How do I create a SHA1 hash in ruby?

Question

SHA Hash functions

Answer 1

Where 'serialize' is some user function defined elsewhere.

 def generateKey(data)
    return Digest::SHA1.hexdigest ("#{serialize(data)}")
 end

Answer 2

require 'digest/sha1'
Digest::SHA1.hexdigest 'foo'

Answer 3

For a Base64 encoded hash, to validated an Oauth signature, I used

require 'base64'
require 'hmac-sha1'

Base64.encode64((HMAC::SHA1.new('key') << 'base').digest).strip

Answer 4

I created a helper gem which is a simple wrapper around some sha1 code

require 'rickshaw'
> Rickshaw::SHA1.hash('LICENSE.txt')

 => "4659d94e7082a65ca39e7b6725094f08a413250a" 

> "hello world".to_sha1

 => "2aae6c35c94fcfb415dbe95f408b9ce91ee846ed"