str, str]
@staticmethod
def algorithm_tester(name: str) -> str:
"""The predicate for whether an algorithm is built from the given constructor.
The given name must be the name of an algorithm constructor of the
form ``PSA_ALG_xxx`` which is used as ``PSA_ALG_xxx(yyy)`` to build
an algorithm value. Return the corresponding predicate macro which
is used as ``predicate(alg)`` to test whether ``alg`` can be built
as ``PSA_ALG_xxx(yyy)``. The predicate is usually called
``PSA_ALG_IS_xxx``.
"""
prefix = 'PSA_ALG_'
assert name.startswith(prefix)
midfix = 'IS_'
suffix = name[len(prefix):]
if suffix in ['DSA', 'ECDSA']:
midfix += 'RANDOMIZED_'
return prefix + midfix + suffix
def record_algorithm_subtype(self, name: str, expansion: str) -> None:
"""Record the subtype of an algorithm constructor.
@ -307,12 +326,7 @@ class PSAMacroCollector(PSAMacroEnumerator):
self.algorithms.add(name)
self.record_algorithm_subtype(name, expansion)
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
self.algorithms_from_hash[name] = self.algorithm_tester(name)
elif name.startswith('PSA_KEY_USAGE_') and not parameter:
self.key_usage_flags.add(name)
else: