asn1-ut-integer.cpp@ 72426

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1	/* $Id: asn1-ut-integer.cpp 72371 2018-05-28 20:26:49Z vboxsync $ */
2	/** @file
3	* IPRT - ASN.1, INTEGER Type.
4	*/
5
6	/*
7	* Copyright (C) 2006-2017 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* The contents of this file may alternatively be used under the terms
18	* of the Common Development and Distribution License Version 1.0
19	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20	* VirtualBox OSE distribution, in which case the provisions of the
21	* CDDL are applicable instead of those of the GPL.
22	*
23	* You may elect to license modified versions of this file under the
24	* terms and conditions of either the GPL or the CDDL or both.
25	*/
26
27
28	/*********************************************************************************************************************************
29	* Header Files *
30	*********************************************************************************************************************************/
31	#include "internal/iprt.h"
32	#include <iprt/asn1.h>
33
34	#include <iprt/bignum.h>
35	#include <iprt/err.h>
36	#include <iprt/string.h>
37
38	#include <iprt/formats/asn1.h>
39
40
41	/*********************************************************************************************************************************
42	* Global Variables *
43	*********************************************************************************************************************************/
44	/** Fixed on-byte constants for small numbers.
45	* Good for structure version values and such. */
46	static const uint8_t g_abSmall[] =
47	{
48	0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
49	16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
50	};
51
52
53
54	/*
55	* ASN.1 INTEGER - Special Methods.
56	*/
57
58
59	/**
60	* Updates the native value we keep in RTASN1INTEGER::uValue.
61	*
62	* @param pThis The integer.
63	*/
64	static void rtAsn1Integer_UpdateNativeValue(PRTASN1INTEGER pThis)
65	{
66	uint32_t offLast = pThis->Asn1Core.cb - 1;
67	switch (pThis->Asn1Core.cb)
68	{
69	default: AssertBreak(pThis->Asn1Core.cb > 8); /* paranoia */ RT_FALL_THRU();
70	case 8: pThis->uValue.u \|= (uint64_t)pThis->Asn1Core.uData.pu8[offLast - 7] << 56; RT_FALL_THRU();
71	case 7: pThis->uValue.u \|= (uint64_t)pThis->Asn1Core.uData.pu8[offLast - 6] << 48; RT_FALL_THRU();
72	case 6: pThis->uValue.u \|= (uint64_t)pThis->Asn1Core.uData.pu8[offLast - 5] << 40; RT_FALL_THRU();
73	case 5: pThis->uValue.u \|= (uint64_t)pThis->Asn1Core.uData.pu8[offLast - 4] << 32; RT_FALL_THRU();
74	case 4: pThis->uValue.u \|= (uint32_t)pThis->Asn1Core.uData.pu8[offLast - 3] << 24; RT_FALL_THRU();
75	case 3: pThis->uValue.u \|= (uint32_t)pThis->Asn1Core.uData.pu8[offLast - 2] << 16; RT_FALL_THRU();
76	case 2: pThis->uValue.u \|= (uint16_t)pThis->Asn1Core.uData.pu8[offLast - 1] << 8; RT_FALL_THRU();
77	case 1: pThis->uValue.u \|= pThis->Asn1Core.uData.pu8[offLast];
78	}
79	}
80
81
82	RTDECL(int) RTAsn1Integer_InitU64(PRTASN1INTEGER pThis, uint64_t uValue, PCRTASN1ALLOCATORVTABLE pAllocator)
83	{
84	/*
85	* Initialize the core and the native value.
86	*/
87	RTAsn1Core_InitEx(&pThis->Asn1Core,
88	ASN1_TAG_INTEGER,
89	ASN1_TAGCLASS_UNIVERSAL \| ASN1_TAGFLAG_PRIMITIVE,
90	&g_RTAsn1Integer_Vtable,
91	RTASN1CORE_F_PRESENT \| RTASN1CORE_F_PRIMITE_TAG_STRUCT);
92	pThis->uValue.u = uValue;
93
94	/*
95	* Use one of the constants if possible.
96	*/
97	if (uValue < RT_ELEMENTS(g_abSmall))
98	{
99	pThis->Asn1Core.cb = 1;
100	pThis->Asn1Core.uData.pv = (void *)&g_abSmall[0];
101	}
102	else
103	{
104	/*
105	* Need to turn uValue into a big endian number without any
106	* unnecessary leading zero bytes.
