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Check truncation length explicitly

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Comparing algorithm with its FULL_LENGTH_MAC version doesn't work in
cases where algorithm is a wildcard. Wildcard input is not specified in
the documentation of the function, but in order to test the function
using the same test as PSA_MAC_LENGTH we're mimicking that behaviour here.

Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
This commit is contained in:
Steven Cooreman 2021-03-03 12:07:20 +01:00
parent 58c94d39ae
commit 4ff9a29686
1 changed files with 3 additions and 2 deletions
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5
library/psa_crypto.c
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@ -583,8 +583,9 @@ MBEDTLS_STATIC_TESTABLE psa_status_t psa_get_mac_output_length(
return( PSA_ERROR_INVALID_ARGUMENT ); return( PSA_ERROR_INVALID_ARGUMENT );
/* Output the expected (potentially truncated) length as long as it can /* Output the expected (potentially truncated) length as long as it can
* actually be output by the algorithm */ * actually be output by the algorithm. Truncation length of '0' means
if( PSA_ALG_FULL_LENGTH_MAC( algorithm ) == algorithm ) * default output length of the keytype-algorithm combination. */
if( PSA_MAC_TRUNCATED_LENGTH( algorithm ) == 0 )
{ {
*length = default_length; *length = default_length;
return( PSA_SUCCESS ); return( PSA_SUCCESS );