jose-jws.rb

require 'jose'

# HS256 Symmetric Signature
secret = 'some128bitsecret'
jwk = JOSE::JWK.from_oct(secret)
header = { "alg" => "HS256" }
payload    = { "iss" => "Chris Larsen", 
							 "sub" => "JWTs", 
							 "aud" => "Silicon Halton Software P2P", 
							 "iat" => 1540121863 }

signed_hs256 = JOSE::JWT.sign(jwk, header, payload).compact
puts "Signed and Encoded JWS: #{signed_hs256}"

verification = JOSE::JWT.verify_strict(jwk, ["HS256"], signed_hs256)
puts "Verification of JWS: #{verification.first}"

# RS256 Assymetric Signature
private_key = JOSE::JWK.generate_key([:rsa, 4096])
public_key = JOSE::JWK.to_public(private_key)
header = { "alg" => "RS256" }

signed_rs256 = JOSE::JWT.sign(private_key, header, payload).compact
puts "Signed and Encoded JWS: #{signed_rs256}"

verification = JOSE::JWT.verify_strict(public_key, ["RS256"], signed_rs256)
puts "Verification of JWS: #{verification.first}"