X509_SIGN(3ossl) OpenSSL X509_SIGN(3ossl)
NAME
X509_sign, X509_sign_ctx, X509_REQ_sign, X509_REQ_sign_ctx,
X509_CRL_sign, X509_CRL_sign_ctx - sign certificate, certificate
request, or CRL signature
SYNOPSIS
#include <openssl/x509.h>
int X509_sign(X509 *x, EVP_PKEY *pkey, const EVP_MD *md);
int X509_sign_ctx(X509 *x, EVP_MD_CTX *ctx);
int X509_REQ_sign(X509_REQ *x, EVP_PKEY *pkey, const EVP_MD *md);
int X509_REQ_sign_ctx(X509_REQ *x, EVP_MD_CTX *ctx);
int X509_CRL_sign(X509_CRL *x, EVP_PKEY *pkey, const EVP_MD *md);
int X509_CRL_sign_ctx(X509_CRL *x, EVP_MD_CTX *ctx);
DESCRIPTION
X509_sign(3) signs certificate x using private key pkey and message
digest md and sets the signature in x. X509_sign_ctx() also signs
certificate x but uses the parameters contained in digest context ctx.
If the certificate information includes X.509 extensions, these two
functions make sure that the certificate bears X.509 version 3.
X509_REQ_sign(), X509_REQ_sign_ctx(), X509_CRL_sign(), and
X509_CRL_sign_ctx() sign certificate requests and CRLs, respectively.
NOTES
X509_sign_ctx() is used where the default parameters for the
corresponding public key and digest are not suitable. It can be used to
sign keys using RSA-PSS for example.
For efficiency reasons and to work around ASN.1 encoding issues the
encoding of the signed portion of a certificate, certificate request
and CRL is cached internally. If the signed portion of the structure is
modified the encoding is not always updated meaning a stale version is
sometimes used. This is not normally a problem because modifying the
signed portion will invalidate the signature and signing will always
update the encoding.
RETURN VALUES
All functions return the size of the signature in bytes for success and
zero for failure.
SEE ALSO
ERR_get_error(3), X509_NAME_add_entry_by_txt(3), X509_new(3),
X509_verify_cert(3), X509_verify(3), X509_REQ_verify_ex(3),
X509_REQ_verify(3), X509_CRL_verify(3)
HISTORY
The X509_sign(3), X509_REQ_sign() and X509_CRL_sign() functions are
available in all versions of OpenSSL.
The X509_sign_ctx(), X509_REQ_sign_ctx() and X509_CRL_sign_ctx()
functions were added in OpenSSL 1.0.1.
COPYRIGHT
Copyright 2015-2023 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the Apache License 2.0 (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file LICENSE in the source distribution or at
<https://www.openssl.org/source/license.html>.
3.3.2 2024-09-04 X509_SIGN(3ossl)
openssl 3.3.2 - Generated Sat Sep 28 09:23:42 CDT 2024