1=pod 2 3=head1 NAME 4 5X509_sign, X509_sign_ctx, 6X509_REQ_sign, X509_REQ_sign_ctx, 7X509_CRL_sign, X509_CRL_sign_ctx - 8sign certificate, certificate request, or CRL signature 9 10=head1 SYNOPSIS 11 12 #include <openssl/x509.h> 13 14 int X509_sign(X509 *x, EVP_PKEY *pkey, const EVP_MD *md); 15 int X509_sign_ctx(X509 *x, EVP_MD_CTX *ctx); 16 17 int X509_REQ_sign(X509_REQ *x, EVP_PKEY *pkey, const EVP_MD *md); 18 int X509_REQ_sign_ctx(X509_REQ *x, EVP_MD_CTX *ctx); 19 20 int X509_CRL_sign(X509_CRL *x, EVP_PKEY *pkey, const EVP_MD *md); 21 int X509_CRL_sign_ctx(X509_CRL *x, EVP_MD_CTX *ctx); 22 23=head1 DESCRIPTION 24 25X509_sign() signs certificate I<x> using private key I<pkey> and message 26digest I<md> and sets the signature in I<x>. X509_sign_ctx() also signs 27certificate I<x> but uses the parameters contained in digest context I<ctx>. 28 29X509_REQ_sign(), X509_REQ_sign_ctx(), 30X509_CRL_sign(), and X509_CRL_sign_ctx() 31sign certificate requests and CRLs, respectively. 32 33=head1 NOTES 34 35X509_sign_ctx() is used where the default parameters for the corresponding 36public key and digest are not suitable. It can be used to sign keys using 37RSA-PSS for example. 38 39For efficiency reasons and to work around ASN.1 encoding issues the encoding 40of the signed portion of a certificate, certificate request and CRL is cached 41internally. If the signed portion of the structure is modified the encoding 42is not always updated meaning a stale version is sometimes used. This is not 43normally a problem because modifying the signed portion will invalidate the 44signature and signing will always update the encoding. 45 46=head1 RETURN VALUES 47 48All functions return the size of the signature 49in bytes for success and zero for failure. 50 51=head1 SEE ALSO 52 53L<ERR_get_error(3)>, 54L<X509_NAME_add_entry_by_txt(3)>, 55L<X509_new(3)>, 56L<X509_verify_cert(3)>, 57L<X509_verify(3)>, 58L<X509_REQ_verify_ex(3)>, L<X509_REQ_verify(3)>, 59L<X509_CRL_verify(3)> 60 61=head1 HISTORY 62 63The X509_sign(), X509_REQ_sign() and X509_CRL_sign() functions are 64available in all versions of OpenSSL. 65 66The X509_sign_ctx(), X509_REQ_sign_ctx() 67and X509_CRL_sign_ctx() functions were added in OpenSSL 1.0.1. 68 69=head1 COPYRIGHT 70 71Copyright 2015-2020 The OpenSSL Project Authors. All Rights Reserved. 72 73Licensed under the Apache License 2.0 (the "License"). You may not use 74this file except in compliance with the License. You can obtain a copy 75in the file LICENSE in the source distribution or at 76L<https://www.openssl.org/source/license.html>. 77 78=cut 79