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-rw-r--r--crypto/api.c10
-rw-r--r--include/linux/crypto.h6
2 files changed, 16 insertions, 0 deletions
diff --git a/crypto/api.c b/crypto/api.c
index 2a81e98a0021..afe4610afc4b 100644
--- a/crypto/api.c
+++ b/crypto/api.c
@@ -257,6 +257,16 @@ struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask)
mask |= CRYPTO_ALG_TESTED;
}
+ /*
+ * If the internal flag is set for a cipher, require a caller to
+ * to invoke the cipher with the internal flag to use that cipher.
+ * Also, if a caller wants to allocate a cipher that may or may
+ * not be an internal cipher, use type | CRYPTO_ALG_INTERNAL and
+ * !(mask & CRYPTO_ALG_INTERNAL).
+ */
+ if (!((type | mask) & CRYPTO_ALG_INTERNAL))
+ mask |= CRYPTO_ALG_INTERNAL;
+
larval = crypto_larval_lookup(name, type, mask);
if (IS_ERR(larval) || !crypto_is_larval(larval))
return larval;
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index fb5ef16d6a12..10df5d2d093a 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -95,6 +95,12 @@
#define CRYPTO_ALG_KERN_DRIVER_ONLY 0x00001000
/*
+ * Mark a cipher as a service implementation only usable by another
+ * cipher and never by a normal user of the kernel crypto API
+ */
+#define CRYPTO_ALG_INTERNAL 0x00002000
+
+/*
* Transform masks and values (for crt_flags).
*/
#define CRYPTO_TFM_REQ_MASK 0x000fff00