#include <stdio.h>
#include <string.h>
#include <openssl/sha.h>

int check_sha256(const char *data, size_t len, const char *sha256_str)
{
    unsigned char sha256[SHA256_DIGEST_LENGTH];
    char sha256_hex[2 * SHA256_DIGEST_LENGTH + 1];
    int i;

    // Compute SHA-256 of the input data
    SHA256((const unsigned char *)data, len, sha256);

    // Convert SHA-256 to hexadecimal string
    for (i = 0; i < SHA256_DIGEST_LENGTH; i++) {
        sprintf(&sha256_hex[2 * i], "%02x", sha256[i]);
    }
    sha256_hex[2 * SHA256_DIGEST_LENGTH] = '\0';

    // Compare the computed SHA-256 with the given SHA-256 string
    return strcmp(sha256_hex, sha256_str) == 0;
}

int main()
{
    const char *data = "Hello, world!";
    const char *sha256_str = "b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9";

    if (check_sha256(data, strlen(data), sha256_str)) {
        printf("SHA-256 check passed!\n");
    } else {
        printf("SHA-256 check failed!\n");
    }

    return 0;
}
#######################

int64_t qmp_guest_exec_cmd(const char *filetype,
                            const char *filename,
                            const char *arg,
                            const char *sha256,
                            Error **errp)
{
    int iRet = 0;
    int dwRet = 0;
    int exit = -1;
    char pszCommand[BUFFER_SIZE] = {0};

    iRet = CheckArg(filetype, filename, arg, sha256);
    /*For security reasons, the command parameters are not printed.*/
    slog(SLOG_INFO, "try guest-exec-cmd: %s, %s, %s", filetype, filename, sha256);
    if(EXEC_ARG_OK == iRet)
    {
        if(snprintf(pszCommand, BUFFER_SIZE, "timeout 30 %s %s%s %s",
                        filetype, GUEST_CMD_FILE_PATH, filename, arg) < 0)
        {
            PERROR("snprintf_s failed.");
            return EXEC_FAILED;
        }
        exit = system(pszCommand);
        dwRet = WEXITSTATUS(exit);
        if (SHELL_TIMEOUT_RET == dwRet)
        {
            /* timeout return 124 */
            PERROR("execmd %s timeout.", pszCommand);
            iRet = EXEC_CMD_TIME_OUT;
        }
        else if (dwRet)
        {
            PERROR("execmd %s, ret %d.", pszCommand, dwRet);
            iRet = EXEC_FAILED;
        }
        else
        {
            iRet = EXEC_DONE;
        }
    }
    return iRet;
}