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crypto: clarify name of WEAK_KEY request flag 

CRYPTO_TFM_REQ_WEAK_KEY confuses newcomers to the crypto API because it
sounds like it is requesting a weak key.  Actually, it is requesting
that weak keys be forbidden (for algorithms that have the notion of
"weak keys"; currently only DES and XTS do).

Also it is only one letter away from CRYPTO_TFM_RES_WEAK_KEY, with which
it can be easily confused.  (This in fact happened in the UX500 driver,
though just in some debugging messages.)

Therefore, make the intent clear by renaming it to
CRYPTO_TFM_REQ_FORBID_WEAK_KEYS.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers 2019-01-18 22:48:00 -08:00 committed by Herbert Xu
parent 37ebffff65
commit 231baecdef
25 changed files with 55 additions and 49 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/s390/crypto/des_s390.c
View File

@ -38,7 +38,7 @@ static int des_setkey(struct crypto_tfm *tfm, const u8 *key,
/* check for weak keys */
if (!des_ekey(tmp, key) &&
(tfm->crt_flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
(tfm->crt_flags & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) {
tfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY;
return -EINVAL;
}
@ -228,7 +228,7 @@ static int des3_setkey(struct crypto_tfm *tfm, const u8 *key,
if (!(crypto_memneq(key, &key[DES_KEY_SIZE], DES_KEY_SIZE) &&
crypto_memneq(&key[DES_KEY_SIZE], &key[DES_KEY_SIZE * 2],
DES_KEY_SIZE)) &&
(tfm->crt_flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
(tfm->crt_flags & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) {
tfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY;
return -EINVAL;
}

4
arch/sparc/crypto/des_glue.c
View File

@ -53,7 +53,7 @@ static int des_set_key(struct crypto_tfm *tfm, const u8 *key,
* weak key detection code.
*/
ret = des_ekey(tmp, key);
if (unlikely(ret == 0) && (*flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
if (unlikely(ret == 0) && (*flags & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) {
*flags |= CRYPTO_TFM_RES_WEAK_KEY;
return -EINVAL;
}
@ -209,7 +209,7 @@ static int des3_ede_set_key(struct crypto_tfm *tfm, const u8 *key,
if (unlikely(!((K[0] ^ K[2]) | (K[1] ^ K[3])) ||
!((K[2] ^ K[4]) | (K[3] ^ K[5]))) &&
(*flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
(*flags & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) {
*flags |= CRYPTO_TFM_RES_WEAK_KEY;
return -EINVAL;
}

4
crypto/des_generic.c
View File

@ -789,7 +789,7 @@ static int des_setkey(struct crypto_tfm *tfm, const u8 *key,
/* Expand to tmp */
ret = des_ekey(tmp, key);
if (unlikely(ret == 0) && (*flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
if (unlikely(ret == 0) && (*flags & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) {
*flags |= CRYPTO_TFM_RES_WEAK_KEY;
return -EINVAL;
}
@ -866,7 +866,7 @@ int __des3_ede_setkey(u32 *expkey, u32 *flags, const u8 *key,
if (unlikely(!((K[0] ^ K[2]) | (K[1] ^ K[3])) ||
!((K[2] ^ K[4]) | (K[3] ^ K[5]))) &&
(*flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
(*flags & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) {
*flags |= CRYPTO_TFM_RES_WEAK_KEY;
return -EINVAL;
}