107	*/
108	/* Figure the size. */
109	uint32_t cb = 0;
110	if (uValue <= UINT32_MAX)
111	{
112	if (uValue <= UINT16_MAX)
113	{
114	if (uValue <= UINT8_MAX)
115	cb = 1;
116	else
117	cb = 2;
118	}
119	else
120	{
121	if (uValue <= UINT32_C(0xffffff))
122	cb = 3;
123	else
124	cb = 4;
125	}
126	}
127	else
128	{
129	if (uValue <= UINT64_C(0x0000FfffFfffFfff))
130	{
131	if (uValue <= UINT64_C(0x000000ffFfffFfff))
132	cb = 5;
133	else
134	cb = 6;
135	}
136	else
137	{
138	if (uValue <= UINT64_C(0x00ffFfffFfffFfff))
139	cb = 7;
140	else
141	cb = 8;
142	}
143	}
144
145	/* Allocate space. */
146	int rc = RTAsn1ContentAllocZ(&pThis->Asn1Core, cb, pAllocator);
147	if (RT_FAILURE(rc))
148	{
149	RT_ZERO(*pThis);
150	return rc;
151	}
152
153	/* Serialize the number in MSB order. */
154	uint8_t pb = (uint8_t )pThis->Asn1Core.uData.pu8;
155	while (cb-- > 0)
156	{
157	pb[cb] = (uint8_t)uValue;
158	uValue >>= 8;
159	}
160	Assert(uValue == 0);
161	}
162	return VINF_SUCCESS;
163	}
164
165
166	RTDECL(int) RTAsn1Integer_InitDefault(PRTASN1INTEGER pThis, uint64_t uValue, PCRTASN1ALLOCATORVTABLE pAllocator)
167	{
168	int rc = RTAsn1Integer_InitU64(pThis, uValue, pAllocator);
169	if (RT_SUCCESS(rc))
170	{
171	pThis->Asn1Core.fFlags &= ~RTASN1CORE_F_PRESENT;
172	pThis->Asn1Core.fFlags \|= RTASN1CORE_F_DEFAULT;
173	}
174	return rc;
175	}
176
177
178	RTDECL(int32_t) RTAsn1Integer_UnsignedLastBit(PCRTASN1INTEGER pThis)
179	{
180	AssertReturn(pThis->Asn1Core.fFlags, -1);
181	uint8_t const *pb = pThis->Asn1Core.uData.pu8;
182	AssertReturn(pb, -1);
183	uint32_t cb = pThis->Asn1Core.cb;
184	AssertReturn(pThis->Asn1Core.cb < (uint32_t)INT32_MAX / 8, -1);
185
186	while (cb-- > 0)
187	{
188	uint8_t b = *pb++;
189	if (b)
190	{
191	int32_t iRet = cb * 8;
192	if (b & 0x80) iRet += 7;
193	else if (b & 0x40) iRet += 6;
194	else if (b & 0x20) iRet += 5;
195	else if (b & 0x10) iRet += 4;
196	else if (b & 0x08) iRet += 3;
197	else if (b & 0x04) iRet += 2;
198	else if (b & 0x02) iRet += 1;
199	else Assert(b == 0x01);
200	return iRet;
201	}
202	}
203	return -1;
204	}
205
206
207	RTDECL(int) RTAsn1Integer_UnsignedCompare(PCRTASN1INTEGER pLeft, PCRTASN1INTEGER pRight)
208	{
209	Assert(pLeft && (!RTAsn1Integer_IsPresent(pLeft) \|\| pLeft->Asn1Core.pOps == &g_RTAsn1Integer_Vtable));
210	Assert(pRight && (!RTAsn1Integer_IsPresent(pRight) \|\| pRight->Asn1Core.pOps == &g_RTAsn1Integer_Vtable));
211
212	int iDiff;
213	if (RTAsn1Integer_IsPresent(pLeft))
214	{
215	if (RTAsn1Integer_IsPresent(pRight))
216	{
217	if ( pLeft->Asn1Core.cb > 8
218	\|\| pRight->Asn1Core.cb > 8)
219	{
220	uint32_t iLeft = RTAsn1Integer_UnsignedLastBit(pLeft);
221	uint32_t iRight = RTAsn1Integer_UnsignedLastBit(pRight);
222	if (iLeft != iRight)
223	return iLeft < iRight ? -1 : 1;
224
225	uint32_t i = iLeft / 8;
226	if (i > 8)
227	{
228	uint8_t const *pbLeft = &pLeft->Asn1Core.uData.pu8[pLeft->Asn1Core.cb - i - 1];
229	uint8_t const *pbRight = &pRight->Asn1Core.uData.pu8[pRight->Asn1Core.cb - i - 1];
230	for (;;)
231	{
232	if (pbLeft != pbRight)
233	return pbLeft < pbRight ? -1 : 1;
