crypt_sym.c

Example of encryption with symmetric keys.

See Note on examples.

#include <string.h>
#include <stdlib.h>
#include <stdio.h>
 
#include <dinamo.h> /* header do Dinamo */
 
#define HOST_ADDR "127.0.0.1"
#define USER_ID "master"
#define USER_PWD "12345678"
 
#define KEY_ID "sym_key"
#define KEY_TYPE ALG_3DES_168
 
int main()
{
    int nRet = 0;
    struct AUTH_PWD authPwd;
    HSESSIONCTX hSession = NULL;
    HKEYCTX hKey = NULL;
    BYTE pbData[256];
    DWORD cbData;
 
    //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 conexão 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;
    }
 
    //Gera uma chave simétrica
 
    printf("Session with Dinamo established.\n");
 
    nRet = DGenerateKey(hSession, KEY_ID, KEY_TYPE, 0, &hKey);
 
    if (nRet){
        printf("Function failed: DGenerateKey \nError code: %d\n",nRet);
        goto clean;
    }
 
    printf("Key created successfully.\n");
 
    //Dados que serão criptografados
    strcpy((char *)pbData, "Data to be encrypted.");
    cbData = strlen((char *)pbData) + 1;
 
    printf("Original: %s\n", pbData);
    printf("Encrypting "DWORD_PRINT" bytes (padding PKCS#5) \n", cbData);
 
    nRet = DEncrypt(hKey, 0, 1, 0, pbData, &cbData, sizeof(pbData));
 
    if (nRet){
        printf("Function failure: DEncrypt \nError code: %d\n",nRet);
        goto clean;
    }
 
    printf("Data successfully encrypted.\nTotal "DWORD_PRINT" bytes returned\n", cbData);
 
    nRet = DDecrypt(hKey, 0, 1, 0, pbData, &cbData);
 
    if (nRet){
        printf("Function failure: DDecrypt \nError code: %d\n",nRet);
        goto clean;
    }
 
    printf("Decrypted: %s\n", pbData);
    printf(""DWORD_PRINT" bytes\n", cbData);
 
    //Remove a chave do HSM
    nRet = DDestroyKey(&hKey, REMOVE_FROM_HCM);
 
    if (nRet){
        printf("Function failed: DDestroyKey \nError code: %d\n",nRet);
        goto clean;
    }
 
    printf("Key successfully removed.\n");
 
    clean:
 
    if (hKey){
        DDestroyKey(&hKey, 0);
        printf("Key context released.\n");
    }
 
    if (hSession){
        DCloseSession(&hSession, 0);
        printf("Session closed.\n");
    }
 
    DFinalize();
    printf("Libraries finished.\n");
 
    return nRet;
 
}