Commit Graph

39 Commits

Author SHA1 Message Date
djm@openbsd.org
7bdb2eeb1d upstream commit
remove hmac-ripemd160; ok dtucker

Upstream-ID: 896e737ea0bad6e23327d1c127e02d5e9e9c654d
2017-05-10 11:41:21 +10:00
Darren Tucker
a9ff3950b8 Move OPENSSL_NO_RIPEMD160 to compat.
Move OPENSSL_NO_RIPEMD160 to compat and add ifdefs to mac.c around the
ripemd160 MACs.
2016-10-28 14:26:58 +11:00
djm@openbsd.org
6d31193d0b upstream commit
Improve crypto ordering for Encrypt-then-MAC (EtM) mode
MAC algorithms.

Previously we were computing the MAC, decrypting the packet and then
checking the MAC. This gave rise to the possibility of creating a
side-channel oracle in the decryption step, though no such oracle has
been identified.

This adds a mac_check() function that computes and checks the MAC in
one pass, and uses it to advance MAC checking for EtM algorithms to
before payload decryption.

Reported by Jean Paul Degabriele, Kenny Paterson, Torben Hansen and
Martin Albrecht. feedback and ok markus@

Upstream-ID: 1999bb67cab47dda5b10b80d8155fe83d4a1867b
2016-07-08 13:50:03 +10:00
naddy@openbsd.org
ddef9995a1 upstream commit
handle UMAC128 initialization like UMAC; ok djm@ markus@
2015-01-16 18:21:32 +11:00
markus@openbsd.org
128343bcdb upstream commit
adapt mac.c to ssherr.h return codes (de-fatal) and
 simplify dependencies ok djm@
2015-01-14 20:43:11 +11:00
Damien Miller
294c58a007 - naddy@cvs.openbsd.org 2014/04/30 19:07:48
[mac.c myproposal.h umac.c]
     UMAC can use our local fallback implementation of AES when OpenSSL isn't
     available.  Glue code straight from Ted Krovetz's original umac.c.
     ok markus@
2014-05-15 14:35:03 +10:00
Damien Miller
1f0311c7c7 - markus@cvs.openbsd.org 2014/04/29 18:01:49
[auth.c authfd.c authfile.c bufaux.c cipher.c cipher.h hostfile.c]
     [kex.c key.c mac.c monitor.c monitor_wrap.c myproposal.h packet.c]
     [roaming_client.c ssh-agent.c ssh-keygen.c ssh-keyscan.c ssh-keysign.c]
     [ssh-pkcs11.h ssh.c sshconnect.c sshconnect2.c sshd.c]
     make compiling against OpenSSL optional (make OPENSSL=no);
     reduces algorithms to curve25519, aes-ctr, chacha, ed25519;
     allows us to explore further options; with and ok djm
2014-05-15 14:24:09 +10:00
Damien Miller
d3cf67e111 - djm@cvs.openbsd.org 2014/02/07 06:55:54
[cipher.c mac.c]
     remove some logging that makes ssh debugging output very verbose;
     ok markus
2014-02-24 15:55:36 +11:00
Damien Miller
4e8d937af7 - markus@cvs.openbsd.org 2014/01/27 18:58:14
[Makefile.in digest.c digest.h hostfile.c kex.h mac.c hmac.c hmac.h]
     replace openssl HMAC with an implementation based on our ssh_digest_*
     ok and feedback djm@
2014-02-04 11:02:42 +11:00
Damien Miller
3e49853650 - tedu@cvs.openbsd.org 2014/01/04 17:50:55
[mac.c monitor_mm.c monitor_mm.h xmalloc.c]
     use standard types and formats for size_t like variables. ok dtucker
2014-01-10 10:37:05 +11:00
Damien Miller
690d989008 - dtucker@cvs.openbsd.org 2013/11/07 11:58:27
[cipher.c cipher.h kex.c kex.h mac.c mac.h servconf.c ssh.c]
     Output the effective values of Ciphers, MACs and KexAlgorithms when
     the default has not been overridden.  ok markus@
2013-11-08 12:16:49 +11:00
Darren Tucker
4ac66af091 - dtucker@cvs.openbsd.org 2013/06/03 00:03:18
[mac.c]
