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(C#) 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.
// 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"; Chilkat.PrivateKey privKey = new Chilkat.PrivateKey(); bool success = privKey.LoadEd25519(privKeyHex,pubKeyHex); if (success == false) { Debug.WriteLine(privKey.LastErrorText); return; } // The data to be signed... Chilkat.BinData bd = new Chilkat.BinData(); bd.AppendEncoded("616263","hex"); Chilkat.EdDSA eddsa = new Chilkat.EdDSA(); // Indicate we want the Ed25519ph instance. eddsa.Algorithm = "Ed25519ph"; string hexSig = eddsa.SignBdENC(bd,"hexlower",privKey); Debug.WriteLine("signature = " + hexSig); // The expected output is: 98a70222f0b8121aa9d30f813d683f80.... // Verify the signature.. Chilkat.PublicKey pubKey = new Chilkat.PublicKey(); success = pubKey.LoadEd25519(pubKeyHex); if (success == false) { Debug.WriteLine(pubKey.LastErrorText); return; } bool bVerified = eddsa.VerifyBdENC(bd,hexSig,"hexlower",pubKey); if (bVerified == false) { Debug.WriteLine(eddsa.LastErrorText); Debug.WriteLine("Failed to verify the signature."); return; } Debug.WriteLine("The Ed25519ph signature is verified!"); |
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