mirror of
https://github.com/radareorg/radare2.git
synced 2024-12-17 02:06:55 +00:00
129 lines
3.7 KiB
C
129 lines
3.7 KiB
C
/*
|
|
* This code is originally taken from OpenSSH:
|
|
* http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/key.c?rev=1.75&content-type=text/x-cvsweb-markup
|
|
*/
|
|
|
|
/*
|
|
* Draw an ASCII-Art representing the fingerprint so human brain can
|
|
* profit from its built-in pattern recognition ability.
|
|
* This technique is called "random art" and can be found in some
|
|
* scientific publications like this original paper:
|
|
*
|
|
* "Hash Visualization: a New Technique to improve Real-World Security",
|
|
* Perrig A. and Song D., 1999, International Workshop on Cryptographic
|
|
* Techniques and E-Commerce (CrypTEC '99)
|
|
* sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
|
|
*
|
|
* The subject came up in a talk by Dan Kaminsky, too.
|
|
*
|
|
* If you see the picture is different, the key is different.
|
|
* If the picture looks the same, you still know nothing.
|
|
*
|
|
* The algorithm used here is a worm crawling over a discrete plane,
|
|
* leaving a trace (augmenting the field) everywhere it goes.
|
|
* Movement is taken from dgst_raw 2bit-wise. Bumping into walls
|
|
* makes the respective movement vector be ignored for this turn.
|
|
* Graphs are not unambiguous, because circles in graphs can be
|
|
* walked in either direction.
|
|
*/
|
|
|
|
/*
|
|
* Field sizes for the random art. Have to be odd, so the starting point
|
|
* can be in the exact middle of the picture, and FLDBASE should be >=8 .
|
|
* Else pictures would be too dense, and drawing the frame would
|
|
* fail, too, because the key type would not fit in anymore.
|
|
*/
|
|
#include <r_util.h>
|
|
|
|
#define FLDBASE 8
|
|
#define FLDSIZE_Y (FLDBASE + 1)
|
|
#define FLDSIZE_X (FLDBASE * 2 + 1)
|
|
|
|
//static char * key_fingerprint_randomart(ut8 *dgst_raw, ut32 dgst_raw_len) {
|
|
R_API char *r_print_randomart(const ut8 *dgst_raw, ut32 dgst_raw_len, ut64 addr) {
|
|
/*
|
|
* Chars to be used after each other every time the worm
|
|
* intersects with itself. Matter of taste.
|
|
*/
|
|
char *augmentation_string = " .o+=*BOX@%&#/^SE";
|
|
char *retval, *p;
|
|
ut8 field[FLDSIZE_X][FLDSIZE_Y];
|
|
ut32 i, b;
|
|
int x, y;
|
|
size_t len = strlen(augmentation_string) - 1;
|
|
|
|
// 2*(FLDSIZE_X+3) there are two for loops that iterate over this
|
|
// FLDSIZE_Y * (FLDSIZE_X+3) there is a loop that for each y iterates over the whole FLDSIZE_X
|
|
// The rest is counting the +--[0x%08"PFMT64x"]- and '\0'
|
|
retval = calloc (1, 2*(FLDSIZE_X+3) + (FLDSIZE_Y * (FLDSIZE_X+3))+ 7 + sizeof (PFMT64x));
|
|
|
|
/* initialize field */
|
|
memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char));
|
|
x = FLDSIZE_X / 2;
|
|
y = FLDSIZE_Y / 2;
|
|
|
|
/* process raw key */
|
|
for (i = 0; i < dgst_raw_len; i++) {
|
|
int input;
|
|
/* each byte conveys four 2-bit move commands */
|
|
input = dgst_raw[i];
|
|
for (b = 0; b < 4; b++) {
|
|
/* evaluate 2 bit, rest is shifted later */
|
|
x += (input & 0x1) ? 1 : -1;
|
|
y += (input & 0x2) ? 1 : -1;
|
|
|
|
/* assure we are still in bounds */
|
|
x = R_MAX(x, 0);
|
|
y = R_MAX(y, 0);
|
|
x = R_MIN(x, FLDSIZE_X - 1);
|
|
y = R_MIN(y, FLDSIZE_Y - 1);
|
|
|
|
/* augment the field */
|
|
if (field[x][y] < len - 2) {
|
|
field[x][y]++;
|
|
}
|
|
input = input >> 2;
|
|
}
|
|
}
|
|
|
|
/* mark starting point and end point*/
|
|
field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1;
|
|
field[x][y] = len;
|
|
|
|
/* fill in retval */
|
|
#if 0
|
|
snprintf(retval, FLDSIZE_X, "+--[%4s %4u]", key_type(k), key_size(k));
|
|
#else
|
|
//strcpy (retval, "+-------------");
|
|
sprintf (retval, "+--[0x%08"PFMT64x"]-", addr);
|
|
#endif
|
|
p = strchr(retval, '\0');
|
|
|
|
/* output upper border */
|
|
for (i = p - retval - 1; i < FLDSIZE_X; i++) {
|
|
*p++ = '-';
|
|
}
|
|
*p++ = '+';
|
|
*p++ = '\n';
|
|
|
|
/* output content */
|
|
for (y = 0; y < FLDSIZE_Y; y++) {
|
|
*p++ = '|';
|
|
for (x = 0; x < FLDSIZE_X; x++) {
|
|
*p++ = augmentation_string[R_MIN (field[x][y], len)];
|
|
}
|
|
*p++ = '|';
|
|
*p++ = '\n';
|
|
}
|
|
|
|
/* output lower border */
|
|
*p++ = '+';
|
|
for (i = 0; i < FLDSIZE_X; i++) {
|
|
*p++ = '-';
|
|
}
|
|
*p++ = '+';
|
|
*p++ = 0;
|
|
|
|
return retval;
|
|
}
|