函数的隐式声明 'BN_init' 错误

Question

我正在检查如何从私人比特币地址生成 public 密钥。
我找到了以下页面：
How do I obtain the public key from an ECDSA private key in OpenSSL?

但是当我尝试使用 gcc -Wall -Werror -O3 -o public_key public_key.c -lcrypto 进行编译时，出现以下错误：

public_key.c: In function 'generate_pubic_key':
public_key.c:26:13: error: storage size of 'start' isn't known
      BIGNUM start;
             ^~~~~
public_key.c:32:6: error: implicit declaration of function 'BN_init' [-Werror=implicit-function-declaration]
      BN_init(&start);
      ^~~~~~~
public_key.c:26:13: error: unused variable 'start' [-Werror=unused-variable]
      BIGNUM start;
             ^~~~~
cc1: all warnings being treated as errors

我已经安装了 OpenSSL，并且直到现在还没有遇到任何与之相关的编程错误。有人可以指出我做错了什么吗？

Answer 1

您正在使用 ~~已弃用~~ 已删除 API。

根据 BN_new(3) 手册页：

删除的功能 void BN_init(BIGNUM *);

BN_init() is no longer available as of OpenSSL 1.1.0. It was used to initialize an existing uninitialized BIGNUM. Typically this would be done as follows:
 BIGNUM a;
 BN_init(&a);
Applications should replace use of BN_init with BN_new instead:
 BIGNUM *a;
 a = BN_new();
 if(!a) /* Handle error */
 ...
 BN_free(a);

函数的隐式声明 'BN_init' 错误

Implicit declaration of function 'BN_init' error

c

openssl

bitcoin