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| author | Eric Biggers <ebiggers@google.com> | 2019-12-31 04:19:37 +0100 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2020-01-09 04:30:53 +0100 |
| commit | c4c4db0d59774f6ab726edd012711490437345c2 (patch) | |
| tree | d98651b23aa678635398be4a09d12696ab924162 /include/crypto | |
| parent | crypto: remove CRYPTO_TFM_RES_BAD_KEY_LEN (diff) | |
| download | linux-c4c4db0d59774f6ab726edd012711490437345c2.tar.xz linux-c4c4db0d59774f6ab726edd012711490437345c2.zip | |
crypto: remove CRYPTO_TFM_RES_WEAK_KEY
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>
Diffstat (limited to 'include/crypto')
| -rw-r--r-- | include/crypto/internal/des.h | 15 | ||||
| -rw-r--r-- | include/crypto/xts.h | 11 |
2 files changed, 5 insertions, 21 deletions
diff --git a/include/crypto/internal/des.h b/include/crypto/internal/des.h index 355ddaae3806..723fe5bf16da 100644 --- a/include/crypto/internal/des.h +++ b/include/crypto/internal/des.h @@ -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 @@ bad: 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, diff --git a/include/crypto/xts.h b/include/crypto/xts.h index 57b2c52928db..0f8dba69feb4 100644 --- a/include/crypto/xts.h +++ b/include/crypto/xts.h @@ -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; } |