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#!/usr/bin/perl
use strict;
use warnings;
use MIME::Base64;
use NGCP::Rtpclient::SRTP;
my $cs = $NGCP::Rtpclient::SRTP::crypto_suites{$ARGV[0]} or die;
my $inline_key = $ARGV[1] or die;
my ($key, $salt) = NGCP::Rtpclient::SRTP::decode_inline_base64($inline_key, $cs);
my ($skey, $sauth, $ssalt) = NGCP::Rtpclient::SRTP::gen_rtp_session_keys($key, $salt);
print("Master key: " . unpack("H*", $key) . "\n");
print("Master salt: " . unpack("H*", $salt) . "\n");
print("RTP session key: " . unpack("H*", $skey) . "\n");
print("RTP session auth key: " . unpack("H*", $sauth) . "\n");
print("RTP session salt: " . unpack("H*", $ssalt) . "\n");
my $pack = $ARGV[2];
my @pack;
if ($pack =~ /:/) {
my @pack = split(/:/, $pack);
$pack = join('', (map {chr(hex($_))} @pack));
}
else {
$pack = pack("H*", $pack);
}
my $in_roc = $ARGV[3] // 0;
print("Packet length: " . length($pack) . " bytes\n");
my ($dec, $out_roc, $tag, $hmac) = NGCP::Rtpclient::SRTP::decrypt_rtp($cs, $skey, $ssalt, $sauth, $in_roc, $pack);
print("Auth tag from packet: " . unpack("H*", $tag) . "\n");
print("Computed auth tag: " . unpack("H*", $hmac) . "\n");
print("Decoded packet: " . unpack("H*", $dec) . "\n");
print("ROC: $out_roc\n");
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