14
crypto/testmgr.c
View File

@ -706,7 +706,8 @@ static int __test_aead(struct crypto_aead *tfm, int enc,
crypto_aead_clear_flags(tfm, ~0);
if (template[i].wk)
crypto_aead_set_flags(tfm, CRYPTO_TFM_REQ_WEAK_KEY);
crypto_aead_set_flags(tfm,
CRYPTO_TFM_REQ_FORBID_WEAK_KEYS);
if (template[i].klen > MAX_KEYLEN) {
pr_err("alg: aead%s: setkey failed on test %d for %s: key size %d > %d\n",
@ -820,7 +821,8 @@ static int __test_aead(struct crypto_aead *tfm, int enc,
crypto_aead_clear_flags(tfm, ~0);
if (template[i].wk)
crypto_aead_set_flags(tfm, CRYPTO_TFM_REQ_WEAK_KEY);
crypto_aead_set_flags(tfm,
CRYPTO_TFM_REQ_FORBID_WEAK_KEYS);
if (template[i].klen > MAX_KEYLEN) {
pr_err("alg: aead%s: setkey failed on test %d for %s: key size %d > %d\n",
d, j, algo, template[i].klen, MAX_KEYLEN);
@ -1078,7 +1080,7 @@ static int test_cipher(struct crypto_cipher *tfm, int enc,
crypto_cipher_clear_flags(tfm, ~0);
if (template[i].wk)
crypto_cipher_set_flags(tfm, CRYPTO_TFM_REQ_WEAK_KEY);
crypto_cipher_set_flags(tfm, CRYPTO_TFM_REQ_FORBID_WEAK_KEYS);
ret = crypto_cipher_setkey(tfm, template[i].key,
template[i].klen);
@ -1194,8 +1196,7 @@ static int __test_skcipher(struct crypto_skcipher *tfm, int enc,
crypto_skcipher_clear_flags(tfm, ~0);
if (template[i].wk)
crypto_skcipher_set_flags(tfm,
CRYPTO_TFM_REQ_WEAK_KEY);
crypto_skcipher_set_flags(tfm, CRYPTO_TFM_REQ_FORBID_WEAK_KEYS);
ret = crypto_skcipher_setkey(tfm, template[i].key,
template[i].klen);
@ -1265,8 +1266,7 @@ static int __test_skcipher(struct crypto_skcipher *tfm, int enc,
j++;
crypto_skcipher_clear_flags(tfm, ~0);
if (template[i].wk)
crypto_skcipher_set_flags(tfm,
CRYPTO_TFM_REQ_WEAK_KEY);
crypto_skcipher_set_flags(tfm, CRYPTO_TFM_REQ_FORBID_WEAK_KEYS);
ret = crypto_skcipher_setkey(tfm, template[i].key,
template[i].klen);

4
crypto/testmgr.h
View File

@ -50,7 +50,7 @@ struct hash_testvec {
* @ctext: Pointer to ciphertext
* @len: Length of @ptext and @ctext in bytes
* @fail: If set to one, the test need to fail
* @wk: Does the test need CRYPTO_TFM_REQ_WEAK_KEY
* @wk: Does the test need CRYPTO_TFM_REQ_FORBID_WEAK_KEYS?
* ( e.g. test needs to fail due to a weak key )
* @np: numbers of SG to distribute data in (from 1 to MAX_TAP)
* @tap: How to distribute data in @np SGs
@ -91,7 +91,7 @@ struct cipher_testvec {
* @anp: Numbers of SG to distribute assoc data in
* @fail: setkey() failure expected?
* @novrfy: Decryption verification failure expected?
* @wk: Does the test need CRYPTO_TFM_REQ_WEAK_KEY?
* @wk: Does the test need CRYPTO_TFM_REQ_FORBID_WEAK_KEYS?
* (e.g. setkey() needs to fail due to a weak key)
* @klen: Length of @key in bytes
* @plen: Length of @ptext in bytes

2
drivers/crypto/atmel-tdes.c
View File

@ -785,7 +785,7 @@ static int atmel_des_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
}
err = des_ekey(tmp, key);
if (err == 0 && (ctfm->crt_flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
if (err == 0 && (ctfm->crt_flags & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) {
ctfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY;
return -EINVAL;
}

4
drivers/crypto/bcm/cipher.c
View File

@ -1818,7 +1818,7 @@ static int des_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
if (keylen == DES_KEY_SIZE) {
if (des_ekey(tmp, key) == 0) {
if (crypto_ablkcipher_get_flags(cipher) &
CRYPTO_TFM_REQ_WEAK_KEY) {
CRYPTO_TFM_REQ_FORBID_WEAK_KEYS) {
u32 flags = CRYPTO_TFM_RES_WEAK_KEY;
crypto_ablkcipher_set_flags(cipher, flags);
@ -2872,7 +2872,7 @@ static int aead_authenc_setkey(struct crypto_aead *cipher,
if (des_ekey(tmp, keys.enckey) == 0) {
if (crypto_aead_get_flags(cipher) &
CRYPTO_TFM_REQ_WEAK_KEY) {
CRYPTO_TFM_REQ_FORBID_WEAK_KEYS) {
crypto_aead_set_flags(cipher, flags);
return -EINVAL;
}

