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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* asymmetric public-key algorithm for SM2-with-SM3 certificate
* as specified by OSCCA GM/T 0003.1-2012 -- 0003.5-2012 SM2 and
* described at https://tools.ietf.org/html/draft-shen-sm2-ecdsa-02
*
* Copyright (c) 2020, Alibaba Group.
* Authors: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
*/
#include <crypto/sm3_base.h>
#include <crypto/sm2.h>
#include <crypto/public_key.h>
#if IS_REACHABLE(CONFIG_CRYPTO_SM2)
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);
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;
}
#endif /* ! IS_REACHABLE(CONFIG_CRYPTO_SM2) */
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