+/**\r
+ Allocates and initializes one HMAC_CTX context for subsequent HMAC-SHA256 use.\r
+\r
+ Return NULL to indicate this interface is not supported.\r
+\r
+ @return NULL This interface is not supported..\r
+\r
+**/\r
+VOID *\r
+EFIAPI\r
+HmacSha256New (\r
+ VOID\r
+ )\r
+{\r
+ ASSERT (FALSE);\r
+ return NULL;\r
+}\r
+\r
+/**\r
+ Release the specified HMAC_CTX context.\r
+\r
+ This function will do nothing.\r
+\r
+ @param[in] HmacSha256Ctx Pointer to the HMAC_CTX context to be released.\r
+\r
+**/\r
+VOID\r
+EFIAPI\r
+HmacSha256Free (\r
+ IN VOID *HmacSha256Ctx\r
+ )\r
+{\r
+ ASSERT (FALSE);\r
+ return;\r
+}\r
+\r