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xorcrypt.c

@@ -0,0 +1,55 @@
+#include <stdio.h>
+
+char getbyte (FILE *fp)
+{
+  char byte;
+  fread (&byte, 1, 1, fp);
+  return byte;
+}
+
+void putbyte (FILE *fp, char byte)
+{
+  fwrite (&byte, 1, 1, fp);
+}
+
+void xorfile (FILE *ifp, FILE *ofp, char key[])
+{
+  unsigned kpos = 0;
+  char byte;
+  for (;;)
+  {
+    byte = getbyte (ifp);
+    if (feof (ifp))
+      break;
+    else
+    {
+      if (key[kpos])
+        kpos++;
+      else
+        kpos = 0;
+      putbyte (ofp, (byte ^ key[kpos]));
+    }
+  }
+}
+
+int main (int argc, char *argv[])
+{
+  FILE *ifp, *ofp;
+  char *key = argv[3];
+  if (argc <= 3)
+  {
+    puts ("XORCRYPT infile outfile key");
+    puts ("    Encrypts/Decrypts a file using XOR operation.");
+    puts ("    Programmed by DISU \"1950\" DISU1950 in 2077.");
+    return 1;
+  }
+  ifp = fopen (argv[1], "rb");
+  ofp = fopen (argv[2], "wb");
+  if (ifp && ofp)
+  {
+    xorfile (ifp, ofp, key);
+    return 0;
+  }
+  puts ("Access was denied.");
+  return 1;
+}