(MFC) 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++ Libs

See Also: Using MFC CString in Chilkat

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

void ChilkatSample(void)
    {
    CkString strOut;

    // 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) {
        strOut.append(privKey.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // The key type should be "ed25519" to indicate an Ed25519 key.
    strOut.append("key type = ");
    strOut.append(privKey.keyType());
    strOut.append("\r\n");

    // What is the size of the private key in bits?  (should always be 256 bits for Ed25519)
    strOut.append("size in bits = ");
    strOut.appendInt(privKey.get_BitLength());
    strOut.append("\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).
    strOut.append("private key = ");
    strOut.append(privKeyHex);
    strOut.append("\r\n");

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

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


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }