42 lines
752 B
Ruby
42 lines
752 B
Ruby
module JSONWebToken
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class RSAToken < Token
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attr_reader :key_file
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def initialize(key_file)
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super()
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@key_file = key_file
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end
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def encoded
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headers = {
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kid: kid
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}
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JWT.encode(payload, key, 'RS256', headers)
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end
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private
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def key_data
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@key_data ||= File.read(key_file)
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end
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def key
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@key ||= OpenSSL::PKey::RSA.new(key_data)
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end
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def public_key
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key.public_key
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end
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def kid
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# calculate sha256 from DER encoded ASN1
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kid = Digest::SHA256.digest(public_key.to_der)
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# we encode only 30 bytes with base32
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kid = Base32.encode(kid[0..29])
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# insert colon every 4 characters
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kid.scan(/.{4}/).join(':')
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end
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end
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end
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