Function decryptUserPasswordRc4_40

decryptUserPasswordRc4_40(
ownerPw: ByteArray,
ownerKey: ByteArray,
): Promise<ByteArray>
Decrypts the user password from the /O value using RC4-40. Used to recover the user password when the owner password is known.
Parameters
- ownerPw: ByteArray
  The owner password.
- ownerKey: ByteArray
  The /O value from the encryption dictionary.
Returns Promise<ByteArray>
A promise that resolves to the decrypted user password (with padding removed).
Example
```
const userPassword = await decryptUserPasswordRc4_40(ownerPw, O)
```
- Defined in packages/pdf-lite/src/crypto/key-gen/key-gen-rc4-40.ts:36