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1.\" $OpenBSD: X509_get_pubkey.3,v 1.13 2022/03/31 17:27:17 naddy Exp $
2.\" selective merge up to: OpenSSL 99d63d46 Oct 26 13:56:48 2016 -0400
3.\"
4.\" This file is a derived work.
5.\" The changes are covered by the following Copyright and license:
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7.\" Copyright (c) 2020, 2021 Ingo Schwarze <schwarze@openbsd.org>
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21.\" The original file was written by Dr. Stephen Henson <steve@openssl.org>.
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68.Dd $Mdocdate: March 31 2022 $
69.Dt X509_GET_PUBKEY 3
70.Os
71.Sh NAME
72.Nm X509_get_pubkey ,
73.Nm X509_get0_pubkey ,
74.Nm X509_set_pubkey ,
75.Nm X509_get_X509_PUBKEY ,
76.Nm X509_get0_pubkey_bitstr ,
77.Nm X509_REQ_get_pubkey ,
78.Nm X509_REQ_get0_pubkey ,
79.Nm X509_REQ_set_pubkey ,
80.Nm X509_extract_key ,
81.Nm X509_REQ_extract_key
82.Nd get or set certificate or certificate request public key
83.Sh SYNOPSIS
84.In openssl/x509.h
85.Ft EVP_PKEY *
86.Fo X509_get_pubkey
87.Fa "X509 *x"
88.Fc
89.Ft EVP_PKEY *
90.Fo X509_get0_pubkey
91.Fa "const X509 *x"
92.Fc
93.Ft int
94.Fo X509_set_pubkey
95.Fa "X509 *x"
96.Fa "EVP_PKEY *pkey"
97.Fc
98.Ft X509_PUBKEY *
99.Fo X509_get_X509_PUBKEY
100.Fa "const X509 *x"
101.Fc
102.Ft ASN1_BIT_STRING *
103.Fo X509_get0_pubkey_bitstr
104.Fa "const X509 *x"
105.Fc
106.Ft EVP_PKEY *
107.Fo X509_REQ_get_pubkey
108.Fa "X509_REQ *req"
109.Fc
110.Ft EVP_PKEY *
111.Fo X509_REQ_get0_pubkey
112.Fa "X509_REQ *req"
113.Fc
114.Ft int
115.Fo X509_REQ_set_pubkey
116.Fa "X509_REQ *x"
117.Fa "EVP_PKEY *pkey"
118.Fc
119.Ft EVP_PKEY *
120.Fo X509_extract_key
121.Fa "X509 *x"
122.Fc
123.Ft EVP_PKEY *
124.Fo X509_REQ_extract_key
125.Fa "X509_REQ *req"
126.Fc
127.Sh DESCRIPTION
128.Fn X509_get_pubkey
129attempts to decode the public key for certificate
130.Fa x .
131If successful, it returns the public key as an
132.Vt EVP_PKEY
133pointer with its reference count incremented: this means the returned
134key must be freed up after use.
135.Fn X509_get0_pubkey
136is similar except that it does not increment the reference count
137of the returned
138.Vt EVP_PKEY ,
139so it must not be freed up after use.
140.Pp
141.Fn X509_get_X509_PUBKEY
142returns an internal pointer to the
143.Vt SubjectPublicKeyInfo
144structure contained in
145.Fa x .
146The returned value must not be freed up after use.
147.Pp
148.Fn X509_get0_pubkey_bitstr
149returns an internal pointer to just the public key contained in this
150.Vt SubjectPublicKeyInfo
151structure, without the information about the algorithm used.
152.Pp
153.Fn X509_set_pubkey
154attempts to set the public key for certificate
155.Fa x
156to
157.Fa pkey .
158The key
159.Fa pkey
160should be freed up after use.
161.Pp
162.Fn X509_REQ_get_pubkey ,
163.Fn X509_REQ_get0_pubkey ,
164and
165.Fn X509_REQ_set_pubkey
166are similar but operate on certificate request
167.Fa req .
168.Pp
169The first time a public key is decoded, the
170.Vt EVP_PKEY
171structure is cached in the certificate or certificate request itself.
172Subsequent calls return the cached structure with its reference count
173incremented to improve performance.
