123 lines
3.2 KiB
C
Executable file
123 lines
3.2 KiB
C
Executable file
/* 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);
|
|
|
|
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 */
|