hash_stream.cpp

Voici un exemple de programme permettant d'effectuer le calcul du HASH d'un buffer mémoire. Ce code est générique et permet d'utiliser tous les algorithmes présent dans la librairie. Les éléments fixés ne le sont qu'à titre d'exemple.

/* -----------------------------------------------------------------------
 *
 * Copyright (c) 2002-2005 Mr Ludovic FLAMENT <ludovic.flament@free.fr>, LIEVIN, FRANCE
 *
 * Termes :
 *
 * L'utilisation et/ou la redistribution de ce code (avec ou sans modification),
 * ainsi que de tous les composants du produit (librairies, documentation, exemples, ...)
 * est soumise aux termes de la licence qui vous est attribuée par son auteur.
 *
 * -----------------------------------------------------------------------
 */

#include <stdlib.h>
#include <stdio.h>

#include <include/ecctk-prototype.h>
#include <include/ecctk-hash.h>

void hash_stream()
{
    s2byte  ret     = -1;

    /* set hash algorithm
     */
#ifndef ECCTK_EVALUATION
    s2byte  algo    = ECCTK_HASH_ALGO_SHA256;
#else
    s2byte  algo    = ECCTK_HASH_ALGO_SHA160;
#endif
    
    /* set stream to hash and create output stream with maximum size for the hash value
     */
    u1byte  in[]    = "Elliptic Curve Cryptographic ToolKit";

#ifndef ECCTK_EVALUATION
    u1byte  hash[ECCTK_HASH_SIZE_SHA512];
#else
    u1byte  hash[ECCTK_HASH_SIZE_SHA160];
#endif
    
    /* the size of hash value, only use to print the result
     */
    u2byte  hashsize;

    switch (algo)
    {
    case ECCTK_HASH_ALGO_MD5:
        hashsize = ECCTK_HASH_SIZE_MD5;
        ret = MD5_StreamHash(in, sizeof(in), hash, hashsize);
        break;
    case ECCTK_HASH_ALGO_SHA160:
        hashsize = ECCTK_HASH_SIZE_SHA160;
        ret = SHA160_StreamHash(in, sizeof(in), hash, hashsize);
        break;
#ifndef ECCTK_EVALUATION
    case ECCTK_HASH_ALGO_SHA256:
        hashsize = ECCTK_HASH_SIZE_SHA256;
        ret = SHA256_StreamHash(in, sizeof(in), hash, hashsize);
        break;
    case ECCTK_HASH_ALGO_SHA384:
        hashsize = ECCTK_HASH_SIZE_SHA384;
        ret = SHA384_StreamHash(in, sizeof(in), hash, hashsize);
        break;
    case ECCTK_HASH_ALGO_SHA512:
        hashsize = ECCTK_HASH_SIZE_SHA512;
        ret = SHA512_StreamHash(in, sizeof(in), hash, hashsize);
        break;
#endif
    case ECCTK_HASH_ALGO_RMD128:
        hashsize = ECCTK_HASH_SIZE_RMD128;
        ret = RIPEMD128_StreamHash(in, sizeof(in), hash, hashsize);
        break;
#ifndef ECCTK_EVALUATION
    case ECCTK_HASH_ALGO_RMD160:
        hashsize = ECCTK_HASH_SIZE_RMD160;
        ret = RIPEMD160_StreamHash(in, sizeof(in), hash, hashsize);
        break;
    case ECCTK_HASH_ALGO_RMD256:
        hashsize = ECCTK_HASH_SIZE_RMD256;
        ret = RIPEMD256_StreamHash(in, sizeof(in), hash, hashsize);
        break;
    case ECCTK_HASH_ALGO_RMD320:
        hashsize = ECCTK_HASH_SIZE_RMD320;
        ret = RIPEMD320_StreamHash(in, sizeof(in), hash, hashsize);
        break;
#endif
    default:
        break;
    }

    if (ret != ECCTK_HASH_NO_ERROR)
        printf("Hash stream failed (Error : %d)\n", ret);
    else
    {
        u4byte i;

        printf("Hash of stream = ");
        for (i = 0; i < hashsize; i++)
            printf("%02x", hash[i]);
        printf("\n");
    }
}

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