import_export_bchain.c

Example of exporting and importing a blockchain private key.

See Note on examples.

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
 
#include "dinamo.h" /* header of Dinamo */
 
#define HOST_ADDR "127.0.0.1"
#define USER_ID "master"
#define USER_PWD "12345678"
 
int main()
{
    int nRet = 0;
    struct AUTH_PWD authPwd;
    HSESSIONCTX hSession = NULL;
 
    char szId[] = "Test_Key";
    char szIdImp[] = "Test_Imp_key";
 
    BYTE see = DN_BCHAIN_VER_WIF_MAIN_NET;
 
    BYTE *pbKey = NULL;
    DWORD dwKeyLen = 0;
 
    //Inicializa as bibliotecas do Dinamo
    nRet =  DInitialize(0);
    if (nRet)
    {
        printf("Function failure: DInitialize \nError code: %d\n", nRet);
        goto clean;
    }
 
    printf("Libraries initialized.\n");
 
    //Inicializa a estrutura para conexao com o HSM
    strncpy(authPwd. szAddr, HOST_ADDR, sizeof(authPwd.szAddr));
    authPwd. nPort = DEFAULT_PORT;
    strncpy(authPwd. szUserId, USER_ID, sizeof(authPwd.szUserId));
    strncpy(authPwd. szPassword, USER_PWD, sizeof(authPwd.szPassword));
 
    nRet = DOpenSession(&hSession, SS_USER_PWD,(BYTE *)&authPwd, sizeof(authPwd), ENCRYPTED_CONN);
    if (nRet)
    {
        printf("Function failure: DOpenSession \nError code: %d\n", nRet);
        goto clean;
    }
 
    printf("Session with Dinamo established.\n");
 
    //Cria chave de testes
    nRet = DBchainCreateXPrv(hSession,
                             DN_BCHAIN_BIP32_XPRV,
                             EXPORTABLE_KEY,
                             szId,
                             &ver,
                             sizeof(see),
                             0);
    if(nRet)
    {
        printf("Function failed: DBchainCreateXPrv \nError code: %d\n", nRet);
        goto clean;
    }
 
    printf("Bip 32 key created successfully.\n");
 
    /*
        Export the private key.
        The pointer pointed to by pbKey must be freed with DFree() after use.
    */
    nRet = DBchainPkExport(hSession,
                           DN_BCHAIN_KEY_XPRIV,
                           see,
                           0,
                           szId,
                           &pbKey,
                           &dwKeyLen,
                           0);
    if (nRet)
    {
        printf("Function failure: DBchainPkExport \nError code: %d\n", nRet);
        goto clean;
    }
 
    printf("Bip 32 key successfully exported.\n");
 
    //Importa chave privada
    nRet = DBchainPkImport(hSession,
                           DN_BCHAIN_KEY_XPRIV,
                           EXPORTABLE_KEY,
                           szIdImp,
                           pbKey,
                           dwKeyLen,
                           0);
    if (nRet)
    {
        printf("Function failed: DBchainPkImport \nError code: %d\n", nRet);
        goto clean;
    }
 
    printf("Bip 32 key imported successfully.\n");
 
    clean:
 
    //Libera ponteiro da chave exportada
    DFree(pbKey);
 
    //Remove objetos
    nRet = DRemoveObj(hSession, szId);
    if (nRet)
    {
        printf("Function failed: DRemoveObj \nError code: %d\n", nRet);
        goto clean;
    }
    printf("Bchain key removed from HSM.\n");
 
    nRet = DRemoveObj(hSession, szIdImp);
    if (nRet)
    {
        printf("Function failed: DRemoveObj \nError code: %d\n", nRet);
        goto clean;
    }
    printf("Bchain key imported, removed from HSM.\n");
 
    if (hSession) {
        DCloseSession(&hSession, 0);
        printf("Session closed.\n");
    }
 
    DFinalize();
    printf("Libraries finished.\n");
 
    return nRet;
}