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129 .\" ========================================================================
131 .IX Title "X509_SIGN 3"
132 .TH X509_SIGN 3 "2018-09-11" "1.1.1" "OpenSSL"
133 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
134 .\" way too many mistakes in technical documents.
138 X509_sign, X509_sign_ctx, X509_verify, X509_REQ_sign, X509_REQ_sign_ctx, X509_REQ_verify, X509_CRL_sign, X509_CRL_sign_ctx, X509_CRL_verify \- sign or verify certificate, certificate request or CRL signature
140 .IX Header "SYNOPSIS"
142 \& #include <openssl/x509.h>
144 \& int X509_sign(X509 *x, EVP_PKEY *pkey, const EVP_MD *md);
145 \& int X509_sign_ctx(X509 *x, EVP_MD_CTX *ctx);
146 \& int X509_verify(X509 *a, EVP_PKEY *r);
148 \& int X509_REQ_sign(X509_REQ *x, EVP_PKEY *pkey, const EVP_MD *md);
149 \& int X509_REQ_sign_ctx(X509_REQ *x, EVP_MD_CTX *ctx);
150 \& int X509_REQ_verify(X509_REQ *a, EVP_PKEY *r);
152 \& int X509_CRL_sign(X509_CRL *x, EVP_PKEY *pkey, const EVP_MD *md);
153 \& int X509_CRL_sign_ctx(X509_CRL *x, EVP_MD_CTX *ctx);
154 \& int X509_CRL_verify(X509_CRL *a, EVP_PKEY *r);
157 .IX Header "DESCRIPTION"
158 \&\fIX509_sign()\fR signs certificate \fBx\fR using private key \fBpkey\fR and message
159 digest \fBmd\fR and sets the signature in \fBx\fR. \fIX509_sign_ctx()\fR also signs
160 certificate \fBx\fR but uses the parameters contained in digest context \fBctx\fR.
162 \&\fIX509_verify()\fR verifies the signature of certificate \fBx\fR using public key
163 \&\fBpkey\fR. Only the signature is checked: no other checks (such as certificate
164 chain validity) are performed.
166 \&\fIX509_REQ_sign()\fR, \fIX509_REQ_sign_ctx()\fR, \fIX509_REQ_verify()\fR,
167 \&\fIX509_CRL_sign()\fR, \fIX509_CRL_sign_ctx()\fR and \fIX509_CRL_verify()\fR sign and verify
168 certificate requests and CRLs respectively.
171 \&\fIX509_sign_ctx()\fR is used where the default parameters for the corresponding
172 public key and digest are not suitable. It can be used to sign keys using
175 For efficiency reasons and to work around \s-1ASN.1\s0 encoding issues the encoding
176 of the signed portion of a certificate, certificate request and \s-1CRL\s0 is cached
177 internally. If the signed portion of the structure is modified the encoding
178 is not always updated meaning a stale version is sometimes used. This is not
179 normally a problem because modifying the signed portion will invalidate the
180 signature and signing will always update the encoding.
182 .IX Header "RETURN VALUES"
183 \&\fIX509_sign()\fR, \fIX509_sign_ctx()\fR, \fIX509_REQ_sign()\fR, \fIX509_REQ_sign_ctx()\fR,
184 \&\fIX509_CRL_sign()\fR and \fIX509_CRL_sign_ctx()\fR return the size of the signature
185 in bytes for success and zero for failure.
187 \&\fIX509_verify()\fR, \fIX509_REQ_verify()\fR and \fIX509_CRL_verify()\fR return 1 if the
188 signature is valid and 0 if the signature check fails. If the signature
189 could not be checked at all because it was invalid or some other error
190 occurred then \-1 is returned.
192 .IX Header "SEE ALSO"
193 \&\fId2i_X509\fR\|(3),
194 \&\fIERR_get_error\fR\|(3),
195 \&\fIX509_CRL_get0_by_serial\fR\|(3),
196 \&\fIX509_get0_signature\fR\|(3),
197 \&\fIX509_get_ext_d2i\fR\|(3),
198 \&\fIX509_get_extension_flags\fR\|(3),
199 \&\fIX509_get_pubkey\fR\|(3),
200 \&\fIX509_get_subject_name\fR\|(3),
201 \&\fIX509_get_version\fR\|(3),
202 \&\fIX509_NAME_add_entry_by_txt\fR\|(3),
203 \&\fIX509_NAME_ENTRY_get_object\fR\|(3),
204 \&\fIX509_NAME_get_index_by_NID\fR\|(3),
205 \&\fIX509_NAME_print_ex\fR\|(3),
206 \&\fIX509_new\fR\|(3),
207 \&\fIX509V3_get_d2i\fR\|(3),
208 \&\fIX509_verify_cert\fR\|(3)
211 \&\fIX509_sign()\fR, \fIX509_REQ_sign()\fR and \fIX509_CRL_sign()\fR are available in all
214 \&\fIX509_sign_ctx()\fR, \fIX509_REQ_sign_ctx()\fR and \fIX509_CRL_sign_ctx()\fR were first added
217 .IX Header "COPYRIGHT"
218 Copyright 2015\-2016 The OpenSSL Project Authors. All Rights Reserved.
220 Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
221 this file except in compliance with the License. You can obtain a copy
222 in the file \s-1LICENSE\s0 in the source distribution or at
223 <https://www.openssl.org/source/license.html>.