1 files changed, 126 insertions, 0 deletions
diff --git a/c_src/include/crypto/skcipher.h b/c_src/include/crypto/skcipher.h
new file mode 100644
index 00000000..5989855d
--- /dev/null
+++ b/c_src/include/crypto/skcipher.h
@@ -0,0 +1,126 @@
+/*
+ * Symmetric key ciphers.
+ * 
+ * Copyright (c) 2007-2015 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_SKCIPHER_H
+#define _CRYPTO_SKCIPHER_H
+
+#include <linux/crypto.h>
+
+struct crypto_skcipher;
+struct skcipher_request;
+
+struct skcipher_alg {
+	struct crypto_alg base;
+};
+
+int crypto_register_skcipher(struct skcipher_alg *alg);
+
+struct crypto_skcipher {
+	int (*setkey)(struct crypto_skcipher *tfm, const u8 *key,
+	              unsigned int keylen);
+	int (*encrypt)(struct skcipher_request *req);
+	int (*decrypt)(struct skcipher_request *req);
+
+	unsigned		ivsize;
+	unsigned		keysize;
+
+	struct crypto_tfm	base;
+};
+
+struct crypto_sync_skcipher {
+	struct crypto_skcipher base;
+};
+
+struct crypto_skcipher *crypto_alloc_skcipher(const char *alg_name,
+					      u32 type, u32 mask);
+
+static inline struct crypto_sync_skcipher *
+crypto_alloc_sync_skcipher(const char *alg_name, u32 type, u32 mask)
+{
+	return (void *) crypto_alloc_skcipher(alg_name, type, mask);
+}
+
+static inline void crypto_free_skcipher(struct crypto_skcipher *tfm)
+{
+	kfree(tfm);
+}
+
+static inline void crypto_free_sync_skcipher(struct crypto_sync_skcipher *tfm)
+{
+	crypto_free_skcipher(&tfm->base);
+}
+
+struct skcipher_request {
+	unsigned		cryptlen;
+	u8			*iv;
+
+	struct scatterlist	*src;
+	struct scatterlist	*dst;
+
+	struct crypto_tfm	*tfm;
+};
+
+#define MAX_SYNC_SKCIPHER_REQSIZE      384
+#define SYNC_SKCIPHER_REQUEST_ON_STACK(name, tfm) \
+	char __##name##_desc[sizeof(struct skcipher_request) + \
+			     MAX_SYNC_SKCIPHER_REQSIZE + \
+			     (!(sizeof((struct crypto_sync_skcipher *)1 == \
+				       (typeof(tfm))1))) \
+			    ] CRYPTO_MINALIGN_ATTR; \
+	struct skcipher_request *name = (void *)__##name##_desc
+
+static inline int crypto_skcipher_setkey(struct crypto_skcipher *tfm,
+					 const u8 *key, unsigned int keylen)
+{
+	return tfm->setkey(tfm, key, keylen);
+}
+
+static inline struct crypto_skcipher *crypto_skcipher_reqtfm(
+	struct skcipher_request *req)
+{
+	return container_of(req->tfm, struct crypto_skcipher, base);
+}
+
+static inline int crypto_skcipher_encrypt(struct skcipher_request *req)
+{
+	return crypto_skcipher_reqtfm(req)->encrypt(req);
+}
+
+static inline int crypto_skcipher_decrypt(struct skcipher_request *req)
+{
+	return crypto_skcipher_reqtfm(req)->decrypt(req);
+}
+
+static inline void skcipher_request_set_tfm(struct skcipher_request *req,
+					    struct crypto_skcipher *tfm)
+{
+	req->tfm = &tfm->base;
+}
+
+static inline void skcipher_request_set_sync_tfm(struct skcipher_request *req,
+					    struct crypto_sync_skcipher *tfm)
+{
+	skcipher_request_set_tfm(req, &tfm->base);
+}
+
+static inline void skcipher_request_set_crypt(
+	struct skcipher_request *req,
+	struct scatterlist *src, struct scatterlist *dst,
+	unsigned int cryptlen, void *iv)
+{
+	req->src	= src;
+	req->dst	= dst;
+	req->cryptlen	= cryptlen;
+	req->iv		= iv;
+}
+
+#endif	/* _CRYPTO_SKCIPHER_H */