1 files changed, 79 insertions, 0 deletions
diff --git a/third_party/heimdal/lib/hcrypto/rc4.c b/third_party/heimdal/lib/hcrypto/rc4.c
new file mode 100644
index 0000000..cc7882d
--- /dev/null
+++ b/third_party/heimdal/lib/hcrypto/rc4.c
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2004 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/* implemented from description in draft-kaukonen-cipher-arcfour-03.txt */
+
+#include <config.h>
+#include <roken.h>
+
+#include <rc4.h>
+
+#define SWAP(k,x,y)				\
+{ unsigned int _t; 				\
+  _t = k->state[x]; 				\
+  k->state[x] = k->state[y]; 			\
+  k->state[y] = _t;				\
+}
+
+void
+RC4_set_key(RC4_KEY *key, const int len, const unsigned char *data)
+{
+    int i, j;
+
+    for (i = 0; i < 256; i++)
+	key->state[i] = i;
+    for (i = 0, j = 0; i < 256; i++) {
+	j = (j + key->state[i] + data[i % len]) % 256;
+	SWAP(key, i, j);
+    }
+    key->x = key->y = 0;
+}
+
+void
+RC4(RC4_KEY *key, const int len, const unsigned char *in, unsigned char *out)
+{
+    int i, t;
+    unsigned x, y;
+
+    x = key->x;
+    y = key->y;
+    for (i = 0; i < len; i++) {
+	x = (x + 1) % 256;
+	y = (y + key->state[x]) % 256;
+	SWAP(key, x, y);
+	t = (key->state[x] + key->state[y]) % 256;
+	*out++ = key->state[t] ^ *in++;
+    }
+    key->x = x;
+    key->y = y;
+}