centos 7
crypto weakness #317

Weakness Breakdown

Definition:

This weakness involves creating non-standard or non-tested algorithms, using weak algorithms or applying cryptographic algorithms incorrectly. Algorithms that were once considered safe are commonly later found to be unsafe, as the algorithms were broken.

Warning code(s):

The crypt functions use a poor one-way hashing algorithm; since they only accept passwords of 8 characters or fewer and only a two-byte salt, they are excessively vulnerable to dictionary attacks given today's faster computing equipment.

File Name:

nettle-2.7.1/testsuite/des-compat-test.c

Context:

The highlighted line of code below is the trigger point of this particular Centos 7 crypto weakness.

 	for (i=0; i<4; i++)
		{
		printf(" %d",i);
		des_ncbc_encrypt( (des_cblock *) &(cbc_out[i]), (des_cblock *) cbc_in,
			sizeof(cbc_data), ks, &cbc_iv,
			DES_ENCRYPT);
		}
	printf("\noutput word alignment test");
	for (i=0; i<4; i++)
		{
		printf(" %d",i);
		des_ncbc_encrypt( (des_cblock *) cbc_out, (des_cblock *) &(cbc_in[i]),
			sizeof(cbc_data), ks, &cbc_iv,
			DES_ENCRYPT);
		}
	printf("\n");

	printf("fast crypt test ");
	str=crypt("testing","ef");
	if (strcmp("efGnQx2725bI2",str) != 0)
		{
		printf("fast crypt error, %s should be efGnQx2725bI2\n",str);
		err=1;
		}
	str=crypt("bca76;23","yA");
	if (strcmp("yA1Rp/1hZXIJk",str) != 0)
		{
		printf("fast crypt error, %s should be yA1Rp/1hZXIJk\n",str);
		err=1;
		}
	printf("\n");
#endif
	ASSERT (err == 0);
	}

static char *pt(const unsigned char *p)
	{
	static char bufs[10][20];
	static int bnum=0;
	char *ret;
	int i;
	static const char *f="0123456789ABCDEF";

	ret= &(bufs[bnum++][0]);
	bnum%=10;
	for (i=0; i<8; i++)
		{
		ret[i*2]=f[(p[i]>>4)&0xf];
		ret[i*2+1]=f[p[i]&0xf];
		}