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+--- Thread: How to solve some strange hash of hack.chat (/thread-10907.html)
How to solve some strange hash of hack.chat - huolongguo10 - 07-27-2022
I have a hash algorithm:
Code:
const hash = (password) => {
const sha = crypto.createHash('sha256');
sha.update(password+SALT);
return sha.digest('base64').substr(0, 6);
};But it just uses first 6 bytes after base64.
How can I solve it?
RE: How to solve some strange hash of hack.chat - DanielG - 07-27-2022
This is not something hashcat can do. Also the first 6 bytes of base64 only gives you the first 4 bytes of the hash. So you lose 224 bits of info about the hash. This will result in *a lot* of false positives for the password+SALT combination resulting in those 4 bytes.
I doubt this is worth your time.
RE: How to solve some strange hash of hack.chat - huolongguo10 - 07-27-2022
(07-27-2022, 09:48 AM)DanielG Wrote: This is not something hashcat can do. Also the first 6 bytes of base64 only gives you the first 4 bytes of the hash. So you lose 224 bits of info about the hash. This will result in *a lot* of false positives for the password+SALT combination resulting in those 4 bytes.Oh I just need to get one possible answer of the password.
I doubt this is worth your time.
RE: How to solve some strange hash of hack.chat - Snoopy - 07-27-2022
(07-27-2022, 01:46 PM)huolongguo10 Wrote:(07-27-2022, 09:48 AM)DanielG Wrote: This is not something hashcat can do. Also the first 6 bytes of base64 only gives you the first 4 bytes of the hash. So you lose 224 bits of info about the hash. This will result in *a lot* of false positives for the password+SALT combination resulting in those 4 bytes.Oh I just need to get one possible answer of the password.
I doubt this is worth your time.
do you know the salt and the 6 bytes? if yes, implement this "algorithm" in any programming/scripting language and feed this with bruteforce generated strings and break when this algo hits your 6 bytes (feeding incrementing numbers only maybe also work) well this sounds like a funny "give it a try" project for tomorrow (i will try to find a collision with numbers for sha(string+SALT)