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1 files changed, 56 insertions, 0 deletions

diff --git a/fakerandom.c b/fakerandom.c
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+/*
+
+  Copyright (c) 2017 Samuel Lidén Borell <samuel@kodafritt.se>
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy
+  of this software and associated documentation files (the "Software"), to deal
+  in the Software without restriction, including without limitation the rights
+  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+  copies of the Software, and to permit persons to whom the Software is
+  furnished to do so, subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in
+  all copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+  THE SOFTWARE.
+
+*/
+
+#include <fcntl.h>
+#include <linux/random.h>
+#include <sys/ioctl.h>
+#include <stdio.h>
+
+int main(int argc, const char **argv)
+{
+    int fd, res, ent;
+
+    (void) argv;
+    if (argc > 1) {
+        printf("usage: fakerandom\n\n"
+               "Increases the entropy counter, without actually adding any entropy.\n"
+               "Obviously this is NOT secure. Do not use on production systems!\n\n");
+        return 0;
+    }
+
+    fd = open("/dev/random", O_WRONLY);
+    if (fd < 0) {
+        perror("failed to open /dev/random");
+        return 1;
+    }
+
+    ent = 0x1000000;
+    res = ioctl(fd, RNDADDTOENTCNT, &ent);
+    if (res < 0) {
+        perror("failed to add fake entropy");
+        return 1;
+    }
+    return 0;
+}
+