[CRYPTO] aead: Add aead_geniv_alloc/aead_geniv_free

This patch creates the infrastructure to help the construction of IV
generator templates that wrap around AEAD algorithms by adding an IV
generator to them.  This is useful for AEAD algorithms with no built-in
IV generator or to replace their built-in generator.

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

1 files changed, 77 insertions, 0 deletions

diff --git a/include/crypto/internal/aead.h b/include/crypto/internal/aead.h
new file mode 100644
index 000000000000..eb4eee7a7804
--- /dev/null
+++ b/include/crypto/internal/aead.h
@@ -0,0 +1,77 @@
+/*
+ * AEAD: Authenticated Encryption with Associated Data
+ * 
+ * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option) 
+ * any later version.
+ *
+ */
+
+#ifndef _CRYPTO_INTERNAL_AEAD_H
+#define _CRYPTO_INTERNAL_AEAD_H
+
+#include <crypto/aead.h>
+#include <crypto/algapi.h>
+#include <linux/types.h>
+
+struct rtattr;
+
+struct crypto_aead_spawn {
+        struct crypto_spawn base;
+};
+
+extern const struct crypto_type crypto_nivaead_type;
+
+static inline void crypto_set_aead_spawn(
+        struct crypto_aead_spawn *spawn, struct crypto_instance *inst)
+{
+        crypto_set_spawn(&spawn->base, inst);
+}
+
+static inline void crypto_drop_aead(struct crypto_aead_spawn *spawn)
+{
+        crypto_drop_spawn(&spawn->base);
+}
+
+static inline struct crypto_alg *crypto_aead_spawn_alg(
+        struct crypto_aead_spawn *spawn)
+{
+        return spawn->base.alg;
+}
+
+static inline struct crypto_aead *crypto_spawn_aead(
+        struct crypto_aead_spawn *spawn)
+{
+        return __crypto_aead_cast(
+                crypto_spawn_tfm(&spawn->base, CRYPTO_ALG_TYPE_AEAD,
+                                 CRYPTO_ALG_TYPE_MASK));
+}
+
+struct crypto_instance *aead_geniv_alloc(struct crypto_template *tmpl,
+                                         struct rtattr **tb, u32 type,
+                                         u32 mask);
+void aead_geniv_free(struct crypto_instance *inst);
+int aead_geniv_init(struct crypto_tfm *tfm);
+void aead_geniv_exit(struct crypto_tfm *tfm);
+
+static inline struct crypto_aead *aead_geniv_base(struct crypto_aead *geniv)
+{
+        return crypto_aead_crt(geniv)->base;
+}
+
+static inline void *aead_givcrypt_reqctx(struct aead_givcrypt_request *req)
+{
+        return aead_request_ctx(&req->areq);
+}
+
+static inline void aead_givcrypt_complete(struct aead_givcrypt_request *req,
+                                          int err)
+{
+        aead_request_complete(&req->areq, err);
+}
+
+#endif  /* _CRYPTO_INTERNAL_AEAD_H */
+