From 6c417a45f25de9480ef200177c7bed0f4782eb19 Mon Sep 17 00:00:00 2001
From: sje <sje@4f64403b-2f21-0410-a795-97e2b3489a10>
Date: Thu, 28 Jun 2007 08:34:59 +0000
Subject: git-svn-id: https://server.scottellis.com.au/svn/mim_plugs@219
 4f64403b-2f21-0410-a795-97e2b3489a10

---
 MySpace/arc4.cpp | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 MySpace/arc4.cpp

(limited to 'MySpace/arc4.cpp')

diff --git a/MySpace/arc4.cpp b/MySpace/arc4.cpp
new file mode 100644
index 0000000..7060437
--- /dev/null
+++ b/MySpace/arc4.cpp
@@ -0,0 +1,52 @@
+#include "common.h"
+#include "arc4.h"
+
+void swap(char *b1, char *b2) {
+ char b = *b1;
+ *b1 = *b2;
+ *b2 = b;
+}
+
+void arc4_init(mir_arc4_ctx *ctx, char *key, int keylen) {
+	int i;
+	for(i = 0; i < 256; i++)
+		ctx->lookup[i] = i;
+
+	ctx->x = 0;	
+	for(i = 0; i < 256; i++) {
+        ctx->x = (key[i % keylen] + ctx->lookup[i] + ctx->x) & 0xFF;
+        swap(&ctx->lookup[ctx->x], &ctx->lookup[i]);
+	}
+	ctx->x = 0;
+	ctx->y = 0;
+}
+
+void arc4_crypt(mir_arc4_ctx *ctx, char *dataIn, char *dataOut, int datalen) {
+	for(int i = 0; i < datalen; i++) {
+		ctx->x = (ctx->x + 1) & 0xFF;
+		ctx->y = (ctx->lookup[ctx->x] + ctx->y) & 0xFF;
+		swap(&ctx->lookup[ctx->x], &ctx->lookup[ctx->y]);
+		dataOut[i] = (dataIn[i] ^ ctx->lookup[(ctx->lookup[ctx->x] + ctx->lookup[ctx->y]) & 0xFF]);
+	}
+}
+
+int GetARC4Interface(WPARAM wParam, LPARAM lParam) {
+	struct ARC4_INTERFACE *arc4i = (struct ARC4_INTERFACE*) lParam;
+	if ( arc4i == NULL )
+		return 1;
+	if ( arc4i->cbSize != sizeof( struct ARC4_INTERFACE ))
+		return 1;
+    
+	arc4i->arc4_init = arc4_init;
+	arc4i->arc4_crypt = arc4_crypt;
+	return 0;
+}
+
+HANDLE hService;
+void InitARC4Module() {
+	hService = CreateServiceFunction(MS_SYSTEM_GET_ARC4I, GetARC4Interface);
+}
+
+void DeinitARC4Module() {
+	DestroyServiceFunction(hService);
+}
-- 
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