Coverage Report

Created: 2025-06-13 06:58

/src/openssl31/crypto/sm2/sm2_key.c
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/*
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 * Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved.
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 *
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 * Licensed under the Apache License 2.0 (the "License").  You may not use
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 * this file except in compliance with the License.  You can obtain a copy
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 * in the file LICENSE in the source distribution or at
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 * https://www.openssl.org/source/license.html
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 */
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#include "internal/deprecated.h" /* to be able to use EC_KEY and EC_GROUP */
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#include <openssl/err.h>
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#include "crypto/sm2err.h"
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#include "crypto/sm2.h"
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#include <openssl/ec.h> /* EC_KEY and EC_GROUP functions */
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/*
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 * SM2 key generation is implemented within ec_generate_key() in
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 * crypto/ec/ec_key.c
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 */
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int ossl_sm2_key_private_check(const EC_KEY *eckey)
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{
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    int ret = 0;
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    BIGNUM *max = NULL;
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    const EC_GROUP *group = NULL;
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    const BIGNUM *priv_key = NULL, *order = NULL;
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    if (eckey == NULL
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            || (group = EC_KEY_get0_group(eckey)) == NULL
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            || (priv_key = EC_KEY_get0_private_key(eckey)) == NULL
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            || (order = EC_GROUP_get0_order(group)) == NULL ) {
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        ERR_raise(ERR_LIB_SM2, ERR_R_PASSED_NULL_PARAMETER);
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        return 0;
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    }
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    /* range of SM2 private key is [1, n-1) */
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    max = BN_dup(order);
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    if (max == NULL || !BN_sub_word(max, 1))
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0
        goto end;
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    if (BN_cmp(priv_key, BN_value_one()) < 0
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        || BN_cmp(priv_key, max) >= 0) {
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        ERR_raise(ERR_LIB_SM2, SM2_R_INVALID_PRIVATE_KEY);
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        goto end;
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    }
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    ret = 1;
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 end:
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    BN_free(max);
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    return ret;
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}