fido_cbor_info_algorithm_count(3)

1FIDO_CBOR_INFO_NEW(3)    BSD Library Functions Manual    FIDO_CBOR_INFO_NEW(3)
2

NAME

4     fido_cbor_info_new, fido_cbor_info_free, fido_dev_get_cbor_info,
5     fido_cbor_info_aaguid_ptr, fido_cbor_info_extensions_ptr,
6     fido_cbor_info_protocols_ptr, fido_cbor_info_transports_ptr,
7     fido_cbor_info_versions_ptr, fido_cbor_info_options_name_ptr,
8     fido_cbor_info_options_value_ptr, fido_cbor_info_algorithm_type,
9     fido_cbor_info_algorithm_cose, fido_cbor_info_algorithm_count,
10     fido_cbor_info_certs_name_ptr, fido_cbor_info_certs_value_ptr,
11     fido_cbor_info_certs_len, fido_cbor_info_aaguid_len,
12     fido_cbor_info_extensions_len, fido_cbor_info_protocols_len,
13     fido_cbor_info_transports_len, fido_cbor_info_versions_len,
14     fido_cbor_info_options_len, fido_cbor_info_maxmsgsiz,
15     fido_cbor_info_maxcredbloblen, fido_cbor_info_maxcredcntlst,
16     fido_cbor_info_maxcredidlen, fido_cbor_info_maxlargeblob,
17     fido_cbor_info_maxrpid_minpinlen, fido_cbor_info_minpinlen,
18     fido_cbor_info_fwversion, fido_cbor_info_uv_attempts,
19     fido_cbor_info_uv_modality, fido_cbor_info_rk_remaining,
20     fido_cbor_info_new_pin_required — FIDO2 CBOR Info API
21

SYNOPSIS

23     #include <fido.h>
24
25     fido_cbor_info_t *
26     fido_cbor_info_new(void);
27
28     void
29     fido_cbor_info_free(fido_cbor_info_t **ci_p);
30
31     int
32     fido_dev_get_cbor_info(fido_dev_t *dev, fido_cbor_info_t *ci);
33
34     const unsigned char *
35     fido_cbor_info_aaguid_ptr(const fido_cbor_info_t *ci);
36
37     char **
38     fido_cbor_info_extensions_ptr(const fido_cbor_info_t *ci);
39
40     const uint8_t *
41     fido_cbor_info_protocols_ptr(const fido_cbor_info_t *ci);
42
43     char **
44     fido_cbor_info_transports_ptr(const fido_cbor_info_t *ci);
45
46     char **
47     fido_cbor_info_versions_ptr(const fido_cbor_info_t *ci);
48
49     char **
50     fido_cbor_info_options_name_ptr(const fido_cbor_info_t *ci);
51
52     const bool *
53     fido_cbor_info_options_value_ptr(const fido_cbor_info_t *ci);
54
55     const char *
56     fido_cbor_info_algorithm_type(const fido_cbor_info_t *ci, size_t idx);
57
58     int
59     fido_cbor_info_algorithm_cose(const fido_cbor_info_t *ci, size_t idx);
60
61     size_t
62     fido_cbor_info_algorithm_count(const fido_cbor_info_t *ci);
63
64     char **
65     fido_cbor_info_certs_name_ptr(const fido_cbor_info_t *ci);
66
67     const uint64_t *
68     fido_cbor_info_certs_value_ptr(const fido_cbor_info_t *ci);
69
70     size_t
71     fido_cbor_info_certs_len(const fido_cbor_info_t *ci);
72
73     size_t
74     fido_cbor_info_aaguid_len(const fido_cbor_info_t *ci);
75
76     size_t
77     fido_cbor_info_extensions_len(const fido_cbor_info_t *ci);
78
79     size_t
80     fido_cbor_info_protocols_len(const fido_cbor_info_t *ci);
81
82     size_t
83     fido_cbor_info_transports_len(const fido_cbor_info_t *ci);
84
85     size_t
86     fido_cbor_info_versions_len(const fido_cbor_info_t *ci);
87
88     size_t
89     fido_cbor_info_options_len(const fido_cbor_info_t *ci);
90
91     uint64_t
92     fido_cbor_info_maxmsgsiz(const fido_cbor_info_t *ci);
93
94     uint64_t
95     fido_cbor_info_maxcredbloblen(const fido_cbor_info_t *ci);
96
97     uint64_t
98     fido_cbor_info_maxcredcntlst(const fido_cbor_info_t *ci);
99
100     uint64_t
101     fido_cbor_info_maxcredidlen(const fido_cbor_info_t *ci);
102
103     uint64_t
104     fido_cbor_info_maxlargeblob(const fido_cbor_info_t *ci);
105
106     uint64_t
107     fido_cbor_info_maxrpid_minpinlen(const fido_cbor_info_t *ci);
108
109     uint64_t
110     fido_cbor_info_minpinlen(const fido_cbor_info_t *ci);
111
112     uint64_t
113     fido_cbor_info_fwversion(const fido_cbor_info_t *ci);
114
115     uint64_t
116     fido_cbor_info_uv_attempts(const fido_cbor_info_t *ci);
117
118     uint64_t
119     fido_cbor_info_uv_modality(const fido_cbor_info_t *ci);
120
121     int64_t
122     fido_cbor_info_rk_remaining(const fido_cbor_info_t *ci);
123
124     bool
125     fido_cbor_info_new_pin_required(const fido_cbor_info_t *ci);
126

