Add support for PSS RSA family of Signers

Author: AJCStriker

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "strontium",
-  "version": "2.6.5",
+  "version": "2.6.6",
   "description": "Strontium is a TypeScript toolkit for High Performance API servers built for Production not Projects.",
   "main": "lib/src/index.js",
   "types": "lib/src/index.d.ts",
@@ -68,7 +68,7 @@
     "base64url": "^3.0.0",
     "fastify": "^1.12.1",
     "inversify": "^5.0.1",
-    "jwa": "^1.1.6",
+    "jwa": "^1.2.0",
     "lodash": "^4.17.11",
     "mysql": "^2.16.0",
     "pg": "^7.5.0",

package.json

@@ -5,15 +5,23 @@ import { InvalidSignatureError } from "../../../errors/InvalidSignatureError"
 // @ts-ignore
 import * as JWA from "jwa"
 
-const RS256 = JWA("RS256")
-
 export class RSASHA256Signer extends AsymmetricSigner {
+    private signer = JWA(this.algorithm)
+
+    constructor(
+        public publicKey: Buffer,
+        public privateKey?: Buffer,
+        private algorithm: "RS256" | "PS256" = "RS256"
+    ) {
+        super(publicKey, privateKey)
+    }
+
     public async sign(plaintext: Buffer): Promise<Buffer> {
-        return RS256.sign(plaintext, this.privateKey)
+        return this.signer.sign(plaintext, this.privateKey)
     }
 
     public async verify(plaintext: Buffer, signature: Buffer): Promise<Buffer> {
-        let isValid = await RS256.verify(
+        let isValid = await this.signer.verify(
             plaintext,
             signature.toString(),
             this.publicKey