     force the MAC output to be 64-bit aligned so umac won't see unaligned
     accesses on strict-alignment architectures.  bz#2101, patch from
     tomas.kuthan at oracle.com, ok djm@
2013-06-06 08:12:37 +10:00
Darren Tucker
a627d42e51 - djm@cvs.openbsd.org 2013/05/17 00:13:13
[xmalloc.h cipher.c sftp-glob.c ssh-keyscan.c ssh.c sftp-common.c
     ssh-ecdsa.c auth2-chall.c compat.c readconf.c kexgexs.c monitor.c
     gss-genr.c cipher-3des1.c kex.c monitor_wrap.c ssh-pkcs11-client.c
     auth-options.c rsa.c auth2-pubkey.c sftp.c hostfile.c auth2.c
     servconf.c auth.c authfile.c xmalloc.c uuencode.c sftp-client.c
     auth2-gss.c sftp-server.c bufaux.c mac.c session.c jpake.c kexgexc.c
     sshconnect.c auth-chall.c auth2-passwd.c sshconnect1.c buffer.c
     kexecdhs.c kexdhs.c ssh-rsa.c auth1.c ssh-pkcs11.c auth2-kbdint.c
     kexdhc.c sshd.c umac.c ssh-dss.c auth2-jpake.c bufbn.c clientloop.c
     monitor_mm.c scp.c roaming_client.c serverloop.c key.c auth-rsa.c
     ssh-pkcs11-helper.c ssh-keysign.c ssh-keygen.c match.c channels.c
     sshconnect2.c addrmatch.c mux.c canohost.c kexecdhc.c schnorr.c
     ssh-add.c misc.c auth2-hostbased.c ssh-agent.c bufec.c groupaccess.c
     dns.c packet.c readpass.c authfd.c moduli.c]
     bye, bye xfree(); ok markus@
2013-06-02 07:31:17 +10:00
Damien Miller
ea11119eee - djm@cvs.openbsd.org 2013/04/19 01:06:50
[authfile.c cipher.c cipher.h kex.c kex.h kexecdh.c kexecdhc.c kexecdhs.c]
     [key.c key.h mac.c mac.h packet.c ssh.1 ssh.c]
     add the ability to query supported ciphers, MACs, key type and KEX
     algorithms to ssh. Includes some refactoring of KEX and key type handling
     to be table-driven; ok markus@
2013-04-23 19:24:32 +10:00
Damien Miller
37834afe7b - (djm) [mac.c] fix merge botch 2012-12-12 11:00:37 +11:00
Damien Miller
74f13bdf26 - sthen@cvs.openbsd.org 2012/12/11 22:51:45
[mac.c]
     fix typo, s/tem/etm in hmac-ripemd160-tem. ok markus@
2012-12-12 10:46:53 +11:00
Damien Miller
af43a7ac2d - markus@cvs.openbsd.org 2012/12/11 22:31:18
[PROTOCOL authfile.c cipher.c cipher.h kex.h mac.c myproposal.h]
     [packet.c ssh_config.5 sshd_config.5]
     add encrypt-then-mac (EtM) modes to openssh by defining new mac algorithms
     that change the packet format and compute the MAC over the encrypted
     message (including the packet size) instead of the plaintext data;
     these EtM modes are considered more secure and used by default.
     feedback and ok djm@
2012-12-12 10:46:31 +11:00
Darren Tucker
427e409e99 - markus@cvs.openbsd.org 2012/10/04 13:21:50
[myproposal.h ssh_config.5 umac.h sshd_config.5 ssh.1 sshd.8 mac.c]
     add umac128 variant; ok djm@ at n2k12
     (note: further Makefile work is required)
2012-10-05 11:02:39 +10:00
Damien Miller
db4f8e8618 - dtucker@cvs.openbsd.org 2012/06/28 05:07:45
[mac.c myproposal.h ssh_config.5 sshd_config.5]
     Remove hmac-sha2-256-96 and hmac-sha2-512-96 MACs since they were removed
     from draft6 of the spec and will not be in the RFC when published.  Patch
     from mdb at juniper net via bz#2023, ok markus.
2012-06-30 08:34:59 +10:00
Darren Tucker
e9b3ad73ba - (dtucker) [configure.ac mac.c openbsd-compat/openssl-compat.h] Add
null implementation of HMAC_CTX_init for the benefit of old versions
   of OpenSSL that don't have it.
