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crypto: shash - require neither or both ->export() and ->import() 

Prevent registering shash algorithms that implement ->export() but not
->import(), or ->import() but not ->export().  Such cases don't make
sense and could confuse the check that shash_prepare_alg() does for just
->export().

I don't believe this affects any existing algorithms; this is just
preventing future mistakes.

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 2019-01-06 19:07:20 -08:00 committed by Herbert Xu
parent 6ebc97006b
commit 41a2e94f81
1 changed files with 3 additions and 0 deletions
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3
crypto/shash.c
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@ -472,6 +472,9 @@ static int shash_prepare_alg(struct shash_alg *alg)
alg->statesize > HASH_MAX_STATESIZE) alg->statesize > HASH_MAX_STATESIZE)
return -EINVAL; return -EINVAL;
if ((alg->export && !alg->import) || (alg->import && !alg->export))
return -EINVAL;
base->cra_type = &crypto_shash_type; base->cra_type = &crypto_shash_type;
base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
base->cra_flags |= CRYPTO_ALG_TYPE_SHASH; base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;