```markdown


OneCard - Government Document Verification with Zero-Knowledge Proof

OneCard is a Node.js package that allows the verification of multiple government-issued documents and generates a unique hashified code that can be used for validation on other platforms using Zero-Knowledge Proof (ZKP). The hashified code contains details such as the user's age and the verified documents, ensuring privacy by not disclosing any sensitive data.

Features

- Document Verification: Verify the following government-issued documents:

- Aadhaar
- PAN
- Passport
- Voter ID
- Driving License
- Ration Card
- Birth Certificate

- Admin-Only Verification: Only admins can verify documents using a password.

- Zero-Knowledge Proof (ZKP): Generates a unique hashified code that can be shared with third parties for validation of the user’s age and verified documents, without disclosing the actual documents.

- Encryption: Uses AES-256-CBC encryption to generate a hashified code. The code can be decrypted to retrieve the verified data.

Installation

To install the package from NPM, use the following command:

`bash
npm install one-card
`
``

Usage

$3

To get started, import the OneCard class into your project:

`javascript
const OneCard = require("one-card");
`

$3

Create a new OneCard instance with the required documents and date of birth (DOB):

`javascript
const card = new OneCard({
aadhar: "AadhaarNumber",
pan: "PANNumber",
passport: "PassportNumber",
voter: "VoterID",
drivingLicense: "DrivingLicenseNumber",
ration: "RationCardNumber",
birthCertificate: "BirthCertificateNumber",
dob: "DateOfBirth",
});
`

$3

Admins can authenticate by providing the correct password from the environment file:

`javascript
card.signin("your-admin-password");
`

$3

Once logged in as an admin, you can verify documents using the following methods:

`javascript
card.verifyAadhar(); // Verify Aadhaar
card.verifyPan(); // Verify PAN
card.verifyPassport(); // Verify Passport
card.verifyVoter(); // Verify Voter ID
card.verifyDrivingLicense(); // Verify Driving License
card.verifyRation(); // Verify Ration Card
card.verifyBirthCertificate(); // Verify Birth Certificate
`

$3

You can get the user's age by calling the getAge() method:

`javascript
const age = card.getAge();
console.log("User's Age:", age);
`

$3

After verifying documents, generate a hashified code that contains the age and document verification status:

`javascript
const uniqueCode = card.hashify();
console.log("Unique Hashified Code:", uniqueCode);
`

$3

You can decrypt the hashified code to retrieve the original verified data:

`javascript
const decryptedData = card.decrypt(uniqueCode);
console.log("Decrypted Data:", decryptedData);
`

$3

You can check whether specific documents are verified using the respective methods:

`javascript
const isAadharVerified = card.isAadharVerified();
const isPanVerified = card.isPanVerified();
// Check other documents similarly...
``

Zero-Knowledge Proof (ZKP)

The generated hashified code can be shared with third parties to prove that a user’s documents have been verified and to validate their age. The unique code ensures privacy by revealing only the necessary information without exposing sensitive document details.