4 files changed, 100 insertions, 0 deletions

diff --git a/crypto/ablkcipher.c b/crypto/ablkcipher.c
index 0083140..e403d81 100644
--- a/crypto/ablkcipher.c
+++ b/crypto/ablkcipher.c
@@ -107,6 +107,52 @@ const struct crypto_type crypto_ablkcipher_type = {
 };
 EXPORT_SYMBOL_GPL(crypto_ablkcipher_type);
 
+static int no_givdecrypt(struct skcipher_givcrypt_request *req)
+{
+	return -ENOSYS;
+}
+
+static int crypto_init_givcipher_ops(struct crypto_tfm *tfm, u32 type,
+				      u32 mask)
+{
+	struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
+	struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
+
+	if (alg->ivsize > PAGE_SIZE / 8)
+		return -EINVAL;
+
+	crt->setkey = setkey;
+	crt->encrypt = alg->encrypt;
+	crt->decrypt = alg->decrypt;
+	crt->givencrypt = alg->givencrypt;
+	crt->givdecrypt = alg->givdecrypt ?: no_givdecrypt;
+	crt->ivsize = alg->ivsize;
+
+	return 0;
+}
+
+static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg)
+	__attribute__ ((unused));
+static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg)
+{
+	struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
+
+	seq_printf(m, "type         : givcipher\n");
+	seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
+	seq_printf(m, "min keysize  : %u\n", ablkcipher->min_keysize);
+	seq_printf(m, "max keysize  : %u\n", ablkcipher->max_keysize);
+	seq_printf(m, "ivsize       : %u\n", ablkcipher->ivsize);
+}
+
+const struct crypto_type crypto_givcipher_type = {
+	.ctxsize = crypto_ablkcipher_ctxsize,
+	.init = crypto_init_givcipher_ops,
+#ifdef CONFIG_PROC_FS
+	.show = crypto_givcipher_show,
+#endif
+};
+EXPORT_SYMBOL_GPL(crypto_givcipher_type);
+
 int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, const char *name,
 			 u32 type, u32 mask)
 {
diff --git a/include/crypto/internal/skcipher.h b/include/crypto/internal/skcipher.h
index 87879e6..c9402dd 100644
--- a/include/crypto/internal/skcipher.h
+++ b/include/crypto/internal/skcipher.h
@@ -14,11 +14,14 @@
 #define _CRYPTO_INTERNAL_SKCIPHER_H
 
 #include <crypto/algapi.h>
+#include <crypto/skcipher.h>
 
 struct crypto_skcipher_spawn {
 	struct crypto_spawn base;
 };
 
+extern const struct crypto_type crypto_givcipher_type;
+
 static inline void crypto_set_skcipher_spawn(
 	struct crypto_skcipher_spawn *spawn, struct crypto_instance *inst)
 {
@@ -47,5 +50,11 @@ static inline struct crypto_ablkcipher *crypto_spawn_skcipher(
 				 crypto_skcipher_mask(0)));
 }
 
+static inline void *skcipher_givcrypt_reqctx(
+	struct skcipher_givcrypt_request *req)
+{
+	return ablkcipher_request_ctx(&req->creq);
+}
+
 #endif	/* _CRYPTO_INTERNAL_SKCIPHER_H */
 
diff --git a/include/crypto/skcipher.h b/include/crypto/skcipher.h
new file mode 100644
index 0000000..c283fab
--- /dev/null
+++ b/include/crypto/skcipher.h
@@ -0,0 +1,38 @@
+/*
+ * Symmetric key ciphers.
+ * 
+ * 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_SKCIPHER_H
+#define _CRYPTO_SKCIPHER_H
+
+#include <linux/crypto.h>
+
+/**
+ *	struct skcipher_givcrypt_request - Crypto request with IV generation
+ *	@seq: Sequence number for IV generation
+ *	@giv: Space for generated IV
+ *	@creq: The crypto request itself
+ */
+struct skcipher_givcrypt_request {
+	u64 seq;
+	u8 *giv;
+
+	struct ablkcipher_request creq;
+};
+
+static inline struct crypto_ablkcipher *skcipher_givcrypt_reqtfm(
+	struct skcipher_givcrypt_request *req)
+{
+	return crypto_ablkcipher_reqtfm(&req->creq);
+}
+
+#endif	/* _CRYPTO_SKCIPHER_H */
+
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index d6962b4..3656a24e 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -34,6 +34,7 @@
 #define CRYPTO_ALG_TYPE_HASH		0x00000003
 #define CRYPTO_ALG_TYPE_BLKCIPHER	0x00000004
 #define CRYPTO_ALG_TYPE_ABLKCIPHER	0x00000005
+#define CRYPTO_ALG_TYPE_GIVCIPHER	0x00000006
 #define CRYPTO_ALG_TYPE_COMPRESS	0x00000008
 #define CRYPTO_ALG_TYPE_AEAD		0x00000009
 
@@ -99,6 +100,7 @@ struct crypto_blkcipher;
 struct crypto_hash;
 struct crypto_tfm;
 struct crypto_type;
+struct skcipher_givcrypt_request;
 
 typedef void (*crypto_completion_t)(struct crypto_async_request *req, int err);
 
@@ -178,6 +180,8 @@ struct ablkcipher_alg {
 	              unsigned int keylen);
 	int (*encrypt)(struct ablkcipher_request *req);
 	int (*decrypt)(struct ablkcipher_request *req);
+	int (*givencrypt)(struct skcipher_givcrypt_request *req);
+	int (*givdecrypt)(struct skcipher_givcrypt_request *req);
 
 	unsigned int min_keysize;
 	unsigned int max_keysize;
@@ -320,6 +324,9 @@ struct ablkcipher_tfm {
 	              unsigned int keylen);
 	int (*encrypt)(struct ablkcipher_request *req);
 	int (*decrypt)(struct ablkcipher_request *req);
+	int (*givencrypt)(struct skcipher_givcrypt_request *req);
+	int (*givdecrypt)(struct skcipher_givcrypt_request *req);
+
 	unsigned int ivsize;
 	unsigned int reqsize;
 };