crypto: sig - Add interface for sign/verify

Split out the sign/verify functionality from the existing akcipher
interface.  Most algorithms in akcipher either support encryption
and decryption, or signing and verify.  Only one supports both.

As a signature algorithm may not support encryption at all, these
two should be spearated.

For now sig is simply a wrapper around akcipher as all algorithms
remain unchanged.  This is a first step and allows users to start
allocating sig instead of akcipher.

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

1 files changed, 20 insertions, 0 deletions

diff --git a/crypto/internal.h b/crypto/internal.h
index e8c3aad71aa9..e3cf5a658d51 100644
--- a/crypto/internal.h
+++ b/crypto/internal.h
@@ -18,9 +18,12 @@
 #include <linux/numa.h>
 #include <linux/refcount.h>
 #include <linux/rwsem.h>
+#include <linux/scatterlist.h>
 #include <linux/sched.h>
 #include <linux/types.h>
 
+struct akcipher_request;
+struct crypto_akcipher;
 struct crypto_instance;
 struct crypto_template;
 
@@ -32,6 +35,19 @@ struct crypto_larval {
 	bool test_started;
 };
 
+struct crypto_akcipher_sync_data {
+	struct crypto_akcipher *tfm;
+	const void *src;
+	void *dst;
+	unsigned int slen;
+	unsigned int dlen;
+
+	struct akcipher_request *req;
+	struct crypto_wait cwait;
+	struct scatterlist sg[2];
+	u8 *buf;
+};
+
 enum {
 	CRYPTOA_UNSPEC,
 	CRYPTOA_ALG,
@@ -111,6 +127,10 @@ void *crypto_create_tfm_node(struct crypto_alg *alg,
 void *crypto_clone_tfm(const struct crypto_type *frontend,
 		       struct crypto_tfm *otfm);
 
+int crypto_akcipher_sync_prep(struct crypto_akcipher_sync_data *data);
+int crypto_akcipher_sync_post(struct crypto_akcipher_sync_data *data, int err);
+int crypto_init_akcipher_ops_sig(struct crypto_tfm *tfm);
+
 static inline void *crypto_create_tfm(struct crypto_alg *alg,
 			const struct crypto_type *frontend)
 {