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crypto: xts - drop xts_check_key()

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xts_check_key() is obsoleted by xts_verify_key(). Over time XTS crypto
drivers adopted the newer xts_verify_key() variant, but xts_check_key()
is still used by a number of drivers. Switch drivers to use the newer
xts_verify_key() and make a couple of cleanups. This allows us to drop
xts_check_key() completely and avoid redundancy.

Signed-off-by: Vladis Dronov <vdronov@redhat.com>
Reviewed-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Nicolai Stange <nstange@suse.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Vladis Dronov 2022-12-29 22:17:06 +01:00 committed by Herbert Xu
parent 1c4428b295
commit 0ee433676e
9 changed files with 16 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/s390/crypto/paes_s390.c
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@ -474,7 +474,7 @@ static int xts_paes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
return rc;
/*
* xts_check_key verifies the key length is not odd and makes
* xts_verify_key verifies the key length is not odd and makes
* sure that the two keys are not the same. This can be done
* on the two protected keys as well
*/

2
drivers/crypto/atmel-aes.c
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@ -1879,7 +1879,7 @@ static int atmel_aes_xts_setkey(struct crypto_skcipher *tfm, const u8 *key,
struct atmel_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
int err;
err = xts_check_key(crypto_skcipher_tfm(tfm), key, keylen);
err = xts_verify_key(tfm, key, keylen);
if (err)
return err;

2
drivers/crypto/axis/artpec6_crypto.c
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@ -1621,7 +1621,7 @@ artpec6_crypto_xts_set_key(struct crypto_skcipher *cipher, const u8 *key,
crypto_skcipher_ctx(cipher);
int ret;
ret = xts_check_key(&cipher->base, key, keylen);
ret = xts_verify_key(cipher, key, keylen);
if (ret)
return ret;

8
drivers/crypto/cavium/cpt/cptvf_algs.c
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@ -232,13 +232,12 @@ static int cvm_decrypt(struct skcipher_request *req)
static int cvm_xts_setkey(struct crypto_skcipher *cipher, const u8 *key,
u32 keylen)
{
struct crypto_tfm *tfm = crypto_skcipher_tfm(cipher);
struct cvm_enc_ctx *ctx = crypto_tfm_ctx(tfm);
struct cvm_enc_ctx *ctx = crypto_skcipher_ctx(cipher);
int err;
const u8 *key1 = key;
const u8 *key2 = key + (keylen / 2);
err = xts_check_key(tfm, key, keylen);
err = xts_verify_key(cipher, key, keylen);
if (err)
return err;
ctx->key_len = keylen;
@ -289,8 +288,7 @@ static int cvm_validate_keylen(struct cvm_enc_ctx *ctx, u32 keylen)
static int cvm_setkey(struct crypto_skcipher *cipher, const u8 *key,
u32 keylen, u8 cipher_type)
{
struct crypto_tfm *tfm = crypto_skcipher_tfm(cipher);
struct cvm_enc_ctx *ctx = crypto_tfm_ctx(tfm);
struct cvm_enc_ctx *ctx = crypto_skcipher_ctx(cipher);
ctx->cipher_type = cipher_type;
if (!cvm_validate_keylen(ctx, keylen)) {

8
drivers/crypto/cavium/nitrox/nitrox_skcipher.c
View File

@ -337,12 +337,11 @@ static int nitrox_3des_decrypt(struct skcipher_request *skreq)
static int nitrox_aes_xts_setkey(struct crypto_skcipher *cipher,
const u8 *key, unsigned int keylen)
{
struct crypto_tfm *tfm = crypto_skcipher_tfm(cipher);
struct nitrox_crypto_ctx *nctx = crypto_tfm_ctx(tfm);
struct nitrox_crypto_ctx *nctx = crypto_skcipher_ctx(cipher);
struct flexi_crypto_context *fctx;
int aes_keylen, ret;
ret = xts_check_key(tfm, key, keylen);
ret = xts_verify_key(cipher, key, keylen);
if (ret)
return ret;
@ -362,8 +361,7 @@ static int nitrox_aes_xts_setkey(struct crypto_skcipher *cipher,
static int nitrox_aes_ctr_rfc3686_setkey(struct crypto_skcipher *cipher,
const u8 *key, unsigned int keylen)
{
struct crypto_tfm *tfm = crypto_skcipher_tfm(cipher);
struct nitrox_crypto_ctx *nctx = crypto_tfm_ctx(tfm);
struct nitrox_crypto_ctx *nctx = crypto_skcipher_ctx(cipher);
struct flexi_crypto_context *fctx;
int aes_keylen;

2
drivers/crypto/ccree/cc_cipher.c
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@ -460,7 +460,7 @@ static int cc_cipher_setkey(struct crypto_skcipher *sktfm, const u8 *key,
}
if (ctx_p->cipher_mode == DRV_CIPHER_XTS &&
xts_check_key(tfm, key, keylen)) {
xts_verify_key(sktfm, key, keylen)) {
dev_dbg(dev, "weak XTS key");
return -EINVAL;
}

2
drivers/crypto/marvell/octeontx/otx_cptvf_algs.c
View File

@ -398,7 +398,7 @@ static int otx_cpt_skcipher_xts_setkey(struct crypto_skcipher *tfm,
const u8 *key1 = key;
int ret;
ret = xts_check_key(crypto_skcipher_tfm(tfm), key, keylen);
ret = xts_verify_key(tfm, key, keylen);
if (ret)
return ret;
ctx->key_len = keylen;

2
drivers/crypto/marvell/octeontx2/otx2_cptvf_algs.c
View File

@ -412,7 +412,7 @@ static int otx2_cpt_skcipher_xts_setkey(struct crypto_skcipher *tfm,
const u8 *key1 = key;
int ret;
ret = xts_check_key(crypto_skcipher_tfm(tfm), key, keylen);
ret = xts_verify_key(tfm, key, keylen);
if (ret)
return ret;
ctx->key_len = keylen;

22
include/crypto/xts.h
View File

@ -8,23 +8,6 @@
#define XTS_BLOCK_SIZE 16
static inline int xts_check_key(struct crypto_tfm *tfm,
const u8 *key, unsigned int keylen)
{
/*
* key consists of keys of equal size concatenated, therefore
* the length must be even.
*/
if (keylen % 2)
return -EINVAL;
/* ensure that the AES and tweak key are not identical */
if (fips_enabled && !crypto_memneq(key, key + (keylen / 2), keylen / 2))
return -EINVAL;
return 0;
}
static inline int xts_verify_key(struct crypto_skcipher *tfm,
const u8 *key, unsigned int keylen)
{
@ -42,7 +25,10 @@ static inline int xts_verify_key(struct crypto_skcipher *tfm,
if (fips_enabled && keylen != 32 && keylen != 64)
return -EINVAL;
/* ensure that the AES and tweak key are not identical */
/*
* Ensure that the AES and tweak key are not identical when
* in FIPS mode or the FORBID_WEAK_KEYS flag is set.
*/
if ((fips_enabled || (crypto_skcipher_get_flags(tfm) &
CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) &&
!crypto_memneq(key, key + (keylen / 2), keylen / 2))