drivers: pk: add new error code for signature failure

Now that "pk_[sign|verify]_ext()" work the same for all PK context types
it doesn't make sense to translate "PSA_ERROR_INVALID_SIGNATURE" to
"MBEDTLS_ERR_RSA_VERIFY_FAILED". Besides this translation is only available
when RSA key types are defined, which is not always true.

For this reason this commit introduces a more generic
"MBEDTLS_ERR_PK_INVALID_SIGNATURE" which is valid for any PK context handled
by PK module. The translation is trivially to "PSA_ERROR_INVALID_SIGNATURE"
of course.

Signed-off-by: Valerio Setti <vsetti@baylibre.com>

Author: valeriosetti

drivers/builtin/src/psa_util_internal.c

@@ -145,6 +145,8 @@ int psa_pk_status_to_mbedtls(psa_status_t status)
             return MBEDTLS_ERR_PK_ALLOC_FAILED;
         case PSA_ERROR_BAD_STATE:
             return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
+        case PSA_ERROR_INVALID_SIGNATURE:
+            return MBEDTLS_ERR_PK_INVALID_SIGNATURE;
         case PSA_ERROR_DATA_CORRUPT:
         case PSA_ERROR_DATA_INVALID:
         case PSA_ERROR_STORAGE_FAILURE:

include/mbedtls/pk.h

@@ -41,6 +41,8 @@
 #define MBEDTLS_ERR_PK_UNKNOWN_NAMED_CURVE -0x3A00
 /** Unavailable feature, e.g. RSA disabled for RSA key. */
 #define MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE -0x3980
+/** Invalid signature */
+#define MBEDTLS_ERR_PK_INVALID_SIGNATURE   PSA_ERROR_INVALID_SIGNATURE
 
 #ifdef __cplusplus
 extern "C" {