Class to encrypt/decrypt with RSA Public/Private Keys

I need a class to store protected data with RSA key pair: Admin user to create the first user: - Generate pass encryption key protected by the hash of the user password (per user) - Generate data encryption pass - Store the data encryption pass encrypted with the pass encryption key of the user - Generate the data encription key protected by the data encryption pass Create aditional users: - Admin has to retrieve the data encryption pass (needs to be decrypted from the database) - User to be inserted into the database with a hash of the temporary password that will be changed in the first login - Generate pass encryption key protected by the temporary password - Store the data encryption pass encrypted with the pass encryption key of the user Change the password: - Decrypt the data encryption pass - Generate new pass encryption key protected by the hash of the new user password - Encrypt the data encryption pass with the new pass encryption key Inserting data - Encrypt the data with the data encription key Retrieving data: - Decrypt the data encryption pass - Decrypt the data Everything should be commented, and easy to identify