feat: add (rsa)pubKey.encrypt and (rsa)privKey.decrypt

nodeJS only for now

src/keys/rsa-browser.js

@@ -115,3 +115,11 @@ function derivePublicFromPrivate (jwKey) {
     ['verify']
   )
 }
+
+exports.encrypt = function (key, bytes, cb) {
+  return cb(new Error('rsa.pubKey.encrypt() not yet implemented in the browser! (PRs welcome: https://github.com/libp2p/js-libp2p-crypto)'))
+}
+
+exports.decrypt = function (key, bytes, cb) {
+  return cb(new Error('rsa.privKey.decrypt() not yet implemented in the browser! (PRs welcome: https://github.com/libp2p/js-libp2p-crypto)'))
+}

src/keys/rsa-class.js

@@ -30,8 +30,8 @@ class RsaPublicKey {
     })
   }
 
-  encrypt (bytes) {
-    return this._key.encrypt(bytes, 'RSAES-PKCS1-V1_5')
+  encrypt (bytes, cb) {
+    crypto.encrypt(this._key, bytes, cb)
   }
 
   equals (key) {
@@ -69,8 +69,8 @@ class RsaPrivateKey {
     return new RsaPublicKey(this._publicKey)
   }
 
-  decrypt (msg, callback) {
-    crypto.decrypt(this._key, msg, callback)
+  decrypt (bytes, cb) {
+    crypto.decrypt(this._key, bytes, cb)
   }
 
   marshal () {

src/keys/rsa.js

@@ -77,3 +77,27 @@ exports.hashAndVerify = function (key, sig, msg, callback) {
     callback(null, result)
   })
 }
+
+exports.encrypt = function (key, bytes, cb) {
+  let res
+
+  try {
+    res = crypto.publicEncrypt(jwkToPem(key), bytes)
+  } catch (err) {
+    return cb(err)
+  }
+
+  return cb(null, res)
+}
+
+exports.decrypt = function (key, bytes, cb) {
+  let res
+
+  try {
+    res = crypto.privateDecrypt(jwkToPem(key), bytes)
+  } catch (err) {
+    return cb(err)
+  }
+
+  return cb(null, res)
+}