olemorud/vigenere-cracker
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Make all functions static and fix formatting

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Ole Morud
2024-09-05 04:40:16 +02:00
parent d81cbab314
commit 9bae0ee76d
1 changed files with 9 additions and 5 deletions
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14
crack-vigenere.c
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@@ -45,7 +45,7 @@ static double charfreq_english[sizeof charset] = {
['Z' - 'A'] = 0.00074, ['Z' - 'A'] = 0.00074,
}; };
int do_nothing(int ch) static int do_nothing(int ch)
{ {
return ch; return ch;
} }
@@ -70,7 +70,7 @@ static size_t charset_index(char ch)
* ioc(data, ..., tolower) will transform samples with tolower before checking * ioc(data, ..., tolower) will transform samples with tolower before checking
* if they are equal * if they are equal
* */ * */
double ioc(struct str text, int stride, int offset, int (*map)(int)) static double ioc(struct str text, int stride, int offset, int (*map)(int))
{ {
assert(offset < stride); assert(offset < stride);
if (stride > text.len) { if (stride > text.len) {
@@ -182,7 +182,6 @@ int main(int argc, char** argv)
/* Find key length (stride) /* Find key length (stride)
* ========================*/ * ========================*/
int key_len = 1; int key_len = 1;
{ {
/* values better than threshold immidiately break the loop */ /* values better than threshold immidiately break the loop */
@@ -222,7 +221,7 @@ int main(int argc, char** argv)
for (size_t i = 0; i < sizeof charset; i++) { for (size_t i = 0; i < sizeof charset; i++) {
double n = frequency_correlation(frequencies, charfreq_english, i); double n = frequency_correlation(frequencies, charfreq_english, i);
if (n > best) { if (n > best) {
key[col] = sizeof charset - i; key[col] = (sizeof charset - i) % sizeof charset;
best = n; best = n;
} }
} }
@@ -234,11 +233,16 @@ int main(int argc, char** argv)
for (size_t i = 0; i < key_len; i++) { for (size_t i = 0; i < key_len; i++) {
printf("%c", charset[key[i]]); printf("%c", charset[key[i]]);
} }
printf(" (");
for (size_t i = 0; i < key_len - 1; i++) {
printf("%d, ", key[i]);
}
printf("%d)", key[key_len - 1]);
printf("\n"); printf("\n");
vigenere_decode(text, text.data, key, key_len, charset, sizeof charset); vigenere_decode(text, text.data, key, key_len, charset, sizeof charset);
str_println(text, stdout); //str_println(text, stdout);
str_free(&text); str_free(&text);