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rsa.clj
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rsa.clj
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;; Copyright (c) 2014-2018 Andrey Antukh <niwi@niwi.nz>
;; Copyright (c) 2017-2018 Denis Shilov <sxp@bk.ru>
;;
;; Licensed under the Apache License, Version 2.0 (the "License")
;; you may not use this file except in compliance with the License.
;; You may obtain a copy of the License at
;;
;; http://www.apache.org/licenses/LICENSE-2.0
;;
;; Unless required by applicable law or agreed to in writing, software
;; distributed under the License is distributed on an "AS IS" BASIS,
;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
;; See the License for the specific language governing permissions and
;; limitations under the License.
(ns buddy.core.keys.jwk.rsa
"JWK support for RSA keys"
(:require [buddy.core.codecs.base64 :as b64]
[buddy.core.codecs :as codecs]
[buddy.core.keys.jwk.proto :as proto]
[buddy.core.hash :as hash]
[cheshire.core :as json])
(:import (java.security.interfaces RSAPrivateKey RSAPublicKey)
(java.io StringWriter)
(com.fasterxml.jackson.core JsonGenerator)
(java.security KeyFactory)
(java.security.spec RSAPrivateKeySpec RSAPublicKeySpec)))
(defmethod proto/jwk->private-key "RSA"
[jwk]
;; TODO: add support for CRT representation (dp, dq, etc)
;; TODO: https://tools.ietf.org/html/rfc7517#section-9.3
(let [n (proto/b64str->bigint (:n jwk))
d (proto/b64str->bigint (:d jwk))
kf (KeyFactory/getInstance "RSA" "BC")]
(.generatePrivate kf (RSAPrivateKeySpec. n d))))
(defmethod proto/jwk->public-key "RSA"
[jwk]
(let [n (proto/b64str->bigint (:n jwk))
e (proto/b64str->bigint (:e jwk))
kf (KeyFactory/getInstance "RSA" "BC")]
(.generatePublic kf (RSAPublicKeySpec. n e))))
(defmethod proto/public-key->jwk RSAPublicKey
[^RSAPublicKey public]
(let [e (.getPublicExponent public)
n (.getModulus public)]
{:kty "RSA"
:e (proto/bigint->b64str (proto/calc-byte-length e) e)
:n (proto/bigint->b64str (proto/calc-byte-length n) n)}))
(defmethod proto/jwk RSAPrivateKey
[^RSAPrivateKey private ^RSAPublicKey public]
(let [d (.getPrivateExponent private)
n (.getModulus private)
e (.getPublicExponent public)
;; Use public modulus to calculate byte length
l (proto/calc-byte-length n)]
{:kty "RSA"
:e (proto/bigint->b64str (proto/calc-byte-length e) e)
:n (proto/bigint->b64str l n)
:d (proto/bigint->b64str l d)}))
;; https://tools.ietf.org/html/rfc7638#section-3.1
(defmethod proto/thumbprint "RSA"
[jwk]
(let [w (StringWriter.)
jg ^JsonGenerator (json/create-generator w)]
(doto jg
(.writeStartObject)
(.writeStringField "e" (:e jwk))
(.writeStringField "kty" (:kty jwk))
(.writeStringField "n" (:n jwk))
(.writeEndObject)
(.flush))
(hash/sha256 (str w))))