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.\" ========================================================================
.\"
.IX Title "X509_SIGN 3"
.TH X509_SIGN 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
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
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #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_verify(X509 *a, EVP_PKEY *r);
\&
\& 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_REQ_verify(X509_REQ *a, EVP_PKEY *r);
\&
\& 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);
\& int X509_CRL_verify(X509_CRL *a, EVP_PKEY *r);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBX509_sign()\fR signs certificate \fBx\fR using private key \fBpkey\fR and message
digest \fBmd\fR and sets the signature in \fBx\fR. \fBX509_sign_ctx()\fR also signs
certificate \fBx\fR but uses the parameters contained in digest context \fBctx\fR.
.PP
\&\fBX509_verify()\fR verifies the signature of certificate \fBx\fR using public key
\&\fBpkey\fR. Only the signature is checked: no other checks (such as certificate
chain validity) are performed.
.PP
\&\fBX509_REQ_sign()\fR, \fBX509_REQ_sign_ctx()\fR, \fBX509_REQ_verify()\fR,
\&\fBX509_CRL_sign()\fR, \fBX509_CRL_sign_ctx()\fR and \fBX509_CRL_verify()\fR sign and verify
certificate requests and CRLs respectively.
.SH "NOTES"
.IX Header "NOTES"
\&\fBX509_sign_ctx()\fR 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.
.PP
For efficiency reasons and to work around \s-1ASN.1\s0 encoding issues the encoding
of the signed portion of a certificate, certificate request and \s-1CRL\s0 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.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBX509_sign()\fR, \fBX509_sign_ctx()\fR, \fBX509_REQ_sign()\fR, \fBX509_REQ_sign_ctx()\fR,
\&\fBX509_CRL_sign()\fR and \fBX509_CRL_sign_ctx()\fR return the size of the signature
in bytes for success and zero for failure.
.PP
\&\fBX509_verify()\fR, \fBX509_REQ_verify()\fR and \fBX509_CRL_verify()\fR return 1 if the
signature is valid and 0 if the signature check fails. If the signature
could not be checked at all because it was invalid or some other error
occurred then \-1 is returned.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBd2i_X509\fR\|(3),
\&\fBERR_get_error\fR\|(3),
\&\fBX509_CRL_get0_by_serial\fR\|(3),
\&\fBX509_get0_signature\fR\|(3),
\&\fBX509_get_ext_d2i\fR\|(3),
\&\fBX509_get_extension_flags\fR\|(3),
\&\fBX509_get_pubkey\fR\|(3),
\&\fBX509_get_subject_name\fR\|(3),
\&\fBX509_get_version\fR\|(3),
\&\fBX509_NAME_add_entry_by_txt\fR\|(3),
\&\fBX509_NAME_ENTRY_get_object\fR\|(3),
\&\fBX509_NAME_get_index_by_NID\fR\|(3),
\&\fBX509_NAME_print_ex\fR\|(3),
\&\fBX509_new\fR\|(3),
\&\fBX509V3_get_d2i\fR\|(3),
\&\fBX509_verify_cert\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
The \fBX509_sign()\fR, \fBX509_REQ_sign()\fR and \fBX509_CRL_sign()\fR functions are
available in all versions of OpenSSL.
.PP
The \fBX509_sign_ctx()\fR, \fBX509_REQ_sign_ctx()\fR
and \fBX509_CRL_sign_ctx()\fR functions were added OpenSSL 1.0.1.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2015\-2016 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.

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Regist : 09-12-2024	Expired : 01-12-2027