Compute an MD5 sum in JavaScript and access it as bits.

Question

I have a project where I want to compute an MD5 sum in JavaScript but I want to then break it up into chunks (as it happens I want 3 bits at a time). Are there any implementation I can use that make this easy to do? (BTW I already found this MD5 implementation that returns a string.)

Option I've thought of:

• Hack that implementation to emit octal.
• Consume a hex string 3 places at a time and re-slice it.

Anyone know of something simpler?

Answer 1

Maybe convert it to an array of integers and extract the desired values by bitwise logical operators and bit-shifts?..

Answer 2

I think your two solutions are probably the easiest you're going to get. In particular, since that implementation uses an array-of-ints representation internally, it'd probably be pretty easy to make a companion function to the existing b64 and hex encoding functions which outputs your desired format.