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    1   package org.bouncycastle.crypto;
    2   
    3   import java.security.SecureRandom;
    4   
    5   /**
    6    * The base class for symmetric, or secret, cipher key generators.
    7    */
    8   public class CipherKeyGenerator
    9   {
   10       protected SecureRandom  random;
   11       protected int           strength;
   12   
   13       /**
   14        * initialise the key generator.
   15        *
   16        * @param param the parameters to be used for key generation
   17        */
   18       public void init(
   19           KeyGenerationParameters param)
   20       {
   21           this.random = param.getRandom();
   22           this.strength = (param.getStrength() + 7) / 8;
   23       }
   24   
   25       /**
   26        * generate a secret key.
   27        *
   28        * @return a byte array containing the key value.
   29        */
   30       public byte[] generateKey()
   31       {
   32           byte[]  key = new byte[strength];
   33   
   34           random.nextBytes(key);
   35   
   36           return key;
   37       }
   38   }

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