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