crypto: shash - Add shash_attr_alg2 helper

This patch adds the helper shash_attr_alg2 which locates a shash
algorithm based on the information in the given attribute.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 10 insertions, 0 deletions

diff --git a/crypto/shash.c b/crypto/shash.c
index 97f6c8ba103a..21bcff6be5b0 100644
--- a/crypto/shash.c
+++ b/crypto/shash.c
@@ -518,5 +518,15 @@ int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
 }
 EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
 
+struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
+{
+        struct crypto_alg *alg;
+
+        alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
+        return IS_ERR(alg) ? ERR_CAST(alg) :
+               container_of(alg, struct shash_alg, base);
+}
+EXPORT_SYMBOL_GPL(shash_attr_alg);
+
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Synchronous cryptographic hash type");