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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
calculate_default_kid if self[:kid].blank?
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
Base64.urlsafe_encode64 digest.digest(normalize.to_json), padding: false
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
def rsa?
self[:kty]&.to_sym == :RSA
end
def ec?
self[:kty]&.to_sym == :EC
end
def oct?
self[:kty]&.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
private
def calculate_default_kid
self[:kid] = thumbprint
rescue
# ignore
end
def to_rsa_key
e, n, d, p, q, dp, dq, qi = [:e, :n, :d, :p, :q, :dp, :dq, :qi].collect do |key|
if self[key]
OpenSSL::BN.new Base64.urlsafe_decode64(self[key]), 2
end
end
# Public key
data_sequence = OpenSSL::ASN1::Sequence([
OpenSSL::ASN1::Integer(n),
OpenSSL::ASN1::Integer(e),
])
if d && p && q && dp && dq && qi
data_sequence = OpenSSL::ASN1::Sequence([
OpenSSL::ASN1::Integer(0),
OpenSSL::ASN1::Integer(n),
OpenSSL::ASN1::Integer(e),
OpenSSL::ASN1::Integer(d),
OpenSSL::ASN1::Integer(p),
OpenSSL::ASN1::Integer(q),
OpenSSL::ASN1::Integer(dp),
OpenSSL::ASN1::Integer(dq),
OpenSSL::ASN1::Integer(qi),
])
end
asn1 = OpenSSL::ASN1::Sequence(data_sequence)
OpenSSL::PKey::RSA.new(asn1.to_der)
end
def to_ec_key
curve_name = case self[:crv]&.to_sym
when :'P-256'
'prime256v1'
when :'P-384'
'secp384r1'
when :'P-521'
'secp521r1'
when :secp256k1
'secp256k1'
else
raise UnknownAlgorithm.new('Unknown EC Curve')
end
x, y, d = [:x, :y, :d].collect do |key|
if self[key]
Base64.urlsafe_decode64(self[key])
end
end
point = OpenSSL::PKey::EC::Point.new(
OpenSSL::PKey::EC::Group.new(curve_name),
OpenSSL::BN.new(['04' + x.unpack('H*').first + y.unpack('H*').first].pack('H*'), 2)
)
# Public key
data_sequence = OpenSSL::ASN1::Sequence([
OpenSSL::ASN1::Sequence([
OpenSSL::ASN1::ObjectId("id-ecPublicKey"),
OpenSSL::ASN1::ObjectId(curve_name)
]),
OpenSSL::ASN1::BitString(point.to_octet_string(:uncompressed))
])
if d
# Private key
data_sequence = OpenSSL::ASN1::Sequence([
OpenSSL::ASN1::Integer(1),
OpenSSL::ASN1::OctetString(OpenSSL::BN.new(d, 2).to_s(2)),
OpenSSL::ASN1::ObjectId(curve_name, 0, :EXPLICIT),
OpenSSL::ASN1::BitString(point.to_octet_string(:uncompressed), 1, :EXPLICIT)
])
end
OpenSSL::PKey::EC.new(data_sequence.to_der)
end
end
end
|
