The sm2 certificate requires a modified digest. Move the code
for the hashing from the signature verification path into the
code where we generate the digest.
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
---
crypto/asymmetric_keys/public_key.c | 67 -------------------
crypto/asymmetric_keys/x509_public_key.c | 28 +++++---
crypto/sm2.c | 106 ++++++++++++++++++++-----------
include/crypto/public_key.h | 2
include/crypto/sm2.h | 12 ---
5 files changed, 93 insertions(+), 122 deletions(-)
diff --git a/crypto/asymmetric_keys/public_key.c b/crypto/asymmetric_keys/public_key.c
index eca5671ad3f2..c795a12a3599 100644
--- a/crypto/asymmetric_keys/public_key.c
+++ b/crypto/asymmetric_keys/public_key.c
@@ -18,8 +18,6 @@
#include <keys/asymmetric-subtype.h>
#include <crypto/public_key.h>
#include <crypto/akcipher.h>
-#include <crypto/sm2.h>
-#include <crypto/sm3_base.h>
MODULE_DESCRIPTION("In-software asymmetric public-key subtype");
MODULE_AUTHOR("Red Hat, Inc.");
@@ -312,65 +310,6 @@ static int software_key_eds_op(struct kernel_pkey_params *params,
return ret;
}
-#if IS_REACHABLE(CONFIG_CRYPTO_SM2)
-static int cert_sig_digest_update(const struct public_key_signature *sig,
- struct crypto_akcipher *tfm_pkey)
-{
- struct crypto_shash *tfm;
- struct shash_desc *desc;
- size_t desc_size;
- unsigned char dgst[SM3_DIGEST_SIZE];
- int ret;
-
- BUG_ON(!sig->data);
-
- /* SM2 signatures always use the SM3 hash algorithm */
- if (!sig->hash_algo || strcmp(sig->hash_algo, "sm3") != 0)
- return -EINVAL;
-
- ret = sm2_compute_z_digest(tfm_pkey, SM2_DEFAULT_USERID,
- SM2_DEFAULT_USERID_LEN, dgst);
- if (ret)
- return ret;
-
- tfm = crypto_alloc_shash(sig->hash_algo, 0, 0);
- if (IS_ERR(tfm))
- return PTR_ERR(tfm);
-
- desc_size = crypto_shash_descsize(tfm) + sizeof(*desc);
- desc = kzalloc(desc_size, GFP_KERNEL);
- if (!desc) {
- ret = -ENOMEM;
- goto error_free_tfm;
- }
-
- desc->tfm = tfm;
-
- ret = crypto_shash_init(desc);
- if (ret < 0)
- goto error_free_desc;
-
- ret = crypto_shash_update(desc, dgst, SM3_DIGEST_SIZE);
- if (ret < 0)
- goto error_free_desc;
-
- ret = crypto_shash_finup(desc, sig->data, sig->data_size, sig->digest);
-
-error_free_desc:
- kfree(desc);
-error_free_tfm:
- crypto_free_shash(tfm);
- return ret;
-}
-#else
-static inline int cert_sig_digest_update(
- const struct public_key_signature *sig,
- struct crypto_akcipher *tfm_pkey)
-{
- return -ENOTSUPP;
-}
-#endif /* ! IS_REACHABLE(CONFIG_CRYPTO_SM2) */
-
/*
* Verify a signature using a public key.
