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1 | .\" $OpenBSD: ASN1_item_sign.3,v 1.3 2024/12/06 12:51:13 schwarze Exp $ | ||
2 | .\" | ||
3 | .\" Copyright (c) 2021 Ingo Schwarze <schwarze@openbsd.org> | ||
4 | .\" | ||
5 | .\" Permission to use, copy, modify, and distribute this software for any | ||
6 | .\" purpose with or without fee is hereby granted, provided that the above | ||
7 | .\" copyright notice and this permission notice appear in all copies. | ||
8 | .\" | ||
9 | .\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | ||
10 | .\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | ||
11 | .\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | ||
12 | .\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | ||
13 | .\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | ||
14 | .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | ||
15 | .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | ||
16 | .\" | ||
17 | .Dd $Mdocdate: December 6 2024 $ | ||
18 | .Dt ASN1_ITEM_SIGN 3 | ||
19 | .Os | ||
20 | .Sh NAME | ||
21 | .Nm ASN1_item_sign , | ||
22 | .Nm ASN1_item_sign_ctx | ||
23 | .Nd DER-encode and sign an ASN.1 value | ||
24 | .Sh SYNOPSIS | ||
25 | .In openssl/x509.h | ||
26 | .Ft int | ||
27 | .Fo ASN1_item_sign | ||
28 | .Fa "const ASN1_ITEM *it" | ||
29 | .Fa "X509_ALGOR *algor1" | ||
30 | .Fa "X509_ALGOR *algor2" | ||
31 | .Fa "ASN1_BIT_STRING *sig_out" | ||
32 | .Fa "void *val_in" | ||
33 | .Fa "EVP_PKEY *pkey" | ||
34 | .Fa "const EVP_MD *type" | ||
35 | .Fc | ||
36 | .Ft int | ||
37 | .Fo ASN1_item_sign_ctx | ||
38 | .Fa "const ASN1_ITEM *it" | ||
39 | .Fa "X509_ALGOR *algor1" | ||
40 | .Fa "X509_ALGOR *algor2" | ||
41 | .Fa "ASN1_BIT_STRING *sig_out" | ||
42 | .Fa "void *val_in" | ||
43 | .Fa "EVP_MD_CTX *ctx" | ||
44 | .Fc | ||
45 | .Sh DESCRIPTION | ||
46 | .Fn ASN1_item_sign | ||
47 | assumes that | ||
48 | .Fa val_in | ||
49 | is an | ||
50 | .Vt ASN1_VALUE | ||
51 | of the type specified by | ||
52 | .Fa it , | ||
53 | encodes it into DER format by calling | ||
54 | .Xr ASN1_item_i2d 3 , | ||
55 | and signs the resulting byte array in a way similar to | ||
56 | .Xr EVP_DigestSign 3 , | ||
57 | using a signing context created with | ||
58 | .Xr EVP_DigestSignInit 3 | ||
59 | for the given digest | ||
60 | .Fa type | ||
61 | and private key | ||
62 | .Fa pkey . | ||
63 | The created signature is placed into the | ||
64 | .Fa sig_out | ||
65 | object provided by the caller, | ||
66 | freeing and replacing any data already contained in that object. | ||
67 | .Pp | ||
68 | .Fn ASN1_item_sign_ctx | ||
69 | is similar except that the provided | ||
70 | .Ft ctx | ||
71 | is used rather than creating a new one. | ||
72 | No matter whether | ||
73 | .Fn ASN1_item_sign_ctx | ||
74 | succeeds or fails, | ||
75 | .Xr EVP_MD_CTX_cleanup 3 | ||
76 | is called on | ||
77 | .Fa ctx | ||
78 | before returning. | ||
79 | .Pp | ||
80 | For both functions, unless | ||
81 | .Fa algor1 | ||
82 | is | ||
83 | .Dv NULL , | ||
84 | its algorithm OID and parameter type are set according to the digest | ||
85 | .Fa type | ||
86 | used, and its parameter value is cleared. | ||
87 | In RSA-PSS mode, the parameter value is also copied into | ||
88 | .Fa algor1 . | ||
89 | Unless | ||
90 | .Fa algor2 | ||
91 | is | ||
92 | .Dv NULL , | ||
93 | the same data is copied into it. | ||
94 | .Sh RETURN VALUES | ||
95 | These functions return the length of the signature in bytes | ||
96 | or 0 if memory allocation, encoding, or signing fails. | ||
97 | .Pp | ||
98 | .Fn ASN1_item_sign_ctx | ||
99 | also fails and returns 0 if | ||
100 | .Fa ctx | ||
101 | is not fully initialized. | ||
102 | .Sh SEE ALSO | ||
103 | .Xr ASN1_BIT_STRING_new 3 , | ||
104 | .Xr ASN1_item_digest 3 , | ||
105 | .Xr ASN1_item_i2d 3 , | ||
106 | .Xr ASN1_item_verify 3 , | ||
107 | .Xr EVP_Digest 3 , | ||
108 | .Xr EVP_DigestSign 3 , | ||
109 | .Xr EVP_MD_CTX_new 3 , | ||
110 | .Xr EVP_PKEY_new 3 , | ||
111 | .Xr OBJ_find_sigid_by_algs 3 , | ||
112 | .Xr X509_ALGOR_new 3 | ||
113 | .Sh HISTORY | ||
114 | .Fn ASN1_item_sign | ||
115 | first appeared in OpenSSL 0.9.7 and has been available since | ||
116 | .Ox 3.1 . | ||
117 | .Pp | ||
118 | .Fn ASN1_item_sign_ctx | ||
119 | first appeared in OpenSSL 1.0.1 and has been available since | ||
120 | .Ox 5.3 . | ||