Well, I kinda have a task where I have to take a file and generate MD5 hash of that file. Problem is that I can't really use any classes that would automate this processes so everything has to be programmed manually. And that prob would mean that I can't use java.security.MessageDigest >> getInstance("MD5") to get an MD5 message. So yeah I am not really sure how to write needed algorithm because it seems that everyone uses MessageDiggest Class. Any ideas?
How to manually write MD5 (to get the hash of a file) algorithm in Java?
1k Views Asked by Jame Moore At
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Benoit
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Well I see 2 options:
Either you write your own java version, starting from the algorithm written in pseudo-code.
Or you try to reverse-engineer an existing one. If you use java 8, you have to look at the class
sun.security.provider.MD5
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I found this implementation of MD5: https://rosettacode.org/wiki/MD5/Implementation#Java
I haven't tested if this is 100% correct though