Add Darwin framework API for creating operational certificates.

[bzbarsky-apple]

Will be useful for writing tests, if nothing else.

Problem

No way to get an operational certificate as an NSData * in ObjC code.

Change overview

Add an API for it.

Testing

Some unit tests included in the PR. More tests will be written that use this API in various contexts as part of other PRs.

[github-actions]

PR #18510: Size comparison from 05a20b1 to 65cfdb4

Full report (37 builds for cc13x2_26x2, cyw30739, efr32, esp32, k32w, linux, mbed, nrfconnect, p6, telink)

platform	target	config	section	05a20b1	65cfdb4	change	% change
cc13x2_26x2	all-clusters-app	LP_CC2652R7	(read only)	692151	692151	0	0.0
			(read/write)	159384	159384	0	0.0
			.bss	74516	74516	0	0.0
			.data	3412	3412	0	0.0
			.rodata	103823	103823	0	0.0
			.text	587848	587848	0	0.0
	lock-ftd	LP_CC2652R7	(read only)	676863	676863	0	0.0
			(read/write)	165776	165776	0	0.0
			.bss	72676	72676	0	0.0
			.data	3236	3236	0	0.0
			.rodata	94967	94967	0	0.0
			.text	581412	581412	0	0.0
	lock-mtd	LP_CC2652R7	(read only)	625695	625695	0	0.0
			(read/write)	145508	145508	0	0.0
			.bss	68412	68412	0	0.0
			.data	3236	3236	0	0.0
			.rodata	94855	94855	0	0.0
			.text	530348	530348	0	0.0
	pump-app	LP_CC2652R7	(read only)	660387	660387	0	0.0
			(read/write)	183532	183532	0	0.0
			.bss	72932	72932	0	0.0
			.data	3268	3268	0	0.0
			.rodata	80467	80467	0	0.0
			.text	579440	579440	0	0.0
	pump-controller-app	LP_CC2652R7	(read only)	653555	653555	0	0.0
			(read/write)	190172	190172	0	0.0
			.bss	72996	72996	0	0.0
			.data	3232	3232	0	0.0
			.rodata	83571	83571	0	0.0
			.text	569504	569504	0	0.0
	shell	LP_CC2652R7	(read only)	686538	686538	0	0.0
			(read/write)	160820	160820	0	0.0
			.bss	77140	77140	0	0.0
			.data	3416	3416	0	0.0
			.rodata	101370	101370	0	0.0
			.text	584684	584684	0	0.0
cyw30739	light	cyw930739m2evb_01	(read/write)	624766	624766	0	0.0
			.app_xip_area	528396	528396	0	0.0
			.bss	79012	79012	0	0.0
			.data	708	708	0	0.0
			.rodata	0	0	0	0.0
			.text	0	0	0	0.0
	lock	cyw930739m2evb_01	(read/write)	627826	627826	0	0.0
			.app_xip_area	532912	532912	0	0.0
			.bss	77588	77588	0	0.0
			.data	672	672	0	0.0
			.rodata	0	0	0	0.0
			.text	0	0	0	0.0
	ota-requestor-no-progress-logging	cyw930739m2evb_01	(read/write)	572266	572266	0	0.0
			.app_xip_area	467636	467636	0	0.0
			.bss	87008	87008	0	0.0
			.data	584	584	0	0.0
			.rodata	0	0	0	0.0
			.text	112	112	0	0.0
efr32	lighting-app	BRD4161A	(read only)	915068	915068	0	0.0
			(read/write)	133220	133220	0	0.0
			.bss	131160	131160	0	0.0
			.data	2060	2060	0	0.0
			.text	915060	915060	0	0.0
		BRD4161A+rpc	(read only)	949304	949304	0	0.0
			(read/write)	149904	149904	0	0.0
			.bss	147640	147640	0	0.0
			.data	2264	2264	0	0.0
			.text	949296	949296	0	0.0
		BRD4161A+rs911x	(read only)	784416	784416	0	0.0
			(read/write)	128444	128444	0	0.0
			.bss	126372	126372	0	0.0
			.data	2068	2068	0	0.0
			.text	784408	784408	0	0.0
	lock-app	BRD4161A+wf200	(read only)	945156	945156	0	0.0
			(read/write)	122924	122924	0	0.0
			.bss	120900	120900	0	0.0
			.data	2024	2024	0	0.0
