* 'dlen' must be a multiple of the digest size.
*/
static int kdf_ctr(struct kdf_sdesc *sdesc, const u8 *src, unsigned int slen,
- u8 *dst, unsigned int dlen, unsigned int zlen)
+ u8 *dst, unsigned int dlen)
{
struct shash_desc *desc = &sdesc->shash;
unsigned int h = crypto_shash_digestsize(desc->tfm);
if (err)
goto err;
- if (zlen && h) {
- u8 tmpbuffer[32];
- size_t chunk = min_t(size_t, zlen, sizeof(tmpbuffer));
- memset(tmpbuffer, 0, chunk);
-
- do {
- err = crypto_shash_update(desc, tmpbuffer,
- chunk);
- if (err)
- goto err;
-
- zlen -= chunk;
- chunk = min_t(size_t, zlen, sizeof(tmpbuffer));
- } while (zlen);
- }
-
if (src && slen) {
err = crypto_shash_update(desc, src, slen);
if (err)
static int keyctl_dh_compute_kdf(struct kdf_sdesc *sdesc,
char __user *buffer, size_t buflen,
- uint8_t *kbuf, size_t kbuflen, size_t lzero)
+ uint8_t *kbuf, size_t kbuflen)
{
uint8_t *outbuf = NULL;
int ret;
goto err;
}
- ret = kdf_ctr(sdesc, kbuf, kbuflen, outbuf, outbuf_len, lzero);
+ ret = kdf_ctr(sdesc, kbuf, kbuflen, outbuf, outbuf_len);
if (ret)
goto err;
}
ret = keyctl_dh_compute_kdf(sdesc, buffer, buflen, outbuf,
- req->dst_len + kdfcopy->otherinfolen,
- outlen - req->dst_len);
+ req->dst_len + kdfcopy->otherinfolen);
} else if (copy_to_user(buffer, outbuf, req->dst_len) == 0) {
ret = req->dst_len;
} else {