crypto: sm2 - make dependent on sm3 library

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>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

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

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);