p_CSwift_AttachKeyParam actually returns more than one kind of error. Detect the input size error, treat any that are not specially checked as 'request failed', not as 'provide parameters', and for those, add the actual status code to the error message

crypto/engine/engine_err.c

@@ -146,6 +146,7 @@ static ERR_STRING_DATA ENGINE_str_reasons[]=
 {ENGINE_R_PROVIDE_PARAMETERS             ,"provide parameters"},
 {ENGINE_R_REQUEST_FAILED                 ,"request failed"},
 {ENGINE_R_REQUEST_FALLBACK               ,"request fallback"},
+{ENGINE_R_SIZE_TOO_LARGE_OR_TOO_SMALL    ,"size too large or too small"},
 {ENGINE_R_UNIT_FAILURE                   ,"unit failure"},
 {0,NULL}
 	};