psa: Expect zero-length exported-public symmetric keys
Because exporting-public a symmetric key fails, we have no reasonable
expectation that the exported key length has any value at all other than
something obviously incorrect or "empty", like a key with a length of 0.
Our current implementation explicitly sets the exported key length to 0
on errors, so test for this. Fix the "PSA import/export-public: cannot
export-public a symmetric key" test to expect a key length of 0 instead
of 162.
diff --git a/tests/suites/test_suite_psa_crypto.data b/tests/suites/test_suite_psa_crypto.data
index 265a6d5..612a152 100644
--- a/tests/suites/test_suite_psa_crypto.data
+++ b/tests/suites/test_suite_psa_crypto.data
@@ -103,7 +103,7 @@
PSA import/export-public: cannot export-public a symmetric key
depends_on:MBEDTLS_PK_C:MBEDTLS_PK_PARSE_C:MBEDTLS_RSA_C
-import_export_public_key:"2b7e151628aed2a6abf7158809cf4f3c":PSA_KEY_TYPE_AES:PSA_ALG_CBC_BASE | PSA_ALG_BLOCK_CIPHER_PAD_NONE:128:162:PSA_ERROR_INVALID_ARGUMENT
+import_export_public_key:"2b7e151628aed2a6abf7158809cf4f3c":PSA_KEY_TYPE_AES:PSA_ALG_CBC_BASE | PSA_ALG_BLOCK_CIPHER_PAD_NONE:128:0:PSA_ERROR_INVALID_ARGUMENT
PSA import/export EC secp256r1: good
depends_on:MBEDTLS_PK_C:MBEDTLS_PK_PARSE_C:MBEDTLS_ECP_C:MBEDTLS_ECP_DP_SECP256R1_ENABLED