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system/node_modules/aes-js/src.ts/mode-ecb.ts

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+// Electronic Code Book
+
+import { ModeOfOperation } from "./mode.js";
+
+export class ECB extends ModeOfOperation {
+
+  constructor(key: Uint8Array) {
+    super("ECB", key, ECB);
+  }
+
+  encrypt(plaintext: Uint8Array): Uint8Array {
+    if (plaintext.length % 16) {
+        throw new TypeError("invalid plaintext size (must be multiple of 16 bytes)");
+    }
+
+    const crypttext = new Uint8Array(plaintext.length);
+    for (let i = 0; i < plaintext.length; i += 16) {
+        crypttext.set(this.aes.encrypt(plaintext.subarray(i, i + 16)), i);
+    }
+
+    return crypttext;
+  }
+
+  decrypt(crypttext: Uint8Array): Uint8Array {
+    if (crypttext.length % 16) {
+        throw new TypeError("invalid ciphertext size (must be multiple of 16 bytes)");
+    }
+
+    const plaintext = new Uint8Array(crypttext.length);
+    for (let i = 0; i < crypttext.length; i += 16) {
+        plaintext.set(this.aes.decrypt(crypttext.subarray(i, i + 16)), i);
+    }
+
+    return plaintext;
+  }
+}