nrf_security: drivers: cracen: Remove sicrypto for ed25519

Add support for Ed25519 and Ed25519ph in cracenpsa
directly using silexpk/sxsymcrypt.
This bypasses sicrypto, which saves on flash usage
Remove sicrypto implementation of Ed25519 from
cracenpsa.

Signed-off-by: Dag Erik Gjørvad <dag.erik.gjorvad@nordicsemi.no>

Author: degjorva

subsys/nrf_security/src/drivers/cracen/cracenpsa/cracenpsa.cmake

@@ -44,6 +44,7 @@ endif()
 if(CONFIG_PSA_NEED_CRACEN_ASYMMETRIC_SIGNATURE_DRIVER)
   list(APPEND cracen_driver_sources
     ${CMAKE_CURRENT_LIST_DIR}/src/sign.c
+    ${CMAKE_CURRENT_LIST_DIR}/src/ed25519.c
   )
 endif()
 
@@ -61,6 +62,7 @@ endif()
 
 if(CONFIG_PSA_NEED_CRACEN_KEY_MANAGEMENT_DRIVER OR CONFIG_PSA_NEED_CRACEN_KMU_DRIVER OR CONFIG_MBEDTLS_PSA_CRYPTO_BUILTIN_KEYS)
   list(APPEND cracen_driver_sources
+    ${CMAKE_CURRENT_LIST_DIR}/src/ed25519.c
     ${CMAKE_CURRENT_LIST_DIR}/src/key_management.c
   )
 endif()

subsys/nrf_security/src/drivers/cracen/cracenpsa/include/cracen_psa.h

@@ -361,4 +361,20 @@ psa_status_t cracen_spake2p_get_shared_key(cracen_spake2p_operation_t *operation
 
 psa_status_t cracen_spake2p_abort(cracen_spake2p_operation_t *operation);
 
+int ed25519_sign(const uint8_t *privkey, char *signature,
+					const uint8_t *message, size_t message_length);
+
+int ed25519_verify(const uint8_t *pubkey, const char *message,
+			size_t message_length, const char *signature);
+
+
+int ed25519ph_sign(const uint8_t *privkey, char *signature,
+			const uint8_t *message, size_t message_length, int ismessage);
+
+int ed25519ph_verify(const uint8_t *pubkey, const char *message,
+			size_t message_length, const char *signature, int ismessage);
+
+int ed25519_create_pubkey(const uint8_t *privkey,
+				uint8_t *pubkey);
+
 #endif /* CRACEN_PSA_H */