*/
@@ -438,12 +377,6 @@ int public_key_verify_signature(const struct public_key *pkey,
if (ret)
goto error_free_key;
- if (strcmp(pkey->pkey_algo, "sm2") == 0 && sig->data_size) {
- ret = cert_sig_digest_update(sig, tfm);
- if (ret)
- goto error_free_key;
- }
-
sg_init_table(src_sg, 2);
sg_set_buf(&src_sg[0], sig->s, sig->s_size);
sg_set_buf(&src_sg[1], sig->digest, sig->digest_size);
diff --git a/crypto/asymmetric_keys/x509_public_key.c b/crypto/asymmetric_keys/x509_public_key.c
index 0b4943a4592b..2fca030a6290 100644
--- a/crypto/asymmetric_keys/x509_public_key.c
+++ b/crypto/asymmetric_keys/x509_public_key.c
@@ -6,13 +6,15 @@
*/
#define pr_fmt(fmt) "X.509: "fmt
+#include <crypto/hash.h>
+#include <crypto/sm2.h>
+#include <keys/asymmetric-parser.h>
+#include <keys/asymmetric-subtype.h>
+#include <keys/system_keyring.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
-#include <keys/asymmetric-subtype.h>
-#include <keys/asymmetric-parser.h>
-#include <keys/system_keyring.h>
-#include <crypto/hash.h>
+#include <linux/string.h>
#include "asymmetric_keys.h"
#include "x509_parser.h"
@@ -30,9 +32,6 @@ int x509_get_sig_params(struct x509_certificate *cert)
pr_devel("==>%s()\n", __func__);
- sig->data = cert->tbs;
- sig->data_size = cert->tbs_size;
-
sig->s = kmemdup(cert->raw_sig, cert->raw_sig_size, GFP_KERNEL);
if (!sig->s)
return -ENOMEM;
@@ -65,7 +64,20 @@ int x509_get_sig_params(struct x509_certificate *cert)
desc->tfm = tfm;
- ret = crypto_shash_digest(desc, cert->tbs, cert->tbs_size, sig->digest);
+ if (strcmp(cert->pub->pkey_algo, "sm2") == 0) {
+ ret = strcmp(sig->hash_algo, "sm3") != 0 ? -EINVAL :
+ crypto_shash_init(desc) ?:
+ sm2_compute_z_digest(desc, cert->pub->key,
+ cert->pub->keylen, sig->digest) ?:
+ crypto_shash_init(desc) ?:
+ crypto_shash_update(desc, sig->digest,
+ sig->digest_size) ?:
+ crypto_shash_finup(desc, cert->tbs, cert->tbs_size,
+ sig->digest);
+ } else
+ ret = crypto_shash_digest(desc, cert->tbs, cert->tbs_size,
+ sig->digest);
+
if (ret < 0)
goto error_2;
diff --git a/crypto/sm2.c b/crypto/sm2.c
index ed9307dac3d1..285b3cb7c0bc 100644
--- a/crypto/sm2.c
+++ b/crypto/sm2.c
@@ -13,11 +13,14 @@
#include <crypto/internal/akcipher.h>
#include <crypto/akcipher.h>
#include <crypto/hash.h>
-#include <crypto/sm3.h>
#include <crypto/rng.h>
#include <crypto/sm2.h>
#include "sm2signature.asn1.h"
+/* The default user id as specified in GM/T 0009-2012 */
+#define SM2_DEFAULT_USERID "1234567812345678"
+#define SM2_DEFAULT_USERID_LEN 16
+
#define MPI_NBYTES(m) ((mpi_get_nbits(m) + 7) / 8)
struct ecc_domain_parms {
@@ -60,6 +63,9 @@ static const struct ecc_domain_parms sm2_ecp = {
.h = 1
};
+static int __sm2_set_pub_key(struct mpi_ec_ctx *ec,
+ const void *key, unsigned int keylen);
+
static int sm2_ec_ctx_init(struct mpi_ec_ctx *ec)
{
const struct ecc_domain_parms *ecp = &sm2_ecp;
@@ -213,12 +219,13 @@ int sm2_get_signature_s(void *context, size_t hdrlen, unsigned char tag,
return 0;
}
-static int sm2_z_digest_update(struct sm3_state *sctx,
- MPI m, unsigned int pbytes)
+static int sm2_z_digest_update(struct shash_desc *desc,
+ MPI m, unsigned int pbytes)
{
static const unsigned char zero[32];
unsigned char *in;
unsigned int inlen;
+ int err;
in = mpi_get_buffer(m, &inlen, NULL);
if (!in)
@@ -226,21 +233,22 @@ static int sm2_z_digest_update(struct sm3_state *sctx,
if (inlen < pbytes) {
/* padding with zero */
- sm3_update(sctx, zero, pbytes - inlen);
- sm3_update(sctx, in, inlen);
+ err = crypto_shash_update(desc, zero, pbytes - inlen) ?:
+ crypto_shash_update(desc, in, inlen);
} else if (inlen > pbytes) {
/* skip the starting zero */
- sm3_update(sctx, in + inlen - pbytes, pbytes);
+ err = crypto_shash_update(desc, in + inlen - pbytes, pbytes);
} else {
- sm3_update(sctx, in, inlen);
+ err = crypto_shash_update(desc, in, inlen);
}
