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cryptolib

a small library to easily encrypt/decrypt with RSA public/private key pair.

how to:

Generate the key pair:

openssl genrsa -out private.pem 2048
openssl rsa -in private.pem -out public.pem -pubout -outform PEM

Install cryptolib

git clone https://github.com/vspaz/rsa-encrypt-decrypt-python.git
cd rsa-encrypt-decrypt-python

pip3 install .
from cryptolib import serializers


def encrypt_message(message_to_encrypt: str) -> bytes:
    public_key = """-----BEGIN PUBLIC KEY-----
    MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAxGDcSAjiHKP9v2ITR+Bj
    Qmt9Tx2zW08ZyrjOxPew+Gxl2m5zJyoP8sicZV81BeMNFkMg6q7sMtRXHhX1nFiT
    ql5HBIqhZohYlN3LIXK2bdPWpDttrOFXfsSbZ4Wqy3XhXBhiPNn3kkkRv1N5L/IY
    cdrxwqaqvTlJzOeQnDsd3+AmkYstuD4rgElOFkcUawtF7lKIYYFi42cYkJo51UD4
    60mYieBezP6dZhFZB56pZ2rV8cQUNrUQy2llpj+PxX/yhGnYI88ij0FST0gI2l4U
    sjtwXVB1Y2SxqrhNMdBU7W6ZA8WUQQidr4MBxEFoujsLjaCl8LMsbEpAAilKezwu
    bQIDAQAB
    -----END PUBLIC KEY-----
    """

    encoder = serializers.Encoder(public_key=public_key)
    encrypted_message = encoder.encrypt(unencrypted_text=message_to_encrypt)
    return encoder.to_base_85(serializable=encrypted_message)


def decrypt_message(message_to_decrypt: bytes) -> str:
    private_key = """-----BEGIN RSA PRIVATE KEY-----
    MIIEowIBAAKCAQEAxGDcSAjiHKP9v2ITR+BjQmt9Tx2zW08ZyrjOxPew+Gxl2m5z
    JyoP8sicZV81BeMNFkMg6q7sMtRXHhX1nFiTql5HBIqhZohYlN3LIXK2bdPWpDtt
    rOFXfsSbZ4Wqy3XhXBhiPNn3kkkRv1N5L/IYcdrxwqaqvTlJzOeQnDsd3+AmkYst
    uD4rgElOFkcUawtF7lKIYYFi42cYkJo51UD460mYieBezP6dZhFZB56pZ2rV8cQU
    NrUQy2llpj+PxX/yhGnYI88ij0FST0gI2l4UsjtwXVB1Y2SxqrhNMdBU7W6ZA8WU
    QQidr4MBxEFoujsLjaCl8LMsbEpAAilKezwubQIDAQABAoIBAFgkwbrzgcopMXP9
    qXnRlbvyU0R3qFGLp5/+Y5C1PJHE1dK9UKJ7lrz6nnhBy6Lgzrb3Wob8DLij5pZy
    dNPATkdiGa5IKznCaUAobUyOGKQjOWxt4ESAwKz9wmMs9ARu3MBhkXaOvzjB411l
    Mjf7Ck3QYENmW6yjUiTOq3H0duxM/rn1Y88a9z2+aoWXQTltWvu0qKfb8SsqKzzx
    HQFSalgNUxIqs+NoHRAT4ygzGGgipdP2/gXA966UonYuFAkpkutCeKVd7/6dMbm8
    bgnr/x6ivGeLkbIaVkHNPRU+P4SYX1/XZohYIkTbggIih2aeH6+lEka8yZURANI6
    HSUwLAECgYEA4bfavKu12NiIUO75/ZcqF8ojXq5+7HXP59t5X5MrURj2jizWs8YH
    vPdrvYqxQNMZ0U0ZQBdAUWCn0Z11OXEak7YpKP78yoLIw2YnhgLVFvp3xZ+pIjjN
    yidWbIvoq8SLMiUYHrMy3lMwVyFjM/AuA6bqNffCbHXqs9Ut+WnDN6ECgYEA3rlZ
    S1gnE0sJrAJQ/5FnKgY/+TP6p+/k1SmRahNxYqpdP2t4CSwtYvjExRYcZefWFV1V
    G04KvFuKf4p9zasYnISvWV735KU++li/QEw0LrVzXcnoRXiZwXauQzYQI6tuMYmc
    NQRGBma3R7lQ/93YV3+hdubG+VCUsAC/B42zk00CgYAJ8zngQU2F3p27u50nkadY
    Xx/KB7UupU7h8KncDbfGHmyX/eAFEsC6ksmcFGYV7nhf4p8vVRcPv0wGkINfYd4D
    Du+nj/4Cy1sgSfuKC8vq9GWdP5mMGabwt2U26b/6+nIMZtg2Wj3u0Qn7fUxLONY+
    cPg4ItDeSSBshwQ8z228oQKBgGyXL/s1OrAEaO3Nn1JLwWHS9EP7XN2ecBKiFr0C
    R8kUSSyPqFHIkURtB/sTobrpww5dmA4dCcz2UNuIWXf6UKCXbKsFS5XWH5ONy4l8
    3gBcBaiXtcCRYV3bEHHCnTHW9n3+mwOaVs3uLLQynVRzBHT8zGudbyvFZwk9A+aZ
    5xENAoGBALO842ymiZmFYiv9CIdfBGFokbokQMci+4cJm4wWzxEiDjAzSglRHAei
    /+oGBiPm8mKmx/dcU408x4PK76JlfduuoXuzE9jEmx46kwU4jGDS1GZYkwjGVPY8
    8UmZ7fFkjNFJH0Rh5y+tmoFyou3FsWzL2lpd1mIryAH2LR3PGE/t
    -----END RSA PRIVATE KEY-----"""

    decoder = serializers.Decoder(private_key=private_key)
    base85_decoded_message = decoder.from_base_85(deserializable=message_to_decrypt)
    return decoder.decrypt(encrypted_text=base85_decoded_message).decode()


def main():
    initial_message = "some text goes here"
    encrypted_message = encrypt_message(message_to_encrypt=initial_message)
    decrypted_message = decrypt_message(message_to_decrypt=encrypted_message)
    assert decrypted_message == initial_message


if __name__ == "__main__":
    main()

NOTE: please refer to: