Maybe something like this:
>perl -wMstrict -le
"my $binary = pack 'H*', '03762cefa7ffe5';
printf '%02x ', $_ for unpack 'C*', $binary; print '';
my ($p, $q) = unpack 'xCC', $binary;
my $pairs = (length($binary) - 3) / 2;
my $k = pack 'C*', 0, 0, 0, ($p, $q) x $pairs;
printf '%02x ', $_ for unpack 'C*', $k; print '';
my $decode = $binary ^ $k;
printf '%02x ', $_ for unpack 'C*', $decode;
03 76 2c ef a7 ff e5
00 00 00 76 2c 76 2c
03 76 2c 99 8b 89 c9
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