Detailed explanation of reading public and private keys for encryption and decryption under python

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Reading public and private keys for encryption and decryption under python.

In RSA, one application mode is public key encryption and private key decryption (the other is private key signature and public key signature verification). The following are application examples under Python.

Suppose I have a public key file, rsa_pub.pem, and I want to read this public key and use it to encrypt.

from M2Crypto import RSA,BIO

  fp = file('rsa_pub.pem','rb');
  pub_key_str = fp.read();
  fp.close();

  mb = BIO.MemoryBuffer(pub_key_str);
  pub_key = RSA.load_pub_key_bio(mb);

  data = '12345678';
  en_data = pub_key.public_encrypt(data,RSA.pkcs1_padding);

  ...

Private key file rsa_private.pem, read the private key and use it to decrypt

from M2Crypto import RSA,BIO

  private_key_str = file('rsa_private.pem','rb').read();
  private_key = RSA.load_key_string(private_key_str);
  data = 'sdfdjslfjaskldfjdsklfjsd';
  de_data = private_key.private_decrypt(data,RSA.pkcs1_padding);

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