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() 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>.