Openssl 1.1.0h

2018-04-02 22:33:38 +09:00
commit 1fd4faa81c
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+/*
+ * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#include <openssl/rc4.h>
+#include "rc4_locl.h"
+#include <openssl/opensslv.h>
+
+const char *RC4_options(void)
+{
+    if (sizeof(RC4_INT) == 1)
+        return ("rc4(char)");
+    else
+        return ("rc4(int)");
+}
+
+/*-
+ * RC4 as implemented from a posting from
+ * Newsgroups: sci.crypt
+ * From: sterndark@netcom.com (David Sterndark)
+ * Subject: RC4 Algorithm revealed.
+ * Message-ID: <sternCvKL4B.Hyy@netcom.com>
+ * Date: Wed, 14 Sep 1994 06:35:31 GMT
+ */
+
+void RC4_set_key(RC4_KEY *key, int len, const unsigned char *data)
+{
+    register RC4_INT tmp;
+    register int id1, id2;
+    register RC4_INT *d;
+    unsigned int i;
+
+    d = &(key->data[0]);
+    key->x = 0;
+    key->y = 0;
+    id1 = id2 = 0;
+
+#define SK_LOOP(d,n) { \
+                tmp=d[(n)]; \
+                id2 = (data[id1] + tmp + id2) & 0xff; \
+                if (++id1 == len) id1=0; \
+                d[(n)]=d[id2]; \
+                d[id2]=tmp; }
+
+    for (i = 0; i < 256; i++)
+        d[i] = i;
+    for (i = 0; i < 256; i += 4) {
+        SK_LOOP(d, i + 0);
+        SK_LOOP(d, i + 1);
+        SK_LOOP(d, i + 2);
+        SK_LOOP(d, i + 3);
+    }
+}