http://cs.i2p/blog/port-striping-v2
For RSA, it would be "0=0x45000072". As for the 0x38 at byte offset 28, that one will require a mask. Again, since u32 works in 4-byte blocks, but we only require the first byte of a 4-byte block, we're going to subtract 3 from the offset, so 28-3=25.