2016-04-13 124 views
0

我的C程序使用RSA_genarate_key()函數創建RSA公鑰和私鑰。然後使用i2d_RSA_PUBKEY()將公鑰轉換爲DER格式後保存在文件中。OpenSSL d2i_RSA_PUBKEY導致分段錯誤

文件與公鑰似乎是確定當我嘗試讀回,並用它來加密

openssl rsa -in public.der -inform DER -pubin -text //shows up as below 

Public-Key: (2048 bit) 
Modulus: 
    00:b5:99:9a:d3:7e:.... 
    .......39:86:6b:ae:29 
Exponent: 3 (0x3) 
writing RSA key 
-----BEGIN PUBLIC KEY----- 
MIIBIDANBgkqhkiG9............. 
....................+1Y5lSk5hmuu 
KQIBAw== 
-----END PUBLIC KEY----- 

問題出現。下面是代碼:

File* fp; 
RSA *pub=NULL; 
const unsigned char* public_key_buf; 
int size; 
fp = fopen("public.der","r"); 
fseek (fp , 0 , SEEK_END); 
size = ftell (fp); 
size = sizeof(char)*size; 
rewind (fp); 
public_key_buf = malloc(size*sizeof(char)); 
fread(&public_key_buf,sizeof(char),size,fp); 

pub = d2i_RSA_PUBKEY(0, &public_key_buf, size); 

fclose(fp); 

正在運行的程序會導致Segmentation fault

這裏是GDB說什麼:

Program received signal SIGSEGV, Segmentation fault. 
0x00007ffff7b0fe85 in ASN1_get_object() 
from /lib/x86_64-linux-gnu/libcrypto.so.1.0.0 
(gdb) bt 
#0 0x00007ffff7b0fe85 in ASN1_get_object() from /lib/x86_64-linux-gnu/libcrypto.so.1.0.0 
#1 0x00007ffff7b05f30 in ??() from /lib/x86_64-linux- gnu/libcrypto.so.1.0.0 
#2 0x00007ffff7b071ad in ASN1_item_ex_d2i() from /lib/x86_64-linux-gnu/libcrypto.so.1.0.0 
#3 0x00007ffff7b07914 in ASN1_item_d2i() from /lib/x86_64-linux-gnu/libcrypto.so.1.0.0 
#4 0x00007ffff7affa3e in d2i_PUBKEY() from /lib/x86_64-linux-gnu/libcrypto.so.1.0.0 
#5 0x00007ffff7affb14 in d2i_RSA_PUBKEY() from /lib/x86_64-linux-gnu/libcrypto.so.1.0.0 
#6 0x0000000000400daa in main() at rsa_1.c:99 

(gdb) p pub 
$1 = (RSA *) 0x0 
(gdb) p public_key_buf 
$2 = (const unsigned char **) 0x603250 
(gdb) p *public_key_buf 
$3 = (const unsigned char *) 0x9060d3020018230 <error: Cannot access memory at address 0x9060d3020018230> 
(gdb) p size 
$4 = 293 

任何幫助,請。

+0

你的代碼不會在C++編譯器上編譯,那你爲什麼要標記C++? –

+0

對不起,「mea culpa」,再也不會。但是,有什麼建議呢? – michal

回答

-2

如果你仔細觀察的簽名d2i_RSA_PUBKEY()

RSA *d2i_RSA_PUBKEY(RSA **a, const unsigned char **pp, long length) 

你爲什麼要填寫的第一個參數爲0,而不是空?

它不應該是這樣的東西?

pub = d2i_RSA_PUBKEY(NULL, &public_key_buf, size); 

讓我知道這是否工作?

+1

C 101:'0'和'NULL'都是C中的空指針常量。 –