gcc文件.c -o文件-l wolfssl错误：“密钥”的存储大小未知

Question

#include <stdio.h> 
#include <stdlib.h> 
#include <unistd.h> 
#include <wolfssl/ssl.h> 
#include <wolfssl/wolfcrypt/types.h> 
#include <wolfssl/wolfcrypt/random.h> 
#include <wolfssl/wolfcrypt/ecc.h> 
#include <wolfssl/wolfcrypt/rsa.h> 
int mian(int argc,char *arfv[]){ 
ecc_key key; 
wc_ecc_init(&key); 
WC_RNG rng; 
wc_InitRng(&rng);
int ret =1; 
ret = wc_ecc_make_key(&rng,32,&key);
printf("%d\n",ret); 
} 

在这里输入图像描述错误:不知道“密钥”的存储大小，我已经包含了ecc.h文件，为什么不知道“密钥”的存储大小？

Answer 1

解决方案:确保在任何其他wolfSSL头之前包括库配置设置。wolfSSL可以通过以下任意一种配置：

• <wolfssl/options.h> (当使用步骤./configure && make构建wolfSSL时自动生成的文件)
• <wolfssl/wolfcrypt/settings.h>和用户可以全局定义WOLFSSL_USER_SETTINGS来创建自己的user_settings.h头，以“调优”构建设置。在全局定义user_settings.h时，<wolfssl/wolfcrypt/settings.h>将包含WOLFSSL_USER_SETTINGS头。

无论哪种方式，库配置都需要包括在所有其他wolfSSL头之前！

类似的错误再现(编译器版本可能因消息显示而异，我的没有说“密钥的存储大小是未知的”，但我的输出看起来非常类似于您的屏幕快照)。

$ gcc stackoverflow.c -o run -I/Users/kalebhimes/work/testDir/wolf-install-dir-for-testing/include -L/Users/kalebhimes/work/testDir/wolf-install-dir-for-testing/lib -lwolfssl
In file included from stackoverflow.c:4:
In file included from /Users/kalebhimes/work/testDir/wolf-install-dir-for-testing/include/wolfssl/ssl.h:33:
/Users/kalebhimes/work/testDir/wolf-install-dir-for-testing/include/wolfssl/wolfcrypt/settings.h:2348:14: warning: "For timing resistance / side-channel attack prevention consider using harden options" [-W#warnings]
            #warning "For timing resistance / side-channel attack prevention consider using harden options"
             ^
stackoverflow.c:10:9: error: variable has incomplete type 'ecc_key' (aka 'struct ecc_key')
ecc_key key; 
        ^
/Users/kalebhimes/work/testDir/wolf-install-dir-for-testing/include/wolfssl/wolfcrypt/asn_public.h:43:20: note: forward declaration of 'struct ecc_key'
    typedef struct ecc_key ecc_key;
                   ^
stackoverflow.c:11:1: error: implicit declaration of function 'wc_ecc_init' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
wc_ecc_init(&key); 
^
stackoverflow.c:15:7: error: implicit declaration of function 'wc_ecc_make_key' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
ret = wc_ecc_make_key(&rng,32,&key);
      ^
1 warning and 3 errors generated.

修正了这个补丁：

--- stackoverflow.c.orig    2022-11-17 08:33:50.000000000 -0700
+++ stackoverflow.c 2022-11-17 08:36:04.000000000 -0700
@@ -1,12 +1,18 @@
 #include <stdio.h> 
 #include <stdlib.h> 
 #include <unistd.h> 
+// Added the library configuration BEFORE including other wolfSSL headers
+// Alternatively include <wolfssl/wolfcrypt/settings.h> if the library was not
+// built with ./configure && make (which auto-generates options.h)
+#include <wolfssl/options.h> 
 #include <wolfssl/ssl.h> 
 #include <wolfssl/wolfcrypt/types.h> 
 #include <wolfssl/wolfcrypt/random.h> 
 #include <wolfssl/wolfcrypt/ecc.h> 
 #include <wolfssl/wolfcrypt/rsa.h> 
-int mian(int argc,char *arfv[]){ 
+// main was mis-spelled :-)
+//int mian(int argc,char *arfv[]){ 
+int main(int argc,char *arfv[]){ 
 ecc_key key; 
 wc_ecc_init(&key); 
 WC_RNG rng;

现在，应用程序成功运行！干杯。