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authorVitaly Chikunov <vt@altlinux.org>2019-04-11 18:51:13 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2019-04-18 17:15:01 +0300
commit78a0324f4a5328088fea9426cfe1d1851276c475 (patch)
treede5222d19c10023d866d9e59fec731267df9ae2d
parent3c2bc636219fc0c2ea82c8f0d3fb0c9936cf5146 (diff)
downloadlinux-78a0324f4a5328088fea9426cfe1d1851276c475.tar.xz
crypto: akcipher - default implementations for request callbacks
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>
-rw-r--r--crypto/akcipher.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/crypto/akcipher.c b/crypto/akcipher.c
index 0cbeae137e0a..780daa436dac 100644
--- a/crypto/akcipher.c
+++ b/crypto/akcipher.c
@@ -119,10 +119,24 @@ static void akcipher_prepare_alg(struct akcipher_alg *alg)
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)
{
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);
return crypto_register_alg(base);
}