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用PKCS7填充[C]

[英]padding with PKCS7 [C]

I want to do padding with PKCS7 : 我想用PKCS7进行填充:

char *test1 = "azertyuiopqsdfgh";
char *test2 = malloc(32*sizeof(char));

memcpy(test2, test1, strlen(test1));

char pad = (char)(32-strlen(test1));
printf("pad = %d\n", pad);

for(int i = strlen(test1) ; i < 32 ; i++) {
    test2[i] = pad;
}
for (int i = 0 ; i < 32 ; i++)
    printf("%x ", test2[i]);
printf("\n");

I obtain : 我得到:

pad = 16

61 7a 65 72 74 79 75 69 6f 70 71 73 64 66 67 68 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10

But i want : 但我想要 :

pad = 16

61 7a 65 72 74 79 75 69 6f 70 71 73 64 66 67 68 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16

How can i modify my code ? 我该如何修改我的代码?

Thanks in advance. 提前致谢。

With

printf("%x ", test2[i]);

You are printing in hexadecimal ( %x ) whereas with 您使用十六进制( %x )打印,而使用

printf("pad = %d\n", pad);` you are printing in decimal (%d). 

And (decimal) 16 => (hexa) 10 , So you are displaying the right thing. (十进制)16 =>(六)10 ,所以您正在显示正确的东西。

You could probably play a bit with your printing to display 16 instead of 10 but I don't think this is what you are searching for. 您可能会在打印中显示16而不是10,但是我认为这不是您要搜索的内容。

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