2012-01-17 14:03:34 +11:00
Damien Miller
d0e582c6da - djm@cvs.openbsd.org 2011/12/02 00:43:57
[mac.c]
     fix bz#1934: newer OpenSSL versions will require HMAC_CTX_Init before
     HMAC_init (this change in policy seems insane to me)
     ok dtucker@
2011-12-19 10:51:39 +11:00
Tim Rice
a1226828ad - (tim) [mac.c myproposal.h] Wrap SHA256 and SHA512 in ifdefs for
OpenSSL 0.9.7. ok djm
2011-08-16 17:29:01 -07:00
Damien Miller
20bd4535c0 - djm@cvs.openbsd.org 2011/08/02 01:22:11
[mac.c myproposal.h ssh.1 ssh_config.5 sshd.8 sshd_config.5]
     Add new SHA256 and SHA512 based HMAC modes from
     http://www.ietf.org/id/draft-dbider-sha2-mac-for-ssh-02.txt
     Patch from mdb AT juniper.net; feedback and ok markus@
2011-08-06 06:17:30 +10:00
Darren Tucker
c7e030fd78 - dtucker@cvs.openbsd.org 2008/06/13 00:51:47
[mac.c]
     upcast another size_t to u_long to match format
2008-06-13 10:58:50 +10:00
Damien Miller
e45796f7b4 - pvalchev@cvs.openbsd.org 2007/06/07 19:37:34
[kex.h mac.c mac.h monitor_wrap.c myproposal.h packet.c ssh.1]
     [ssh_config.5 sshd.8 sshd_config.5]
     Add a new MAC algorithm for data integrity, UMAC-64 (not default yet,
     must specify umac-64@openssh.com). Provides about 20% end-to-end speedup
     compared to hmac-md5. Represents a different approach to message
     authentication to that of HMAC that may be beneficial if HMAC based on
     one of its underlying hash algorithms is found to be vulnerable to a
     new attack.  http://www.ietf.org/rfc/rfc4418.txt
     in conjunction with and OK djm@
2007-06-11 14:01:42 +10:00
Darren Tucker
5f3d5be52f - djm@cvs.openbsd.org 2007/06/05 06:52:37
[kex.c monitor_wrap.c packet.c mac.h kex.h mac.c]
     Preserve MAC ctx between packets, saving 2xhash calls per-packet.
     Yields around a 12-16% end-to-end speedup for arcfour256/hmac-md5
     patch from markus@ tested dtucker@ and myself, ok markus@ and me (I'm
     committing at his request)
2007-06-05 18:30:18 +10:00
Damien Miller
ded319cca2 - (djm) [audit-bsm.c audit.c auth-bsdauth.c auth-chall.c auth-pam.c]
[auth-rsa.c auth-shadow.c auth-sia.c auth1.c auth2-chall.c]
   [auth2-gss.c auth2-kbdint.c auth2-none.c authfd.c authfile.c]
   [cipher-3des1.c cipher-aes.c cipher-bf1.c cipher-ctr.c clientloop.c]
   [dh.c dns.c entropy.c gss-serv-krb5.c gss-serv.c hostfile.c kex.c]
   [kexdhc.c kexdhs.c kexgexc.c kexgexs.c key.c loginrec.c mac.c]
   [md5crypt.c monitor.c monitor_wrap.c readconf.c rsa.c]
   [scard-opensc.c scard.c session.c ssh-add.c ssh-agent.c ssh-dss.c]
   [ssh-keygen.c ssh-keysign.c ssh-rsa.c ssh.c sshconnect.c]
   [sshconnect1.c sshconnect2.c sshd.c rc4.diff]
   [openbsd-compat/bsd-cray.c openbsd-compat/port-aix.c]
   [openbsd-compat/port-linux.c openbsd-compat/port-solaris.c]
   [openbsd-compat/port-uw.c]
   Lots of headers for SCO OSR6, mainly adding stdarg.h for log.h;
   compile problems reported by rac AT tenzing.org
2006-09-01 15:38:36 +10:00
Damien Miller
d783435315 - deraadt@cvs.openbsd.org 2006/08/03 03:34:42
[OVERVIEW atomicio.c atomicio.h auth-bsdauth.c auth-chall.c auth-krb5.c]
