Add utility function ossl_param_is_empty()

Changed all provider implementations that have a set_ctx_params()
to call this function instead of just testing (params == NULL).This
detects the case wherean OSSL_PARAM array contains just a terminator
entry.

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Tom Cosgrove <tom.cosgrove@arm.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/25499)

1 files changed, 5 insertions, 0 deletions

diff --git a/providers/common/include/prov/providercommon.h b/providers/common/include/prov/providercommon.h
index 6366547e7c..4a1a043a84 100644
--- a/providers/common/include/prov/providercommon.h
+++ b/providers/common/include/prov/providercommon.h
@@ -22,3 +22,8 @@ void ossl_set_error_state(const char *type);
 
 /* Return true if the module is in a usable condition */
 int ossl_prov_is_running(void);
+
+static ossl_inline int ossl_param_is_empty(const OSSL_PARAM params[])
+{
+    return params == NULL || params->key == NULL;
+}