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Explain the purpose of check_parity

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Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2020-08-26 10:24:26 +02:00
parent 34f063ca47
commit 6c75152b9f
1 changed files with 10 additions and 0 deletions
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10
tests/suites/test_suite_psa_crypto_metadata.function
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@ -57,6 +57,16 @@
TEST_ASSERT( PSA_##flag( alg ) == !! ( ( flags ) & flag ) ) TEST_ASSERT( PSA_##flag( alg ) == !! ( ( flags ) & flag ) )
/* Check the parity of value. /* Check the parity of value.
*
* There are several numerical encodings for which the PSA Cryptography API
* specification deliberately defines encodings that all have the same
* parity. This way, a data glitch that flips one bit in the data cannot
* possibly turn a valid encoding into another valid encoding. Here in
* the tests, we check that the values (including Mbed TLS vendor-specific
* values) have the expected parity.
*
* The expected parity is even so that 0 is considered a valid encoding.
*
* Return 0 if value has even parity and a nonzero value otherwise. */ * Return 0 if value has even parity and a nonzero value otherwise. */
int check_parity( uint32_t value ) int check_parity( uint32_t value )
{ {