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1.\" $OpenBSD: ASN1_INTEGER_get.3,v 1.7 2023/05/22 19:38:04 tb Exp $
2.\" selective merge up to:
3.\" OpenSSL man3/ASN1_INTEGER_get_int64 24a535ea Sep 22 13:14:20 2020 +0100
4.\"
5.\" This file is a derived work.
6.\" The changes are covered by the following Copyright and license:
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8.\" Copyright (c) 2018, 2021, 2022 Ingo Schwarze <schwarze@openbsd.org>
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21.\"
22.\" The original file was written by Dr. Stephen Henson <steve@openssl.org>.
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68.\"
69.Dd $Mdocdate: May 22 2023 $
70.Dt ASN1_INTEGER_GET 3
71.Os
72.Sh NAME
73.Nm ASN1_INTEGER_get_uint64 ,
74.Nm ASN1_INTEGER_get_int64 ,
75.Nm ASN1_INTEGER_get ,
76.Nm ASN1_INTEGER_set_uint64 ,
77.Nm ASN1_INTEGER_set_int64 ,
78.Nm ASN1_INTEGER_set ,
79.Nm ASN1_INTEGER_cmp ,
80.Nm ASN1_INTEGER_dup ,
81.Nm BN_to_ASN1_INTEGER ,
82.Nm ASN1_INTEGER_to_BN ,
83.Nm ASN1_ENUMERATED_get_int64 ,
84.Nm ASN1_ENUMERATED_get ,
85.Nm ASN1_ENUMERATED_set_int64 ,
86.Nm ASN1_ENUMERATED_set ,
87.Nm BN_to_ASN1_ENUMERATED ,
88.Nm ASN1_ENUMERATED_to_BN
89.Nd ASN.1 INTEGER and ENUMERATED utilities
90.Sh SYNOPSIS
91.In openssl/asn1.h
92.Ft int
93.Fo ASN1_INTEGER_get_uint64
94.Fa "uint64_t *out_val"
95.Fa "const ASN1_INTEGER *a"
96.Fc
97.Ft int
98.Fo ASN1_INTEGER_get_int64
99.Fa "int64_t *out_val"
100.Fa "const ASN1_INTEGER *a"
101.Fc
102.Ft long
103.Fo ASN1_INTEGER_get
104.Fa "const ASN1_INTEGER *a"
105.Fc
106.Ft int
107.Fo ASN1_INTEGER_set_uint64
108.Fa "ASN1_INTEGER *a"
109.Fa "uint64_t v"
110.Fc
111.Ft int
112.Fo ASN1_INTEGER_set_int64
113.Fa "ASN1_INTEGER *a"
114.Fa "int64_t v"
115.Fc
116.Ft int
117.Fo ASN1_INTEGER_set
118.Fa "ASN1_INTEGER *a"
119.Fa "long v"
120.Fc
121.Ft int
122.Fo ASN1_INTEGER_cmp
123.Fa "const ASN1_INTEGER *a1"
124.Fa "const ASN1_INTEGER *a2"
125.Fc
126.Ft ASN1_INTEGER *
127.Fo ASN1_INTEGER_dup
128.Fa "const ASN1_INTEGER *a"
129.Fc
130.Ft ASN1_INTEGER *
131.Fo BN_to_ASN1_INTEGER
132.Fa "const BIGNUM *bn"
133.Fa "ASN1_INTEGER *ai"
134.Fc
135.Ft BIGNUM *
136.Fo ASN1_INTEGER_to_BN
137.Fa "const ASN1_INTEGER *ai"
138.Fa "BIGNUM *bn"
139.Fc
140.Ft int
141.Fo ASN1_ENUMERATED_get_int64
142.Fa "int64_t *out_val"
143.Fa "const ASN1_ENUMERATED *a"
144.Fc
145.Ft long
146.Fo ASN1_ENUMERATED_get
147.Fa "const ASN1_ENUMERATED *a"
148.Fc
149.Ft int
150.Fo ASN1_ENUMERATED_set_int64
151.Fa "ASN1_ENUMERATED *a"
152.Fa "int64_t v"
153.Fc
154.Ft int
155.Fo ASN1_ENUMERATED_set
156.Fa "ASN1_ENUMERATED *a"
157.Fa "long v"
158.Fc
159.Ft ASN1_ENUMERATED *
160.Fo BN_to_ASN1_ENUMERATED
161.Fa "const BIGNUM *bn"
162.Fa "ASN1_ENUMERATED *ai"
163.Fc
164.Ft BIGNUM *
165.Fo ASN1_ENUMERATED_to_BN
166.Fa "const ASN1_ENUMERATED *ai"
167.Fa "BIGNUM *bn"
168.Fc
169.Sh DESCRIPTION
170These functions convert to and from
171.Vt ASN1_INTEGER
172and
173.Vt ASN1_ENUMERATED
174objects.
