TRON’s signature algorithm is ECDSA, and the selected curve is SECP256K1.

From version 0.1.3, trident-java has implemented a wrapper class for SECP256K1.KeyPair in Core to facilitate the generation of private keys and the conversion of private keys to addresses. This classpath is: org.tron.trident.core.key.KeyPair;

Generate KeyPair

KeyPair keyPair = KeyPair.generate();

Import KeyPair with private key

KeyPair keyPair = new KeyPair("your private key");

Print Private & Public key

keyPair.toPrivateKey(); //String private key

keyPair.toPublicKey(); //String public key

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Note
The public key does not equal to address.

Print Base58Check & Hex address

keyPair.toBase58CheckAddress();

keyPair.toHexAddress();

Use a specific public key to convert to byte[], Base58Check or Hex address

//the parent function, returns byte[]
KeyPair.publicKeyToAddress(SECP256K1.PublicKey pubKey); 
  
KeyPair.publicKeyToBase58CheckAddress(SECP256K1.PublicKey pubKey);
  
KeyPair.publicKeyToHexAddress(SECP256K1.PublicKey pubKey);

Sign

//this function returns the signature message in byte[]
KeyPair.signTransaction(byte[] txid, KeyPair keyPair);