1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
|
.\" Automatically generated by Pod::Man 4.14 (Pod::Simple 3.40)
.\"
.\" Standard preamble:
.\" ========================================================================
.de Sp \" Vertical space (when we can't use .PP)
.if t .sp .5v
.if n .sp
..
.de Vb \" Begin verbatim text
.ft CW
.nf
.ne \\$1
..
.de Ve \" End verbatim text
.ft R
.fi
..
.\" Set up some character translations and predefined strings. \*(-- will
.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
.\" double quote, and \*(R" will give a right double quote. \*(C+ will
.\" give a nicer C++. Capital omega is used to do unbreakable dashes and
.\" therefore won't be available. \*(C` and \*(C' expand to `' in nroff,
.\" nothing in troff, for use with C<>.
.tr \(*W-
.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
.ie n \{\
. ds -- \(*W-
. ds PI pi
. if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
. if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch
. ds L" ""
. ds R" ""
. ds C` ""
. ds C' ""
'br\}
.el\{\
. ds -- \|\(em\|
. ds PI \(*p
. ds L" ``
. ds R" ''
. ds C`
. ds C'
'br\}
.\"
.\" Escape single quotes in literal strings from groff's Unicode transform.
.ie \n(.g .ds Aq \(aq
.el .ds Aq '
.\"
.\" If the F register is >0, we'll generate index entries on stderr for
.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
.\" entries marked with X<> in POD. Of course, you'll have to process the
.\" output yourself in some meaningful fashion.
.\"
.\" Avoid warning from groff about undefined register 'F'.
.de IX
..
.nr rF 0
.if \n(.g .if rF .nr rF 1
.if (\n(rF:(\n(.g==0)) \{\
. if \nF \{\
. de IX
. tm Index:\\$1\t\\n%\t"\\$2"
..
. if !\nF==2 \{\
. nr % 0
. nr F 2
. \}
. \}
.\}
.rr rF
.\"
.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
.\" Fear. Run. Save yourself. No user-serviceable parts.
. \" fudge factors for nroff and troff
.if n \{\
. ds #H 0
. ds #V .8m
. ds #F .3m
. ds #[ \f1
. ds #] \fP
.\}
.if t \{\
. ds #H ((1u-(\\\\n(.fu%2u))*.13m)
. ds #V .6m
. ds #F 0
. ds #[ \&
. ds #] \&
.\}
. \" simple accents for nroff and troff
.if n \{\
. ds ' \&
. ds ` \&
. ds ^ \&
. ds , \&
. ds ~ ~
. ds /
.\}
.if t \{\
. ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u"
. ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u'
. ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u'
. ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
. ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
. ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u'
.\}
. \" troff and (daisy-wheel) nroff accents
.ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V'
.ds 8 \h'\*(#H'\(*b\h'-\*(#H'
.ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#]
.ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
.ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u'
.ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
.ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
.ds ae a\h'-(\w'a'u*4/10)'e
.ds Ae A\h'-(\w'A'u*4/10)'E
. \" corrections for vroff
.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
.if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
. \" for low resolution devices (crt and lpr)
.if \n(.H>23 .if \n(.V>19 \
\{\
. ds : e
. ds 8 ss
. ds o a
. ds d- d\h'-1'\(ga
. ds D- D\h'-1'\(hy
. ds th \o'bp'
. ds Th \o'LP'
. ds ae ae
. ds Ae AE
.\}
.rm #[ #] #H #V #F C
.\" ========================================================================
.\"
.IX Title "X509_GET0_SIGNATURE 3"
.TH X509_GET0_SIGNATURE 3 "2022-06-21" "1.1.1p" "OpenSSL"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
X509_get0_signature, X509_REQ_set0_signature, X509_REQ_set1_signature_algo, X509_get_signature_nid, X509_get0_tbs_sigalg, X509_REQ_get0_signature, X509_REQ_get_signature_nid, X509_CRL_get0_signature, X509_CRL_get_signature_nid, X509_get_signature_info, X509_SIG_INFO_get, X509_SIG_INFO_set \- signature information
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/x509.h>
\&
\& void X509_get0_signature(const ASN1_BIT_STRING **psig,
\& const X509_ALGOR **palg,
\& const X509 *x);
\& void X509_REQ_set0_signature(X509_REQ *req, ASN1_BIT_STRING *psig);
\& int X509_REQ_set1_signature_algo(X509_REQ *req, X509_ALGOR *palg);
\& int X509_get_signature_nid(const X509 *x);
\& const X509_ALGOR *X509_get0_tbs_sigalg(const X509 *x);
\&
\& void X509_REQ_get0_signature(const X509_REQ *crl,
\& const ASN1_BIT_STRING **psig,
\& const X509_ALGOR **palg);
\& int X509_REQ_get_signature_nid(const X509_REQ *crl);
\&
\& void X509_CRL_get0_signature(const X509_CRL *crl,
\& const ASN1_BIT_STRING **psig,
\& const X509_ALGOR **palg);
\& int X509_CRL_get_signature_nid(const X509_CRL *crl);
\&
\& int X509_get_signature_info(X509 *x, int *mdnid, int *pknid, int *secbits,
\& uint32_t *flags);
\&
\& int X509_SIG_INFO_get(const X509_SIG_INFO *siginf, int *mdnid, int *pknid,
\& int *secbits, uint32_t *flags);
\& void X509_SIG_INFO_set(X509_SIG_INFO *siginf, int mdnid, int pknid,
\& int secbits, uint32_t flags);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBX509_get0_signature()\fR sets \fB*psig\fR to the signature of \fBx\fR and \fB*palg\fR
to the signature algorithm of \fBx\fR. The values returned are internal
pointers which \fB\s-1MUST NOT\s0\fR be freed up after the call.
