.\"	$OpenBSD: X509_digest.3,v 1.6 2018/03/27 17:35:50 schwarze Exp $
.\"	OpenSSL X509_digest.pod 3ba4dac6 Mar 23 13:04:52 2017 -0400
.\"
.\" This file was written by Rich Salz <rsalz@openssl.org>
.\" Copyright (c) 2017 The OpenSSL Project.  All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\"
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\"
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in
.\"    the documentation and/or other materials provided with the
.\"    distribution.
.\"
.\" 3. All advertising materials mentioning features or use of this
.\"    software must display the following acknowledgment:
.\"    "This product includes software developed by the OpenSSL Project
.\"    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
.\"
.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
.\"    endorse or promote products derived from this software without
.\"    prior written permission. For written permission, please contact
.\"    openssl-core@openssl.org.
.\"
.\" 5. Products derived from this software may not be called "OpenSSL"
.\"    nor may "OpenSSL" appear in their names without prior written
.\"    permission of the OpenSSL Project.
.\"
.\" 6. Redistributions of any form whatsoever must retain the following
.\"    acknowledgment:
.\"    "This product includes software developed by the OpenSSL Project
.\"    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
.\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
.\" OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd $Mdocdate: March 27 2018 $
.Dt X509_DIGEST 3
.Os
.Sh NAME
.Nm X509_digest ,
.Nm X509_CRL_digest ,
.Nm X509_pubkey_digest ,
.Nm X509_NAME_digest ,
.Nm X509_REQ_digest ,
.Nm PKCS7_ISSUER_AND_SERIAL_digest
.Nd get digests of various objects
.Sh SYNOPSIS
.In openssl/x509.h
.Ft int
.Fo X509_digest
.Fa "const X509 *data"
.Fa "const EVP_MD *type"
.Fa "unsigned char *md"
.Fa "unsigned int *len"
.Fc
.Ft int
.Fo X509_CRL_digest
.Fa "const X509_CRL *data"
.Fa "const EVP_MD *type"
.Fa "unsigned char *md"
.Fa "unsigned int *len"
.Fc
.Ft int
.Fo X509_pubkey_digest
.Fa "const X509 *data"
.Fa "const EVP_MD *type"
.Fa "unsigned char *md"
.Fa "unsigned int *len"
.Fc
.Ft int
.Fo X509_REQ_digest
.Fa "const X509_REQ *data"
.Fa "const EVP_MD *type"
.Fa "unsigned char *md"
.Fa "unsigned int *len"
.Fc
.Ft int
.Fo X509_NAME_digest
.Fa "const X509_NAME *data"
.Fa "const EVP_MD *type"
.Fa "unsigned char *md"
.Fa "unsigned int *len"
.Fc
.In openssl/pkcs7.h
.Ft int
.Fo PKCS7_ISSUER_AND_SERIAL_digest
.Fa "PKCS7_ISSUER_AND_SERIAL *data"
.Fa "const EVP_MD *type"
.Fa "unsigned char *md"
.Fa "unsigned int *len"
.Fc
.Sh DESCRIPTION
.Fn X509_pubkey_digest
returns a digest of the DER representation of the public key contained in
.Fa data .
All other functions described here return a digest of the DER
representation of their entire
.Fa data
object.
.Pp
The
.Fa type
parameter specifies the digest to be used, such as
.Xr EVP_sha1 3 .
.Fa md
is a pointer to the buffer where the digest will be copied and is
assumed to be large enough; a size of at least
.Dv EVP_MAX_MD_SIZE
bytes is suggested.
The
.Fa len
parameter, if not
.Dv NULL ,
points to a place where the digest size will be stored.
.Sh RETURN VALUES
These functions return 1 for success or 0 for failure.
.Sh SEE ALSO
.Xr EVP_get_digestbyname 3
.Sh HISTORY
.Fn X509_digest ,
.Fn X509_NAME_digest ,
and
.Fn PKCS7_ISSUER_AND_SERIAL_digest
first appeared in SSLeay 0.6.5 and have been available since
.Ox 2.4 .
.Pp
.Fn X509_CRL_digest
and
.Fn X509_REQ_digest
first appeared in OpenSSL 0.9.6 and have been available since
.Ox 2.9 .
.Pp
.Fn X509_pubkey_digest
first appeared in OpenSSL 0.9.7 and has been available since
.Ox 3.2 .