[Freeswitch-users] SRTP crypto selection

Sun Mar 25 19:36:43 UTC 2018

Hi,

Seems like it's zoiper guys only who might have created that bug request 
coz I was going to do the same but this makes things easier for me and yes 
it's the same thing I'm talking about so far.

On March 25, 2018 8:22:34 PM Joel Serrano <joel at gogii.net> wrote:
Not sure if this is related: https://freeswitch.org/jira/browse/FS-11052

On Sat, Mar 24, 2018 at 11:17 PM, Bipin Patel <bipin at xbipin.com> wrote:

hi,

i had reported this to zoiper team and they said they have talked to FS 
team about this and its related to crypto naming convention in the RFC 
standards and it should be fixed in FS so eagerly waiting for the patch

Regards,
Bipin

-------- Original Message --------
Subject: Re: [Freeswitch-users] SRTP crypto selection
From: Bipin Patel <bipin at xbipin.com>
To: FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org>
Date: 3/16/2018, 7:56:08 PM
HI,

it seems many other dialers also send the crypto in a similar way so all 
cant be wrong i guess, should i file a bug request in FS?

Regards,
Bipin

-------- Original Message --------
Subject: Re: [Freeswitch-users] SRTP crypto selection
From: Bipin Patel <bipin at xbipin.com>
To: FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org>
Date: 3/16/2018, 12:22:37 AM
Hi,

Thanks for that link but the other thing is the below line where zoiper 
sends a crypto that looks alike but the placement of characters is 
different so doesn't match so is zoiper doing it wrongly or it's a total 
different crypto that FS doesn't support

switch_core_media.c:1479 looking for crypto suite [AES_CM_192_HMAC_SHA1_32] 
in [4 AES_192_CM_HMAC_SHA1_32

On March 15, 2018 4:15:59 PM Jurijs Ivolga <jurijs.ivolga at gmail.com> wrote:
Hi,

Have you checked this:

https://freeswitch.org/confluence/display/FREESWITCH/rtp_secure_media

With kind regards,

Jurijs

On Thu, Mar 15, 2018 at 2:03 PM, Bipin Patel <bipin at xbipin.com> wrote:

hi,

is it possible to force a selected crypto for SRTP as i cant seem to find a 
way to force a crypto to the user such that is phone uses that for media, 
secondly i see zoiper sends the below in SDP

a=crypto:5 AES_256_CM_HMAC_SHA1_80 
inline:854nJNIKSyhr0sJs+Ol+Qv2eSqC2gnydK8iVHUAXb4Xx7oW8iMM2jVi7R9xV6A==
a=crypto:6 AES_256_CM_HMAC_SHA1_32 
inline:854nJNIKSyhr0sJs+Ol+Qv2eSqC2gnydK8iVHUAXb4Xx7oW8iMM2jVi7R9xV6A==
a=crypto:3 AES_192_CM_HMAC_SHA1_80 
inline:854nJNIKSyhr0sJs+Ol+Qv2eSqC2gnydK8iVHUAXb4Xx7oW8iMM=
a=crypto:4 AES_192_CM_HMAC_SHA1_32 
inline:854nJNIKSyhr0sJs+Ol+Qv2eSqC2gnydK8iVHUAXb4Xx7oW8iMM=
a=crypto:1 AES_CM_128_HMAC_SHA1_80 
inline:854nJNIKSyhr0sJs+Ol+Qv2eSqC2gnydK8iVHUAX
a=crypto:2 AES_CM_128_HMAC_SHA1_32 
inline:854nJNIKSyhr0sJs+Ol+Qv2eSqC2gnydK8iVHUAX

where as FS always uses the below only

switch_core_media.c:1484 Found suite AES_CM_128_HMAC_SHA1_80

and also i noticed FS and zoiper have some variations in crypto names such as

switch_core_media.c:1479 looking for crypto suite [AES_CM_192_HMAC_SHA1_32] 
in [4 AES_192_CM_HMAC_SHA1_32

and this never matches and never used at all (notice the placement of 
CM_192 in FS whereas zoiper has 192_CM)

--
Regards,
Bipin

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