initial commit

Signed-off-by: Chloe M <chloe@faracom.org>

1 files changed, 132 insertions, 0 deletions

diff --git a/newpass/core/newpass.c b/newpass/core/newpass.c
new file mode 100644
index 0000000..93b481f
--- /dev/null
+++ b/newpass/core/newpass.c
@@ -0,0 +1,132 @@
+/*
+ * Copyright (c) 2026, Chloe M., et al.
+ * Provided under the BSD-3 clause.
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <assert.h>
+#include <unistd.h>
+
+static const char chrtab[] = {
+    "ab123cde987654321=0fghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWZYZ"
+    "!@#$%^&*()[]><?"
+};
+
+static void
+help(void)
+{
+    printf("usage: ./newpass [flags]\n");
+    printf("[-h]    Display this help menu\n");
+    printf("[-l]    Length of password to create\n");
+    printf("[-c]    Number of passwords to generate\n");
+}
+
+static void *
+xmalloc(size_t sz)
+{
+    void *buf;
+
+#ifdef __OpenBSD__
+    buf = malloc_conceal(sz);
+#else
+    buf = malloc(sz);
+#endif
+
+    assert(buf != NULL && "allocation failure");
+    return buf;
+}
+
+static uint8_t *
+randbytes(size_t count)
+{
+    int fd;
+    uint8_t *buf;
+    ssize_t nbyte;
+
+    buf = xmalloc(count);
+    fd = open("/dev/urandom", O_RDONLY);
+
+    if (fd < 0) {
+        perror("open");
+        free(buf);
+        return NULL;
+    }
+    
+    if ((nbyte = read(fd, buf, count)) < 0) {
+        perror("read");
+        free(buf);
+        close(fd);
+        return NULL;
+    }
+
+    return buf;
+}
+
+static void
+genpass(size_t passlen)
+{
+    uint8_t ind, *bytes;
+    size_t i;
+    
+    if ((bytes = randbytes(passlen)) == NULL) {
+        printf("fatal: unable to generate random bytes\n");
+        return;
+    }
+
+    for (i = 0; i < passlen; ++i) {
+        ind = bytes[i] % sizeof(chrtab);
+        printf("%c", chrtab[ind]);
+    }
+
+    printf("\n");
+    free(bytes);
+}
+
+int
+main(int argc, char **argv)
+{
+    int opt;
+    size_t passlen = 0;
+    size_t i, passcount = 0;
+
+    while ((opt = getopt(argc, argv, "hl:c:")) != -1) {
+        switch (opt) {
+        case 'h':
+            help();
+            return -1;
+        case 'l':
+            if ((passlen = atoi(optarg)) == 0) {
+                printf("fatal: bad length given\n");
+                return -1;
+            }
+
+            break;
+        case 'c':
+            if ((passcount = atoi(optarg)) == 0) {
+                printf("fatal: bad count given\n");
+                return -1;
+            }
+
+            break;
+        }
+    }
+
+    if (passcount == 0) {
+        ++passcount;
+    }
+
+    if (passlen == 0) {
+        printf("fatal: please specify a length with '-l'\n");
+        help();
+        return -1;
+    }
+
+    for (i = 0; i < passcount; ++i) {
+        genpass(passlen);
+    }
+
+    return 0;
+}