234	if (--i <= 8)
235	break;
236	pbLeft++;
237	pbRight++;
238	}
239	}
240	}
241
242	if (pLeft->uValue.u == pRight->uValue.u)
243	iDiff = 0;
244	else
245	iDiff = pLeft->uValue.u < pRight->uValue.u ? -1 : 1;
246	}
247	else
248	iDiff = -1;
249	}
250	else
251	iDiff = 0 - (int)RTAsn1Integer_IsPresent(pRight);
252	return iDiff;
253	}
254
255
256	RTDECL(int) RTAsn1Integer_UnsignedCompareWithU64(PCRTASN1INTEGER pThis, uint64_t u64Const)
257	{
258	int iDiff;
259	if (RTAsn1Integer_IsPresent(pThis))
260	{
261	if (pThis->Asn1Core.cb > 8)
262	{
263	int32_t iLast = RTAsn1Integer_UnsignedLastBit(pThis);
264	if (iLast >= 64)
265	return 1;
266	}
267
268	if (pThis->uValue.u == u64Const)
269	iDiff = 0;
270	else
271	iDiff = pThis->uValue.u < u64Const ? -1 : 1;
272	}
273	else
274	iDiff = 1;
275	return iDiff;
276	}
277
278
279	RTDECL(int) RTAsn1Integer_UnsignedCompareWithU32(PCRTASN1INTEGER pThis, uint32_t u32Const)
280	{
281	int iDiff;
282	if (RTAsn1Integer_IsPresent(pThis))
283	{
284	if (pThis->Asn1Core.cb > 8)
285	{
286	int32_t iLast = RTAsn1Integer_UnsignedLastBit(pThis);
287	if (iLast >= 32)
288	return 1;
289	}
290
291	if (pThis->uValue.u == u32Const)
292	iDiff = 0;
293	else
294	iDiff = pThis->uValue.u < u32Const ? -1 : 1;
295	}
296	else
297	iDiff = 1;
298	return iDiff;
299	}
300
301
302	RTDECL(int) RTAsn1Integer_ToBigNum(PCRTASN1INTEGER pThis, PRTBIGNUM pBigNum, uint32_t fBigNumInit)
303	{
304	AssertReturn(!(fBigNumInit & ~( RTBIGNUMINIT_F_SENSITIVE \| RTBIGNUMINIT_F_UNSIGNED \| RTBIGNUMINIT_F_SIGNED
305	\| RTBIGNUMINIT_F_ENDIAN_LITTLE \| RTBIGNUMINIT_F_ENDIAN_BIG)),
306	VERR_INVALID_PARAMETER);
307	AssertReturn(RTAsn1Integer_IsPresent(pThis), VERR_INVALID_PARAMETER);
308
309	if (!(fBigNumInit & (RTBIGNUMINIT_F_UNSIGNED \| RTBIGNUMINIT_F_SIGNED)))
310	fBigNumInit \|= RTBIGNUMINIT_F_SIGNED;
311
312	if (!(fBigNumInit & (RTBIGNUMINIT_F_ENDIAN_BIG \| RTBIGNUMINIT_F_ENDIAN_LITTLE)))
313	fBigNumInit \|= RTBIGNUMINIT_F_ENDIAN_BIG;
314
315	return RTBigNumInit(pBigNum, fBigNumInit, pThis->Asn1Core.uData.pv, pThis->Asn1Core.cb);
316	}
317
318
319	RTDECL(int) RTAsn1Integer_FromBigNum(PRTASN1INTEGER pThis, PCRTBIGNUM pBigNum, PCRTASN1ALLOCATORVTABLE pAllocator)
320	{
321	AssertPtr(pThis); AssertPtr(pBigNum); AssertPtr(pAllocator);
322
323	/* Be nice and auto init the object. */
324	if (!RTAsn1Integer_IsPresent(pThis))
325	RTAsn1Integer_Init(pThis, NULL);
326
327	uint32_t cb = RTBigNumByteWidth(pBigNum); Assert(cb > 0);
328	int rc = RTAsn1ContentReallocZ(&pThis->Asn1Core, cb, pAllocator);
329	if (RT_SUCCESS(rc))
330	{
331	Assert(cb == pThis->Asn1Core.cb);
332	rc = RTBigNumToBytesBigEndian(pBigNum, (void *)pThis->Asn1Core.uData.pv, cb);
333	if (RT_SUCCESS(rc))
334	rtAsn1Integer_UpdateNativeValue(pThis);
335	}
336	return rc;
337	}
338
339
340	RTDECL(int) RTAsn1Integer_ToString(PRTASN1INTEGER pThis, char pszBuf, size_t cbBuf, uint32_t fFlags, size_t pcbActual)
341	{
342	AssertReturn(RTAsn1Integer_IsPresent(pThis), VERR_INVALID_PARAMETER);
343	AssertReturn(fFlags == 0, VERR_INVALID_FLAGS);
344
345	/*
346	* We only do hex conversions via this API.
