Hashing Data in C

Hashing Data in C

The Hash() function is used to hash a single data. The usage of Hash() is straightforward as shown in the following example. Notice that the use of this function does not require a connection to a key service.

---

Code Samples

See the C environment settings for details on setting the project environment.

---

< c_hash.c>

/****************************************************************************************
*  c_hash.c
*
*
*****************************************************************************************/

#include <stdio.h>
#include <string.h>
#include "teagent_c.h"

void PrintError(const char * msg)
{
    char szErr[1024];
    uint32_t nLength = 1024;
    uint32_t nCode = GetLastTEError(szErr, &nLength);
    printf("%s Code = 0x%x, Message = %s\n", msg, nCode, szErr);
}

int main()
{
    char szData[] = "This is a test string";
    char szSalt[] = "this is our secret";
    char szHashed[30];
    unsigned long length;
    TE_RETCODE ret;  

    /* Initialize the TE environment */
    TEEnvInit();

    printf("Source Data: %s\n", szData);
    printf("Salt       : %s\n", szSalt);

    /* Hash data */
    length = sizeof(szHashed);  /* set buffer size for hashed value */
    ret = Hash(szData, strlen(szData), szHashed, &length, szSalt, strlen(szSalt));

    if(ret)
    {
        PrintError("Hash error:");
    }
    else
    {
        printf("Return value         = %d\n", ret);
        printf("Length of hash value = %d\n", length);
        if(sizeof(szHashed) > length) {
            szHashed[length] = '\0';     /* terminate hashed value at the right position */
            printf("Hashed value : %s\n", szHashed);
        }
    }
    
    /* Uninitialize the TE environment */
    TEEnvClose();

    return 0;
}

Output
Source Data: This is a test string
Salt       : this is our secret
Return value         = 0
Length of hash value = 28
Hashed value : h1S1Tcdvrj9UUGEpua/Kd6oZIKc=