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X509_sign(3)                        OpenSSL                       X509_sign(3)



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

LIBRARY
       libcrypto, -lcrypto

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() 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.

       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(), 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 2015-2020 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>.



3.0.12                            2023-05-07                      X509_sign(3)