.\"	$OpenBSD: X509_SIG_new.3,v 1.4 2018/03/27 17:35:50 schwarze Exp $
.\"
.\" Copyright (c) 2016 Ingo Schwarze <schwarze@openbsd.org>
.\"
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.\" copyright notice and this permission notice appear in all copies.
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.Dd $Mdocdate: March 27 2018 $
.Dt X509_SIG_NEW 3
.Os
.Sh NAME
.Nm X509_SIG_new ,
.Nm X509_SIG_free
.Nd PKCS#7 digest information
.Sh SYNOPSIS
.In openssl/x509.h
.Ft X509_SIG *
.Fn X509_SIG_new void
.Ft void
.Fn X509_SIG_free "X509_SIG *sig"
.Sh DESCRIPTION
.Fn X509_SIG_new
allocates and initializes an empty
.Vt X509_SIG
object, representing an ASN.1
.Vt DigestInfo
structure defined in RFC 2315 section 9.4
and equivalently in RFC 8017 section 9.2.
It can hold a message digest together with information about
the algorithm used.
.Pp
.Fn X509_SIG_free
frees
.Fa sig .
.Sh RETURN VALUES
.Fn X509_SIG_new
returns the new
.Vt X509_SIG
object or
.Dv NULL
if an error occurs.
.Sh SEE ALSO
.Xr d2i_X509_SIG 3 ,
.Xr PEM_read_PKCS8 3 ,
.Xr RSA_sign 3 ,
.Xr X509_new 3
.Sh STANDARDS
RFC 2315: PKCS #7: Cryptographic Message Syntax,
section 9: Signed-data content type
.Pp
RFC 8017: PKCS #1: RSA Cryptography Specifications,
section 9: Encoding Methods for Signatures
.Sh HISTORY
.Fn X509_SIG_new
and
.Fn X509_SIG_free
appeared in SSLeay 0.4 or earlier and have been available since
.Ox 2.4 .