restructurization

_snippets/cryptpass.c

@@ -0,0 +1,34 @@
+#define _GNU_SOURCE
+#include <crypt.h> // gcc -lcrypt
+#include <errno.h>
+#include <stdio.h>
+
+int main(int argc, char **argv){
+    if(argc != 3){
+        printf("USAGE:\n\t%s <password> <salt>\n", argv[0]);
+        printf("Example:\n\t%s password \\$6\\$salt  -> SHA512 with given salt (see man 3 crypt)\n", argv[0]);
+        return 1;
+    }
+    struct crypt_data x;
+    x.initialized = 0;
+
+    char *c = crypt_r(argv[1], argv[2], &x);
+    int e = errno;
+    if(!c){
+        switch(e){
+            case EINVAL:
+                fprintf(stderr, "Wrong SALT format!\n");
+            break;
+            case ENOSYS:
+                fprintf(stderr, "crypt() not realized!\n");
+            break;
+            case EPERM:
+                fprintf(stderr, "/proc/sys/crypto/fips_enabled prohibits this encryption method!\n");
+            default:
+                fprintf(stderr, "Unknown error!\n");
+        }
+        return e;
+    }
+    printf("Result of crypt_r():\n%s\n", c);
+    return 0;
+}