sign_verify_bchain.c

Example of signature and hash verification. Includes hash operations and public key recovery from the signature.

See Note on examples.

#include <string.h>
#include <stdlib.h>
#include <stdio.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";
 
    BYTE see = DN_BCHAIN_VER_BIP32_TESTNET;
 
    // Mensagem que será assinada
    BYTE pbData[1024] = {0};
 
    BYTE pbHash[DN_BCHAIN_HASH_KECCAK256_LEN] = {0};
    DWORD dwHashLen = sizeof(pbHash);
 
    BYTE pbSig[DN_BCHAIN_MAX_SIG_LEN] = {0};
    DWORD dwSigLen = sizeof(pbSig);
 
    DN_BCHAIN_PBK pPbk = {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");
 
    nRet = DBchainCreateXPrv(hSession,
                             DN_BCHAIN_BIP32_XPRV,
                             BCHAIN_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");
 
    /*
        This API is available for implementation validation, it is recommended to
        that the hash is made by software for better performance and better use
        of the HSM's resources.
    */
    nRet = DBchainHashData(hSession,
                           DN_BCHAIN_HASH_KECCAK256,
                           pbData,
                           sizeof(pbData),
                           pbHash,
                           &dwHashLen,
                           0);
    if (nRet)
    {
        printf("Function failed: DBchainHashData \nError code: %d\n", nRet);
        goto clean;
    }
    printf("Hash generated successfully.\n");
 
    nRet = DBchainSignHash(hSession,
                           DN_BCHAIN_SIG_RAW_ECDSA,
                           DN_BCHAIN_HASH_KECCAK256,
                           pbHash,
                           dwHashLen,
                           szId,
                           pbSig,
                           &dwSigLen,
                           0);
    if(nRet){
        printf("Function failure: DBchainSignHash \nError code: %d\n", nRet);
        goto clean;
    }
    printf("Hash signed successfully.\n");
 
    /*
        Retrieves the public key from the signature. The public key
        can be retrieved in various ways: DBchainGetPubKey, prior registration
        etc.
    */
    nRet = DBchainRecoverPbkFromSignature(hSession,
                                          DN_BCHAIN_SIG_RAW_ECDSA,
                                          DN_BCHAIN_HASH_KECCAK256,
                                          pbHash,
                                          dwHashLen,
                                          pbSig,
                                          dwSigLen,
                                          &pPbk,
                                          0);
    if (nRet)
    {
        printf("Function failed: DBchainRecoverPbkFromSignature \nError code: %d\n", nRet);
        goto clean;
    }
    printf("Public key successfully retrieved from signature.\n");
 
    nRet = DBchainVerify(hSession,
                         DN_BCHAIN_SIG_RAW_ECDSA,
                         DN_BCHAIN_HASH_KECCAK256,
                         pbHash,
                         dwHashLen,
                         pbSig,
                         dwSigLen,
                         pPbk. bType,
                         pPbk. pbPbk,
                         pPbk. bLen,
                         0);
    if (nRet)
    {
        printf("Function failure: DBchainVerify \nError code: %d\n", nRet);
        goto clean;
    }
    printf("Signature successfully verified.\n");
 
    clean:
    // Limpa objetos e recursos
 
    nRet = DRemoveObj(hSession, szId);
    if(nRet){
        printf("Function failed: DRemoveObj \nError code: %d\n", nRet);
        goto clean;
    }
    printf("Bchain key removed from HSM.\n");
 
    if (hSession) {
        DCloseSession(&hSession, 0);
        printf("Session closed.\n");
    }
 
    DFinalize();
    printf("Libraries finished.\n");
 
    return nRet;
}