			.text	945148	945148	0	0.0
	window-app	BRD4161A	(read only)	895188	895188	0	0.0
			(read/write)	133280	133280	0	0.0
			.bss	131232	131232	0	0.0
			.data	2048	2048	0	0.0
			.text	895180	895180	0	0.0
esp32	all-clusters-app	c3devkit	(read only)	998376	998376	0	0.0
			(read/write)	1477026	1477026	0	0.0
			.dram0.bss	67128	67128	0	0.0
			.dram0.data	14576	14576	0	0.0
			.flash.rodata	209888	209888	0	0.0
			.flash.text	998376	998376	0	0.0
			.iram0.text	62954	62954	0	0.0
		m5stack	(read only)	1053635	1053635	0	0.0
			(read/write)	479024	479024	0	0.0
			.dram0.bss	72656	72656	0	0.0
			.dram0.data	34184	34184	0	0.0
			.flash.rodata	240188	240188	0	0.0
			.flash.text	1048251	1048251	0	0.0
			.iram0.text	123267	123267	0	0.0
k32w	light	k32w061+release	(read/write)	682516	682516	0	0.0
			.bss	80200	80200	0	0.0
			.data	2016	2016	0	0.0
			.text	598596	598596	0	0.0
	lock	k32w061+release	(read/write)	729012	729012	0	0.0
			.bss	80632	80632	0	0.0
			.data	1976	1976	0	0.0
			.text	644700	644700	0	0.0
linux	all-clusters-app	debug	(read only)	2738905	2738905	0	0.0
			(read/write)	174624	174624	0	0.0
			.bss	83904	83904	0	0.0
			.data	2064	2064	0	0.0
			.data.rel.ro	82488	82488	0	0.0
			.dynamic	608	608	0	0.0
			.got	4496	4496	0	0.0
			.init	27	27	0	0.0
			.init_array	1016	1016	0	0.0
			.rodata	238877	238877	0	0.0
			.text	2323938	2323938	0	0.0
	bridge-app	debug+rpc	(read only)	2021385	2021385	0	0.0
			(read/write)	146552	146552	0	0.0
			.bss	71744	71744	0	0.0
			.data	3936	3936	0	0.0
			.data.rel.ro	65288	65288	0	0.0
			.dynamic	592	592	0	0.0
			.got	4272	4272	0	0.0
			.init	27	27	0	0.0
			.init_array	688	688	0	0.0
			.rodata	167401	167401	0	0.0
			.text	1696002	1696002	0	0.0
	chip-tool	debug	(read only)	9282453	9282453	0	0.0
			(read/write)	578864	578864	0	0.0
			.bss	22816	22816	0	0.0
			.data	1136	1136	0	0.0
			.data.rel.ro	548608	548608	0	0.0
			.dynamic	624	624	0	0.0
			.got	5000	5000	0	0.0
			.init	27	27	0	0.0
			.init_array	648	648	0	0.0
			.rodata	479061	479061	0	0.0
			.text	7474613	7474613	0	0.0
	chip-tool-no-interactive-ipv6only	arm64	(read only)	9058756	9058756	0	0.0
			(read/write)	644993	644993	0	0.0
			.bss	41105	41105	0	0.0
			.data	1192	1192	0	0.0
			.data.rel.ro	583864	583864	0	0.0
			.dynamic	560	560	0	0.0
			.got	14992	14992	0	0.0
			.init	24	24	0	0.0
			.init_array	184	184	0	0.0
			.rodata	445124	445124	0	0.0
			.text	7149732	7149732	0	0.0
	lighting-app	debug+rpc	(read only)	2315209	2315209	0	0.0
			(read/write)	152000	152000	0	0.0
			.bss	73536	73536	0	0.0
			.data	2048	2048	0	0.0
			.data.rel.ro	70664	70664	0	0.0
			.dynamic	608	608	0	0.0
			.got	4344	4344	0	0.0
			.init	27	27	0	0.0
			.init_array	792	792	0	0.0
			.rodata	186473	186473	0	0.0
			.text	1961522	1961522	0	0.0
	lock-app	debug	(read only)	2228937	2228937	0	0.0
			(read/write)	146680	146680	0	0.0
			.bss	72224	72224	0	0.0
			.data	1568	1568	0	0.0
			.data.rel.ro	67192	67192	0	0.0
			.dynamic	592	592	0	0.0
			.got	4336	4336	0	0.0
			.init	27	27	0	0.0
			.init_array	752	752	0	0.0
			.rodata	197049	197049	0	0.0
			.text	1870994	1870994	0	0.0
