Feat: Convert speck32_64ecb to TypeScript

Co-authored-by: gemini-3.7-flash <noreply@google.com>

speck32_64ecb.ts

@@ -0,0 +1,25 @@
+import speck from 'generic-speck';
+import { blake2bHex } from 'blakejs';
+
+const speck32_64 = speck();
+
+export function getKey(kStr: string): number[] {
+    const key64bit = blake2bHex(kStr, undefined, 8);
+    return [
+        parseInt(key64bit.slice(0, 4), 16),
+        parseInt(key64bit.slice(4, 8), 16),
+        parseInt(key64bit.slice(8, 12), 16),
+        parseInt(key64bit.slice(12, 16), 16)
+    ];
+}
+
+export function encrypt(ptStr: string, key: number[]): number[] {
+    return Array.from(ptStr, c => speck32_64.encrypt(c.codePointAt(0)!, key));
+}
+
+export function decrypt(numArr: number[], key: number[]): string {
+    return numArr.map(x => {
+        try { return String.fromCodePoint(speck32_64.decrypt(x, key)); }
+        catch { return ''; }
+    }).join('');
+}