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-rw-r--r--include/crypto/internal/skcipher.h253
1 files changed, 253 insertions, 0 deletions
diff --git a/include/crypto/internal/skcipher.h b/include/crypto/internal/skcipher.h
new file mode 100644
index 0000000000..fb3d9e899f
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+++ b/include/crypto/internal/skcipher.h
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+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Symmetric key ciphers.
+ *
+ * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
+ */
+
+#ifndef _CRYPTO_INTERNAL_SKCIPHER_H
+#define _CRYPTO_INTERNAL_SKCIPHER_H
+
+#include <crypto/algapi.h>
+#include <crypto/internal/cipher.h>
+#include <crypto/skcipher.h>
+#include <linux/list.h>
+#include <linux/types.h>
+
+/*
+ * Set this if your algorithm is sync but needs a reqsize larger
+ * than MAX_SYNC_SKCIPHER_REQSIZE.
+ *
+ * Reuse bit that is specific to hash algorithms.
+ */
+#define CRYPTO_ALG_SKCIPHER_REQSIZE_LARGE CRYPTO_ALG_OPTIONAL_KEY
+
+struct aead_request;
+struct rtattr;
+
+struct skcipher_instance {
+ void (*free)(struct skcipher_instance *inst);
+ union {
+ struct {
+ char head[offsetof(struct skcipher_alg, base)];
+ struct crypto_instance base;
+ } s;
+ struct skcipher_alg alg;
+ };
+};
+
+struct crypto_skcipher_spawn {
+ struct crypto_spawn base;
+};
+
+struct skcipher_walk {
+ union {
+ struct {
+ struct page *page;
+ unsigned long offset;
+ } phys;
+
+ struct {
+ u8 *page;
+ void *addr;
+ } virt;
+ } src, dst;
+
+ struct scatter_walk in;
+ unsigned int nbytes;
+
+ struct scatter_walk out;
+ unsigned int total;
+
+ struct list_head buffers;
+
+ u8 *page;
+ u8 *buffer;
+ u8 *oiv;
+ void *iv;
+
+ unsigned int ivsize;
+
+ int flags;
+ unsigned int blocksize;
+ unsigned int stride;
+ unsigned int alignmask;
+};
+
+static inline struct crypto_instance *skcipher_crypto_instance(
+ struct skcipher_instance *inst)
+{
+ return &inst->s.base;
+}
+
+static inline struct skcipher_instance *skcipher_alg_instance(
+ struct crypto_skcipher *skcipher)
+{
+ return container_of(crypto_skcipher_alg(skcipher),
+ struct skcipher_instance, alg);
+}
+
+static inline void *skcipher_instance_ctx(struct skcipher_instance *inst)
+{
+ return crypto_instance_ctx(skcipher_crypto_instance(inst));
+}
+
+static inline void skcipher_request_complete(struct skcipher_request *req, int err)
+{
+ crypto_request_complete(&req->base, err);
+}
+
+int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn,
+ struct crypto_instance *inst,
+ const char *name, u32 type, u32 mask);
+
+static inline void crypto_drop_skcipher(struct crypto_skcipher_spawn *spawn)
+{
+ crypto_drop_spawn(&spawn->base);
+}
+
+static inline struct skcipher_alg *crypto_skcipher_spawn_alg(
+ struct crypto_skcipher_spawn *spawn)
+{
+ return container_of(spawn->base.alg, struct skcipher_alg, base);
+}
+
+static inline struct skcipher_alg *crypto_spawn_skcipher_alg(
+ struct crypto_skcipher_spawn *spawn)
+{
+ return crypto_skcipher_spawn_alg(spawn);
+}
+
+static inline struct crypto_skcipher *crypto_spawn_skcipher(
+ struct crypto_skcipher_spawn *spawn)
+{
+ return crypto_spawn_tfm2(&spawn->base);
+}
+
+static inline void crypto_skcipher_set_reqsize(
+ struct crypto_skcipher *skcipher, unsigned int reqsize)
+{
+ skcipher->reqsize = reqsize;
+}
+
+static inline void crypto_skcipher_set_reqsize_dma(
+ struct crypto_skcipher *skcipher, unsigned int reqsize)
