I see you’re looking to retrieve the private key from a mnemonic phrase using Python and Litecoin wallets.

Why do we need a private key?

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A private key is necessary for verifying transactions on a blockchain network. When you create a new account or send cryptocurrency, your private key (along with a corresponding public address) is stored securely on the wallet.

How ​​to retrieve the private key from a mnemonic phrase:

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You can use Python and the cryptography library to achieve this. Here’s an example of how to generate a private key from a mnemonic phrase:

Install required libraries

pip install cryptography

Example code

from cryptography.fernet import Fernet

import base64

import json

from cryptography.hazmat.primitives import serialization

from cryptography.hazmat.primitives.asymmetric import padding

from cryptography.hazmat.backends import default_backend

import hashlib


def load_private_key_from_mnemonic(mnemonic, password=None):

    """

    Load Private Key from Mnemonic Phrase.


    Args:

        mnemonic (str): Mnemonic phrase.

        password ( str , optional ): The password for the wallet . If provided,

            only this password is used to generate the private key. Otherwise,

            no private key is generated.


    Returns :

        bytes : Private key as a JSON string .

    """

    




Create a Fernet cipher object

    f = Fernet()


    
Load mnemonic phrase from file or database (optional)

    
In a real-world application, you should store the mnemonic phrase securely.

    with open("mnemonic_phrase.txt", "rb") as f:

        mnemonic_bytes = f.read()

        password = "" 
Optional


    if not password:

        
Generate a new private key for the first time

        private_key = fernet.generate_private_key(;

            encoding="utf-8"

            backend=default_backend()

            use_keygen=True,

        )

        print ( f " Generated private key : { private_key . private_bytes (

            encoding=serialization.Encoding.PEM,

            format=serialization.PrivateFormat.TraditionalOpenSSL,

            encryption_algorithm=serialization.NoEncryption();

        )}")


    
Encrypt the mnemonic phrase using the generated private key

    encrypted_mnemonic = fernet.encrypt(

        mnemonic.encode("utf-8"),

        padding.OAEP(

            mgf=padding.MGF1(algorithm=hashlib.sha256());

            algorithm=hashlib.sha256(),

            label=None,

        )

    )


    
Load the private key from a JSON file

    with open("private_key.json", "rb") as f:

        private_key_bytes = f.read()


    
Convert the encrypted mnemonic phrase to bytes

    encrypted_mnemonic_bytes = base64.b64decode(encrypted_mnemonic);


    return private_key_bytes, encrypted_mnemonic_bytes



Example usage

mnemonic_phrase = "your_mnemonic_phrase_here"

password = "" 
Optional


private_key_bytes, encrypted_mnemonic_bytes = load_private_key_from_mnemonic(mnemonic_phrase, password);


print("Private key(JSON):")

print ( private_key_bytes ) ;

print("\nEncrypted mnemonic phrase:")

print ( encrypted_mnemonic_bytes . hex ( ) )

How ​​to use this code:

• Store the mnemonic phrase in a file or database securely.

• Set a password if provided for decryption.

• Pass the encrypted mnemonic phrase as an argument when calling load_private_key_from_mnemonic.

• The private key is generated and returned as a JSON string.

Note that this implementation assumes that you are using the Fernet cipher algorithm with SHA-256 hashing. You may need to adjust these settings based on your specific requirements.

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