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1.\" $OpenBSD: X509_ALGOR_dup.3,v 1.16 2021/07/06 16:05:44 schwarze Exp $
2.\" OpenSSL 4692340e Jun 7 15:49:08 2016 -0400
3.\"
4.\" This file is a derived work.
5.\" The changes are covered by the following Copyright and license:
6.\"
7.\" Copyright (c) 2016 Ingo Schwarze <schwarze@openbsd.org>
8.\"
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19.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20.\"
21.\" The original file was written by Dr. Stephen Henson <steve@openssl.org>.
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68.Dd $Mdocdate: July 6 2021 $
69.Dt X509_ALGOR_DUP 3
70.Os
71.Sh NAME
72.Nm X509_ALGOR_new ,
73.Nm X509_ALGOR_free ,
74.Nm X509_ALGOR_dup ,
75.Nm X509_ALGOR_set0 ,
76.Nm X509_ALGOR_get0 ,
77.Nm X509_ALGOR_set_md ,
78.Nm X509_ALGOR_cmp
79.Nd create, change, and inspect algorithm identifiers
80.Sh SYNOPSIS
81.In openssl/x509.h
82.Ft X509_ALGOR *
83.Fn X509_ALGOR_new void
84.Ft void
85.Fn X509_ALGOR_free "X509_ALGOR *alg"
86.Ft X509_ALGOR *
87.Fo X509_ALGOR_dup
88.Fa "X509_ALGOR *alg"
89.Fc
90.Ft int
91.Fo X509_ALGOR_set0
92.Fa "X509_ALGOR *alg"
93.Fa "ASN1_OBJECT *aobj"
94.Fa "int ptype"
95.Fa "void *pval"
96.Fc
97.Ft void
98.Fo X509_ALGOR_get0
99.Fa "const ASN1_OBJECT **paobj"
100.Fa "int *pptype"
101.Fa "const void **ppval"
102.Fa "const X509_ALGOR *alg"
103.Fc
104.Ft void
105.Fo X509_ALGOR_set_md
106.Fa "X509_ALGOR *alg"
107.Fa "const EVP_MD *md"
108.Fc
109.Ft int
110.Fo X509_ALGOR_cmp
111.Fa "const X509_ALGOR *a"
112.Fa "const X509_ALGOR *b"
113.Fc
114.Sh DESCRIPTION
115.Fn X509_ALGOR_new
116allocates and initializes an empty
117.Vt X509_ALGOR
118object, representing an ASN.1
119.Vt AlgorithmIdentifier
120structure defined in RFC 5280 section 4.1.1.2.
121Such objects can specify a cryptographic algorithm together
122with algorithm-specific parameters.
123They are used by many other objects, for example certificates,
124certificate revocation lists, and certificate requests.
125.Pp
126.Fn X509_ALGOR_free
127frees
128.Fa alg .
129.Pp
130.Fn X509_ALGOR_dup
131copies
132.Fa alg
133by calling
134.Xr i2d_X509_ALGOR 3
135and
136.Xr d2i_X509_ALGOR 3 .
137.Pp
138.Fn X509_ALGOR_set0
139sets the algorithm OID of
140.Fa alg
141to
142.Fa aobj
143and the associated parameter type to
144.Fa ptype
145with value
146.Fa pval .
147If
148.Fa ptype
149is
150.Dv V_ASN1_UNDEF
151the parameter is omitted, otherwise
152.Fa ptype
153and
154.Fa pval
155have the same meaning as the
156.Fa type
157and
158.Fa value
159parameters to
160.Xr ASN1_TYPE_set 3 .
161All the supplied parameters are used internally so must
162.Sy NOT
163be freed after this call.
164.Pp
165.Fn X509_ALGOR_get0
166is the inverse of
167.Fn X509_ALGOR_set0 :
168it returns the algorithm OID in
169.Pf * Fa paobj
170and the associated parameter in
171.Pf * Fa pptype
172and
173.Pf * Fa ppval
174from
175.Fa alg .
176.Pp
177.Fn X509_ALGOR_set_md
178sets
179.Fa alg
180to appropriate values for the message digest
181.Fa md .
182.Pp
183.Fn X509_ALGOR_cmp
184compares
185.Fa a
186and
187.Fa b .
188.Sh RETURN VALUES
189.Fn X509_ALGOR_new
190and
191.Fn X509_ALGOR_dup
192return a new
193.Vt X509_ALGOR
194object or
195.Dv NULL
196if an error occurs.
197.Pp
198.Fn X509_ALGOR_set0
199returns 1 for success or 0 for failure.
200.Pp
201.Fn X509_ALGOR_cmp
202returns 0 if
203.Fa a
204and
205.Fa b
206have identical encodings or non-zero otherwise.
207.Sh SEE ALSO
208.Xr ASN1_TYPE_set 3 ,
209.Xr d2i_X509_ALGOR 3 ,
210.Xr EVP_DigestInit 3 ,
211.Xr X509_get0_signature 3 ,
212.Xr X509_new 3 ,
213.Xr X509_PUBKEY_get0_param 3 ,
214.Xr X509_signature_dump 3
215.Sh STANDARDS
216RFC 5280: Internet X.509 Public Key Infrastructure Certificate and
217Certificate Revocation List (CRL) Profile
218.Sh HISTORY
219.Fn X509_ALGOR_new
220and
221.Fn X509_ALGOR_free
222appeared in SSLeay 0.4 or earlier and have been available since
223.Ox 2.4 .
224.Pp
225.Fn X509_ALGOR_dup
226first appeared in SSLeay 0.9.1 and has been available since
227.Ox 2.6 .
228.Pp
229.Fn X509_ALGOR_set0
230and
231.Fn X509_ALGOR_get0
232first appeared in OpenSSL 0.9.8h and have been available since
233.Ox 4.5 .
234.Pp
235.Fn X509_ALGOR_cmp
236first appeared in OpenSSL 0.9.8zd, 1.0.0p, and 1.0.1k
237and has been available since
238.Ox 4.9 .
239.Pp
240.Fn X509_ALGOR_set_md
241first appeared in OpenSSL 1.0.1 and has been available since
242.Ox 5.3 .
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