175.Pp
176.Fn ASN1_INTEGER_get_uint64
177and
178.Fn ASN1_INTEGER_get_int64
179store the value of
180.Fa a
181in
182.Pf * Fa out_val
183if successful.
184.Pp
185The deprecated function
186.Fn ASN1_INTEGER_get
187converts
188.Fa a
189to the
190.Vt long
191type.
192.Pp
193.Fn ASN1_INTEGER_set_uint64 ,
194.Fn ASN1_INTEGER_set_int64 ,
195and
196.Fn ASN1_INTEGER_set
197set the type of
198.Fa a
199to
200.Dv V_ASN1_INTEGER
201or
202.Dv V_ASN1_NEG_INTEGER
203depending on the sign of
204.Fa v
205and set the value of
206.Fa a
207to
208.Fa v .
209.Pp
210.Fn ASN1_INTEGER_cmp
211compares the signed integer numbers represented by
212.Fa a1
213and
214.Fa a2 .
215.Pp
216.Fn ASN1_INTEGER_dup
217does exactly the same as
218.Xr ASN1_STRING_dup 3
219without providing any type safety,
220except that it fails if the
221.Xr ASN1_STRING_length 3
222of
223.Fa a
224is 0.
225.Pp
226.Fn BN_to_ASN1_INTEGER
227converts
228.Fa bn
229to an
230.Vt ASN1_INTEGER .
231If
232.Fa ai
233is
234.Dv NULL ,
235a new
236.Vt ASN1_INTEGER
237object is returned.
238Otherwise, the existing object
239.Fa ai
240is used instead.
241.Pp
242.Fn ASN1_INTEGER_to_BN
243converts
244.Fa ai
245into a
246.Vt BIGNUM .
247If
248.Fa bn
249is
250.Dv NULL ,
251a new
252.Vt BIGNUM
253object is returned.
254Otherwise, the existing object
255.Fa bn
256is used instead.
257.Pp
258.Fn ASN1_ENUMERATED_get_int64 ,
259.Fn ASN1_ENUMERATED_get ,
260.Fn ASN1_ENUMERATED_set_int64 ,
261.Fn ASN1_ENUMERATED_set ,
262.Fn BN_to_ASN1_ENUMERATED ,
263and
264.Fn ASN1_ENUMERATED_to_BN
265behave like their
266.Vt ASN1_INTEGER
267counterparts except that they operate on an
268.Vt ASN1_ENUMERATED
269object.
270.Sh RETURN VALUES
271.Fn ASN1_INTEGER_get_uint64
272returns 1 in case of success or 0 if
273.Fa a
274is not of the type
275.Dv V_ASN1_INTEGER
276or greater than
277.Dv UINT64_MAX .
278.Pp
279.Fn ASN1_INTEGER_get_int64
280returns 1 in case of success or 0 if
281.Fa a
282is not of the type
283.Dv V_ASN1_INTEGER
284or
285.Dv V_ASN1_NEG_INTEGER ,
286less than
287.Dv INT64_MIN ,
288or greater than
289.Dv INT64_MAX .
290.Pp
291.Fn ASN1_INTEGER_get
292and
293.Fn ASN1_ENUMERATED_get
294return the converted value, 0 if
295.Fa a
296is
297.Dv NULL ,
298or \-1 on error, which is ambiguous because \-1 is a legitimate
299value for an
300.Vt ASN1_INTEGER .
301.Pp
302.Fn ASN1_INTEGER_set_uint64 ,
303.Fn ASN1_INTEGER_set_int64 ,
304.Fn ASN1_INTEGER_set ,
305.Fn ASN1_ENUMERATED_set_int64 ,
306and
307.Fn ASN1_ENUMERATED_set
308return 1 for success or 0 for failure.
