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What is a SHA-1 Hash? SHA-1 (Secure Hash Algorithm) is a 160 bit cryptographic hash function created by the NSA in 1995. It creates a 40 byte hash value for the input of the algorithm. SHA-1 is one-way, meaning that the original input cannot be be determined simply by knowing the hash value.
require 'digest/sha1'
Digest::SHA1.hexdigest 'foo'
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
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"
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