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#include <string.h>
#include <ctype.h>
#include <gcrypt.h>
#include "libcryptsetup.h"
#include "internal.h"
#define MAX_DIGESTS 64
#define GCRYPT_REQ_VERSION "1.1.42"
static int gcrypt_hash(void *data, int size, char *key, const char *passphrase)
{
gcry_md_hd_t md;
int algo = (int)data;
int len = gcry_md_get_algo_dlen(algo);
int round, i;
if (gcry_md_open(&md, algo, 0))
return -1;
for(round = 0; size; round++) {
/* hack from hashalot to avoid null bytes in key */
for(i = 0; i < round; i++)
gcry_md_write(md, "A", 1);
gcry_md_write(md, passphrase, strlen(passphrase));
if (len > size)
len = size;
memcpy(key, gcry_md_read(md, algo), len);
key += len;
size -= len;
if (size)
gcry_md_reset(md);
}
gcry_md_close(md);
return 0;
}
static struct hash_type *gcrypt_get_hashes(void)
{
struct hash_type *hashes;
int size = MAX_DIGESTS;
int *list;
int i;
gcry_error_t r;
if (!gcry_check_version(GCRYPT_REQ_VERSION))
return NULL;
list = (int *)malloc(sizeof(*list) * size);
if (!list)
return NULL;
r = gcry_md_list(list, &size);
if (r || !size) {
free(list);
return NULL;
}
hashes = malloc(sizeof(*hashes) * (size + 1));
if (!hashes) {
free(list);
return NULL;
}
for(i = 0; i < size; i++) {
char *p;
hashes[i].name = strdup(gcry_md_algo_name(list[i]));
for(p = (char *)hashes[i].name; *p; p++)
*p = tolower(*p);
hashes[i].private = (void *)list[i];
hashes[i].fn = gcrypt_hash;
}
hashes[i].name = NULL;
hashes[i].private = NULL;
hashes[i].fn = NULL;
free(list);
return hashes;
}
static void gcrypt_free_hashes(struct hash_type *hashes)
{
struct hash_type *hash;
for(hash = hashes; hash->name; hash++)
free(hash->name);
free(hashes);
}
struct hash_backend hash_gcrypt_backend = {
.name = "libgcrypt",
.get_hashes = gcrypt_get_hashes,
.free_hashes = gcrypt_free_hashes
};
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