[openssl-users] Fwd: Does TLSv1.2 support 3DES

Viktor Dukhovni openssl-users at dukhovni.org
Wed Aug 9 18:15:01 UTC 2017

On Wed, Aug 09, 2017 at 04:07:30PM +0000, Salz, Rich via openssl-users wrote:

> > From [this][1] link I can see that TLS1.2 does not have 3DES in their available
> > cipher list. So I guess it does not support?
> Right:
> ; ./apps/openssl ciphers -v HIGH+TLSv1.2:!MD5:!SHA1 | grep DES
> ; ./apps/openssl ciphers -v TLSv1.2:!MD5:!SHA1 | grep DES
> ; ./apps/openssl ciphers -v TLSv1.2 | grep DES

This is wrong.  The "TLSv1.2" ciphers are just the ciphers that
are *new* in TLS 1.2.  A number of TLS 1.2 ciphers date back to
SSLv3.  The right way to see TLS 1.2 3DES ciphers is:

    $ openssl ciphers -s tls1_2 -V 3DES
          0xC0,0x12 - ECDHE-RSA-DES-CBC3-SHA  SSLv3 Kx=ECDH     Au=RSA  Enc=3DES(168) Mac=SHA1
          0xC0,0x08 - ECDHE-ECDSA-DES-CBC3-SHA SSLv3 Kx=ECDH     Au=ECDSA Enc=3DES(168) Mac=SHA1
          0xC0,0x1C - SRP-DSS-3DES-EDE-CBC-SHA SSLv3 Kx=SRP      Au=DSS  Enc=3DES(168) Mac=SHA1
          0xC0,0x1B - SRP-RSA-3DES-EDE-CBC-SHA SSLv3 Kx=SRP      Au=RSA  Enc=3DES(168) Mac=SHA1
          0xC0,0x1A - SRP-3DES-EDE-CBC-SHA    SSLv3 Kx=SRP      Au=SRP  Enc=3DES(168) Mac=SHA1
          0x00,0x16 - EDH-RSA-DES-CBC3-SHA    SSLv3 Kx=DH       Au=RSA  Enc=3DES(168) Mac=SHA1
          0x00,0x13 - EDH-DSS-DES-CBC3-SHA    SSLv3 Kx=DH       Au=DSS  Enc=3DES(168) Mac=SHA1
          0x00,0x10 - DH-RSA-DES-CBC3-SHA     SSLv3 Kx=DH/RSA   Au=DH   Enc=3DES(168) Mac=SHA1
          0x00,0x0D - DH-DSS-DES-CBC3-SHA     SSLv3 Kx=DH/DSS   Au=DH   Enc=3DES(168) Mac=SHA1
          0xC0,0x17 - AECDH-DES-CBC3-SHA      SSLv3 Kx=ECDH     Au=None Enc=3DES(168) Mac=SHA1
          0x00,0x1B - ADH-DES-CBC3-SHA        SSLv3 Kx=DH       Au=None Enc=3DES(168) Mac=SHA1
          0xC0,0x0D - ECDH-RSA-DES-CBC3-SHA   SSLv3 Kx=ECDH/RSA Au=ECDH Enc=3DES(168) Mac=SHA1
          0xC0,0x03 - ECDH-ECDSA-DES-CBC3-SHA SSLv3 Kx=ECDH/ECDSA Au=ECDH Enc=3DES(168) Mac=SHA1
          0x00,0x0A - DES-CBC3-SHA            SSLv3 Kx=RSA      Au=RSA  Enc=3DES(168) Mac=SHA1
          0x00,0x8B - PSK-3DES-EDE-CBC-SHA    SSLv3 Kx=PSK      Au=PSK  Enc=3DES(168) Mac=SHA1

See Appendix A.5 of RFC5246 for some of the above 3DES codepoints.
See also the IANA TLS ciphersuite registry.


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