     [auth-options.c auth-options.h auth-passwd.c auth-rh-rsa.c auth-rhosts.c]
     [auth-rsa.c auth-skey.c auth.c auth.h auth1.c auth2-chall.c auth2-gss.c]
     [auth2-hostbased.c auth2-kbdint.c auth2-none.c auth2-passwd.c ]
     [auth2-pubkey.c auth2.c authfd.c authfd.h authfile.c bufaux.c bufbn.c]
     [buffer.c buffer.h canohost.c channels.c channels.h cipher-3des1.c]
     [cipher-bf1.c cipher-ctr.c cipher.c cleanup.c clientloop.c compat.c]
     [compress.c deattack.c dh.c dispatch.c dns.c dns.h fatal.c groupaccess.c]
     [groupaccess.h gss-genr.c gss-serv-krb5.c gss-serv.c hostfile.c kex.c]
     [kex.h kexdh.c kexdhc.c kexdhs.c kexgex.c kexgexc.c kexgexs.c key.c]
     [key.h log.c log.h mac.c match.c md-sha256.c misc.c misc.h moduli.c]
     [monitor.c monitor_fdpass.c monitor_mm.c monitor_mm.h monitor_wrap.c]
     [monitor_wrap.h msg.c nchan.c packet.c progressmeter.c readconf.c]
     [readconf.h readpass.c rsa.c scard.c scard.h scp.c servconf.c servconf.h]
     [serverloop.c session.c session.h sftp-client.c sftp-common.c]
     [sftp-common.h sftp-glob.c sftp-server.c sftp.c ssh-add.c ssh-agent.c]
     [ssh-dss.c ssh-gss.h ssh-keygen.c ssh-keyscan.c ssh-keysign.c ssh-rsa.c]
     [ssh.c ssh.h sshconnect.c sshconnect.h sshconnect1.c sshconnect2.c]
     [sshd.c sshlogin.c sshlogin.h sshpty.c sshpty.h sshtty.c ttymodes.c]
     [uidswap.c uidswap.h uuencode.c uuencode.h xmalloc.c xmalloc.h]
     [loginrec.c loginrec.h openbsd-compat/port-aix.c openbsd-compat/port-tun.h]
     almost entirely get rid of the culture of ".h files that include .h files"
     ok djm, sort of ok stevesk
     makes the pain stop in one easy step
     NB. portable commit contains everything *except* removing includes.h, as
     that will take a fair bit more work as we move headers that are required
     for portability workarounds to defines.h. (also, this step wasn't "easy")
2006-08-05 12:39:39 +10:00
Damien Miller
e3476ed03b - stevesk@cvs.openbsd.org 2006/07/22 20:48:23
[atomicio.c auth-options.c auth-passwd.c auth-rhosts.c auth-rsa.c]
     [auth.c auth1.c auth2-chall.c auth2-hostbased.c auth2-passwd.c auth2.c]
     [authfd.c authfile.c bufaux.c bufbn.c buffer.c canohost.c channels.c]
     [cipher-3des1.c cipher-bf1.c cipher-ctr.c cipher.c clientloop.c]
     [compat.c deattack.c dh.c dns.c gss-genr.c gss-serv.c hostfile.c]
     [includes.h kex.c kexdhc.c kexdhs.c kexgexc.c kexgexs.c key.c log.c]
     [mac.c match.c md-sha256.c misc.c moduli.c monitor.c monitor_fdpass.c]
     [monitor_mm.c monitor_wrap.c msg.c nchan.c packet.c rsa.c]
     [progressmeter.c readconf.c readpass.c scp.c servconf.c serverloop.c]
     [session.c sftp-client.c sftp-common.c sftp-glob.c sftp-server.c sftp.c]
     [ssh-add.c ssh-agent.c ssh-dss.c ssh-keygen.c ssh-keyscan.c]
     [ssh-keysign.c ssh-rsa.c ssh.c sshconnect.c sshconnect1.c sshconnect2.c]
     [sshd.c sshlogin.c sshpty.c ttymodes.c uidswap.c xmalloc.c]
     move #include <string.h> out of includes.h
2006-07-24 14:13:33 +10:00
Damien Miller
3f9418893e - djm@cvs.openbsd.org 2006/03/30 09:58:16
[authfd.c bufaux.c deattack.c gss-serv.c mac.c misc.c misc.h]
