Hex to String convertion

Question

I have a string like this :

message='भी मिलता था। सरोपा #variable# भेंट करना अब शायद सिर्फ सिख परंपरा में ही बचा समाज की #variable# गहराई नापते रहे हैं गुणाधर'

I have converted this string to hex using

output = ''.join(hex(ord(c)) for c in message) 

output1 = output.replace('0x','0')

and the final hex is :

'092d0940020092e093f09320924093e0200925093e096402009380930094b092a093e02002307606107206906106206c065023020092d09470902091f020091509300928093e0200905092c0200936093e092f09260200938093f0930094d092b0200938093f0916020092a09300902092a0930093e020092e0947090202009390940020092c091a093e0200938092e093e091c0200915094002002307606107206906106206c065023020091709390930093e09080200928093e092a09240947020093009390947020093909480902020091709410923093e09270930'

How can I get back my original string from encoded hex?

OR How can I get back my original string from output(without replacing)?

Possible duplicate of [Convert from ASCII string encoded in Hex to plain ASCII?](https://stackoverflow.com/questions/9641440/convert-from-ascii-string-encoded-in-hex-to-plain-ascii) — Sociopath, Mar 08 '19 at 04:28
@AkshayNevrekar i have already tried that one but its not working — Vani Polnedi, Mar 08 '19 at 04:35
@Mntfr i have tried that but i'm getting output ( hex ) in different way .... i want my original string back without any change in hex code — Vani Polnedi, Mar 08 '19 at 04:37
How can you distinguish between a `'0'` that was originally a `'0'` and one that is a replacement for `'0x'`? - you lost some information there. Will you always know the original character set/encoding? — wwii, Mar 08 '19 at 04:43
@VaniPolnedi I just saw your edit, which is way simpler when you can keep the `0x` ! :) — BlueSheepToken, Mar 11 '19 at 09:56

score 2 · Answer 1 · answered Mar 08 '19 at 04:50

2

The binascii library already has functions for coding and encoding in hex

import binascii

message='भी मिलता था। सरोपा #variable# भेंट करना अब शायद सिर्फ सिख परंपरा में ही बचा समाज की #variable# गहराई नापते रहे हैं गुणाधर'
messageEncoded = binascii.hexlify(message.encode())
print(messageEncoded)

messageDecoded =  binascii.unhexlify(messageEncoded)
print(messageDecoded.decode())

answered Mar 08 '19 at 04:50

Mntfr

483
6
20

i want hex code like above only ( '092d0940020092e093f09320924093e0200925093e096402009380930094b092a093e02002307606107206906106206c065023020092d09470902091f020091509300928093e0200905092c0200936093e092f09260200938093f0930094d092b0200938093f0916020092a09300902092a0930093e020092e0947090202009390940020092c091a093e0200938092e093e091c0200915094002002307606107206906106206c065023020091709390930093e09080200928093e092a09240947020093009390947020093909480902020091709410923093e09270930' ) – Vani Polnedi Mar 08 '19 at 05:24
for case 2: without replacing how can i get back my original string? – Vani Polnedi Mar 11 '19 at 07:00

score 1 · Answer 2 · answered Mar 11 '19 at 09:55

1

As some commentaries already specified, it is impossible to decode if you replace 0x by 0, the closest I could get is the following

# Deencoding
hexs = []
tmp = ''
for i in range(len(output1)):
    if i < len(output1) - 1 and output1[i] == '0' and output1[i+1] != '0':
        hexs.append(tmp)
        tmp = ''
    else:
        tmp += output1[i]
if tmp != '':
    hexs.append(tmp)

print(''.join(chr(int(c,16)) for c in hexs[1:]))

Which will fail because in your hex code you have 902, how do you determine if it is 2 characters 9 and 2 or only one 902?

If you can keep the 0x, you can simply use the other commands to get it back with int and chr as follow

print(''.join(chr(int(c, 16)) for c in output[2:].split('0x')))

But the best way to do what you want is probably to use binascii

answered Mar 11 '19 at 09:55

BlueSheepToken

5,751
3
17
42

Thank you, It worked well for output. Let me check for output1 also. – Vani Polnedi Mar 11 '19 at 10:24
@VaniPolnedi It does not work :( some of the characters are wrong, because there is no way to differentiate `209` from `2` and `9` unfortunately, it is close enough but not the same ^^ – BlueSheepToken Mar 11 '19 at 10:25
Can i get back my output from output1? – Vani Polnedi Mar 12 '19 at 04:30
in my code i have 902 which determines only one 902 not 2 characters – Vani Polnedi Mar 12 '19 at 06:27
I agree. But you cannot determine a logic which is not hardcoded to split on some zeros but not all (which means How can you tell a computer "20902" is "2 902" and not "209 2"? – BlueSheepToken Mar 12 '19 at 07:19
@VaniPolnedi So basically, it is impossible to get back your hex from output1 without hardcoding the solution a bit – BlueSheepToken Mar 12 '19 at 08:17
@VaniPolnedi Have you got any question or do you have any insights on how the split can be performed? – BlueSheepToken Mar 12 '19 at 14:01
solved this case in another way ( changed hex encoding but output is same ) – Vani Polnedi Mar 14 '19 at 05:28

Hex to String convertion

2 Answers2