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crypto: sm3-generic - Use API partial block handling

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Use the Crypto API partial block handling.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2025-04-18 11:00:45 +08:00
parent f9fbc8bff1
commit 8266393e9b
3 changed files with 52 additions and 25 deletions
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31
crypto/sm3_generic.c
View file

@ -9,15 +9,10 @@
*/
#include <crypto/internal/hash.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/types.h>
#include <crypto/sm3.h>
#include <crypto/sm3_base.h>
#include <linux/bitops.h>
#include <asm/byteorder.h>
#include <linux/unaligned.h>
#include <linux/kernel.h>
#include <linux/module.h>
const u8 sm3_zero_message_hash[SM3_DIGEST_SIZE] = {
0x1A, 0xB2, 0x1D, 0x83, 0x55, 0xCF, 0xA1, 0x7F,
@ -30,38 +25,28 @@ EXPORT_SYMBOL_GPL(sm3_zero_message_hash);
static int crypto_sm3_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
sm3_update(shash_desc_ctx(desc), data, len);
return 0;
}
static int crypto_sm3_final(struct shash_desc *desc, u8 *out)
{
sm3_final(shash_desc_ctx(desc), out);
return 0;
return sm3_base_do_update_blocks(desc, data, len, sm3_block_generic);
}
static int crypto_sm3_finup(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *hash)
{
struct sm3_state *sctx = shash_desc_ctx(desc);
if (len)
sm3_update(sctx, data, len);
sm3_final(sctx, hash);
return 0;
sm3_base_do_finup(desc, data, len, sm3_block_generic);
return sm3_base_finish(desc, hash);
}
static struct shash_alg sm3_alg = {
.digestsize = SM3_DIGEST_SIZE,
.init = sm3_base_init,
.update = crypto_sm3_update,
.final = crypto_sm3_final,
.finup = crypto_sm3_finup,
.descsize = sizeof(struct sm3_state),
.descsize = SM3_STATE_SIZE,
.base = {
.cra_name = "sm3",
.cra_driver_name = "sm3-generic",
.cra_priority = 100,
.cra_flags = CRYPTO_AHASH_ALG_BLOCK_ONLY |
CRYPTO_AHASH_ALG_FINUP_MAX,
.cra_blocksize = SM3_BLOCK_SIZE,
.cra_module = THIS_MODULE,
}

1
include/crypto/sm3.h
View file

@ -14,6 +14,7 @@
#define SM3_DIGEST_SIZE 32
#define SM3_BLOCK_SIZE 64
#define SM3_STATE_SIZE 40
#define SM3_T1 0x79CC4519
#define SM3_T2 0x7A879D8A

45
include/crypto/sm3_base.h
View file

@ -62,6 +62,49 @@ static inline int sm3_base_do_update(struct shash_desc *desc,
return 0;
}
static inline int sm3_base_do_update_blocks(struct shash_desc *desc,
const u8 *data, unsigned int len,
sm3_block_fn *block_fn)
{
unsigned int remain = len - round_down(len, SM3_BLOCK_SIZE);
struct sm3_state *sctx = shash_desc_ctx(desc);
sctx->count += len - remain;
block_fn(sctx, data, len / SM3_BLOCK_SIZE);
return remain;
}
static inline int sm3_base_do_finup(struct shash_desc *desc,
const u8 *src, unsigned int len,
sm3_block_fn *block_fn)
{
unsigned int bit_offset = SM3_BLOCK_SIZE / 8 - 1;
struct sm3_state *sctx = shash_desc_ctx(desc);
union {
__be64 b64[SM3_BLOCK_SIZE / 4];
u8 u8[SM3_BLOCK_SIZE * 2];
} block = {};
if (len >= SM3_BLOCK_SIZE) {
int remain;
remain = sm3_base_do_update_blocks(desc, src, len, block_fn);
src += len - remain;
len = remain;
}
if (len >= bit_offset * 8)
bit_offset += SM3_BLOCK_SIZE / 8;
memcpy(&block, src, len);
block.u8[len] = 0x80;
sctx->count += len;
block.b64[bit_offset] = cpu_to_be64(sctx->count << 3);
block_fn(sctx, block.u8, (bit_offset + 1) * 8 / SM3_BLOCK_SIZE);
memzero_explicit(&block, sizeof(block));
return 0;
}
static inline int sm3_base_do_finalize(struct shash_desc *desc,
sm3_block_fn *block_fn)
{
@ -93,8 +136,6 @@ static inline int sm3_base_finish(struct shash_desc *desc, u8 *out)
for (i = 0; i < SM3_DIGEST_SIZE / sizeof(__be32); i++)
put_unaligned_be32(sctx->state[i], digest++);
memzero_explicit(sctx, sizeof(*sctx));
return 0;
}