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-rw-r--r--crypto/ablkcipher.c46
-rw-r--r--include/crypto/internal/skcipher.h9
-rw-r--r--include/crypto/skcipher.h38
-rw-r--r--include/linux/crypto.h7
4 files changed, 100 insertions, 0 deletions
diff --git a/crypto/ablkcipher.c b/crypto/ablkcipher.c
index 0083140304d..e403d8137ec 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 87879e64ff4..c9402dd12d0 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 00000000000..c283fab5edd
--- /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 d6962b40948..3656a24ea7f 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;
};