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block: cryptoloop - Use new skcipher interface 

This patch replaces uses of blkcipher with the new skcipher
interface.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2016-01-24 21:16:06 +08:00
parent a2d382a4f1
commit 84a2c9319d
1 changed files with 25 additions and 23 deletions
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48
drivers/block/cryptoloop.c
View File

@ -21,9 +21,9 @@
#include <linux/module.h>
#include <crypto/skcipher.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/crypto.h>
#include <linux/blkdev.h>
#include <linux/scatterlist.h>
#include <asm/uaccess.h>
@ -46,7 +46,7 @@ cryptoloop_init(struct loop_device *lo, const struct loop_info64 *info)
char *cipher;
char *mode;
char *cmsp = cms; /* c-m string pointer */
struct crypto_blkcipher *tfm;
struct crypto_skcipher *tfm;
/* encryption breaks for non sector aligned offsets */
@ -82,12 +82,12 @@ cryptoloop_init(struct loop_device *lo, const struct loop_info64 *info)
*cmsp++ = ')';
*cmsp = 0;
tfm = crypto_alloc_blkcipher(cms, 0, CRYPTO_ALG_ASYNC);
tfm = crypto_alloc_skcipher(cms, 0, CRYPTO_ALG_ASYNC);
if (IS_ERR(tfm))
return PTR_ERR(tfm);
err = crypto_blkcipher_setkey(tfm, info->lo_encrypt_key,
info->lo_encrypt_key_size);
err = crypto_skcipher_setkey(tfm, info->lo_encrypt_key,
info->lo_encrypt_key_size);
if (err != 0)
goto out_free_tfm;
@ -96,17 +96,14 @@ cryptoloop_init(struct loop_device *lo, const struct loop_info64 *info)
return 0;
out_free_tfm:
crypto_free_blkcipher(tfm);
crypto_free_skcipher(tfm);
out:
return err;
}
typedef int (*encdec_cbc_t)(struct blkcipher_desc *desc,
struct scatterlist *sg_out,
struct scatterlist *sg_in,
unsigned int nsg);
typedef int (*encdec_cbc_t)(struct skcipher_request *req);
static int
cryptoloop_transfer(struct loop_device *lo, int cmd,
@ -114,11 +111,8 @@ cryptoloop_transfer(struct loop_device *lo, int cmd,
struct page *loop_page, unsigned loop_off,
int size, sector_t IV)
{
struct crypto_blkcipher *tfm = lo->key_data;
struct blkcipher_desc desc = {
.tfm = tfm,
.flags = CRYPTO_TFM_REQ_MAY_SLEEP,
};
struct crypto_skcipher *tfm = lo->key_data;
SKCIPHER_REQUEST_ON_STACK(req, tfm);
struct scatterlist sg_out;
struct scatterlist sg_in;
@ -127,6 +121,10 @@ cryptoloop_transfer(struct loop_device *lo, int cmd,
unsigned in_offs, out_offs;
int err;
skcipher_request_set_tfm(req, tfm);
skcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP,
NULL, NULL);
sg_init_table(&sg_out, 1);
sg_init_table(&sg_in, 1);
@ -135,13 +133,13 @@ cryptoloop_transfer(struct loop_device *lo, int cmd,
in_offs = raw_off;
out_page = loop_page;
out_offs = loop_off;
encdecfunc = crypto_blkcipher_crt(tfm)->decrypt;
encdecfunc = crypto_skcipher_decrypt;
} else {
in_page = loop_page;
in_offs = loop_off;
out_page = raw_page;
out_offs = raw_off;
encdecfunc = crypto_blkcipher_crt(tfm)->encrypt;
encdecfunc = crypto_skcipher_encrypt;
}
while (size > 0) {
@ -152,10 +150,10 @@ cryptoloop_transfer(struct loop_device *lo, int cmd,
sg_set_page(&sg_in, in_page, sz, in_offs);
sg_set_page(&sg_out, out_page, sz, out_offs);
desc.info = iv;
err = encdecfunc(&desc, &sg_out, &sg_in, sz);
skcipher_request_set_crypt(req, &sg_in, &sg_out, sz, iv);
err = encdecfunc(req);
if (err)
return err;
goto out;
IV++;
size -= sz;
@ -163,7 +161,11 @@ cryptoloop_transfer(struct loop_device *lo, int cmd,
out_offs += sz;
}
return 0;
err = 0;
out:
skcipher_request_zero(req);
return err;
}
static int
@ -175,9 +177,9 @@ cryptoloop_ioctl(struct loop_device *lo, int cmd, unsigned long arg)
static int
cryptoloop_release(struct loop_device *lo)
{
struct crypto_blkcipher *tfm = lo->key_data;
struct crypto_skcipher *tfm = lo->key_data;
if (tfm != NULL) {
crypto_free_blkcipher(tfm);
crypto_free_skcipher(tfm);
lo->key_data = NULL;
return 0;
}