CardEncryptor is a Python class that replicates the encryption mechanism of FirstData V1 using single-line public keys. It securely encrypts credit card data for safe transmission, ensuring compliance with high-security standards.

• Single-Line Public Key: Supports public keys in single-line format, converting them to PEM format automatically.

• Secure Encryption: Utilizes RSA encryption with OAEP padding and SHA-256 hashing.

• Metadata Generation: Includes field length metadata for added validation.

• Ease of Use: Minimal setup required; simply pass your public key and card data.

import base64
from Crypto.PublicKey import RSA
from Crypto.Cipher import PKCS1_OAEP
from Crypto.Hash import SHA256
import logging

# Initialize the payload
payload = {
    "pk": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAxU0Lvv1kDJsu3zH8hHe2bB14r3pDzeLR5/WUG54Ftpp9PHDwIjrjWRMSYYO0KhJP6R8/0dq5KGI7W01+Fk9O3omk8TI4hIZOlNZVXFVE9yfjB/hwp3pehWOGM7YJwMes1FCA/N23lV77l9zlJNYxAUdtY73KsBJhB6rBDDVTAIF7ko3xlbBKeZEqQH6NktS3k7YOYQ68mgvYuBts3GxpcBFRjelCzodK1turp/K9aK6NZCsMsq0tt4YcYiEpCVCzzYMhZ7R62/e8WBVT825QmxZq6TIjbuD/mSgBH/zePMgfIbnW8HuZVZu8WbZTOFowj2JBv9LjHnvR2O9nzcOS0QIDAQAB",
    "data": {
        "card": "4111111111111111",
        "cvv": "123",
        "exp": "0125",
        "name": "John Doe"
    }
}

# Initialize the encryptor
encryptor = CardEncryptor()

try:
    result = encryptor.encrypt_card_data(payload)
    encrypted_block = result['encryptedCard']['encryption_block']
    fields = result['encryptedCard']['encryption_block_fields']
    print(f"\ud83d\udd10 Encrypted Block: {encrypted_block}\n\ud83d\udcca Metadata: {fields}")
except ValueError as e:
    print(f"Encryption Failed: {str(e)}")

1. Clone the Repository:

   git clone https://github.com/your-repo/CardEncryptor.git

2. Install Dependencies:

   pip install pycryptodome
   

Converts a single-line public key to PEM format and sets it for encryption.

• Parameters:

  • key_string: Public key in single-line format.

• Returns: True if the key is successfully set, False otherwise.

Encrypts credit card data using RSA and returns the encrypted block with metadata.

• Parameters:

  • payload: A dictionary containing pk (public key) and data (card details).

    • data fields:

      • card: Card number.

      • cvv: Security code (optional).

      • exp: Expiration date.

      • name: Cardholder name.

• Returns: A dictionary with the encrypted block and metadata.

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• Python 3.8+

• PyCryptodome

• RSA Encryption

This project is licensed under the MIT License - see the LICENSE file for details.