gteissier / srtp-decrypt Goto Github PK

just reading the code and find something seems not reasonable.

Uses a int16 to get the diff. When seq is high, it gives a wrong diff.
diff should be uint16_t

Hello,

I've used it ti decrypt 128, but when decrypting 256 and setting the key, it returns:

# ./srtp-decrypt -k rqGTx7wtnvkAxNO2sj2Xt6iY79Ftg6UsiPuWtAn4ZqYMgfwxAMLcR7surqBYMA== < /ile.pcap > file.hex
srtp-decrypt: srtp-decrypt.c:41: decode_sdes: Assertion `len == 40' failed.

I am attempting to decrypt the Secure Real-time Transport Protocol (SRTP) stream contained within a capture file named temp.pcap. The data within this file is encrypted using the AES_CM_128_HMAC_SHA1_80 crypto suite.

1. Decryption Command:
   srtp-decrypt.exe -s AES_CM_128_HMAC_SHA1_80 -b cL2VhwSL12YShG/u/eNSrfaqgsSCOjjlyUwJBywl -p temp.pcap -d srtp -m rtp -a
2. The crypto suite information, as retrieved from the Session Description Protocol (SDP) portion of a SIP message, is:
   crypto:3 AES_CM_128_HMAC_SHA1_80 inline:cL2VhwSL12YShG/u/eNSrfaqgsSCOjjlyUwJBywl

When executing the provided decryption command, I am consistently receiving an authentication failure error for all RTP packets.

1. Sample Capture File:
   If possible, could you kindly provide a sample Wireshark capture file that I can use for decryption purposes? This would be immensely helpful in verifying the decryption process and ensuring the correctness of my command.

2. Command Verification:
   If a sample capture file is unavailable, could you please review the decryption command I have provided and confirm if there are any potential errors or syntax issues that might be causing the authentication failure?

I appreciate your time and assistance in resolving this decryption challenge.

Hi All, and thanks gteissier for having this Git!

I was trying to make the srtp-decrypt but when doing so the following error popout:
root@testlinuxsebastian:~/srtp-decrypt# make -d
GNU Make 4.1
Built for x86_64-pc-linux-gnu
Copyright (C) 1988-2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl.html
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
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cc -g -Os -Wall -c -o srtp.o srtp.c
Putting child 0x932f40 (srtp.o) PID 6809 on the chain.
Live child 0x932f40 (srtp.o) PID 6809
make: cc: Command not found
Reaping losing child 0x932f40 PID 6809
: recipe for target 'srtp.o' failed
make: *** [srtp.o] Error 127
Removing child 0x932f40 PID 6809 from chain.

Is there any fix for this_?
Thanks,

Sebastian T

I am getting a segmentation fault error when I use a key with more than 40 characters in length ? I assume there is no change in RTP offset. What would be the problem ?

from rfc3550:

The header extension contains a 16-bit length field that
counts the number of 32-bit words in the extension, excluding the
four-octet extension header (therefore zero is a valid length).

should be
offset += htons (extlen)*4; // skips RTP extension header