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September 12, 2021 06:09
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md5 hashing in j
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| 0 : 0 | |
| Can you crack Aaron’s password hash? He seems to like | |
| simple passwords. I’m sure he’ll use his name and birthday | in it. Hint: Aaron writes important dates as YYYYMMDD | |
| rather than YYYY-MM-DD or any other special character | separator. Hash: 7f4986da7d7b52fa81f98278e6ec9dcb. | |
| Author: moat, Pacific Northwest National Laboratory | |
| ) | |
| y=:":"0 (1900 + i.120) | |
| m=:(i.11) { ('0' ,"1 ":"0 (1+i.9)) , ('1' ,"1 ":"0 (1+i.9)) | |
| d=:('0' ,"1 ":"0 (1+i.9)) , (":"0) 10+i.22 | |
| md5=:15&(128!:6) | |
| NB. md5 'foo' | |
| NB. acbd18db4cc2f85cedef654fccc4a4d8 |
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require 'format/printf'
dates=:,/ (1+i.31) ,"1 0/~ ,/ (1900+i.120) ,"0/ (1+i.12)
sdates =: '%d%02d%02d' sprintf dates
passwords=:'Aaron',"1 1 sdates
hashes=:md5 passwords
NB. Compare the needle with the haystack.
NB. This compares each character and returns a list of bools for each comparison.
NB. Then we sum the bits together.
sums =: +/"1 '7f4986da7d7b52fa81f98278e6ec9dcb' ="1 1 hashes
NB. Find the index of a match
sums i: 32
NB. Grab the matching password
(sums i: 32) { passwords