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| author | Nicholas Tay <nick@windblume.net> | 2021-11-30 21:44:20 +1100 |
|---|---|---|
| committer | Nicholas Tay <nick@windblume.net> | 2021-11-30 21:44:20 +1100 |
| commit | c0986a09b7aa8eee49e207ecafb9ce88677dd84b (patch) | |
| tree | ed175b3886b916056bbfaf84bd511c553dafa186 /passgen.c | |
| download | passgen-c0986a09b7aa8eee49e207ecafb9ce88677dd84b.tar.gz passgen-c0986a09b7aa8eee49e207ecafb9ce88677dd84b.tar.bz2 passgen-c0986a09b7aa8eee49e207ecafb9ce88677dd84b.zip | |
Initial passgen with no customisable grammar
Diffstat (limited to 'passgen.c')
| -rw-r--r-- | passgen.c | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/passgen.c b/passgen.c new file mode 100644 index 0000000..f4f8960 --- /dev/null +++ b/passgen.c @@ -0,0 +1,66 @@ +#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <time.h>
+#include <unistd.h>
+
+#define DEFAULT_GRAMMAR "Cvccvc!##"
+
+// i, o excluded due to potentially confusing 1/l/i + 0/o
+#define VOWELS "aeuy"
+#define CONSONANTS "bcdfghkmnprstvwxz"
+#define NUMBERS "1234567890"
+#define SYMBOLS "@#$%^&*_-+=()[]{}"
+
+int main(int argc, char *argv[])
+{
+ char *grammar = DEFAULT_GRAMMAR;
+ int grammar_size = sizeof(DEFAULT_GRAMMAR)-1;
+
+ char password[grammar_size];
+
+ // seed RNG; this isn't very good, but it's enough
+ srand(time(NULL) << 2 + getpid() % 420 - 69);
+
+ for (int i = 0; i < grammar_size; ++i) {
+ char c = grammar[i];
+
+ bool caps = false;
+ if (c >= 'A' && c <= 'Z') {
+ caps = true;
+ c += 'a' - 'A';
+ }
+
+ char *class;
+ int class_size = 0;
+#define setClass(cl) \
+ class = cl; \
+ class_size = sizeof(cl)-1;
+
+ switch (c) {
+ case 'c':
+ setClass(CONSONANTS);
+ break;
+ case 'v':
+ setClass(VOWELS);
+ break;
+ case '!':
+ setClass(SYMBOLS);
+ break;
+ case '#':
+ setClass(NUMBERS);
+ break;
+ default:
+ printf("ERROR: Invalid grammar character '%C'.\n", c);
+ return 1;
+ }
+
+ do {
+ password[i] = class[rand() % class_size] - (caps ? 'a' - 'A' : 0);
+ } while (i != 0 && password[i] == password[i-1]);
+ }
+
+ printf("%s\n", password);
+
+ return 0;
+}
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