.\"	$OpenBSD: RSA_sign_ASN1_OCTET_STRING.3,v 1.7 2019/06/10 14:58:48 schwarze Exp $
.\"	OpenSSL b97fdb57 Nov 11 09:33:09 2016 +0100
.\"
.\" This file was written by Ulf Moeller <ulf@openssl.org>.
.\" Copyright (c) 2000 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: June 10 2019 $
.Dt RSA_SIGN_ASN1_OCTET_STRING 3
.Os
.Sh NAME
.Nm RSA_sign_ASN1_OCTET_STRING ,
.Nm RSA_verify_ASN1_OCTET_STRING
.Nd RSA signatures
.Sh SYNOPSIS
.In openssl/rsa.h
.Ft int
.Fo RSA_sign_ASN1_OCTET_STRING
.Fa "int dummy"
.Fa "unsigned char *m"
.Fa "unsigned int m_len"
.Fa "unsigned char *sigret"
.Fa "unsigned int *siglen"
.Fa "RSA *rsa"
.Fc
.Ft int
.Fo RSA_verify_ASN1_OCTET_STRING
.Fa "int dummy"
.Fa "unsigned char *m"
.Fa "unsigned int m_len"
.Fa "unsigned char *sigbuf"
.Fa "unsigned int siglen"
.Fa "RSA *rsa"
.Fc
.Sh DESCRIPTION
.Fn RSA_sign_ASN1_OCTET_STRING
signs the octet string
.Fa m
of size
.Fa m_len
using the private key
.Fa rsa
represented in DER using PKCS #1 padding.
It stores the signature in
.Fa sigret
and the signature size in
.Fa siglen .
.Fa sigret
must point to
.Fn RSA_size rsa
bytes of memory.
.Pp
.Fa dummy
is ignored.
.Pp
.Fn RSA_verify_ASN1_OCTET_STRING
verifies that the signature
.Fa sigbuf
of size
.Fa siglen
is the DER representation of a given octet string
.Fa m
of size
.Fa m_len .
.Fa dummy
is ignored.
.Fa rsa
is the signer's public key.
.Sh RETURN VALUES
.Fn RSA_sign_ASN1_OCTET_STRING
returns 1 on success or 0 otherwise.
.Fn RSA_verify_ASN1_OCTET_STRING
returns 1 on successful verification or 0 otherwise.
.Pp
The error codes can be obtained by
.Xr ERR_get_error 3 .
.Sh SEE ALSO
.Xr RSA_new 3 ,
.Xr RSA_sign 3 ,
.Xr RSA_verify 3
.Sh HISTORY
.Fn RSA_sign_ASN1_OCTET_STRING
and
.Fn RSA_verify_ASN1_OCTET_STRING
first appeared in SSLeay 0.8.0 and have been available since
.Ox 2.4 .
.Sh BUGS
These functions serve no recognizable purpose.