2
drivers/crypto/ccp/ccp-crypto-des3.c
View File

@ -57,7 +57,7 @@ static int ccp_des3_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
if (unlikely(!((K[0] ^ K[2]) | (K[1] ^ K[3])) ||
!((K[2] ^ K[4]) | (K[3] ^ K[5]))) &&
(*flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
(*flags & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) {
*flags |= CRYPTO_TFM_RES_WEAK_KEY;
return -EINVAL;
}

3
drivers/crypto/ccree/cc_cipher.c
View File

@ -352,7 +352,8 @@ static int cc_cipher_setkey(struct crypto_skcipher *sktfm, const u8 *key,
dev_dbg(dev, "weak 3DES key");
return -EINVAL;
} else if (!des_ekey(tmp, key) &&
(crypto_tfm_get_flags(tfm) & CRYPTO_TFM_REQ_WEAK_KEY)) {
(crypto_tfm_get_flags(tfm) &
CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) {
tfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY;
dev_dbg(dev, "weak DES key");
return -EINVAL;

3
drivers/crypto/hifn_795x.c
View File

@ -1961,7 +1961,8 @@ static int hifn_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
u32 tmp[DES_EXPKEY_WORDS];
int ret = des_ekey(tmp, key);
if (unlikely(ret == 0) && (tfm->crt_flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
if (unlikely(ret == 0) &&
(tfm->crt_flags & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) {
tfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY;
return -EINVAL;
}

2
drivers/crypto/inside-secure/safexcel_cipher.c
View File

@ -940,7 +940,7 @@ static int safexcel_des_setkey(struct crypto_skcipher *ctfm, const u8 *key,
}
ret = des_ekey(tmp, key);
if (!ret && (tfm->crt_flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
if (!ret && (tfm->crt_flags & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) {
tfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY;
return -EINVAL;
}

4
drivers/crypto/ixp4xx_crypto.c
View File

@ -847,7 +847,7 @@ static int ablk_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
goto out;
if (*flags & CRYPTO_TFM_RES_WEAK_KEY) {
if (*flags & CRYPTO_TFM_REQ_WEAK_KEY) {
if (*flags & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS) {
ret = -EINVAL;
} else {
*flags &= ~CRYPTO_TFM_RES_WEAK_KEY;
@ -1125,7 +1125,7 @@ static int aead_setup(struct crypto_aead *tfm, unsigned int authsize)
goto out;
if (*flags & CRYPTO_TFM_RES_WEAK_KEY) {
if (*flags & CRYPTO_TFM_REQ_WEAK_KEY) {
if (*flags & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS) {
ret = -EINVAL;
goto out;
} else {

2
drivers/crypto/marvell/cipher.c
View File

@ -286,7 +286,7 @@ static int mv_cesa_des_setkey(struct crypto_skcipher *cipher, const u8 *key,
}
ret = des_ekey(tmp, key);
if (!ret && (tfm->crt_flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
if (!ret && (tfm->crt_flags & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) {
tfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY;
return -EINVAL;
}

2
drivers/crypto/n2_core.c
View File

@ -772,7 +772,7 @@ static int n2_des_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
}
err = des_ekey(tmp, key);
if (err == 0 && (tfm->crt_flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
if (err == 0 && (tfm->crt_flags & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) {
tfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY;
return -EINVAL;
}

2
drivers/crypto/omap-des.c
View File

@ -662,7 +662,7 @@ static int omap_des_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
pr_debug("enter, keylen: %d\n", keylen);
/* Do we need to test against weak key? */
if (tfm->crt_flags & CRYPTO_TFM_REQ_WEAK_KEY) {
if (tfm->crt_flags & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS) {
u32 tmp[DES_EXPKEY_WORDS];
int ret = des_ekey(tmp, key);

