int AF_split(char *src, char *dst, size_t blocksize, unsigned int blocknumbers, const char *hash)
{
unsigned int i;
char *bufblock;
int r = -EINVAL;
const EVP_MD *hash_id;
OpenSSL_add_all_digests();
if (!(hash_id = EVP_get_digestbyname(hash)))
return -EINVAL;
if((bufblock = calloc(blocksize, 1)) == NULL) return -ENOMEM;
/* process everything except the last block */
for(i=0; i<blocknumbers-1; i++) {
r = getRandom(dst+(blocksize*i),blocksize);
if(r < 0) goto out;
XORblock(dst+(blocksize*i),bufblock,bufblock,blocksize);
if(diffuse(bufblock, bufblock, blocksize, hash_id))
goto out;
}
/* the last block is computed */
XORblock(src,bufblock,dst+(i*blocksize),blocksize);
r = 0;
out:
free(bufblock);
return r;
}
int AF_merge(char *src, char *dst, size_t blocksize, unsigned int blocknumbers, const char *hash)
{
unsigned int i;
char *bufblock;
int r = -EINVAL;
const EVP_MD *hash_id;
OpenSSL_add_all_digests();
if (!(hash_id = EVP_get_digestbyname(hash)))
return -EINVAL;
if((bufblock = calloc(blocksize, 1)) == NULL) return -ENOMEM;
memset(bufblock,0,blocksize);
for(i=0; i<blocknumbers-1; i++) {
XORblock(src+(blocksize*i),bufblock,bufblock,blocksize);
if(diffuse(bufblock, bufblock, blocksize, hash_id))
goto out;
}
XORblock(src + blocksize * i, bufblock, dst, blocksize);
r = 0;
out:
free(bufblock);
return 0;
}
int AF_split(char *src, char *dst, size_t blocksize,
unsigned int blocknumbers, const char *hash)
{
unsigned int i;
char *bufblock;
int r = -EINVAL;
if((bufblock = calloc(blocksize, 1)) == NULL) return -ENOMEM;
/* process everything except the last block */
for(i=0; i<blocknumbers-1; i++) {
r = crypt_random_get(NULL, dst+(blocksize*i), blocksize, CRYPT_RND_NORMAL);
if(r < 0) goto out;
XORblock(dst+(blocksize*i),bufblock,bufblock,blocksize);
if(diffuse(bufblock, bufblock, blocksize, hash))
goto out;
}
/* the last block is computed */
XORblock(src,bufblock,dst+(i*blocksize),blocksize);
r = 0;
out:
free(bufblock);
return r;
}
int AF_merge(char *src, char *dst, size_t blocksize,
unsigned int blocknumbers, const char *hash)
{
unsigned int i;
char *bufblock;
int r = -EINVAL;
if((bufblock = calloc(blocksize, 1)) == NULL)
return -ENOMEM;
memset(bufblock,0,blocksize);
for(i=0; i<blocknumbers-1; i++) {
XORblock(src+(blocksize*i),bufblock,bufblock,blocksize);
if(diffuse(bufblock, bufblock, blocksize, hash))
goto out;
}
XORblock(src + blocksize * i, bufblock, dst, blocksize);
r = 0;
out:
free(bufblock);
return r;
}