174.Pp
175.Fn X509_extract_key
176and
177.Fn X509_REQ_extract_key
178are deprecated aliases for
179.Fn X509_get_pubkey
180and
181.Fn X509_REQ_get_pubkey ,
182respectively, implemented as macros.
183.Sh RETURN VALUES
184.Fn X509_get_pubkey ,
185.Fn X509_get0_pubkey ,
186.Fn X509_get_X509_PUBKEY ,
187.Fn X509_get0_pubkey_bitstr ,
188.Fn X509_REQ_get_pubkey ,
189.Fn X509_REQ_get0_pubkey ,
190.Fn X509_extract_key ,
191and
192.Fn X509_REQ_extract_key
193return a public key or
194.Dv NULL
195if an error occurred.
196.Pp
197.Fn X509_set_pubkey
198and
199.Fn X509_REQ_set_pubkey
200return 1 for success or 0 for failure.
201.Pp
202In some cases of failure of
203.Fn X509_get0_pubkey ,
204.Fn X509_set_pubkey ,
205.Fn X509_REQ_get_pubkey ,
206.Fn X509_REQ_get0_pubkey ,
207and
208.Fn X509_REQ_set_pubkey ,
209the reason can be determined with
210.Xr ERR_get_error 3 .
211.Sh ERRORS
212.Fn X509_get_pubkey ,
213.Fn X509_get0_pubkey ,
214.Fn X509_REQ_get_pubkey ,
215.Fn X509_extract_key ,
216and
217.Fn X509_REQ_extract_key
218provide diagnostics as documented for
219.Xr X509_PUBKEY_get 3 .
220If
221.Fa x
222or
223.Fa req
224is
225.Dv NULL
226or contains no certificate information,
227they fail without pushing an error onto the stack.
228.Pp
229.Fn X509_get_X509_PUBKEY
230provides no diagnostics and crashes by accessing a
231.Dv NULL
232pointer if
233.Fa x
234is
235.Dv NULL
236or contains no certificate information,
237.Pp
238.Fn X509_get0_pubkey_bitstr
239provides no diagnostics
240and fails without pushing an error onto the stack if
241.Fa x
242is
243.Dv NULL ,
244but it crashes by accessing a
245.Dv NULL
246pointer if
247.Fa x
248contains no certificate information.
249.Sh SEE ALSO
250.Xr d2i_X509 3 ,
251.Xr X509_CRL_get0_by_serial 3 ,
252.Xr X509_NAME_add_entry_by_txt 3 ,
253.Xr X509_NAME_ENTRY_get_object 3 ,
254.Xr X509_NAME_get_index_by_NID 3 ,
255.Xr X509_NAME_print_ex 3 ,
256.Xr X509_new 3 ,
257.Xr X509_PUBKEY_new 3 ,
258.Xr X509_REQ_new 3 ,
259.Xr X509_sign 3 ,
260.Xr X509_verify_cert 3 ,
261.Xr X509V3_get_d2i 3
262.Sh STANDARDS
263RFC 5280, Internet X.509 Public Key Infrastructure Certificate
264and Certificate Revocation List (CRL) Profile,
265section 4.1 Basic Certificate Fields
266.Pp
267RFC 2986: PKCS #10: Certification Request Syntax Specification,
268section 4.1 CertificationRequestInfo
269.Sh HISTORY
270.Fn X509_extract_key
271and
272.Fn X509_REQ_extract_key
273first appeared in SSLeay 0.5.1 but returned a pointer to an
274.Vt RSA
275object before SSLeay 0.6.0.
276.Fn X509_get_pubkey ,
277.Fn X509_set_pubkey ,
278.Fn X509_REQ_get_pubkey ,
279and
280.Fn X509_REQ_set_pubkey
281first appeared in SSLeay 0.6.5.
282.Fn X509_get_X509_PUBKEY
283first appeared in SSLeay 0.8.0.
284These functions have been available since
285.Ox 2.4 .
286.Pp
287.Fn X509_get0_pubkey_bitstr
288first appeared in OpenSSL 0.9.7 and has been available since
289.Ox 3.4 .
290.Pp
291.Fn X509_get0_pubkey
292first appeared in OpenSSL 1.1.0 and has been available since
293.Ox 6.3 .
294.Fn X509_REQ_get0_pubkey
295first appeared in OpenSSL 1.1.0 and has been available since
296.Ox 7.1 .
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