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
|
.\" $OpenBSD: ASN1_item_verify.3,v 1.3 2021/12/18 17:47:44 schwarze Exp $
.\"
.\" Copyright (c) 2021 Ingo Schwarze <schwarze@openbsd.org>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd $Mdocdate: December 18 2021 $
.Dt ASN1_ITEM_VERIFY 3
.Os
.Sh NAME
.Nm ASN1_item_verify
.Nd signature verification for ASN.1 values
.Sh SYNOPSIS
.In openssl/x509.h
.Ft int
.Fo ASN1_item_verify
.Fa "const ASN1_ITEM *it"
.Fa "X509_ALGOR *algor1"
.Fa "ASN1_BIT_STRING *sig_in"
.Fa "void *val_in"
.Fa "EVP_PKEY *pkey"
.Fc
.Sh DESCRIPTION
.Fn ASN1_item_verify
assumes that
.Fa val_in
is an
.Ft ASN1_VALUE
of the type specified by
.Fa it ,
encodes it into DER format by calling
.Xr ASN1_item_i2d 3 ,
and verifies in a way similar to
.Xr EVP_DigestVerify 3
that
.Fa sig_in
contains a valid signature of the resulting byte array,
a signature that was created with the signature algorithm
.Fa algor1
and the private key corresponding to the public key
.Fa pkey .
.Sh RETURN VALUES
.Fn ASN1_item_verify
returns 1 if signature verification succeeds, 0 if signature verification
fails, or \-1 if
.Fa pkey
is
.Dv NULL ,
if
.Fa sig_in
contains invalid flags, or if
.Fa algor1
requests an invalid or unsupported digest algorithm
or does not work with the given
.Fa pkey .
.Sh SEE ALSO
.Xr ASN1_BIT_STRING_new 3 ,
.Xr ASN1_item_i2d 3 ,
.Xr ASN1_item_sign 3 ,
.Xr EVP_DigestVerify 3 ,
.Xr EVP_PKEY_new 3 ,
.Xr OBJ_find_sigid_algs 3 ,
.Xr X509_ALGOR_new 3
.Sh HISTORY
.Fn ASN1_item_verify
first appeared in OpenSSL 0.9.7 and has been available since
.Ox 3.1 .
|
