[PATCH v3 3/6] crypto: sm2 - make dependent on sm3 library

Tianjia Zhang
2021-12-23T04:37:54Z

SM3 generic library is stand-alone implementation, it is necessary
for the calculation of sm2 z digest to depends on SM3 library
instead of sm3-generic.

Signed-off-by: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
---
crypto/Kconfig | 2 +-
crypto/sm2.c | 38 +++++++++++++++++++-------------------
2 files changed, 20 insertions(+), 20 deletions(-)

diff --git a/crypto/Kconfig b/crypto/Kconfig
index 01b9ca0836a5..60b252975dc4 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -267,7 +267,7 @@ config CRYPTO_ECRDSA

config CRYPTO_SM2
tristate "SM2 algorithm"
- select CRYPTO_SM3
+ select CRYPTO_LIB_SM3
select CRYPTO_AKCIPHER
select CRYPTO_MANAGER
select MPILIB
diff --git a/crypto/sm2.c b/crypto/sm2.c
index db8a4a265669..ae3f77a66070 100644
--- a/crypto/sm2.c
+++ b/crypto/sm2.c
@@ -13,7 +13,7 @@
#include <crypto/internal/akcipher.h>
#include <crypto/akcipher.h>
#include <crypto/hash.h>
-#include <crypto/sm3_base.h>
+#include <crypto/sm3.h>
#include <crypto/rng.h>
#include <crypto/sm2.h>
#include "sm2signature.asn1.h"
@@ -213,7 +213,7 @@ int sm2_get_signature_s(void *context, size_t hdrlen, unsigned char tag,
return 0;
}

-static int sm2_z_digest_update(struct shash_desc *desc,
+static int sm2_z_digest_update(struct sm3_state *sctx,
MPI m, unsigned int pbytes)
{
static const unsigned char zero[32];
@@ -226,20 +226,20 @@ static int sm2_z_digest_update(struct shash_desc *desc,

if (inlen < pbytes) {
/* padding with zero */
- crypto_sm3_update(desc, zero, pbytes - inlen);
- crypto_sm3_update(desc, in, inlen);
+ sm3_update(sctx, zero, pbytes - inlen);
+ sm3_update(sctx, in, inlen);
} else if (inlen > pbytes) {
/* skip the starting zero */
- crypto_sm3_update(desc, in + inlen - pbytes, pbytes);
+ sm3_update(sctx, in + inlen - pbytes, pbytes);
} else {
- crypto_sm3_update(desc, in, inlen);
+ sm3_update(sctx, in, inlen);
}

kfree(in);
return 0;
}

-static int sm2_z_digest_update_point(struct shash_desc *desc,
+static int sm2_z_digest_update_point(struct sm3_state *sctx,
MPI_POINT point, struct mpi_ec_ctx *ec, unsigned int pbytes)
{
MPI x, y;
@@ -249,8 +249,8 @@ static int sm2_z_digest_update_point(struct shash_desc *desc,
y = mpi_new(0);

if (!mpi_ec_get_affine(x, y, point, ec) &&
- !sm2_z_digest_update(desc, x, pbytes) &&
- !sm2_z_digest_update(desc, y, pbytes))
+ !sm2_z_digest_update(sctx, x, pbytes) &&
+ !sm2_z_digest_update(sctx, y, pbytes))
ret = 0;

mpi_free(x);
@@ -265,7 +265,7 @@ int sm2_compute_z_digest(struct crypto_akcipher *tfm,
struct mpi_ec_ctx *ec = akcipher_tfm_ctx(tfm);
uint16_t bits_len;
unsigned char entl[2];
- SHASH_DESC_ON_STACK(desc, NULL);
+ struct sm3_state sctx;
unsigned int pbytes;

if (id_len > (USHRT_MAX / 8) || !ec->Q)
@@ -278,17 +278,17 @@ int sm2_compute_z_digest(struct crypto_akcipher *tfm,
pbytes = MPI_NBYTES(ec->p);

/* ZA = H256(ENTLA | IDA | a | b | xG | yG | xA | yA) */
- sm3_base_init(desc);
- crypto_sm3_update(desc, entl, 2);
- crypto_sm3_update(desc, id, id_len);
-
- if (sm2_z_digest_update(desc, ec->a, pbytes) ||
- sm2_z_digest_update(desc, ec->b, pbytes) ||
- sm2_z_digest_update_point(desc, ec->G, ec, pbytes) ||
- sm2_z_digest_update_point(desc, ec->Q, ec, pbytes))
+ sm3_init(&sctx);
+ sm3_update(&sctx, entl, 2);
+ sm3_update(&sctx, id, id_len);
+
+ if (sm2_z_digest_update(&sctx, ec->a, pbytes) ||
+ sm2_z_digest_update(&sctx, ec->b, pbytes) ||
+ sm2_z_digest_update_point(&sctx, ec->G, ec, pbytes) ||
+ sm2_z_digest_update_point(&sctx, ec->Q, ec, pbytes))
return -EINVAL;

- crypto_sm3_final(desc, dgst);
+ sm3_final(&sctx, dgst);
return 0;
}
EXPORT_SYMBOL(sm2_compute_z_digest);