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authorcvs2svn <admin@example.com>2025-04-14 17:32:06 +0000
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1.\" $OpenBSD: DSA_new.3,v 1.14 2023/12/29 19:12:47 tb Exp $
2.\" OpenSSL b97fdb57 Nov 11 09:33:09 2016 +0100
3.\"
4.\" This file was written by Ulf Moeller <ulf@openssl.org>.
5.\" Copyright (c) 2000, 2002 The OpenSSL Project. All rights reserved.
6.\"
7.\" Redistribution and use in source and binary forms, with or without
8.\" modification, are permitted provided that the following conditions
9.\" are met:
10.\"
11.\" 1. Redistributions of source code must retain the above copyright
12.\" notice, this list of conditions and the following disclaimer.
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50.\"
51.Dd $Mdocdate: December 29 2023 $
52.Dt DSA_NEW 3
53.Os
54.Sh NAME
55.Nm DSA_new ,
56.Nm DSA_up_ref ,
57.Nm DSA_free
58.Nd allocate and free DSA objects
59.Sh SYNOPSIS
60.In openssl/dsa.h
61.Ft DSA*
62.Fn DSA_new void
63.Ft int
64.Fo DSA_up_ref
65.Fa "DSA *dsa"
66.Fc
67.Ft void
68.Fo DSA_free
69.Fa "DSA *dsa"
70.Fc
71.Sh DESCRIPTION
72The DSA functions implement the Digital Signature Algorithm.
73.Pp
74.Fn DSA_new
75allocates and initializes a
76.Vt DSA
77structure, setting the reference count to 1.
78It is equivalent to calling
79.Xr DSA_new_method 3
80with a
81.Dv NULL
82argument.
83.Pp
84.Fn DSA_up_ref
85increments the reference count by 1.
86.Pp
87.Fn DSA_free
88decrements the reference count by 1.
89If it reaches 0, it frees the
90.Vt DSA
91structure and its components.
92The values are erased before the memory is returned to the system.
93If
94.Fa dsa
95is a
96.Dv NULL
97pointer, no action occurs.
98.Sh RETURN VALUES
99If the allocation fails,
100.Fn DSA_new
101returns
102.Dv NULL
103and sets an error code that can be obtained by
104.Xr ERR_get_error 3 .
105Otherwise it returns a pointer to the newly allocated structure.
106.Pp
107.Fn DSA_up_ref
108returns 1 for success or 0 for failure.
109.Sh SEE ALSO
110.Xr BN_new 3 ,
111.Xr crypto 3 ,
112.Xr d2i_DSAPublicKey 3 ,
113.Xr DH_new 3 ,
114.Xr DSA_do_sign 3 ,
115.Xr DSA_dup_DH 3 ,
116.Xr DSA_generate_key 3 ,
117.Xr DSA_generate_parameters_ex 3 ,
118.Xr DSA_get0_pqg 3 ,
119.Xr DSA_get_ex_new_index 3 ,
120.Xr DSA_meth_new 3 ,
121.Xr DSA_print 3 ,
122.Xr DSA_security_bits 3 ,
123.Xr DSA_set_method 3 ,
124.Xr DSA_SIG_new 3 ,
125.Xr DSA_sign 3 ,
126.Xr DSA_size 3 ,
127.Xr EVP_PKEY_set1_DSA 3 ,
128.Xr RSA_new 3
129.Sh STANDARDS
130US Federal Information Processing Standard FIPS 186 (Digital Signature
131Standard, DSS), ANSI X9.30
132.Sh HISTORY
133.Fn DSA_new
134and
135.Fn DSA_free
136first appeared in SSLeay 0.6.0 and have been available since
137.Ox 2.4 .
138.Pp
139.Fn DSA_up_ref
140first appeared in OpenSSL 0.9.7 and has been available since
141.Ox 3.2 .