+{
+ reqsize += crypto_dma_align() & ~(crypto_tfm_ctx_alignment() - 1);
+ skcipher->reqsize = reqsize;
+}
+
+int crypto_register_skcipher(struct skcipher_alg *alg);
+void crypto_unregister_skcipher(struct skcipher_alg *alg);
+int crypto_register_skciphers(struct skcipher_alg *algs, int count);
+void crypto_unregister_skciphers(struct skcipher_alg *algs, int count);
+int skcipher_register_instance(struct crypto_template *tmpl,
+ struct skcipher_instance *inst);
+
+int skcipher_walk_done(struct skcipher_walk *walk, int err);
+int skcipher_walk_virt(struct skcipher_walk *walk,
+ struct skcipher_request *req,
+ bool atomic);
+int skcipher_walk_async(struct skcipher_walk *walk,
+ struct skcipher_request *req);
+int skcipher_walk_aead_encrypt(struct skcipher_walk *walk,
+ struct aead_request *req, bool atomic);
+int skcipher_walk_aead_decrypt(struct skcipher_walk *walk,
+ struct aead_request *req, bool atomic);
+void skcipher_walk_complete(struct skcipher_walk *walk, int err);
+
+static inline void skcipher_walk_abort(struct skcipher_walk *walk)
+{
+ skcipher_walk_done(walk, -ECANCELED);
+}
+
+static inline void *crypto_skcipher_ctx(struct crypto_skcipher *tfm)
+{
+ return crypto_tfm_ctx(&tfm->base);
+}
+
+static inline void *crypto_skcipher_ctx_dma(struct crypto_skcipher *tfm)
+{
+ return crypto_tfm_ctx_dma(&tfm->base);
+}
+
+static inline void *skcipher_request_ctx(struct skcipher_request *req)
+{
+ return req->__ctx;
+}
+
+static inline void *skcipher_request_ctx_dma(struct skcipher_request *req)
+{
+ unsigned int align = crypto_dma_align();
+
+ if (align <= crypto_tfm_ctx_alignment())
+ align = 1;
+
+ return PTR_ALIGN(skcipher_request_ctx(req), align);
+}
+
+static inline u32 skcipher_request_flags(struct skcipher_request *req)
+{
+ return req->base.flags;
+}
+
+static inline unsigned int crypto_skcipher_alg_min_keysize(
+ struct skcipher_alg *alg)
+{
+ return alg->min_keysize;
+}
+
+static inline unsigned int crypto_skcipher_alg_max_keysize(
+ struct skcipher_alg *alg)
+{
+ return alg->max_keysize;
+}
+
+static inline unsigned int crypto_skcipher_alg_walksize(
+ struct skcipher_alg *alg)
+{
+ return alg->walksize;
+}
+
+/**
+ * crypto_skcipher_walksize() - obtain walk size
+ * @tfm: cipher handle
+ *
+ * In some cases, algorithms can only perform optimally when operating on
+ * multiple blocks in parallel. This is reflected by the walksize, which
+ * must be a multiple of the chunksize (or equal if the concern does not
+ * apply)
+ *
+ * Return: walk size in bytes
+ */
+static inline unsigned int crypto_skcipher_walksize(
+ struct crypto_skcipher *tfm)
+{
+ return crypto_skcipher_alg_walksize(crypto_skcipher_alg(tfm));
+}
+
+/* Helpers for simple block cipher modes of operation */
+struct skcipher_ctx_simple {
+ struct crypto_cipher *cipher; /* underlying block cipher */
+};
+static inline struct crypto_cipher *
+skcipher_cipher_simple(struct crypto_skcipher *tfm)
+{
+ struct skcipher_ctx_simple *ctx = crypto_skcipher_ctx(tfm);
+
+ return ctx->cipher;
+}
+
+struct skcipher_instance *skcipher_alloc_instance_simple(
+ struct crypto_template *tmpl, struct rtattr **tb);
+
+static inline struct crypto_alg *skcipher_ialg_simple(
+ struct skcipher_instance *inst)
+{
+ struct crypto_cipher_spawn *spawn = skcipher_instance_ctx(inst);
+
+ return crypto_spawn_cipher_alg(spawn);
+}
+
+#endif /* _CRYPTO_INTERNAL_SKCIPHER_H */
+