kfree(in);
- return 0;
+ return err;
}
-static int sm2_z_digest_update_point(struct sm3_state *sctx,
- MPI_POINT point, struct mpi_ec_ctx *ec, unsigned int pbytes)
+static int sm2_z_digest_update_point(struct shash_desc *desc,
+ MPI_POINT point, struct mpi_ec_ctx *ec,
+ unsigned int pbytes)
{
MPI x, y;
int ret = -EINVAL;
@@ -248,50 +256,68 @@ static int sm2_z_digest_update_point(struct sm3_state *sctx,
x = mpi_new(0);
y = mpi_new(0);
- if (!mpi_ec_get_affine(x, y, point, ec) &&
- !sm2_z_digest_update(sctx, x, pbytes) &&
- !sm2_z_digest_update(sctx, y, pbytes))
- ret = 0;
+ ret = mpi_ec_get_affine(x, y, point, ec) ? -EINVAL :
+ sm2_z_digest_update(desc, x, pbytes) ?:
+ sm2_z_digest_update(desc, y, pbytes);
mpi_free(x);
mpi_free(y);
return ret;
}
-int sm2_compute_z_digest(struct crypto_akcipher *tfm,
- const unsigned char *id, size_t id_len,
- unsigned char dgst[SM3_DIGEST_SIZE])
+int sm2_compute_z_digest(struct shash_desc *desc,
+ const void *key, unsigned int keylen, void *dgst)
{
- struct mpi_ec_ctx *ec = akcipher_tfm_ctx(tfm);
- uint16_t bits_len;
- unsigned char entl[2];
- struct sm3_state sctx;
+ struct mpi_ec_ctx *ec;
+ unsigned int bits_len;
unsigned int pbytes;
+ u8 entl[2];
+ int err;
- if (id_len > (USHRT_MAX / 8) || !ec->Q)
- return -EINVAL;
+ ec = kmalloc(sizeof(*ec), GFP_KERNEL);
+ if (!ec)
+ return -ENOMEM;
+
+ err = __sm2_set_pub_key(ec, key, keylen);
+ if (err)
+ goto out_free_ec;
- bits_len = (uint16_t)(id_len * 8);
+ bits_len = SM2_DEFAULT_USERID_LEN * 8;
entl[0] = bits_len >> 8;
entl[1] = bits_len & 0xff;
pbytes = MPI_NBYTES(ec->p);
/* ZA = H256(ENTLA | IDA | a | b | xG | yG | xA | yA) */
- 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;
+ err = crypto_shash_init(desc);
+ if (err)
+ goto out_deinit_ec;
- sm3_final(&sctx, dgst);
- return 0;
+ err = crypto_shash_update(desc, entl, 2);
+ if (err)
+ goto out_deinit_ec;
+
+ err = crypto_shash_update(desc, SM2_DEFAULT_USERID,
+ SM2_DEFAULT_USERID_LEN);
+ if (err)
+ goto out_deinit_ec;
+
+ err = 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);
+ if (err)
+ goto out_deinit_ec;
+
+ err = crypto_shash_final(desc, dgst);
+
+out_deinit_ec:
+ sm2_ec_ctx_deinit(ec);
+out_free_ec:
+ kfree(ec);
+ return err;
}
-EXPORT_SYMBOL(sm2_compute_z_digest);
+EXPORT_SYMBOL_GPL(sm2_compute_z_digest);
static int _sm2_verify(struct mpi_ec_ctx *ec, MPI hash, MPI sig_r, MPI sig_s)
{
@@ -391,6 +417,14 @@ static int sm2_set_pub_key(struct crypto_akcipher *tfm,
const void *key, unsigned int keylen)
{
struct mpi_ec_ctx *ec = akcipher_tfm_ctx(tfm);
+
+ return __sm2_set_pub_key(ec, key, keylen);
+
+}
+
+static int __sm2_set_pub_key(struct mpi_ec_ctx *ec,
+ const void *key, unsigned int keylen)
+{
MPI a;
int rc;
diff --git a/include/crypto/public_key.h b/include/crypto/public_key.h
index 653992a6e941..8fadd561c50e 100644
--- a/include/crypto/public_key.h
+++ b/include/crypto/public_key.h
@@ -48,8 +48,6 @@ struct public_key_signature {
const char *pkey_algo;
const char *hash_algo;
const char *encoding;
- const void *data;
- unsigned int data_size;
};
extern void public_key_signature_free(struct public_key_signature *sig);
diff --git a/include/crypto/sm2.h b/include/crypto/sm2.h
index af452556dcd4..7094d75ed54c 100644
--- a/include/crypto/sm2.h
+++ b/include/crypto/sm2.h
@@ -11,15 +11,9 @@
#ifndef _CRYPTO_SM2_H
#define _CRYPTO_SM2_H
-#include <crypto/sm3.h>
-#include <crypto/akcipher.h>
+struct shash_desc;
-/* The default user id as specified in GM/T 0009-2012 */
-#define SM2_DEFAULT_USERID "1234567812345678"
-#define SM2_DEFAULT_USERID_LEN 16
-
-extern int sm2_compute_z_digest(struct crypto_akcipher *tfm,
- const unsigned char *id, size_t id_len,
- unsigned char dgst[SM3_DIGEST_SIZE]);
+int sm2_compute_z_digest(struct shash_desc *desc,
+ const void *key, unsigned int keylen, void *dgst);
#endif /* _CRYPTO_SM2_H */
