libckteec: serialize_ck.c: serialize AES-GCM mechanism parameters

This commits adds serialize_mecha_aes_gcm() function to serialize_ck.c to support AES-GCM mechanism (CKM_AES_GCM) in libckteec. Co-developed-by: Etienne Carriere <[email protected]> Signed-off-by: Etienne Carriere <[email protected]> Signed-off-by: Marouene Boubakri <[email protected]> Reviewed-by: Etienne Carriere <[email protected]>
OP-TEE · Dec 7, 2023 · 98dc4f4 · 98dc4f4
1 parent a8381cf
commit 98dc4f4
Showing 1 changed file with 45 additions and 0 deletions.
diff --git a/libckteec/src/serialize_ck.c b/libckteec/src/serialize_ck.c
@@ -411,6 +411,48 @@ static CK_RV serialize_mecha_aes_ctr(struct serializer *obj,
 	return rv;
 }
 
+static CK_RV serialize_mecha_aes_gcm(struct serializer *obj,
+				     CK_MECHANISM_PTR mecha)
+{
+	CK_GCM_PARAMS_PTR param = mecha->pParameter;
+	CK_RV rv = CKR_GENERAL_ERROR;
+	CK_ULONG aad_len = 0;
+
+	/* AAD is not manadatory */
+	if (param->pAAD)
+		aad_len = param->ulAADLen;
+
+	if (!param->pIv)
+		return CKR_MECHANISM_PARAM_INVALID;
+
+	rv = serialize_32b(obj, obj->type);
+	if (rv)
+		return rv;
+
+	rv = serialize_32b(obj, 3 * sizeof(uint32_t) +
+				param->ulIvLen + aad_len);
+	if (rv)
+		return rv;
+
+	rv = serialize_ck_ulong(obj, param->ulIvLen);
+	if (rv)
+		return rv;
+
+	rv = serialize_buffer(obj, param->pIv, param->ulIvLen);
+	if (rv)
+		return rv;
+
+	rv = serialize_ck_ulong(obj, aad_len);
+	if (rv)
+		return rv;
+
+	rv = serialize_buffer(obj, param->pAAD, aad_len);
+	if (rv)
+		return rv;
+
+	return serialize_ck_ulong(obj, param->ulTagBits);
+}
+
 static CK_RV serialize_mecha_aes_iv(struct serializer *obj,
 				    CK_MECHANISM_PTR mecha)
 {
@@ -753,6 +795,9 @@ CK_RV serialize_ck_mecha_params(struct serializer *obj,
 	case CKM_AES_CTR:
 		return serialize_mecha_aes_ctr(obj, &mecha);
 
+	case CKM_AES_GCM:
+		return serialize_mecha_aes_gcm(obj, &mecha);
+
 	case CKM_AES_ECB_ENCRYPT_DATA:
 		return serialize_mecha_key_deriv_str(obj, &mecha);