3
drivers/crypto/picoxcell_crypto.c
View File

@ -759,7 +759,8 @@ static int spacc_des_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
}
if (unlikely(!des_ekey(tmp, key)) &&
(crypto_ablkcipher_get_flags(cipher) & CRYPTO_TFM_REQ_WEAK_KEY)) {
(crypto_ablkcipher_get_flags(cipher) &
CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) {
tfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY;
return -EINVAL;
}

4
drivers/crypto/qce/ablkcipher.c
View File

@ -180,8 +180,8 @@ static int qce_ablkcipher_setkey(struct crypto_ablkcipher *ablk, const u8 *key,
u32 tmp[DES_EXPKEY_WORDS];
ret = des_ekey(tmp, key);
if (!ret && crypto_ablkcipher_get_flags(ablk) &
CRYPTO_TFM_REQ_WEAK_KEY)
if (!ret && (crypto_ablkcipher_get_flags(ablk) &
CRYPTO_TFM_REQ_FORBID_WEAK_KEYS))
goto weakkey;
}

2
drivers/crypto/rockchip/rk3288_crypto_ablkcipher.c
View File

@ -60,7 +60,7 @@ static int rk_tdes_setkey(struct crypto_ablkcipher *cipher,
if (keylen == DES_KEY_SIZE) {
if (!des_ekey(tmp, key) &&
(tfm->crt_flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
(tfm->crt_flags & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) {
tfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY;
return -EINVAL;
}

2
drivers/crypto/sunxi-ss/sun4i-ss-cipher.c
View File

@ -517,7 +517,7 @@ int sun4i_ss_des_setkey(struct crypto_skcipher *tfm, const u8 *key,
flags = crypto_skcipher_get_flags(tfm);
ret = des_ekey(tmp, key);
if (unlikely(!ret) && (flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
if (unlikely(!ret) && (flags & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) {
crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_WEAK_KEY);
dev_dbg(ss->dev, "Weak key %u\n", keylen);
return -EINVAL;

2
drivers/crypto/talitos.c
View File

@ -1535,7 +1535,7 @@ static int ablkcipher_setkey(struct crypto_ablkcipher *cipher,
}
if (unlikely(crypto_ablkcipher_get_flags(cipher) &
CRYPTO_TFM_REQ_WEAK_KEY) &&
CRYPTO_TFM_REQ_FORBID_WEAK_KEYS) &&
!des_ekey(tmp, key)) {
crypto_ablkcipher_set_flags(cipher, CRYPTO_TFM_RES_WEAK_KEY);
return -EINVAL;

20
drivers/crypto/ux500/cryp/cryp_core.c
View File

@ -1000,10 +1000,11 @@ static int des_ablkcipher_setkey(struct crypto_ablkcipher *cipher,
}
ret = des_ekey(tmp, key);
if (unlikely(ret == 0) && (*flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
if (unlikely(ret == 0) &&
(*flags & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) {
*flags |= CRYPTO_TFM_RES_WEAK_KEY;
pr_debug(DEV_DBG_NAME " [%s]: CRYPTO_TFM_REQ_WEAK_KEY",
__func__);
pr_debug(DEV_DBG_NAME " [%s]: CRYPTO_TFM_RES_WEAK_KEY",
__func__);
return -EINVAL;
}
@ -1034,18 +1035,19 @@ static int des3_ablkcipher_setkey(struct crypto_ablkcipher *cipher,
/* Checking key interdependency for weak key detection. */
if (unlikely(!((K[0] ^ K[2]) | (K[1] ^ K[3])) ||
!((K[2] ^ K[4]) | (K[3] ^ K[5]))) &&
(*flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
(*flags & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) {
*flags |= CRYPTO_TFM_RES_WEAK_KEY;
pr_debug(DEV_DBG_NAME " [%s]: CRYPTO_TFM_REQ_WEAK_KEY",
__func__);
pr_debug(DEV_DBG_NAME " [%s]: CRYPTO_TFM_RES_WEAK_KEY",
__func__);
return -EINVAL;
}
for (i = 0; i < 3; i++) {
ret = des_ekey(tmp, key + i*DES_KEY_SIZE);
if (unlikely(ret == 0) && (*flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
if (unlikely(ret == 0) &&
(*flags & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) {
*flags |= CRYPTO_TFM_RES_WEAK_KEY;
pr_debug(DEV_DBG_NAME " [%s]: "
"CRYPTO_TFM_REQ_WEAK_KEY", __func__);
pr_debug(DEV_DBG_NAME " [%s]: CRYPTO_TFM_RES_WEAK_KEY",
__func__);
return -EINVAL;
}
}

