Unicode C++

Ed25519 Sign and Verify

See more Ed25519 Examples

Demonstrates how to create an Ed25519 signature, and then to verify it.

Note: This example requires Chilkat v9.5.0.83 or greater.

Unicode C++

#include <CkPrivateKeyW.h>
#include <CkBinDataW.h>
#include <CkEdDSAW.h>
#include <CkPublicKeyW.h>

void ChilkatSample(void)
    {
    bool success = false;

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    const wchar_t *privKeyHex = L"1498b5467a63dffa2dc9d9e069caf075d16fc33fdd4c3b01bfadae6433767d93";
    const wchar_t *pubKeyHex = L"b7a3c12dc0c8c748ab07525b701122b88bd78f600c76342d27f25e5f92444cde";

    CkPrivateKeyW privKey;
    // This example shows only one way of loading an Ed25519 private key.
    // Chilkat can load other formats (JWK, PEM, ASN.1 DER, etc.)  
    // You may do so by calling LoadAnyFormat or LoadAnyFormatFile.
    success = privKey.LoadEd25519(privKeyHex,pubKeyHex);
    if (success == false) {
        wprintf(L"%s\n",privKey.lastErrorText());
        return;
    }

    // The data to be signed...
    CkBinDataW bd;
    bd.AppendString(L"Message for Ed25519 signing",L"utf-8");

    CkEdDSAW eddsa;
    const wchar_t *hexSig = eddsa.signBdENC(bd,L"hexlower",privKey);

    wprintf(L"signature = %s\n",hexSig);

    // The expected output is: 6dd355667fae4eb43c6e0ab92e870edb2de0a88cae12dbd8591507f584fe4912babff497f1b8edf9567d2483d54ddc6459bea7855281b7a246a609e3001a4e08

    // Verify the signature..
    CkPublicKeyW pubKey;
    success = pubKey.LoadEd25519(pubKeyHex);
    if (success == false) {
        wprintf(L"%s\n",pubKey.lastErrorText());
        return;
    }

    bool bVerified = eddsa.VerifyBdENC(bd,hexSig,L"hexlower",pubKey);
    if (bVerified == false) {
        wprintf(L"%s\n",eddsa.lastErrorText());
        wprintf(L"Failed to verify the signature.\n");
        return;
    }

    wprintf(L"The Ed25519 signature is verified!\n");
    }