     [monitor_wrap.c msg.c packet.c sftp-client.c sftp-server.c ssh-agent.c]
     replace {GET,PUT}_XXBIT macros with functionally similar functions,
     silencing a heap of lint warnings. also allows them to use
     __bounded__ checking which can't be applied to macros; requested
     by and feedback from deraadt@
2006-03-31 23:13:02 +11:00
Damien Miller
57c30117c1 - djm@cvs.openbsd.org 2006/03/25 13:17:03
[atomicio.c auth-bsdauth.c auth-chall.c auth-options.c auth-passwd.c]
     [auth-rh-rsa.c auth-rhosts.c auth-rsa.c auth-skey.c auth.c auth1.c]
     [auth2-chall.c auth2-hostbased.c auth2-kbdint.c auth2-none.c]
     [auth2-passwd.c auth2-pubkey.c auth2.c authfd.c authfile.c bufaux.c]
     [buffer.c canohost.c channels.c cipher-3des1.c cipher-bf1.c]
     [cipher-ctr.c cipher.c cleanup.c clientloop.c compat.c compress.c]
     [deattack.c dh.c dispatch.c fatal.c groupaccess.c hostfile.c kex.c]
     [kexdh.c kexdhc.c kexdhs.c kexgex.c kexgexc.c kexgexs.c key.c log.c]
     [mac.c match.c md-sha256.c misc.c monitor.c monitor_fdpass.c]
     [monitor_mm.c monitor_wrap.c msg.c nchan.c packet.c progressmeter.c]
     [readconf.c readpass.c rsa.c scard.c scp.c servconf.c serverloop.c]
     [session.c sftp-client.c sftp-common.c sftp-glob.c sftp-server.c]
     [sftp.c ssh-add.c ssh-agent.c ssh-dss.c ssh-keygen.c ssh-keyscan.c]
     [ssh-keysign.c ssh-rsa.c ssh.c sshconnect.c sshconnect1.c]
     [sshconnect2.c sshd.c sshlogin.c sshpty.c sshtty.c ttymodes.c]
     [uidswap.c uuencode.c xmalloc.c]
     Put $OpenBSD$ tags back (as comments) to replace the RCSID()s that
     Theo nuked - our scripts to sync -portable need them in the files
2006-03-26 14:24:48 +11:00
Damien Miller
b0fb6872ed - deraadt@cvs.openbsd.org 2006/03/19 18:51:18
[atomicio.c auth-bsdauth.c auth-chall.c auth-krb5.c auth-options.c]
     [auth-pam.c auth-passwd.c auth-rh-rsa.c auth-rhosts.c auth-rsa.c]
     [auth-shadow.c auth-skey.c auth.c auth1.c auth2-chall.c]
     [auth2-hostbased.c auth2-kbdint.c auth2-none.c auth2-passwd.c]
     [auth2-pubkey.c auth2.c authfd.c authfile.c bufaux.c buffer.c]
     [canohost.c channels.c cipher-3des1.c cipher-acss.c cipher-aes.c]
     [cipher-bf1.c cipher-ctr.c cipher.c cleanup.c clientloop.c compat.c]
     [compress.c deattack.c dh.c dispatch.c dns.c entropy.c fatal.c]
     [groupaccess.c hostfile.c includes.h kex.c kexdh.c kexdhc.c]
     [kexdhs.c kexgex.c kexgexc.c kexgexs.c key.c log.c loginrec.c]
     [loginrec.h logintest.c mac.c match.c md-sha256.c md5crypt.c misc.c]
     [monitor.c monitor_fdpass.c monitor_mm.c monitor_wrap.c msg.c]
     [nchan.c packet.c progressmeter.c readconf.c readpass.c rsa.c]
     [scard.c scp.c servconf.c serverloop.c session.c sftp-client.c]
     [sftp-common.c sftp-glob.c sftp-server.c sftp.c ssh-add.c]
     [ssh-agent.c ssh-dss.c ssh-keygen.c ssh-keyscan.c ssh-keysign.c]
     [ssh-rand-helper.c ssh-rsa.c ssh.c sshconnect.c sshconnect1.c]
     [sshconnect2.c sshd.c sshlogin.c sshpty.c sshtty.c ttymodes.c]
     [uidswap.c uuencode.c xmalloc.c openbsd-compat/bsd-arc4random.c]
     [openbsd-compat/bsd-closefrom.c openbsd-compat/bsd-cygwin_util.c]
