(C++) Get an Ed25519 Key in Raw Hex Format

Demonstrates how to get the private and public key parts of an Ed25519 key in lowercase hex formmat.

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

Chilkat C/C++ Library Downloads
MS Visual C/C++ C++ Builder Linux C/C++ Alpine Linux C/C++	MacOS C/C++ iOS C/C++ Android C/C++ MinGW C/C++

#include <CkPrivateKey.h>
#include <CkStringBuilder.h>

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

    // Load an Ed25519 key from some format..
    CkPrivateKey privKey;

    // This loads an Ed25519 key from an unencrypted PEM file (no password required).
    bool success = privKey.LoadAnyFormatFile("qa_data/eddsa/ed25519.pem","");
    if (success == false) {
        std::cout << privKey.lastErrorText() << "\r\n";
        return;
    }

    // The key type should be "ed25519" to indicate an Ed25519 key.
    std::cout << "key type = " << privKey.keyType() << "\r\n";

    // What is the size of the private key in bits?  (should always be 256 bits for Ed25519)
    std::cout << "size in bits = " << privKey.get_BitLength() << "\r\n";

    // Get the private and public key parts in raw hex format:
    CkStringBuilder sbPubKeyHex;
    const char *privKeyHex = privKey.getRawHex(sbPubKeyHex);

    // We should have a 32-byte private key (a 64 character hex string).
    std::cout << "private key = " << privKeyHex << "\r\n";

    // We should have a 32-byte public key (a 64 character hex string).
    std::cout << "public key = " << sbPubKeyHex.getAsString() << "\r\n";

    // Sample output:
    // key type = ed25519
    // size in bits = 256
    // private key = d4ee72dbf913584ad5b6d8f1f769f8ad3afe7c28cbf1d4fbe097a88f44755842
    // public key = 19bf44096984cdfe8541bac167dc3b96c85086aa30b6b6cb0c5c38ad703166e1
    }