[CRYPTO] hash: Add asynchronous hash support

This patch adds asynchronous hash and digest support.

Signed-off-by: Loc Ho <lho@amcc.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/crypto/api.c b/crypto/api.c
index 0a0f41e..d06e332 100644
--- a/crypto/api.c
+++ b/crypto/api.c
@@ -235,8 +235,12 @@
 		return crypto_init_cipher_ops(tfm);
 		
 	case CRYPTO_ALG_TYPE_DIGEST:
-		return crypto_init_digest_ops(tfm);
-		
+		if ((mask & CRYPTO_ALG_TYPE_HASH_MASK) !=
+		    CRYPTO_ALG_TYPE_HASH_MASK)
+			return crypto_init_digest_ops_async(tfm);
+		else
+			return crypto_init_digest_ops(tfm);
+
 	case CRYPTO_ALG_TYPE_COMPRESS:
 		return crypto_init_compress_ops(tfm);