.\" Copyright (c) 2001-2002 Packet Design, LLC. .\" All rights reserved. .\" .\" Subject to the following obligations and disclaimer of warranty, .\" use and redistribution of this software, in source or object code .\" forms, with or without modifications are expressly permitted by .\" Packet Design; provided, however, that: .\" .\" (i) Any and all reproductions of the source or object code .\" must include the copyright notice above and the following .\" disclaimer of warranties; and .\" (ii) No rights are granted, in any manner or form, to use .\" Packet Design trademarks, including the mark "PACKET DESIGN" .\" on advertising, endorsements, or otherwise except as such .\" appears in the above copyright notice or in the software. .\" .\" THIS SOFTWARE IS BEING PROVIDED BY PACKET DESIGN "AS IS", AND .\" TO THE MAXIMUM EXTENT PERMITTED BY LAW, PACKET DESIGN MAKES NO .\" REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING .\" THIS SOFTWARE, INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED .\" WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, .\" OR NON-INFRINGEMENT. PACKET DESIGN DOES NOT WARRANT, GUARANTEE, .\" OR MAKE ANY REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS .\" OF THE USE OF THIS SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, .\" RELIABILITY OR OTHERWISE. IN NO EVENT SHALL PACKET DESIGN BE .\" LIABLE FOR ANY DAMAGES RESULTING FROM OR ARISING OUT OF ANY USE .\" OF THIS SOFTWARE, INCLUDING WITHOUT LIMITATION, ANY DIRECT, .\" INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, PUNITIVE, OR CONSEQUENTIAL .\" DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, LOSS OF .\" USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER 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 PACKET DESIGN IS ADVISED OF .\" THE POSSIBILITY OF SUCH DAMAGE. .\" .\" Author: Archie Cobbs .\" .\" $Id: rsa_util_sign.3,v 1.1.1.1 2012/02/21 23:25:53 misho Exp $ .\" .Dd April 22, 2002 .Dt RSA_UTIL_SIGN 3 .Os .Sh NAME .Nm rsa_util_sign , .Nm rsa_util_verify , .Nm rsa_util_verify_priv .Nd RSA digital signature routines .Sh LIBRARY PDEL Library (libpdel, \-lpdel) .Sh SYNOPSIS .In sys/types.h .In pdel/util/rsa_util.h .Ft int .Fn rsa_util_sign "const char *privkeyfile" "const u_char *md5" "u_char *sig" "size_t siglen" .Ft int .Fn rsa_util_verify "const char *pubkeyfile" "const u_char *md5" "const u_char *sig" "size_t siglen" .Ft int .Fn rsa_util_verify_priv "const char *privkeyfile" "const u_char *md5" "const u_char *sig" "size_t siglen" .Sh DESCRIPTION These routines are convenience wrappers around the OpenSSL crypto library for creating and verifying RSA digital signatures. They use the .Xr md5 3 hash of the original document for the actual signing operation. .Pp .Fn rsa_util_sign creates a digital signature. .Fa privkeyfile is the pathname of the private key file (which must be unencrypted). .Fa md5 is the hash of the document to be signed. .Fa sig points to a buffer of at least 128 bytes. .Fa siglen is the size of the buffer. .Fn rsa_util_sign returns the length of the resulting signature, or -1 (with .Va errno set) if there was an error. .Pp .Fn rsa_util_verify verifies a digital signature. .Fa pubkeyfile is the pathname of the public key file. .Fa md5 is the hash of the document to be signed. .Fa sig points to the signature to verify, having length .Fa siglen . .Fn rsa_util_verify returns 1 if the signature is valid, otherwise 0. .Pp .Fn rsa_util_verify_priv functions exactly like .Fn rsa_util_verify except that the private key file (which also contains the public key) is passed as the first argument. .Sh EXAMPLES To create a new RSA private key: .Bd -literal -offset 3n openssl genrsa -rand /dev/random -out mykey.key 1024 .Ed To view the contents of an RSA private key file: .Bd -literal -offset 3n openssl rsa -in mykey.key -text -noout .Ed To extract the RSA public key from an RSA private key file: .Bd -literal -offset 3n openssl rsa -in mykey.key -pubout -out mykey.pub .Ed To view the contents of an RSA public key file: .Bd -literal -offset 3n openssl rsa -pubin -in mykey.pub -text -noout .Ed .Sh SEE ALSO .Xr openssl 1 , .Xr md5 3 , .Xr libpdel 3 .Sh HISTORY The PDEL library was developed at Packet Design, LLC. .Dv "http://www.packetdesign.com/" .Sh AUTHORS .An Archie Cobbs Aq archie@freebsd.org