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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2019-08-07 08:50:22 +0300
committerMike Snitzer <snitzer@redhat.com>2019-08-23 10:13:13 -0400
commit39d13a1ac41dc8254f484fcd21af7ff05e316fad (patch)
treef76542a2804d0a5cc9b7ee983af1c95e0e5e4daf /drivers/md/dm-crypt.c
parent123d87d553e26f67e7be318c97c971b6b5fb1daa (diff)
dm crypt: reuse eboiv skcipher for IV generation
Instead of instantiating a separate cipher to perform the encryption needed to produce the IV, reuse the skcipher used for the block data and invoke it one additional time for each block to encrypt a zero vector and use the output as the IV. For CBC mode, this is equivalent to using the bare block cipher, but without the risk of ending up with a non-time invariant implementation of AES when the skcipher itself is time variant (e.g., arm64 without Crypto Extensions has a NEON based time invariant implementation of cbc(aes) but no time invariant implementation of the core cipher other than aes-ti, which is not enabled by default). This approach is a compromise between dm-crypt API flexibility and reducing dependence on parts of the crypto API that should not usually be exposed to other subsystems, such as the bare cipher API. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Milan Broz <gmazyland@gmail.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md/dm-crypt.c')
-rw-r--r--drivers/md/dm-crypt.c70
1 files changed, 22 insertions, 48 deletions
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index d5216bcc4649..48cd76c88d77 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -120,10 +120,6 @@ struct iv_tcw_private {
u8 *whitening;
};
-struct iv_eboiv_private {
- struct crypto_cipher *tfm;
-};
-
/*
* Crypt: maps a linear range of a block device
* and encrypts / decrypts at the same time.
@@ -163,7 +159,6 @@ struct crypt_config {
struct iv_benbi_private benbi;
struct iv_lmk_private lmk;
struct iv_tcw_private tcw;
- struct iv_eboiv_private eboiv;
} iv_gen_private;
u64 iv_offset;
unsigned int iv_size;
@@ -847,65 +842,47 @@ static int crypt_iv_random_gen(struct crypt_config *cc, u8 *iv,
return 0;
}
-static void crypt_iv_eboiv_dtr(struct crypt_config *cc)
-{
- struct iv_eboiv_private *eboiv = &cc->iv_gen_private.eboiv;
-
- crypto_free_cipher(eboiv->tfm);
- eboiv->tfm = NULL;
-}
-
static int crypt_iv_eboiv_ctr(struct crypt_config *cc, struct dm_target *ti,
const char *opts)
{
- struct iv_eboiv_private *eboiv = &cc->iv_gen_private.eboiv;
- struct crypto_cipher *tfm;
-
- tfm = crypto_alloc_cipher(cc->cipher, 0, 0);
- if (IS_ERR(tfm)) {
- ti->error = "Error allocating crypto tfm for EBOIV";
- return PTR_ERR(tfm);
+ if (test_bit(CRYPT_MODE_INTEGRITY_AEAD, &cc->cipher_flags)) {
+ ti->error = "AEAD transforms not supported for EBOIV";
+ return -EINVAL;
}
- if (crypto_cipher_blocksize(tfm) != cc->iv_size) {
+ if (crypto_skcipher_blocksize(any_tfm(cc)) != cc->iv_size) {
ti->error = "Block size of EBOIV cipher does "
"not match IV size of block cipher";
- crypto_free_cipher(tfm);
return -EINVAL;
}
- eboiv->tfm = tfm;
return 0;
}
-static int crypt_iv_eboiv_init(struct crypt_config *cc)
+static int crypt_iv_eboiv_gen(struct crypt_config *cc, u8 *iv,
+ struct dm_crypt_request *dmreq)
{
- struct iv_eboiv_private *eboiv = &cc->iv_gen_private.eboiv;
+ u8 buf[MAX_CIPHER_BLOCKSIZE] __aligned(__alignof__(__le64));
+ struct skcipher_request *req;
+ struct scatterlist src, dst;
+ struct crypto_wait wait;
int err;
- err = crypto_cipher_setkey(eboiv->tfm, cc->key, cc->key_size);
- if (err)
- return err;
-
- return 0;
-}
-
-static int crypt_iv_eboiv_wipe(struct crypt_config *cc)
-{
- /* Called after cc->key is set to random key in crypt_wipe() */
- return crypt_iv_eboiv_init(cc);
-}
+ req = skcipher_request_alloc(any_tfm(cc), GFP_KERNEL | GFP_NOFS);
+ if (!req)
+ return -ENOMEM;
-static int crypt_iv_eboiv_gen(struct crypt_config *cc, u8 *iv,
- struct dm_crypt_request *dmreq)
-{
- struct iv_eboiv_private *eboiv = &cc->iv_gen_private.eboiv;
+ memset(buf, 0, cc->iv_size);
+ *(__le64 *)buf = cpu_to_le64(dmreq->iv_sector * cc->sector_size);
- memset(iv, 0, cc->iv_size);
- *(__le64 *)iv = cpu_to_le64(dmreq->iv_sector * cc->sector_size);
- crypto_cipher_encrypt_one(eboiv->tfm, iv, iv);
+ sg_init_one(&src, page_address(ZERO_PAGE(0)), cc->iv_size);
+ sg_init_one(&dst, iv, cc->iv_size);
+ skcipher_request_set_crypt(req, &src, &dst, cc->iv_size, buf);
+ skcipher_request_set_callback(req, 0, crypto_req_done, &wait);
+ err = crypto_wait_req(crypto_skcipher_encrypt(req), &wait);
+ skcipher_request_free(req);
- return 0;
+ return err;
}
static const struct crypt_iv_operations crypt_iv_plain_ops = {
@@ -962,9 +939,6 @@ static struct crypt_iv_operations crypt_iv_random_ops = {
static struct crypt_iv_operations crypt_iv_eboiv_ops = {
.ctr = crypt_iv_eboiv_ctr,
- .dtr = crypt_iv_eboiv_dtr,
- .init = crypt_iv_eboiv_init,
- .wipe = crypt_iv_eboiv_wipe,
.generator = crypt_iv_eboiv_gen
};