--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/c/openssl.c	Sun Dec 26 11:13:37 2010 -0500
@@ -0,0 +1,72 @@
+#include "config.h"
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <openssl/sha.h>
+
+#define PASSSIZE 4
+
+int uw_hash_blocksize = 32;
+
+static int password[PASSSIZE];
+
+char *uw_sig_file = NULL;
+
+static void random_password() {
+  int i;
+
+  for (i = 0; i < PASSSIZE; ++i)
+    password[i] = rand();
+}
+
+void uw_init_crypto() {
+  if (uw_sig_file) {
+    int fd;
+
+    if (access(uw_sig_file, F_OK)) {
+      random_password();
+      
+      if ((fd = open(uw_sig_file, O_WRONLY | O_CREAT, 0700)) < 0) {
+        fprintf(stderr, "Can't open signature file %s\n", uw_sig_file);
+        perror("open");
+        exit(1);
+      }
+
+      if (write(fd, &password, sizeof password) != sizeof password) {
+        fprintf(stderr, "Error writing signature file\n");
+        exit(1);
+      }
+
+      close(fd);
+    } else {
+      if ((fd = open(uw_sig_file, O_RDONLY)) < 0) {
+        fprintf(stderr, "Can't open signature file %s\n", uw_sig_file);
+        perror("open");
+        exit(1);
+      }
+
+      if (read(fd, &password, sizeof password) != sizeof password) {
+        fprintf(stderr, "Error reading signature file\n");
+        exit(1);
+      }
+
+      close(fd);
+    }
+  } else
+    random_password();
+}
+
+void uw_sign(const char *in, unsigned char *out) {
+  SHA256_CTX c;
+
+  SHA256_Init(&c);
+  SHA256_Update(&c, password, sizeof password);
+  SHA256_Update(&c, in, strlen(in));
+  SHA256_Final(out, &c);
+}