diff options
Diffstat (limited to 'lib/extras/randomart.c')
| -rw-r--r-- | lib/extras/randomart.c | 203 |
1 files changed, 101 insertions, 102 deletions
diff --git a/lib/extras/randomart.c b/lib/extras/randomart.c index 7b661a9a25..3b7bf8adc9 100644 --- a/lib/extras/randomart.c +++ b/lib/extras/randomart.c @@ -61,107 +61,106 @@ #define FLDBASE 8 #define FLDSIZE_Y (FLDBASE + 1) #define FLDSIZE_X (FLDBASE * 2 + 1) -char * -_gnutls_key_fingerprint_randomart (uint8_t * dgst_raw, u_int dgst_raw_len, - const char *key_type, unsigned int key_size, - const char* prefix) +char *_gnutls_key_fingerprint_randomart(uint8_t * dgst_raw, + u_int dgst_raw_len, + const char *key_type, + unsigned int key_size, + const char *prefix) { - /* - * Chars to be used after each other every time the worm - * intersects with itself. Matter of taste. - */ - const char augmentation_string[] = " .o+=*BOX@%&#/^SE"; - char *retval, *p; - uint8_t field[FLDSIZE_X][FLDSIZE_Y]; - unsigned int i, b; - int x, y; - const size_t len = sizeof(augmentation_string) - 2; - unsigned int prefix_len = 0; - - if (prefix) - prefix_len = strlen(prefix); - - retval = gnutls_calloc (1, (FLDSIZE_X + 3 + prefix_len) * (FLDSIZE_Y + 2)); - if (retval == NULL) - { - gnutls_assert(); - return NULL; - } - - /* 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 = MAX (x, 0); - y = MAX (y, 0); - x = MIN (x, FLDSIZE_X - 1); - y = 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 (prefix_len) - snprintf (retval, FLDSIZE_X + prefix_len, "%s+--[%4s %4u]", prefix, key_type, key_size); - else - snprintf (retval, FLDSIZE_X, "+--[%4s %4u]", key_type, key_size); - p = strchr (retval, '\0'); - - /* output upper border */ - for (i = p - retval - 1; i < FLDSIZE_X + prefix_len; i++) - *p++ = '-'; - *p++ = '+'; - *p++ = '\n'; - - if (prefix_len) - { - memcpy(p, prefix, prefix_len); - p += prefix_len; - } - - /* output content */ - for (y = 0; y < FLDSIZE_Y; y++) - { - *p++ = '|'; - for (x = 0; x < FLDSIZE_X; x++) - *p++ = augmentation_string[MIN (field[x][y], len)]; - *p++ = '|'; - *p++ = '\n'; - - if (prefix_len) - { - memcpy(p, prefix, prefix_len); - p += prefix_len; - } - } - - /* output lower border */ - *p++ = '+'; - for (i = 0; i < FLDSIZE_X; i++) - *p++ = '-'; - *p++ = '+'; - - return retval; + /* + * Chars to be used after each other every time the worm + * intersects with itself. Matter of taste. + */ + const char augmentation_string[] = " .o+=*BOX@%&#/^SE"; + char *retval, *p; + uint8_t field[FLDSIZE_X][FLDSIZE_Y]; + unsigned int i, b; + int x, y; + const size_t len = sizeof(augmentation_string) - 2; + unsigned int prefix_len = 0; + + if (prefix) + prefix_len = strlen(prefix); + + retval = + gnutls_calloc(1, + (FLDSIZE_X + 3 + prefix_len) * (FLDSIZE_Y + 2)); + if (retval == NULL) { + gnutls_assert(); + return NULL; + } + + /* 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 = MAX(x, 0); + y = MAX(y, 0); + x = MIN(x, FLDSIZE_X - 1); + y = 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 (prefix_len) + snprintf(retval, FLDSIZE_X + prefix_len, "%s+--[%4s %4u]", + prefix, key_type, key_size); + else + snprintf(retval, FLDSIZE_X, "+--[%4s %4u]", key_type, + key_size); + p = strchr(retval, '\0'); + + /* output upper border */ + for (i = p - retval - 1; i < FLDSIZE_X + prefix_len; i++) + *p++ = '-'; + *p++ = '+'; + *p++ = '\n'; + + if (prefix_len) { + memcpy(p, prefix, prefix_len); + p += prefix_len; + } + + /* output content */ + for (y = 0; y < FLDSIZE_Y; y++) { + *p++ = '|'; + for (x = 0; x < FLDSIZE_X; x++) + *p++ = augmentation_string[MIN(field[x][y], len)]; + *p++ = '|'; + *p++ = '\n'; + + if (prefix_len) { + memcpy(p, prefix, prefix_len); + p += prefix_len; + } + } + + /* output lower border */ + *p++ = '+'; + for (i = 0; i < FLDSIZE_X; i++) + *p++ = '-'; + *p++ = '+'; + + return retval; } |