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Security infrastructure used in greetgo!

There is a newer version: 0.0.12

package kz.greetgo.security.crypto;

import java.security.SecureRandom;

/**
 * 
 * Encrypt and decrypt data. Sign and verify signature of data. Random generation.
 * 
 * 
 * Key pair will generate automatically and saved into key storage on first using
 * 
 * 
 * To create implementation use {@link CryptoBuilder}
 * 
 */
public interface Crypto {
  /**
   * Encrypt data using public key
   *
   * @param bytes data to encrypt
   * @return entrypted data
   */
  byte[] encrypt(byte[] bytes);

  /**
   * Decrypt encrypted data using private key
   *
   * @param encryptedBytes encrypted data
   * @return decrypted (original) data
   */
  byte[] decrypt(byte[] encryptedBytes);

  /**
   * Sign data
   *
   * @param bytes the data to sign
   * @return signature
   */
  byte[] sign(byte[] bytes);

  /**
   * Verifies signature
   *
   * @param bytes     checking data
   * @param signature verifying signature
   * @return verification result: true - verification is OK, otherwise - verification wrong
   */
  boolean verifySignature(byte[] bytes, byte[] signature);

  /**
   * Gives security random generator
   *
   * @return security random generator
   */
  SecureRandom rnd();
}