#include <openssl/des.h>
#include <string.h>
#include <ctype.h>
#define ENC 1
#define DEC 0
int isDecryption(char inputFile[]);
void translate(unsigned char *dest, char *src);
int allHex(char input[]);
int main(int argc, char *argv[])
{
if (argc != 5)
{
printf("Incorrect number of arguments\n");
return -1;
}
if (allHex(argv[1]) == 0)
{
printf("IV field contains non-hex characters\n");
return -1;
}
if (allHex(argv[2]) == 0)
{
printf("key field contains non-hex characters\n");
return -1;
}
FILE *fIn;
FILE *fOut;
fIn=fopen(argv[3],"r");
fOut=fopen(argv[4],"w");
if (fIn == NULL)
{
printf("Bad input file!\n");
return -1;
}
if (fOut == NULL)
{
printf("Bad output file!");
return -1;
}
int decrypt = isDecryption(argv[3]);
int k;
//int i = 0;
DES_LONG block[2];
DES_LONG oldBlock[2];
DES_LONG tempBlock[2];
if (strlen(argv[2]) != 16)
{
printf("key is not the right length\n");
return -1;
}
unsigned char *cbc_key;
cbc_key = malloc(sizeof(argv[2]));
translate(cbc_key, argv[2]);
if (strlen(argv[1]) != 16)
{
printf("iv is not the right length\n");
return -1;
}
unsigned char *temp;
temp = malloc(sizeof(argv[1]));
translate(temp, argv[1]);
memcpy(oldBlock, temp, 8);
DES_key_schedule key;
//printf("%d-%s\n", strlen(cbc_key),cbc_key);
//DES_cblock*
if ((k = DES_set_key_checked((C_Block*)&cbc_key,&key)) != 0)
printf("\nkey error\n%d\n",k);
k = fread(block, 2, 32, fIn);
//printf("%d",k);
while (k == 2)
{
if (decrypt == 1)
{
DES_encrypt1(block, &key, DEC);
}
//XOR with the old block
tempBlock[0] = block[0] ^ oldBlock[0];
tempBlock[1] = block[1] ^ oldBlock[1];
//encrypt block
if (decrypt == 0)
{
DES_encrypt1(tempBlock, &key, ENC);
}
//oldblock = block
memcpy(oldBlock, tempBlock, 8);
//read block from file
k = fread(&block, 1, sizeof(block), fIn);
//write result to fOut
fwrite(&tempBlock, 1, sizeof(tempBlock), fOut);
}
fclose(fIn);
fclose(fOut);
//printf("DES Clear Text: %ld%ld\n",in[0],in[1]);
//des_encrypt1(in,key,ENC);
//printf("DES Encryption: %u%u\n",in[0],in[1]);
//des_encrypt1(in,key,DEC);
}
void translate(unsigned char *dest, char *src)
{
int i = 0;
int j = 0;
unsigned char t = 0;
while(i < strlen(src))
{
if (isdigit(src[i]))
{
t = t + src[i] - '0';
} else if (isupper(src[i])) {
t = t + src[i] - 'A' + 10;
} else if (islower(src[i])) {
t = t + src[i] - 'a' + 10;
}
if (i % 2 == 0)
{
//multiply t by 16
t = t * 16;
} else {
// store in dest[j]
dest[j] = t;
t = 0;
j++;
}
i++;
}
}
//if file extension is .des returns true, other returns false
int isDecryption(char inputFile[])
{
int l = strlen(inputFile);
if ((inputFile[l-1] == 's') && (inputFile[l-2] == 'e') &&
(inputFile[l-3]
== 'd') && (inputFile[l-3] == '.'))
{
return 1;
} else {
return 0;
}
}
//returns false if any chars are not 0-1 or a-f
int allHex(char input[])
{
int l = strlen(input)-1;
int t = 0;
while(l >= 0)
{
t = (int)input[l];
if ((t < ((int)'0')) || (t > ((int)'z')))
{
return 0;
}
if ((t < ((int)'A')) && (t > ((int)'9')))
{
return 0;
}
if ((t < ((int)'a')) && (t > ((int)'Z')))
{
return 0;
}
l--;
}
return 1;
}
Cannot create key results in error to -1 and then segmentation fault on
giving the following input:
./des_cbc1 fecdba9876543210 0123456789abcdef test.txt test.des
Please respond ASAP!!
Thanks
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