347	* Currently we consider all numbers to be unsigned.
348	*/
349	/** @todo Signed ASN.1 INTEGER. */
350	int rc;
351	size_t cbActual;
352	if (pThis->Asn1Core.cb <= 8)
353	{
354	cbActual = 2 + pThis->Asn1Core.cb*2 + 1;
355	if (cbActual <= cbBuf)
356	{
357	ssize_t cchFormat = RTStrFormatU64(pszBuf, cbBuf, pThis->uValue.u, 16, (int)cbActual - 1 /cchWidth/, 0,
358	RTSTR_F_SPECIAL \| RTSTR_F_ZEROPAD);
359	rc = VINF_SUCCESS;
360	AssertStmt(cchFormat == (ssize_t)cbActual - 1, rc = VERR_INTERNAL_ERROR_3);
361	}
362	else
363	rc = VERR_BUFFER_OVERFLOW;
364	}
365	else
366	{
367	cbActual = pThis->Asn1Core.cb * 3 - 1 /* save one separator / + 1 / terminator */;
368	if (cbActual <= cbBuf)
369	{
370	rc = RTStrPrintHexBytes(pszBuf, cbBuf, pThis->Asn1Core.uData.pv, pThis->Asn1Core.cb, RTSTRPRINTHEXBYTES_F_SEP_SPACE);
371	Assert(rc == VINF_SUCCESS);
372	}
373	else
374	rc = VERR_BUFFER_OVERFLOW;
375	}
376	if (pcbActual)
377	*pcbActual = cbActual;
378	return rc;
379	}
380
381
382	/*
383	* ASN.1 INTEGER - Standard Methods.
384	*/
385
386	RT_DECL_DATA_CONST(RTASN1COREVTABLE const) g_RTAsn1Integer_Vtable =
387	{
388	"RTAsn1Integer",
389	sizeof(RTASN1INTEGER),
390	ASN1_TAG_INTEGER,
391	ASN1_TAGCLASS_UNIVERSAL \| ASN1_TAGFLAG_PRIMITIVE,
392	0,
393	(PFNRTASN1COREVTDTOR)RTAsn1Integer_Delete,
394	NULL,
395	(PFNRTASN1COREVTCLONE)RTAsn1Integer_Clone,
396	(PFNRTASN1COREVTCOMPARE)RTAsn1Integer_Compare,
397	(PFNRTASN1COREVTCHECKSANITY)RTAsn1Integer_CheckSanity,
398	NULL,
399	NULL
400	};
401
402
403	RTDECL(int) RTAsn1Integer_Init(PRTASN1INTEGER pThis, PCRTASN1ALLOCATORVTABLE pAllocator)
404	{
405	RT_NOREF_PV(pAllocator);
406	RTAsn1Core_InitEx(&pThis->Asn1Core,
407	ASN1_TAG_INTEGER,
408	ASN1_TAGCLASS_UNIVERSAL \| ASN1_TAGFLAG_PRIMITIVE,
409	&g_RTAsn1Integer_Vtable,
410	RTASN1CORE_F_PRESENT \| RTASN1CORE_F_PRIMITE_TAG_STRUCT);
411	pThis->uValue.u = 1;
412	pThis->Asn1Core.cb = 1;
413	pThis->Asn1Core.uData.pv = (void *)&g_abSmall[0];
414	return VINF_SUCCESS;
415	}
416
417
418	RTDECL(int) RTAsn1Integer_Clone(PRTASN1INTEGER pThis, PCRTASN1INTEGER pSrc, PCRTASN1ALLOCATORVTABLE pAllocator)
419	{
420	AssertPtr(pSrc); AssertPtr(pThis); AssertPtr(pAllocator);
421	RT_ZERO(*pThis);
422	if (RTAsn1Integer_IsPresent(pSrc))
423	{
424	AssertReturn(pSrc->Asn1Core.pOps == &g_RTAsn1Integer_Vtable, VERR_INTERNAL_ERROR_3);
425
426	int rc;
