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crypto: remove CRYPTO_TFM_RES_WEAK_KEY

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The CRYPTO_TFM_RES_WEAK_KEY flag was apparently meant as a way to make
the ->setkey() functions provide more information about errors.

However, no one actually checks for this flag, which makes it pointless.
There are also no tests that verify that all algorithms actually set (or
don't set) it correctly.

This is also the last remaining CRYPTO_TFM_RES_* flag, which means that
it's the only thing still needing all the boilerplate code which
propagates these flags around from child => parent tfms.

And if someone ever needs to distinguish this error in the future (which
is somewhat unlikely, as it's been unneeded for a long time), it would
be much better to just define a new return value like -EKEYREJECTED.
That would be much simpler, less error-prone, and easier to test.

So just remove this flag.

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 2019-12-30 21:19:37 -06:00 committed by Herbert Xu
parent 674f368a95
commit c4c4db0d59
5 changed files with 11 additions and 54 deletions
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10
crypto/des_generic.c
View File

@ -29,11 +29,8 @@ static int des_setkey(struct crypto_tfm *tfm, const u8 *key,
else
err = 0;
}
if (err) {
if (err)
memset(dctx, 0, sizeof(*dctx));
crypto_tfm_set_flags(tfm, CRYPTO_TFM_RES_WEAK_KEY);
}
return err;
}
@ -64,11 +61,8 @@ static int des3_ede_setkey(struct crypto_tfm *tfm, const u8 *key,
else
err = 0;
}
if (err) {
if (err)
memset(dctx, 0, sizeof(*dctx));
crypto_tfm_set_flags(tfm, CRYPTO_TFM_RES_WEAK_KEY);
}
return err;
}

28
drivers/crypto/ixp4xx_crypto.c
View File

@ -740,6 +740,7 @@ static int setup_cipher(struct crypto_tfm *tfm, int encrypt,
u32 keylen_cfg = 0;
struct ix_sa_dir *dir;
struct ixp_ctx *ctx = crypto_tfm_ctx(tfm);
int err;
dir = encrypt ? &ctx->encrypt : &ctx->decrypt;
cinfo = dir->npe_ctx;
@ -760,7 +761,9 @@ static int setup_cipher(struct crypto_tfm *tfm, int encrypt,
}
cipher_cfg |= keylen_cfg;
} else {
crypto_des_verify_key(tfm, key);
err = crypto_des_verify_key(tfm, key);
if (err)
return err;
}
/* write cfg word to cryptinfo */
*(u32*)cinfo = cpu_to_be32(cipher_cfg);
@ -817,7 +820,6 @@ static int ablk_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned int key_len)
{
struct ixp_ctx *ctx = crypto_skcipher_ctx(tfm);
u32 *flags = &tfm->base.crt_flags;
int ret;
init_completion(&ctx->completion);
@ -833,16 +835,6 @@ static int ablk_setkey(struct crypto_skcipher *tfm, const u8 *key,
if (ret)
goto out;
ret = setup_cipher(&tfm->base, 1, key, key_len);
if (ret)
goto out;
if (*flags & CRYPTO_TFM_RES_WEAK_KEY) {
if (*flags & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS) {
ret = -EINVAL;
} else {
*flags &= ~CRYPTO_TFM_RES_WEAK_KEY;
}
}
out:
if (!atomic_dec_and_test(&ctx->configuring))
wait_for_completion(&ctx->completion);
@ -1094,7 +1086,6 @@ static int aead_perform(struct aead_request *req, int encrypt,
static int aead_setup(struct crypto_aead *tfm, unsigned int authsize)
{
struct ixp_ctx *ctx = crypto_aead_ctx(tfm);
u32 *flags = &tfm->base.crt_flags;
unsigned digest_len = crypto_aead_maxauthsize(tfm);
int ret;
@ -1118,17 +1109,6 @@ static int aead_setup(struct crypto_aead *tfm, unsigned int authsize)
goto out;
ret = setup_auth(&tfm->base, 1, authsize, ctx->authkey,
ctx->authkey_len, digest_len);
if (ret)
goto out;
if (*flags & CRYPTO_TFM_RES_WEAK_KEY) {
if (*flags & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS) {
ret = -EINVAL;
goto out;
} else {
*flags &= ~CRYPTO_TFM_RES_WEAK_KEY;
}
}
out:
if (!atomic_dec_and_test(&ctx->configuring))
wait_for_completion(&ctx->completion);

15
include/crypto/internal/des.h
View File

@ -35,10 +35,6 @@ static inline int crypto_des_verify_key(struct crypto_tfm *tfm, const u8 *key)
else
err = 0;
}
if (err)
crypto_tfm_set_flags(tfm, CRYPTO_TFM_RES_WEAK_KEY);
memzero_explicit(&tmp, sizeof(tmp));
return err;
}
@ -95,14 +91,9 @@ static inline int des3_ede_verify_key(const u8 *key, unsigned int key_len,
static inline int crypto_des3_ede_verify_key(struct crypto_tfm *tfm,
const u8 *key)
{
int err;
err = des3_ede_verify_key(key, DES3_EDE_KEY_SIZE,
crypto_tfm_get_flags(tfm) &
CRYPTO_TFM_REQ_FORBID_WEAK_KEYS);
if (err)
crypto_tfm_set_flags(tfm, CRYPTO_TFM_RES_WEAK_KEY);
return err;
return des3_ede_verify_key(key, DES3_EDE_KEY_SIZE,
crypto_tfm_get_flags(tfm) &
CRYPTO_TFM_REQ_FORBID_WEAK_KEYS);
}
static inline int verify_skcipher_des_key(struct crypto_skcipher *tfm,

11
include/crypto/xts.h
View File

@ -11,8 +11,6 @@
static inline int xts_check_key(struct crypto_tfm *tfm,
const u8 *key, unsigned int keylen)
{
u32 *flags = &tfm->crt_flags;
/*
* key consists of keys of equal size concatenated, therefore
* the length must be even.
@ -21,11 +19,8 @@ static inline int xts_check_key(struct crypto_tfm *tfm,
return -EINVAL;
/* ensure that the AES and tweak key are not identical */
if (fips_enabled &&
!crypto_memneq(key, key + (keylen / 2), keylen / 2)) {
*flags |= CRYPTO_TFM_RES_WEAK_KEY;
if (fips_enabled && !crypto_memneq(key, key + (keylen / 2), keylen / 2))
return -EINVAL;
}
return 0;
}
@ -43,10 +38,8 @@ 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_FORBID_WEAK_KEYS)) &&
!crypto_memneq(key, key + (keylen / 2), keylen / 2)) {
crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_WEAK_KEY);
!crypto_memneq(key, key + (keylen / 2), keylen / 2))
return -EINVAL;
}
return 0;
}

1
include/linux/crypto.h
View File

@ -112,7 +112,6 @@
#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
/*
* Miscellaneous stuff.