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|
module JSON
class JWK < ActiveSupport::HashWithIndifferentAccess
class UnknownAlgorithm < JWT::Exception; end
def initialize(params = {}, ex_params = {})
case params
when OpenSSL::PKey::RSA, OpenSSL::PKey::EC
super params.to_jwk(ex_params)
when OpenSSL::PKey::PKey
raise UnknownAlgorithm.new('Unknown Key Type')
when String
super(
k: params,
kty: :oct
)
merge! ex_params
else
super params
merge! ex_params
end
self[:kid] ||= thumbprint rescue nil #ignore
end
def content_type
'application/jwk+json'
end
def thumbprint(digest = OpenSSL::Digest::SHA256.new)
digest = case digest
when OpenSSL::Digest
digest
when String, Symbol
OpenSSL::Digest.new digest.to_s
else
raise UnknownAlgorithm.new('Unknown Digest Algorithm')
end
UrlSafeBase64.encode64 digest.digest(normalize.to_json)
end
def to_key
case
when rsa?
to_rsa_key
when ec?
to_ec_key
when oct?
self[:k]
else
raise UnknownAlgorithm.new('Unknown Key Type')
end
end
private
def rsa?
self[:kty].try(:to_sym) == :RSA
end
def ec?
self[:kty].try(:to_sym) == :EC
end
def oct?
self[:kty].try(:to_sym) == :oct
end
def normalize
case
when rsa?
{
e: self[:e],
kty: self[:kty],
n: self[:n]
}
when ec?
{
crv: self[:crv],
kty: self[:kty],
x: self[:x],
y: self[:y]
}
when oct?
{
k: self[:k],
kty: self[:kty]
}
else
raise UnknownAlgorithm.new('Unknown Key Type')
end
end
def to_rsa_key
e, n, d, p, q = [:e, :n, :d, :p, :q].collect do |key|
if self[key]
OpenSSL::BN.new UrlSafeBase64.decode64(self[key]), 2
end
end
key = OpenSSL::PKey::RSA.new
key.e = e
key.n = n
key.d = d if d
key.p = p if p
key.q = q if q
key
end
def to_ec_key
curve_name = case self[:crv].try(:to_sym)
when :'P-256'
'prime256v1'
when :'P-384'
'secp384r1'
when :'P-521'
'secp521r1'
else
raise UnknownAlgorithm.new('Unknown EC Curve')
end
x, y, d = [:x, :y, :d].collect do |key|
if self[key]
OpenSSL::BN.new UrlSafeBase64.decode64(self[key]), 2
end
end
key = OpenSSL::PKey::EC.new curve_name
key.private_key = d if d
key.public_key = OpenSSL::PKey::EC::Point.new(
OpenSSL::PKey::EC::Group.new(curve_name),
OpenSSL::BN.new(['04' + x.to_s(16) + y.to_s(16)].pack('H*'), 2)
)
key
end
end
end
|
