Removing buffer.

Author: armfazh

examples/partially_blindrsa.ts

@@ -1,16 +1,22 @@
 // Copyright (c) 2024 Cloudflare, Inc.
 // Licensed under the Apache-2.0 license found in the LICENSE file or at https://opensource.org/licenses/Apache-2.0
 import sjcl from 'sjcl';
-import { Buffer } from 'node:buffer';
 import { generatePrimeSync } from 'node:crypto';
 
 import type { PartiallyBlindRSA } from '../src/index.js';
 
-function hexNumToB64URL(x: string): string {
+export function hexToUint8(x: string): Uint8Array {
     if (x.startsWith('0x')) {
-        x = x.slice(2);
+        x = x.substring(2);
     }
-    return Buffer.from(x, 'hex').toString('base64url');
+    return Uint8Array.from({ length: Math.floor(x.length / 2) }, (_, i) =>
+        parseInt(x.substring(2 * i, 2 * i + 2), 16),
+    );
+}
+
+function hexNumToB64URL(x: string): string {
+    const s = btoa(String.fromCharCode(...hexToUint8(x)));
+    return s.replace(/\+/g, '-').replace(/\//g, '_');
 }
 
 async function preGeneratedKeys(extractable = true): Promise<CryptoKeyPair> {

test/conv.ts

@@ -1,19 +1,22 @@
-import { Buffer } from 'node:buffer';
-
-export function hexNumToB64URL(x: string): string {
-    if (x.startsWith('0x')) {
-        x = x.slice(2);
-    }
-    return Buffer.from(x, 'hex').toString('base64url');
-}
-
 export function hexToUint8(x: string): Uint8Array {
     if (x.startsWith('0x')) {
-        x = x.slice(2);
+        x = x.substring(2);
     }
-    return new Uint8Array(Buffer.from(x, 'hex'));
+    return Uint8Array.from({ length: Math.floor(x.length / 2) }, (_, i) =>
+        parseInt(x.substring(2 * i, 2 * i + 2), 16),
+    );
 }
 
 export function uint8ToHex(x: Uint8Array): string {
-    return Buffer.from(x).toString('hex');
+    return Array.from(x)
+        .map((b) => b.toString(16).padStart(2, '0'))
+        .join('');
+}
+
+function b64ToB64URL(s: string) {
+    return s.replace(/\+/g, '-').replace(/\//g, '_');
+}
+
+export function hexNumToB64URL(x: string): string {
+    return b64ToB64URL(btoa(String.fromCharCode(...hexToUint8(x))));
 }