sz Posts - Deno

•Created by sz on 1/3/2024 in #help

`RangeError: Offset is outside the bounds of the DataView` when trying to encrypt with AES-CRT

Hi, I'm trying to encrypt some files with aes128-crt, but I always get the error below. (Even if I just pass some random short string converted into an uint8array instead of the file's content) stacktrace:

RangeError: Offset is outside the bounds of the DataView
    at DataView.getUint32 (<anonymous>)
    at Ctr.encrypt (https://deno.land/x/crypto@v0.10.1/src/block-modes/ctr.ts:36:25)
    at Builder.EncodeFile (file:///C:/redacted/builders/Shared.ts:42:34)

RangeError: Offset is outside the bounds of the DataView
    at DataView.getUint32 (<anonymous>)
    at Ctr.encrypt (https://deno.land/x/crypto@v0.10.1/src/block-modes/ctr.ts:36:25)
    at Builder.EncodeFile (file:///C:/redacted/builders/Shared.ts:42:34)

code snippet:

import crypto from "node:crypto";
import { Aes } from "https://deno.land/x/crypto/aes.ts";
import { Ctr } from "https://deno.land/x/crypto/block-modes.ts";

// ...
class Builder {
  // ...

  protected EncodeFile(
    FileSource: string,
    FileTarget: string,
    UsedKey?: Uint8Array,
    UsedIVKey?: Uint8Array,
  ): { Key: string; Iv: string } {
    const Key = UsedKey ?? new Uint8Array(16),
      IVKey = UsedIVKey ?? new Uint8Array(16);

    const Encoder = new TextEncoder();
    const FileContent = Encoder.encode(fs.readFileSync(FileSource, "utf-8"));

    // Create an AES-128-CTR cipher
    const Cipher = new Ctr(Aes, Key, IVKey);

    // Encrypt the data
    const EncryptedData = Cipher.encrypt(FileContent);

    WriteFile(FileTarget, EncryptedData, "utf-8");
    return { Key: this.UInt8ArrayToHex(Key), Iv: this.UInt8ArrayToHex(IVKey) };
  }
}

import crypto from "node:crypto";
import { Aes } from "https://deno.land/x/crypto/aes.ts";
import { Ctr } from "https://deno.land/x/crypto/block-modes.ts";

// ...
class Builder {
  // ...

  protected EncodeFile(
    FileSource: string,
    FileTarget: string,
    UsedKey?: Uint8Array,
    UsedIVKey?: Uint8Array,
  ): { Key: string; Iv: string } {
    const Key = UsedKey ?? new Uint8Array(16),
      IVKey = UsedIVKey ?? new Uint8Array(16);

    const Encoder = new TextEncoder();
    const FileContent = Encoder.encode(fs.readFileSync(FileSource, "utf-8"));

    // Create an AES-128-CTR cipher
    const Cipher = new Ctr(Aes, Key, IVKey);

    // Encrypt the data
    const EncryptedData = Cipher.encrypt(FileContent);

    WriteFile(FileTarget, EncryptedData, "utf-8");
    return { Key: this.UInt8ArrayToHex(Key), Iv: this.UInt8ArrayToHex(IVKey) };
  }
}

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