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crypto: akcipher - default implementations for request callbacks

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Because with the introduction of EC-RDSA and change in workings of RSA
in regard to sign/verify, akcipher could have not all callbacks defined,
check the presence of callbacks in crypto_register_akcipher() and
provide default implementation if the callback is not implemented.

This is suggested by Herbert Xu instead of checking the presence of the
callback on every request.

Signed-off-by: Vitaly Chikunov <vt@altlinux.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Vitaly Chikunov 2019-04-11 18:51:13 +03:00 committed by Herbert Xu
parent 3c2bc63621
commit 78a0324f4a
1 changed files with 14 additions and 0 deletions
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14
crypto/akcipher.c
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@ -119,10 +119,24 @@ static void akcipher_prepare_alg(struct akcipher_alg *alg)
base->cra_flags |= CRYPTO_ALG_TYPE_AKCIPHER; base->cra_flags |= CRYPTO_ALG_TYPE_AKCIPHER;
} }
static int akcipher_default_op(struct akcipher_request *req)
{
return -ENOSYS;
}
int crypto_register_akcipher(struct akcipher_alg *alg) int crypto_register_akcipher(struct akcipher_alg *alg)
{ {
struct crypto_alg *base = &alg->base; struct crypto_alg *base = &alg->base;
if (!alg->sign)
alg->sign = akcipher_default_op;
if (!alg->verify)
alg->verify = akcipher_default_op;
if (!alg->encrypt)
alg->encrypt = akcipher_default_op;
if (!alg->decrypt)
alg->decrypt = akcipher_default_op;
akcipher_prepare_alg(alg); akcipher_prepare_alg(alg);
return crypto_register_alg(base); return crypto_register_alg(base);
} }