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(Java) Ed25519ph Sign and VerifyDemonstrates how to create an Ed25519ph signature, and then to verify it. Note: This example requires Chilkat v9.5.0.91 or greater.
import com.chilkatsoft.*; public class ChilkatExample { static { try { System.loadLibrary("chilkat"); } catch (UnsatisfiedLinkError e) { System.err.println("Native code library failed to load.\n" + e); System.exit(1); } } public static void main(String argv[]) { // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // Use the following test vector from https://www.rfc-editor.org/rfc/rfc8032#page-30 // -----TEST abc // // ALGORITHM: // Ed25519ph // // SECRET KEY: // 833fe62409237b9d62ec77587520911e // 9a759cec1d19755b7da901b96dca3d42 // // PUBLIC KEY: // ec172b93ad5e563bf4932c70e1245034 // c35467ef2efd4d64ebf819683467e2bf // // MESSAGE (length 3 bytes): // 616263 // // SIGNATURE: // 98a70222f0b8121aa9d30f813d683f80 // 9e462b469c7ff87639499bb94e6dae41 // 31f85042463c2a355a2003d062adf5aa // a10b8c61e636062aaad11c2a26083406 String privKeyHex = "833fe62409237b9d62ec77587520911e9a759cec1d19755b7da901b96dca3d42"; String pubKeyHex = "ec172b93ad5e563bf4932c70e1245034c35467ef2efd4d64ebf819683467e2bf"; CkPrivateKey privKey = new CkPrivateKey(); boolean success = privKey.LoadEd25519(privKeyHex,pubKeyHex); if (success == false) { System.out.println(privKey.lastErrorText()); return; } // The data to be signed... CkBinData bd = new CkBinData(); bd.AppendEncoded("616263","hex"); CkEdDSA eddsa = new CkEdDSA(); // Indicate we want the Ed25519ph instance. eddsa.put_Algorithm("Ed25519ph"); String hexSig = eddsa.signBdENC(bd,"hexlower",privKey); System.out.println("signature = " + hexSig); // The expected output is: 98a70222f0b8121aa9d30f813d683f80.... // Verify the signature.. CkPublicKey pubKey = new CkPublicKey(); success = pubKey.LoadEd25519(pubKeyHex); if (success == false) { System.out.println(pubKey.lastErrorText()); return; } boolean bVerified = eddsa.VerifyBdENC(bd,hexSig,"hexlower",pubKey); if (bVerified == false) { System.out.println(eddsa.lastErrorText()); System.out.println("Failed to verify the signature."); return; } System.out.println("The Ed25519ph signature is verified!"); } } |
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