Serpent and Twofish library C

Question

I need to cipher an array of unsigned char (16 byte long) with Serpent and Twofish. I use two libraries -write in c- from the official website. I try to use them, but the ciphertext that i will obtain isn’t correct. For checking I use this site. I don't understand where is the mistake.
My code is:

keyInstance keyTwofish;
cipherInstance cipherTwofish;
unsigned char *buffer_out_twofish;

char path_file_twofish[DIM];
...
//Twofish
if(cipherInit(&cipherTwofish,MODE_ECB,NULL)!=TRUE)
{
   perror("[ERROR] Function module02: makeKey.\n");
   return 0;
}
//key_dim*8=128 and key is an unsigned char key [16] that contain key
makeKey(&keyTwofish, DIR_ENCRYPT, key_dim*8, key);
…
//Buffer in is unsigned char buffer_in[16] contain plaintext
//byte_for_file=16 than byte_for_file*8=128
//Buffer out is unsigned char buffer_out_twofish[16]
blockEncrypt(&cipherTwofish, &keyTwofish, buffer_in, byte_for_file*8, buffer_out_twofish);

For Serpent is the same implementation.

When I print a sizeof of variable’s type the result is:

Size of Char: 1
Size of Integer: 4
Size of Long: 8

And when I do:

printf("\nPrint Char Array: ");
for (int j = 0; j < byte_for_file; ++j)
   printf("%x ", buffer_in[j]);
printf("\nPrint long Array: ");
test(buffer_in, byte_for_file);

where

void test (unsigned long * a, int b)
{
   for (int i = 0; i < b/sizeof(long); ++i)
      printf("%lx ", a[i]);
}

I get this:

Print Char Array: 87 ae bd 58 71 75 1d 36 43 ab 1d ef 69 f5 54 d7 
Print long Array: 361d757158bdae87 d754f569ef1dab43 

Answer 1

The Implementation you use expects a key as keyLen/4 ASCII characters representing the hex values for the key.

So you should change the line:

makeKey(&keyTwofish, DIR_ENCRYPT, key_dim*8, key);

into

makeKey(&keyTwofish, DIR_ENCRYPT, strlen(key)*4, key);

Because Hexvalues like eg. 0x30313233343536373839 are not interpreted as 0123456789 but as 0x0300030103020303030403050306030703080309 and the Key 0123456789 would be interpreted as 0x00010203040506070809.