309They only fail if a memory allocation error occurs.
310.Pp
311.Fn ASN1_INTEGER_cmp
312returns a value greater than, equal to, or less than 0
313if the signed integer number represented by
314.Fa a1
315is greater than, equal to, or less than
316the signed integer number represented by
317.Fa a2 ,
318respectively.
319.Pp
320.Fn ASN1_INTEGER_dup
321returns a pointer to a newly allocated
322.Vt ASN1_STRING
323structure or
324.Dv NULL
325if
326.Fa a
327is a
328.Dv NULL
329pointer, if the length of
330.Fa a
331is 0, or if memory allocation fails.
332.Pp
333.Fn BN_to_ASN1_INTEGER
334and
335.Fn BN_to_ASN1_ENUMERATED
336return an
337.Vt ASN1_INTEGER
338or
339.Vt ASN1_ENUMERATED
340object, respectively, or
341.Dv NULL
342if an error occurs.
343They only fail due to memory allocation errors.
344.Pp
345.Fn ASN1_INTEGER_to_BN
346and
347.Fn ASN1_ENUMERATED_to_BN
348return a
349.Vt BIGNUM
350object of
351.Dv NULL
352if an error occurs.
353They can fail if the passed type is incorrect (due to a programming error)
354or due to memory allocation failures.
355.Sh SEE ALSO
356.Xr ASN1_INTEGER_new 3 ,
357.Xr ASN1_STRING_length 3
358.Sh HISTORY
359.Fn ASN1_INTEGER_set
360first appeared in SSLeay 0.5.1.
361.Fn ASN1_INTEGER_get ,
362.Fn BN_to_ASN1_INTEGER ,
363and
364.Fn ASN1_INTEGER_to_BN
365first appeared in SSLeay 0.6.0.
366.Fn ASN1_INTEGER_cmp
367and
368.Fn ASN1_INTEGER_dup
369first appeared in SSLeay 0.6.5.
370These functions have been available since
371.Ox 2.3 .
372.Pp
373.Fn ASN1_ENUMERATED_get ,
374.Fn ASN1_ENUMERATED_set ,
375.Fn BN_to_ASN1_ENUMERATED ,
376and
377.Fn ASN1_ENUMERATED_to_BN
378first appeared in OpenSSL 0.9.2b and have been available since
379.Ox 2.6 .
380.Pp
381.Fn ASN1_INTEGER_get_uint64 ,
382.Fn ASN1_INTEGER_get_int64 ,
383.Fn ASN1_INTEGER_set_uint64 ,
384.Fn ASN1_INTEGER_set_int64 ,
385.Fn ASN1_ENUMERATED_get_int64 ,
386and
387.Fn ASN1_ENUMERATED_set_int64
388first appeared in OpenSSL 1.1.0 and have been available since
389.Ox 7.2 .
390.Sh CAVEATS
391In general an
392.Vt ASN1_INTEGER
393or
394.Vt ASN1_ENUMERATED
395type can contain an integer of almost arbitrary size
396and so cannot always be represented by a C
397.Vt long
398type.
399The ambiguous return values of
400.Fn ASN1_INTEGER_get
401and
402.Fn ASN1_ENUMERATED_get
403imply that these functions should be avoided if possible.
404.Sh BUGS
405.Fn ASN1_INTEGER_cmp ,
406.Fn ASN1_INTEGER_dup ,
407and
408.Fn ASN1_INTEGER_to_BN
409do not check whether their arguments are really of the type
410.Dv V_ASN1_INTEGER
411or
412.Dv V_ASN1_NEG_INTEGER .
413They may report success even if their arguments are of a wrong type.
414Consequently, even in case of success, the return value of
415.Fn ASN1_INTEGER_dup
416is not guaranteed to be of the type
417.Dv V_ASN1_INTEGER
418or
419.Dv V_ASN1_NEG_INTEGER
420either.
421.Pp
422Similarly,
423.Fn ASN1_ENUMERATED_to_BN
424does not check whether its argument is really of the type
425.Dv V_ASN1_ENUMERATED
426or
427.Dv V_ASN1_NEG_ENUMERATED
428and may report success even if the argument is of a wrong type.
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-12-23 15:38:39 +0000