Class KeyGenerator

java.lang.Object
com.codename1.security.KeyGenerator
public final class KeyGenerator extends Object

Generates fresh cryptographic key material. AES keys are pulled directly from SecureRandom; RSA key pairs are generated by the platform's native crypto provider.

Example
SecretKey aes = KeyGenerator.aes(256);   // AES-256
KeyPair   rsa = KeyGenerator.rsa(2048);  // RSA-2048
KeyPair   ec  = KeyGenerator.ec(256);    // P-256, for ECDSA and ECDH

  • Method Summary

    Modifier and Type
    Method
    Description
    static SecretKey
    aes(int bits)
    Generates a fresh AES key of the given bit length.
    static KeyPair
    ec(int bits)
    Generates a fresh elliptic-curve key pair on NIST P-256 (secp256r1), the curve every platform provider implements.
    static SecretKey
    hmac(int bits)
    Generates a fresh HMAC key of the given bit length.
    static KeyPair
    rsa(int bits)
    Generates a fresh RSA key pair of the given size in bits.

    Methods inherited from class Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Method Details

    • aes

      public static SecretKey aes(int bits)
      Generates a fresh AES key of the given bit length. Valid lengths are 128, 192 and 256 bits.

    • hmac

      public static SecretKey hmac(int bits)
      Generates a fresh HMAC key of the given bit length. By convention, HMAC keys should be at least as long as the hash output.

    • rsa

      public static KeyPair rsa(int bits)
      Generates a fresh RSA key pair of the given size in bits. 2048 is the modern minimum; 3072 / 4096 for higher security margins. Generating a 4096-bit RSA key can take several seconds -- call from a background thread.

    • ec

      public static KeyPair ec(int bits)

      Generates a fresh elliptic-curve key pair on NIST P-256 (secp256r1), the curve every platform provider implements. The pair signs with Signature.SHA256_WITH_ECDSA and agrees secrets with KeyAgreement.ecdh(PrivateKey, PublicKey).

      Parameters
      • bits: the curve size; only 256 is supported