pass/gen: init

1 files changed, 36 insertions, 0 deletions

diff --git a/src/libnpass/libnpass.c b/src/libnpass/libnpass.c
index 9158c62..25b707f 100644
--- a/src/libnpass/libnpass.c
+++ b/src/libnpass/libnpass.c
@@ -18,6 +18,17 @@
 #define FPR_MAX		256
 
 static char pass_dir[PATH_MAX] = {0};
+const char *pass_gen_set[] = {
+	"0123456789",
+
+	"0123456789"
+	"abcdefghijklmnopqrstuvwxyz"
+	"ABCDEFGHIJKLMNOPQRSTUVWXYZ",
+
+	"0123456789"
+	"abcdefghijklmnopqrstuvwxyz"
+	"!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~",
+};
 
 int set_pass_dir(void);
 
@@ -123,6 +134,31 @@ ssize_t pass_getpass(char **lineptr, size_t *n, FILE *stream)
 	return r;
 }
 
+int pass_gen(pass_gen_t gen, char *pass, size_t n)
+{
+	int r;
+	FILE *rand;
+	size_t  pass_gen_len;
+
+
+	if (n <= 0)
+		err_ret(1, "small password");
+
+	rand = fopen("/dev/urandom", "r");
+	if (!rand)
+		err_ret(1, "%s", strerror(errno));
+
+	r = fread(pass, sizeof(pass[0]), n, rand);
+	if (r != (int) n)
+		err_ret(1, "fread failed");
+
+	pass_gen_len = strlen(pass_gen_set[gen]);
+	for (size_t i = 0; i < n; i++)
+		pass[i] = pass_gen_set[gen][pass[i] % (pass_gen_len - 1)];
+
+	return 0;
+}
+
 int pass_add(const char *path, const char *pass, size_t n)
 {
 	int r;