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One more reason not to use DSA keys: 

The DSA algorithm seems to require a digest value which is 20 bytes
long, which kind of implies SHA-1.

If we have a DSA signature, use SHA-1 as a hash algorithm, for backwards
compatibility. RSA signatures continue to use SHA256 by default, although
this can be given as an argument, if desired.

This fixes DSA signatures with netpgp:

% netpgp --sign --userid d4a643c5 a
pub 1024/DSA 8222c3ecd4a643c5 2010-05-19 [EXPIRES 2013-05-18]
Key fingerprint: 3e4a 5df4 033b 2333 219b 1afd 8222 c3ec d4a6 43c5
uid              Alistair Crooks (DSA TEST KEY - DO NOT USE) <agc@netbsd.org>
sub 1024/DSA 8222c3ecd4a643c5 2010-05-19 [EXPIRES 2013-05-18]
netpgp passphrase:
% netpgp --verify a.gpg
Good signature for a.gpg made Tue May 18 05:41:25 2010
using DSA key 8222c3ecd4a643c5
pub 1024/DSA 8222c3ecd4a643c5 2010-05-19 [EXPIRES 2013-05-18]
Key fingerprint: 3e4a 5df4 033b 2333 219b 1afd 8222 c3ec d4a6 43c5
uid              Alistair Crooks (DSA TEST KEY - DO NOT USE) <agc@netbsd.org>
sub 1024/DSA 8222c3ecd4a643c5 2010-05-19 [EXPIRES 2013-05-18]
%
This commit is contained in:
agc 2010-05-19 02:50:16 +00:00
parent 69d3a7e4fd
commit 0eeb5498cc
1 changed files with 9 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
crypto/external/bsd/netpgp/dist/src/lib/netpgp.c vendored
View File

@ -34,7 +34,7 @@
#if defined(__NetBSD__)
__COPYRIGHT("@(#) Copyright (c) 2009 The NetBSD Foundation, Inc. All rights reserved.");
__RCSID("$NetBSD: netpgp.c,v 1.50 2010/05/16 06:48:52 agc Exp $");
__RCSID("$NetBSD: netpgp.c,v 1.51 2010/05/19 02:50:16 agc Exp $");
#endif
#include <sys/types.h>
@ -886,7 +886,7 @@ netpgp_sign_file(netpgp_t *netpgp,
__ops_seckey_t *seckey;
const unsigned overwrite = 1;
__ops_io_t *io;
char *hashalg;
const char *hashalg;
int ret;
io = netpgp->io;
@ -934,6 +934,9 @@ netpgp_sign_file(netpgp_t *netpgp,
} while (seckey == NULL);
/* sign file */
hashalg = netpgp_getvar(netpgp, "hash");
if (seckey->pubkey.alg == OPS_PKA_DSA) {
hashalg = "sha1";
}
if (detached) {
ret = __ops_sign_detached(io, f, out, seckey, hashalg,
get_birthtime(netpgp_getvar(netpgp, "birthtime")),
@ -1017,7 +1020,7 @@ netpgp_sign_memory(netpgp_t *netpgp,
__ops_seckey_t *seckey;
__ops_memory_t *signedmem;
__ops_io_t *io;
char *hashalg;
const char *hashalg;
int ret;
io = netpgp->io;
@ -1059,6 +1062,9 @@ netpgp_sign_memory(netpgp_t *netpgp,
/* sign file */
(void) memset(out, 0x0, outsize);
hashalg = netpgp_getvar(netpgp, "hash");
if (seckey->pubkey.alg == OPS_PKA_DSA) {
hashalg = "sha1";
}
signedmem = __ops_sign_buf(io, mem, size, seckey,
get_birthtime(netpgp_getvar(netpgp, "birthtime")),
get_duration(netpgp_getvar(netpgp, "duration")),