Diff: wolfcrypt/src/arc4.c

Revision:

13:80fb167dafdf

Parent:

11:cee25a834751

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wolfcrypt/src/arc4.c	Tue May 30 06:16:19 2017 +0000
@@ -0,0 +1,142 @@
+/* arc4.c
+ *
+ * Copyright (C) 2006-2016 wolfSSL Inc.
+ *
+ * This file is part of wolfSSL.
+ *
+ * wolfSSL is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * wolfSSL is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
+ */
+
+
+#ifdef HAVE_CONFIG_H
+    #include <config.h>
+#endif
+
+#include <wolfssl/wolfcrypt/settings.h>
+
+#ifndef NO_RC4
+
+#include <wolfssl/wolfcrypt/error-crypt.h>
+#include <wolfssl/wolfcrypt/arc4.h>
+
+
+int wc_Arc4SetKey(Arc4* arc4, const byte* key, word32 length)
+{
+    int ret = 0;
+    word32 i;
+    word32 keyIndex = 0, stateIndex = 0;
+
+#if defined(WOLFSSL_ASYNC_CRYPT) && defined(WC_ASYNC_ENABLE_ARC4) && \
+        defined(HAVE_CAVIUM) && !defined(HAVE_CAVIUM_V)
+    if (arc4->asyncDev.marker == WOLFSSL_ASYNC_MARKER_ARC4) {
+        return NitroxArc4SetKey(arc4, key, length);
+    }
+#endif
+
+    arc4->x = 1;
+    arc4->y = 0;
+
+    for (i = 0; i < ARC4_STATE_SIZE; i++)
+        arc4->state[i] = (byte)i;
+
+    for (i = 0; i < ARC4_STATE_SIZE; i++) {
+        word32 a = arc4->state[i];
+        stateIndex += key[keyIndex] + a;
+        stateIndex &= 0xFF;
+        arc4->state[i] = arc4->state[stateIndex];
+        arc4->state[stateIndex] = (byte)a;
+
+        if (++keyIndex >= length)
+            keyIndex = 0;
+    }
+
+    return ret;
+}
+
+
+static INLINE byte MakeByte(word32* x, word32* y, byte* s)
+{
+    word32 a = s[*x], b;
+    *y = (*y+a) & 0xff;
+
+    b = s[*y];
+    s[*x] = (byte)b;
+    s[*y] = (byte)a;
+    *x = (*x+1) & 0xff;
+
+    return s[(a+b) & 0xff];
+}
+
+
+int wc_Arc4Process(Arc4* arc4, byte* out, const byte* in, word32 length)
+{
+    int ret = 0;
+    word32 x;
+    word32 y;
+
+#if defined(WOLFSSL_ASYNC_CRYPT) && defined(WC_ASYNC_ENABLE_ARC4) && \
+        defined(HAVE_CAVIUM) && !defined(HAVE_CAVIUM_V)
+    if (arc4->asyncDev.marker == WOLFSSL_ASYNC_MARKER_ARC4) {
+        return NitroxArc4Process(arc4, out, in, length);
+    }
+#endif
+
+    x = arc4->x;
+    y = arc4->y;
+
+    while(length--)
+        *out++ = *in++ ^ MakeByte(&x, &y, arc4->state);
+
+    arc4->x = (byte)x;
+    arc4->y = (byte)y;
+
+    return ret;
+}
+
+/* Initialize Arc4 for use with async device */
+int wc_Arc4Init(Arc4* arc4, void* heap, int devId)
+{
+    int ret = 0;
+
+    if (arc4 == NULL)
+        return BAD_FUNC_ARG;
+
+    arc4->heap = heap;
+
+#if defined(WOLFSSL_ASYNC_CRYPT) && defined(WC_ASYNC_ENABLE_ARC4)
+    ret = wolfAsync_DevCtxInit(&arc4->asyncDev, WOLFSSL_ASYNC_MARKER_ARC4,
+        arc4->heap, devId);
+#else
+    (void)devId;
+#endif /* WOLFSSL_ASYNC_CRYPT */
+
+    return ret;
+}
+
+
+/* Free Arc4 from use with async device */
+void wc_Arc4Free(Arc4* arc4)
+{
+    if (arc4 == NULL)
+        return;
+
+#if defined(WOLFSSL_ASYNC_CRYPT) && defined(WC_ASYNC_ENABLE_ARC4)
+    wolfAsync_DevCtxFree(&arc4->asyncDev, WOLFSSL_ASYNC_MARKER_ARC4);
+#endif /* WOLFSSL_ASYNC_CRYPT */
+}
+
+#endif /* NO_RC4 */
+
+