4
fs/crypto/keyinfo.c
View File

@ -47,7 +47,7 @@ static int derive_key_aes(const u8 *master_key,
tfm = NULL;
goto out;
}
crypto_skcipher_set_flags(tfm, CRYPTO_TFM_REQ_WEAK_KEY);
crypto_skcipher_set_flags(tfm, CRYPTO_TFM_REQ_FORBID_WEAK_KEYS);
req = skcipher_request_alloc(tfm, GFP_NOFS);
if (!req) {
res = -ENOMEM;
@ -257,7 +257,7 @@ allocate_skcipher_for_mode(struct fscrypt_mode *mode, const u8 *raw_key,
mode->friendly_name,
crypto_skcipher_alg(tfm)->base.cra_driver_name);
}
crypto_skcipher_set_flags(tfm, CRYPTO_TFM_REQ_WEAK_KEY);
crypto_skcipher_set_flags(tfm, CRYPTO_TFM_REQ_FORBID_WEAK_KEYS);
err = crypto_skcipher_setkey(tfm, raw_key, mode->keysize);
if (err)
goto err_free_tfm;

5
fs/ecryptfs/crypto.c
View File

@ -610,7 +610,8 @@ int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat)
full_alg_name);
goto out_free;
}
crypto_skcipher_set_flags(crypt_stat->tfm, CRYPTO_TFM_REQ_WEAK_KEY);
crypto_skcipher_set_flags(crypt_stat->tfm,
CRYPTO_TFM_REQ_FORBID_WEAK_KEYS);
rc = 0;
out_free:
kfree(full_alg_name);
@ -1590,7 +1591,7 @@ ecryptfs_process_key_cipher(struct crypto_skcipher **key_tfm,
"[%s]; rc = [%d]\n", full_alg_name, rc);
goto out;
}
crypto_skcipher_set_flags(*key_tfm, CRYPTO_TFM_REQ_WEAK_KEY);
crypto_skcipher_set_flags(*key_tfm, CRYPTO_TFM_REQ_FORBID_WEAK_KEYS);
if (*key_size == 0)
*key_size = crypto_skcipher_default_keysize(*key_tfm);
get_random_bytes(dummy_key, *key_size);

4
include/crypto/xts.h
View File

@ -47,8 +47,8 @@ static inline int xts_verify_key(struct crypto_skcipher *tfm,
}
/* ensure that the AES and tweak key are not identical */
if ((fips_enabled || crypto_skcipher_get_flags(tfm) &
CRYPTO_TFM_REQ_WEAK_KEY) &&
if ((fips_enabled || (crypto_skcipher_get_flags(tfm) &
CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) &&
!crypto_memneq(key, key + (keylen / 2), keylen / 2)) {
crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_WEAK_KEY);
return -EINVAL;

2
include/linux/crypto.h
View File

@ -118,7 +118,7 @@
#define CRYPTO_TFM_REQ_MASK 0x000fff00
#define CRYPTO_TFM_RES_MASK 0xfff00000
#define CRYPTO_TFM_REQ_WEAK_KEY 0x00000100
#define CRYPTO_TFM_REQ_FORBID_WEAK_KEYS 0x00000100
#define CRYPTO_TFM_REQ_MAY_SLEEP 0x00000200
#define CRYPTO_TFM_REQ_MAY_BACKLOG 0x00000400
#define CRYPTO_TFM_RES_WEAK_KEY 0x00100000