DESCRIPTION

128     The fido_cbor_info_new() function returns a pointer to a newly allocated,
129     empty fido_cbor_info_t type.  If memory cannot be allocated, NULL is re‐
130     turned.
131
132     The fido_cbor_info_free() function releases the memory backing *ci_p,
133     where *ci_p must have been previously allocated by fido_cbor_info_new().
134     On return, *ci_p is set to NULL.  Either ci_p or *ci_p may be NULL, in
135     which case fido_cbor_info_free() is a NOP.
136
137     The fido_dev_get_cbor_info() function transmits a CTAP_CBOR_GETINFO com‐
138     mand to dev and fills ci with attributes retrieved from the command's re‐
139     sponse.  The fido_dev_get_cbor_info() function may block.
140
141     The fido_cbor_info_aaguid_ptr(), fido_cbor_info_extensions_ptr(),
142     fido_cbor_info_protocols_ptr(), fido_cbor_info_transports_ptr(), and
143     fido_cbor_info_versions_ptr() functions return pointers to the authenti‐
144     cator attestation GUID, supported extensions, PIN protocol, transports,
145     and CTAP version strings of ci.  The corresponding length of a given at‐
146     tribute can be obtained by fido_cbor_info_aaguid_len(),
147     fido_cbor_info_extensions_len(), fido_cbor_info_protocols_len(),
148     fido_cbor_info_transports_len(), or fido_cbor_info_versions_len().
149
150     The fido_cbor_info_options_name_ptr() and
151     fido_cbor_info_options_value_ptr() functions return pointers to the array
152     of option names and their respective values in ci.  The length of the op‐
153     tions array is returned by fido_cbor_info_options_len().
154
155     The fido_cbor_info_algorithm_count() function returns the number of sup‐
156     ported algorithms in ci.  The fido_cbor_info_algorithm_cose() function
157     returns the COSE identifier of algorithm idx in ci, or 0 if the COSE
158     identifier is unknown or unset.  The fido_cbor_info_algorithm_type()
159     function returns the type of algorithm idx in ci, or NULL if the type is
160     unset.  Please note that the first algorithm in ci has an idx (index)
161     value of 0.
162
163     The fido_cbor_info_certs_name_ptr() and fido_cbor_info_certs_value_ptr()
164     functions return pointers to the array of certification names and their
165     respective values in ci.  The length of the certifications array is re‐
166     turned by fido_cbor_info_certs_len().
167
168     The fido_cbor_info_maxmsgsiz() function returns the maximum message size
169     attribute of ci.
170
171     The fido_cbor_info_maxcredbloblen() function returns the maximum
172     “credBlob” length in bytes supported by the authenticator as reported in
173     ci.
174
175     The fido_cbor_info_maxcredcntlst() function returns the maximum supported
176     number of credentials in a single credential ID list as reported in ci.
177
178     The fido_cbor_info_maxcredidlen() function returns the maximum supported
179     length of a credential ID as reported in ci.
180
181     The fido_cbor_info_maxrpid_minpinlen() function returns the maximum num‐
182     ber of RP IDs that may be passed to fido_dev_set_pin_minlen_rpid(3), as
183     reported in ci.  The minimum PIN length attribute is a CTAP 2.1 addition.
184     If the attribute is not advertised by the authenticator, the
