Add base64url encoding

src/utility/encode.ts

@@ -22,6 +22,20 @@ export class encode {
     return new RawBinary(Uint8Array.from(atob(data), (c) => c.charCodeAt(0)));
   }
 
+  static base64url(data: string) {
+    let input = data
+      .replace(/-/g, "+")
+      .replace(/_/g, "/");
+
+    const pad = input.length % 4;
+    if (pad) {
+      if (pad === 1) throw "Invalid length";
+      input += new Array(5 - pad).join("=");
+    }
+
+    return encode.base64(input);
+  }
+
   static binary(data: Uint8Array | number[]) {
     return new RawBinary(data);
   }

tests/rsa/rsa.verify.test.ts

@@ -0,0 +1,31 @@
+import {
+  assertEquals,
+} from "https://deno.land/[email protected]/testing/asserts.ts";
+import { RSA, encode } from "./../../mod.ts";
+
+Deno.test("Verify RSASSA-PKSC1-v1_5", async () => {
+  const publicKey = `-----BEGIN PUBLIC KEY-----
+    MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAnzyis1ZjfNB0bBgKFMSv
+    vkTtwlvBsaJq7S5wA+kzeVOVpVWwkWdVha4s38XM/pa/yr47av7+z3VTmvDRyAHc
+    aT92whREFpLv9cj5lTeJSibyr/Mrm/YtjCZVWgaOYIhwrXwKLqPr/11inWsAkfIy
+    tvHWTxZYEcXLgAXFuUuaS3uF9gEiNQwzGTU1v0FqkqTBr4B8nW3HCN47XUu0t8Y0
+    e+lf4s4OxQawWD79J9/5d3Ry0vbV3Am1FtGJiJvOwRsIfVChDpYStTcHTCMqtvWb
+    V6L11BWkpzGXSW4Hv43qa+GSYOD2QU68Mb59oSk2OB+BtOLpJofmbGEGgvmwyCI9
+    MwIDAQAB
+    -----END PUBLIC KEY-----`;
+
+  const key = RSA.parseKey(publicKey);
+  const rsa = new RSA(key);
+  let base64 =
+    "POstGetfAytaZS82wHcjoTyoqhMyxXiWdR7Nn7A29DNSl0EiXLdwJ6xC6AfgZWF1bOsS_TuYI3OG85AmiExREkrS6tDfTQ2B3WXlrr-wp5AokiRbz3_" +
+    "oB4OxG-W9KcEEbDRcZc0nH3L7LzYptiy1PtAylQGxHTWZXtGz4ht0bAecBgmpdgXMguEIcoqPJ1n3pIWk_dUZegpqx0Lka21H6XxUTxiy8OcaarA8zdn" +
+    "PUnV6AmNP3ecFawIFYdvJB_cm-GvpCSbr8G8y_Mllj8f4x9nBH8pQux89_6gUY618iYv7tuPWBFfEbLxtF2pZS6YC1aSfLQxeNe8djT9YjpvRZA";
+
+  const verified = await rsa.verify(
+    encode.base64url(base64),
+    "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiYWRtaW4iOnRydWUsImlhdCI6MTUxNjIzOTAyMn0",
+    { algorithm: "rsassa-pkcs1-v1_5", hash: "sha256" },
+  );
+
+  assertEquals(verified, true);
+});