Getting the Bytes of a Generated Symmetric Key : Key Generator « Security « Java Tutorial

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Java Tutorial » Security » Key Generator 
36. 21. 3. Getting the Bytes of a Generated Symmetric Key
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

public class Main {
  public static void main(String[] argvthrows Exception {
    // Generate a key
    KeyGenerator keyGen = KeyGenerator.getInstance("DESede");
    SecretKey key = keyGen.generateKey();

    // Get the bytes of the key
    byte[] keyBytes = key.getEncoded();
    int numBytes = keyBytes.length;

    // The bytes can be converted back to a SecretKey
    SecretKey key2 = new SecretKeySpec(keyBytes, "DESede");
    boolean b = key.equals(key2)// true
  }
}
36. 21. Key Generator
36. 21. 1. Key Generator Demo
36. 21. 2. Generating a Symmetric Key
36. 21. 3. Getting the Bytes of a Generated Symmetric Key
36. 21. 4. Generate a key for the HMAC-SHA1 keyed-hashing algorithm
36. 21. 5. Encryption and Decryption using Symmetric Keys
36. 21. 6. Get the bytes of the public and private keys
36. 21. 7. Get the formats of the encoded bytes
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