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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Shared glue code for 128bit block ciphers
*/
#ifndef _CRYPTO_GLUE_HELPER_H
#define _CRYPTO_GLUE_HELPER_H
#include <crypto/internal/skcipher.h>
#include <linux/kernel.h>
#include <asm/fpu/api.h>
#include <crypto/b128ops.h>
typedef void (*common_glue_func_t)(void *ctx, u8 *dst, const u8 *src);
typedef void (*common_glue_cbc_func_t)(void *ctx, u128 *dst, const u128 *src);
typedef void (*common_glue_ctr_func_t)(void *ctx, u128 *dst, const u128 *src,
le128 *iv);
typedef void (*common_glue_xts_func_t)(void *ctx, u128 *dst, const u128 *src,
le128 *iv);
#define GLUE_FUNC_CAST(fn) ((common_glue_func_t)(fn))
#define GLUE_CBC_FUNC_CAST(fn) ((common_glue_cbc_func_t)(fn))
#define GLUE_CTR_FUNC_CAST(fn) ((common_glue_ctr_func_t)(fn))
#define GLUE_XTS_FUNC_CAST(fn) ((common_glue_xts_func_t)(fn))
struct common_glue_func_entry {
unsigned int num_blocks; /* number of blocks that @fn will process */
union {
common_glue_func_t ecb;
common_glue_cbc_func_t cbc;
common_glue_ctr_func_t ctr;
common_glue_xts_func_t xts;
} fn_u;
};
struct common_glue_ctx {
unsigned int num_funcs;
int fpu_blocks_limit; /* -1 means fpu not needed at all */
/*
* First funcs entry must have largest num_blocks and last funcs entry
* must have num_blocks == 1!
*/
struct common_glue_func_entry funcs[];
};
static inline bool glue_fpu_begin(unsigned int bsize, int fpu_blocks_limit,
struct skcipher_walk *walk,
bool fpu_enabled, unsigned int nbytes)
{
if (likely(fpu_blocks_limit < 0))
return false;
if (fpu_enabled)
return true;
/*
* Vector-registers are only used when chunk to be processed is large
* enough, so do not enable FPU until it is necessary.
*/
if (nbytes < bsize * (unsigned int)fpu_blocks_limit)
return false;
/* prevent sleeping if FPU is in use */
skcipher_walk_atomise(walk);
kernel_fpu_begin();
return true;
}
static inline void glue_fpu_end(bool fpu_enabled)
{
if (fpu_enabled)
kernel_fpu_end();
}
static inline void le128_to_be128(be128 *dst, const le128 *src)
{
dst->a = cpu_to_be64(le64_to_cpu(src->a));
dst->b = cpu_to_be64(le64_to_cpu(src->b));
}
static inline void be128_to_le128(le128 *dst, const be128 *src)
{
dst->a = cpu_to_le64(be64_to_cpu(src->a));
dst->b = cpu_to_le64(be64_to_cpu(src->b));
}
static inline void le128_inc(le128 *i)
{
u64 a = le64_to_cpu(i->a);
u64 b = le64_to_cpu(i->b);
b++;
if (!b)
a++;
i->a = cpu_to_le64(a);
i->b = cpu_to_le64(b);
}
extern int glue_ecb_req_128bit(const struct common_glue_ctx *gctx,
struct skcipher_request *req);
extern int glue_cbc_encrypt_req_128bit(const common_glue_func_t fn,
struct skcipher_request *req);
extern int glue_cbc_decrypt_req_128bit(const struct common_glue_ctx *gctx,
struct skcipher_request *req);
extern int glue_ctr_req_128bit(const struct common_glue_ctx *gctx,
struct skcipher_request *req);
extern int glue_xts_req_128bit(const struct common_glue_ctx *gctx,
struct skcipher_request *req,
common_glue_func_t tweak_fn, void *tweak_ctx,
void *crypt_ctx, bool decrypt);
extern void glue_xts_crypt_128bit_one(void *ctx, u128 *dst, const u128 *src,
le128 *iv, common_glue_func_t fn);
#endif /* _CRYPTO_GLUE_HELPER_H */
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