[英]Stack around variable was corrupted
我有以下程序,其中使用256位密鑰長度的AES_CBC加密和解密給定的文本。 我想知道為什么當plaintext
, ciphertext
和checktext
plaintext
不是全局變量並且在它們正常工作時標題出現錯誤。 謝謝!
#include <stdio.h>
#include <openssl\aes.h>
#include <openssl\rand.h>
#include <conio.h>
#include <openssl\des.h>
#define BIG_TEST_SIZE 1024
char plaintext[BIG_TEST_SIZE];
char ciphertext[BIG_TEST_SIZE];
char checktext[BIG_TEST_SIZE];
AES_KEY key;
char rkey[32+1];
static void hexdump(FILE *f,const char *title,const unsigned char *s,int l)
{
int n=0;
fprintf(f,"%s",title);
for( ; n < l ; ++n)
{
if((n%16) == 0)
fprintf(f,"\n%04x",n);
fprintf(f," %02x",s[n]);
}
fprintf(f,"\n");
}
int main(int argc, char* argv[])
{
//char plaintext[BIG_TEST_SIZE];
//char ciphertext[BIG_TEST_SIZE];
//char checktext[BIG_TEST_SIZE];
char saved_iv[32+1];
int err = 0;
RAND_pseudo_bytes((unsigned char*)rkey, sizeof rkey);
unsigned char iv[32+1]="01234567890123456789012345678901";
memcpy(saved_iv, iv, sizeof saved_iv);
strcpy((char*)plaintext,"aaa");
const size_t encslength = ((strlen(plaintext) + AES_BLOCK_SIZE) / AES_BLOCK_SIZE) * AES_BLOCK_SIZE;
// Straight encrypt
AES_set_encrypt_key((unsigned char*)rkey, 256, &key);
hexdump(stdout, "plaintext", (unsigned char*)plaintext, strlen(plaintext));
AES_cbc_encrypt((unsigned char*)plaintext, (unsigned char*)ciphertext, encslength, &key, (unsigned char*)iv,AES_ENCRYPT);
hexdump(stdout, "ciphertext", (unsigned char*)ciphertext, strlen(plaintext));
// Straight decrypt
AES_set_decrypt_key((unsigned char*)rkey, 256, &key);
memcpy(iv, saved_iv, sizeof iv);
AES_cbc_encrypt((unsigned char*)ciphertext, (unsigned char*)checktext, encslength, &key, (unsigned char*)iv,AES_DECRYPT);
hexdump(stdout, "checktext", (unsigned char*)checktext, strlen(plaintext));
getch();
}
全局變量和靜態變量初始化為零,而局部變量不是。 因此,當您在本地定義明文 , 密文和校驗 文本時 ,請使用memset將其初始化為零。 您的字符串應以null終止,但對於您而言則不是。 ciphertext , checktext不能為null終止。 而純文本由於strcpy調用而終止為null。
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