427	if ( pSrc->Asn1Core.cb != 1
428	\|\| pSrc->uValue.u >= RT_ELEMENTS(g_abSmall))
429	{
430	/* Value is too large, copy it. */
431	rc = RTAsn1Core_CloneContent(&pThis->Asn1Core, &pSrc->Asn1Core, pAllocator);
432	if (RT_FAILURE(rc))
433	return rc;
434	}
435	else
436	{
437	/* Use one of the const values. */
438	rc = RTAsn1Core_CloneNoContent(&pThis->Asn1Core, &pSrc->Asn1Core);
439	if (RT_FAILURE(rc))
440	return rc;
441	Assert(g_abSmall[pSrc->uValue.u] == pSrc->uValue.u);
442	pThis->Asn1Core.uData.pv = (void *)&g_abSmall[pSrc->uValue.u];
443	}
444	pThis->uValue.u = pSrc->uValue.u;
445	}
446	return VINF_SUCCESS;
447	}
448
449
450	RTDECL(void) RTAsn1Integer_Delete(PRTASN1INTEGER pThis)
451	{
452	if ( pThis
453	&& RTAsn1Integer_IsPresent(pThis))
454	{
455	Assert(pThis->Asn1Core.pOps == &g_RTAsn1Integer_Vtable);
456
457	RTAsn1ContentFree(&pThis->Asn1Core);
458	RT_ZERO(*pThis);
459	}
460	}
461
462
463	RTDECL(int) RTAsn1Integer_Enum(PRTASN1INTEGER pThis, PFNRTASN1ENUMCALLBACK pfnCallback, uint32_t uDepth, void *pvUser)
464	{
465	RT_NOREF_PV(pThis); RT_NOREF_PV(pfnCallback); RT_NOREF_PV(uDepth); RT_NOREF_PV(pvUser);
466	Assert(pThis && (!RTAsn1Integer_IsPresent(pThis) \|\| pThis->Asn1Core.pOps == &g_RTAsn1Integer_Vtable));
467
468	/* No children to enumerate. */
469	return VINF_SUCCESS;
470	}
471
472
473	RTDECL(int) RTAsn1Integer_Compare(PCRTASN1INTEGER pLeft, PCRTASN1INTEGER pRight)
474	{
475	return RTAsn1Integer_UnsignedCompare(pLeft, pRight);
476	}
477
478
479	RTDECL(int) RTAsn1Integer_CheckSanity(PCRTASN1INTEGER pThis, uint32_t fFlags, PRTERRINFO pErrInfo, const char *pszErrorTag)
480	{
481	RT_NOREF_PV(fFlags);
482	if (RT_UNLIKELY(!RTAsn1Integer_IsPresent(pThis)))
483	return RTErrInfoSetF(pErrInfo, VERR_ASN1_NOT_PRESENT, "%s: Missing (INTEGER).", pszErrorTag);
484	return VINF_SUCCESS;
485	}
486
487
488	/*
489	* Generate code for the associated collection types.
490	*/
491	#define RTASN1TMPL_TEMPLATE_FILE "../common/asn1/asn1-ut-integer-template.h"
492	#include <iprt/asn1-generator-internal-header.h>
493	#include <iprt/asn1-generator-core.h>
494	#include <iprt/asn1-generator-init.h>
495	#include <iprt/asn1-generator-sanity.h>
496

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source: vbox/trunk/src/VBox/Runtime/common/asn1/asn1-ut-integer.cpp@ 72426

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