     [openbsd-compat/bsd-getpeereid.c openbsd-compat/bsd-misc.c]
     [openbsd-compat/bsd-nextstep.c openbsd-compat/bsd-snprintf.c]
     [openbsd-compat/bsd-waitpid.c openbsd-compat/fake-rfc2553.c]
     RCSID() can die
2006-03-26 00:03:21 +11:00
Damien Miller
eccb9de72a - djm@cvs.openbsd.org 2005/06/17 02:44:33
[auth-rsa.c auth.c auth1.c auth2-chall.c auth2-gss.c authfd.c authfile.c]
     [bufaux.c canohost.c channels.c cipher.c clientloop.c dns.c gss-serv.c]
     [kex.c kex.h key.c mac.c match.c misc.c packet.c packet.h scp.c]
     [servconf.c session.c session.h sftp-client.c sftp-server.c sftp.c]
     [ssh-keyscan.c ssh-rsa.c sshconnect.c sshconnect1.c sshconnect2.c sshd.c]
     make this -Wsign-compare clean; ok avsm@ markus@
     NB. auth1.c changes not committed yet (conflicts with uncommitted sync)
     NB2. more work may be needed to make portable Wsign-compare clean
2005-06-17 12:59:34 +10:00
Darren Tucker
c0815c927e - miod@cvs.openbsd.org 2003/09/18 13:02:21
[authfd.c bufaux.c dh.c mac.c ssh-keygen.c]
     A few signedness fixes for harmless situations; markus@ ok
2003-09-22 21:05:50 +10:00
Ben Lindstrom
6a24641365 - markus@cvs.openbsd.org 2002/05/16 22:02:50
[cipher.c kex.h mac.c]
     fix warnings (openssl 0.9.7 requires const)
2002-06-06 19:48:16 +00:00
Damien Miller
3672e4bc7a - markus@cvs.openbsd.org 2002/01/25 22:07:40
[kex.c kexdh.c kexgex.c key.c mac.c]
     use EVP_MD_size(evp_md) and not evp_md->md_size; ok steveks@
2002-02-05 11:54:07 +11:00
Damien Miller
9f0f5c64bc - deraadt@cvs.openbsd.org 2001/12/19 07:18:56
[auth1.c auth2.c auth2-chall.c auth-bsdauth.c auth.c authfile.c auth.h]
     [auth-krb4.c auth-rhosts.c auth-skey.c bufaux.c canohost.c channels.c]
     [cipher.c clientloop.c compat.c compress.c deattack.c key.c log.c mac.c]
     [match.c misc.c nchan.c packet.c readconf.c rijndael.c rijndael.h scard.c]
     [servconf.c servconf.h serverloop.c session.c sftp.c sftp-client.c]
     [sftp-glob.c sftp-int.c sftp-server.c ssh-add.c ssh-agent.c ssh.c]
     [sshconnect1.c sshconnect2.c sshconnect.c sshd.8 sshd.c sshd_config]
     [ssh-keygen.c sshlogin.c sshpty.c sshtty.c ttymodes.c uidswap.c]
     basic KNF done while i was looking for something else
2001-12-21 14:45:46 +11:00
Ben Lindstrom
a3700050ec - markus@cvs.openbsd.org 2001/04/05 10:42:57
[auth-chall.c authfd.c channels.c clientloop.c kex.c kexgex.c key.c
      mac.c packet.c serverloop.c sftp-client.c sftp-client.h sftp-glob.c
      sftp-glob.h sftp-int.c sftp-server.c sftp.c ssh-keygen.c sshconnect.c
      sshconnect2.c sshd.c]
     fix whitespace: unexpand + trailing spaces.
2001-04-05 23:26:32 +00:00
Ben Lindstrom
06b33aa0e8 - markus@cvs.openbsd.org 2001/02/11 12:59:25
[Makefile.in sshd.8 sshconnect2.c readconf.h readconf.c packet.c
      sshd.c ssh.c ssh.1 servconf.h servconf.c myproposal.h kex.h kex.c]
     1) clean up the MAC support for SSH-2
     2) allow you to specify the MAC with 'ssh -m'
     3) or the 'MACs' keyword in ssh(d)_config
     4) add hmac-{md5,sha1}-96
             ok stevesk@, provos@
2001-02-15 03:01:59 +00:00