.PP
\&\fBX509_set0_signature()\fR and \fBX509_REQ_set1_signature_algo()\fR are the
equivalent setters for the two values of \fBX509_get0_signature()\fR.
.PP
\&\fBX509_get0_tbs_sigalg()\fR returns the signature algorithm in the signed
portion of \fBx\fR.
.PP
\&\fBX509_get_signature_nid()\fR returns the \s-1NID\s0 corresponding to the signature
algorithm of \fBx\fR.
.PP
\&\fBX509_REQ_get0_signature()\fR, \fBX509_REQ_get_signature_nid()\fR
\&\fBX509_CRL_get0_signature()\fR and \fBX509_CRL_get_signature_nid()\fR perform the
same function for certificate requests and CRLs.
.PP
\&\fBX509_get_signature_info()\fR retrieves information about the signature of
certificate \fBx\fR. The \s-1NID\s0 of the signing digest is written to \fB*mdnid\fR,
the public key algorithm to \fB*pknid\fR, the effective security bits to
\&\fB*secbits\fR and flag details to \fB*flags\fR. Any of the parameters can
be set to \fB\s-1NULL\s0\fR if the information is not required.
.PP
\&\fBX509_SIG_INFO_get()\fR and \fBX509_SIG_INFO_set()\fR get and set information
about a signature in an \fBX509_SIG_INFO\fR structure. They are only
used by implementations of algorithms which need to set custom
signature information: most applications will never need to call
them.
.SH "NOTES"
.IX Header "NOTES"
These functions provide lower level access to signatures in certificates
where an application wishes to analyse or generate a signature in a form
where \fBX509_sign()\fR et al is not appropriate (for example a non standard
or unsupported format).
.PP
The security bits returned by \fBX509_get_signature_info()\fR refers to information
available from the certificate signature (such as the signing digest). In some
cases the actual security of the signature is less because the signing
key is less secure: for example a certificate signed using \s-1SHA\-512\s0 and a
1024 bit \s-1RSA\s0 key.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBX509_get_signature_nid()\fR, \fBX509_REQ_get_signature_nid()\fR and
\&\fBX509_CRL_get_signature_nid()\fR return a \s-1NID.\s0
.PP
\&\fBX509_get0_signature()\fR, \fBX509_REQ_get0_signature()\fR and
\&\fBX509_CRL_get0_signature()\fR do not return values.
.PP
\&\fBX509_get_signature_info()\fR returns 1 if the signature information
returned is valid or 0 if the information is not available (e.g.
unknown algorithms or malformed parameters).
.PP
\&\fBX509_REQ_set1_signature_algo()\fR returns 0 on success; or 1 on an
error (e.g. null \s-1ALGO\s0 pointer). X509_REQ_set0_signature does
not return an error value.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBd2i_X509\fR\|(3),
\&\fBERR_get_error\fR\|(3),
\&\fBX509_CRL_get0_by_serial\fR\|(3),
\&\fBX509_get_ext_d2i\fR\|(3),
\&\fBX509_get_extension_flags\fR\|(3),
\&\fBX509_get_pubkey\fR\|(3),
\&\fBX509_get_subject_name\fR\|(3),
\&\fBX509_get_version\fR\|(3),
\&\fBX509_NAME_add_entry_by_txt\fR\|(3),
\&\fBX509_NAME_ENTRY_get_object\fR\|(3),
\&\fBX509_NAME_get_index_by_NID\fR\|(3),
\&\fBX509_NAME_print_ex\fR\|(3),
\&\fBX509_new\fR\|(3),
\&\fBX509_sign\fR\|(3),
\&\fBX509V3_get_d2i\fR\|(3),
\&\fBX509_verify_cert\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
The
\&\fBX509_get0_signature()\fR and \fBX509_get_signature_nid()\fR functions were
added in OpenSSL 1.0.2.
.PP
The
\&\fBX509_REQ_get0_signature()\fR, \fBX509_REQ_get_signature_nid()\fR,
\&\fBX509_CRL_get0_signature()\fR and \fBX509_CRL_get_signature_nid()\fR were
added in OpenSSL 1.1.0.
.PP
The \fBX509_REQ_set0_signature()\fR and \fBX509_REQ_set1_signature_algo()\fR
were added in OpenSSL 1.1.1e.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2015\-2020 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.
|
