CBC encrypt and decrypt is wrong on output

[RaresAil]

  public encrypt(data: string) {
    return Buffer.from(
      this.CBC.encrypt(padding.pkcs7.pad(utils.utf8.toBytes(data)))
    ).toString('base64');
  }

  public decrypt(data: string) {
    return Buffer.from(
      padding.pkcs7.strip(this.CBC.decrypt(Buffer.from(data, 'base64')))
    ).toString('utf-8');
  }

As a test i did a encrypt and then a decrypt and the output is like:

Expected input

'{"method":"login_device","params":{...

Real output:

'��mWL�u�i\x14��-�pK_device","params":{

The rest of the string json (at ....) is good, only the first 16 characters are not

[brandtiwari007]

Hi @RaresAil have you got solution for this

[RaresAil]

@brandtiwari007 Yes, i used NodeJS's Crypto library:

https://github.com/RaresAil/homebridge-tplink-smart-light/blob/a6a45d4e248fbe635c99f489a00962804f482159/src/api/TpLinkCipher.ts#L53

[webdevelopland]

16 characters is one block. Probably it's related to iv. I guess you used different iv for encryption and decryption.