185     fido_cbor_info_maxrpid_minpinlen() function returns zero.
186
187     The fido_cbor_info_maxlargeblob() function returns the maximum length in
188     bytes of an authenticator's serialized largeBlob array as reported in ci.
189
190     The fido_cbor_info_minpinlen() function returns the minimum PIN length
191     enforced by the authenticator as reported in ci.  The minimum PIN length
192     attribute is a CTAP 2.1 addition.  If the attribute is not advertised by
193     the authenticator, the fido_cbor_info_minpinlen() function returns zero.
194
195     The fido_cbor_info_fwversion() function returns the firmware version at‐
196     tribute of ci.
197
198     The fido_cbor_info_uv_attempts() function returns the number of UV at‐
199     tempts that the platform may attempt before falling back to PIN authenti‐
200     cation.  If 1, then all fido_dev_get_uv_retry_count(3) retries are han‐
201     dled internally by the authenticator and the platform may only attempt
202     non-PIN UV once.  The UV attempts attribute is a CTAP 2.1 addition.  If
203     the attribute is not advertised by the authenticator, the
204     fido_cbor_info_uv_attempts() function returns zero.
205
206     The fido_cbor_info_uv_modality() function returns a bitmask representing
207     different UV modes supported by the authenticator, as defined in the FIDO
208     Registry of Predefined Values and reported in ci.  See the FIDO_UV_MODE_*
209     definitions in <fido/param.h> for the set of values defined by libfido2
210     and a brief description of each.  The UV modality attribute is a CTAP 2.1
211     addition.  If the attribute is not advertised by the authenticator, the
212     fido_cbor_info_uv_modality() function returns zero.
213
214     The fido_cbor_info_rk_remaining() function returns the estimated number
215     of additional resident/discoverable credentials that can be stored on the
216     authenticator as reported in ci.  The estimated number of remaining resi‐
217     dent credentials is a CTAP 2.1 addition.  If the attribute is not adver‐
218     tised by the authenticator, the fido_cbor_info_rk_remaining() function
219     returns -1.
220
221     The fido_cbor_info_new_pin_required() function returns whether a new PIN
222     is required by the authenticator as reported in ci.  If
223     fido_cbor_info_new_pin_required() returns true, operations requiring PIN
224     authentication will fail until a new PIN is set on the authenticator.
225     The fido_dev_set_pin(3) function can be used to set a new PIN.
226
227     A complete example of how to use these functions can be found in the
228     example/info.c file shipped with libfido2.
229

RETURN VALUES

231     The fido_cbor_info_aaguid_ptr(), fido_cbor_info_extensions_ptr(),
232     fido_cbor_info_protocols_ptr(), fido_cbor_info_transports_ptr(),
233     fido_cbor_info_versions_ptr(), fido_cbor_info_options_name_ptr(), and
234     fido_cbor_info_options_value_ptr() functions return NULL if the respec‐
235     tive field in ci is absent.  If not NULL, returned pointers are guaran‐
236     teed to exist until any API function that takes ci without the const
237     qualifier is invoked.
238

NAME

SYNOPSIS

DESCRIPTION

RETURN VALUES

SEE ALSO