	ota-provider-app	debug	(read only)	2049873	2049873	0	0.0
			(read/write)	139728	139728	0	0.0
			.bss	71680	71680	0	0.0
			.data	1768	1768	0	0.0
			.data.rel.ro	60488	60488	0	0.0
			.dynamic	608	608	0	0.0
			.got	4504	4504	0	0.0
			.init	27	27	0	0.0
			.init_array	648	648	0	0.0
			.rodata	177267	177267	0	0.0
			.text	1714210	1714210	0	0.0
	ota-requestor-app	debug	(read only)	2079201	2079201	0	0.0
			(read/write)	142568	142568	0	0.0
			.bss	72352	72352	0	0.0
			.data	1992	1992	0	0.0
			.data.rel.ro	62584	62584	0	0.0
			.dynamic	592	592	0	0.0
			.got	4344	4344	0	0.0
			.init	27	27	0	0.0
			.init_array	672	672	0	0.0
			.rodata	173468	173468	0	0.0
			.text	1745874	1745874	0	0.0
	shell	debug	(read only)	2555289	2555289	0	0.0
			(read/write)	198552	198552	0	0.0
			.bss	114632	114632	0	0.0
			.data	1376	1376	0	0.0
			.data.rel.ro	76776	76776	0	0.0
			.dynamic	608	608	0	0.0
			.got	4192	4192	0	0.0
			.init	27	27	0	0.0
			.init_array	936	936	0	0.0
			.rodata	220050	220050	0	0.0
			.text	2172530	2172530	0	0.0
	thermostat-no-ble	arm64	(read only)	2343780	2343780	0	0.0
			(read/write)	175121	175121	0	0.0
			.bss	86465	86465	0	0.0
			.data	1520	1520	0	0.0
			.data.rel.ro	79336	79336	0	0.0
			.dynamic	560	560	0	0.0
			.got	4768	4768	0	0.0
			.init	24	24	0	0.0
			.init_array	376	376	0	0.0
			.rodata	147108	147108	0	0.0
			.text	1966848	1966848	0	0.0
	tv-app	debug	(read only)	2841185	2841185	0	0.0
			(read/write)	277472	277472	0	0.0
			.bss	189592	189592	0	0.0
			.data	4672	4672	0	0.0
			.data.rel.ro	76960	76960	0	0.0
			.dynamic	592	592	0	0.0
			.got	4720	4720	0	0.0
			.init	27	27	0	0.0
			.init_array	928	928	0	0.0
			.rodata	219345	219345	0	0.0
			.text	2438562	2438562	0	0.0
	tv-casting-app	debug	(read only)	5403545	5403545	0	0.0
			(read/write)	223776	223776	0	0.0
			.bss	77240	77240	0	0.0
			.data	2368	2368	0	0.0
			.data.rel.ro	137952	137952	0	0.0
			.dynamic	608	608	0	0.0
			.got	4728	4728	0	0.0
			.init	27	27	0	0.0
			.init_array	864	864	0	0.0
			.rodata	337921	337921	0	0.0
			.text	4705314	4705314	0	0.0
mbed	lock-app	CY8CPROTO_062_4343W+release	(read only)	6224	6224	0	0.0
			(read/write)	2418784	2418784	0	0.0
			.bss	201588	201588	0	0.0
			.data	5872	5872	0	0.0
			.text	1381428	1381428	0	0.0
nrfconnect	all-clusters-app	nrf52840dk_nrf52840	(read/write)	1180243	1180243	0	0.0
			bss	138356	138356	0	0.0
			rodata	152956	152956	0	0.0
			text	810160	810160	0	0.0
p6	all-clusters-app	default	(read/write)	2532168	2532168	0	0.0
			.bss	135096	135096	0	0.0
			.data	2808	2808	0	0.0
			.text	1490432	1490432	0	0.0
	light-app	default	(read/write)	2418776	2418776	0	0.0
			.bss	128416	128416	0	0.0
			.data	2608	2608	0	0.0
			.text	1377040	1377040	0	0.0
	lock-app	default	(read/write)	2429424	2429424	0	0.0
			.bss	128232	128232	0	0.0
			.data	2568	2568	0	0.0
			.text	1387688	1387688	0	0.0
telink	light-switch-app	tlsr9518adk80d	(read/write)	782116	782116	0	0.0
			bss	70592	70592	0	0.0
			noinit	40416	40416	0	0.0
			text	553028	553028	0	0.0
	lighting-app	tlsr9518adk80d	(read/write)	802208	802208	0	0.0
			bss	70848	70848	0	0.0
			noinit	40416	40416	0	0.0
			text	569794	569794	0	0.0