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Subject[PATCH 6/8] crypto: AF_ALG: make setkey optional
The current AF_ALG implementation requires that a userspace interface
implementation must provide a callback for setkey. Such a call is not
appliable to random number generators.

To prepare AF_ALG for the addition of a random number generator user
space interface, this function callback invocation is made optional.

Signed-off-by: Stephan Mueller <>
crypto/af_alg.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/crypto/af_alg.c b/crypto/af_alg.c
index 635140b..47a199c 100644
--- a/crypto/af_alg.c
+++ b/crypto/af_alg.c
@@ -177,6 +177,9 @@ static int alg_setkey(struct sock *sk, char __user *ukey,
u8 *key;
int err;

+ if (!type->setkey)
+ return -EOPNOTSUPP;
key = sock_kmalloc(sk, keylen, GFP_KERNEL);
if (!key)
return -ENOMEM;

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