Keygen for Siglent Spectrum Analyzers

# Keygen for Siglent Spectrum Analyzers
# Beware:
#   > Only tested on SVA1015X
#   > Output features must be entered in lower case!

import hashlib

# You get this by running "SCOPEID?" at the SCPI prompt; Interface available via HTTP on the device IP address.
SCOPEID = ''
# Select one of the four options below. Beware the SVA1015X tested required 'SVA1000X' as the model.
# 'SVA1000X','SVA1015X','SVA1032X','SVA1075X'
Model = ''

otheropt = ('AMK', 'EMI', 'DMA', 'AMA', 'DTF')

hashkey = '5zao9lyua01pp7hjzm3orcq90mds63z6zi5kv7vmv3ih981vlwn06txnjdtas3u2wa8msx61i12ueh14t7kqwsfskg032nhyuy1d9vv2wm925rd18kih9xhkyilobbgy'

def gen(x):
    h = hashlib.md5((
        hashkey +
        Model.ljust(32, '\x00') +
        opt.ljust(5, '\x00') +
        SCOPEID.ljust(32, '\x00') +
        '\x00'*48).encode('ascii')
    ).digest()
    key = ''
    for b in h:
        if (b <= 0x2F or b > 0x39) and (b <= 0x60 or b > 0x7A):
            m = b % 0x24
            b = m + (0x57 if m > 9 else 0x30)
        if b == 0x30:
            b = 0x32
        if b == 0x31:
            b = 0x33
        if b == 0x6c:
            b = 0x6d
        if b == 0x6f:
            b = 0x70
        key += chr(b)
    return key.lower()

for opt in otheropt:
    print('{:5} {}'.format(opt, gen(SCOPEID)))