(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.

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#include <C_CkPrivateKey.h>
#include <C_CkStringBuilder.h>

void ChilkatSample(void)
    {
    HCkPrivateKey privKey;
    BOOL success;
    HCkStringBuilder sbPubKeyHex;
    const char *privKeyHex;

    // 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..
    privKey = CkPrivateKey_Create();

    // This loads an Ed25519 key from an unencrypted PEM file (no password required).
    success = CkPrivateKey_LoadAnyFormatFile(privKey,"qa_data/eddsa/ed25519.pem","");
    if (success == FALSE) {
        printf("%s\n",CkPrivateKey_lastErrorText(privKey));
        CkPrivateKey_Dispose(privKey);
        return;
    }

    // The key type should be "ed25519" to indicate an Ed25519 key.
    printf("key type = %s\n",CkPrivateKey_keyType(privKey));

    // What is the size of the private key in bits?  (should always be 256 bits for Ed25519)
    printf("size in bits = %d\n",CkPrivateKey_getBitLength(privKey));

    // Get the private and public key parts in raw hex format:
    sbPubKeyHex = CkStringBuilder_Create();
    privKeyHex = CkPrivateKey_getRawHex(privKey,sbPubKeyHex);

    // We should have a 32-byte private key (a 64 character hex string).
    printf("private key = %s\n",privKeyHex);

    // We should have a 32-byte public key (a 64 character hex string).
    printf("public key = %s\n",CkStringBuilder_getAsString(sbPubKeyHex));

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


    CkPrivateKey_Dispose(privKey);
    CkStringBuilder_Dispose(sbPubKeyHex);

    }