From f04d64869f3b1de54fb343f28f955584780001b8 Mon Sep 17 00:00:00 2001
From: mataes2007 <mataes2007@e753b5eb-9565-29b2-b5c5-2cc6f99dfbcb>
Date: Sat, 26 Nov 2011 15:41:10 +0000
Subject: Project folders rename part 3

git-svn-id: http://miranda-plugins.googlecode.com/svn/trunk@215 e753b5eb-9565-29b2-b5c5-2cc6f99dfbcb
---
 Dbx_mmap_SA/cryptors/RC4/cryptor.c | 133 +++++++++++++++++++++++++++++++++++++
 1 file changed, 133 insertions(+)
 create mode 100644 Dbx_mmap_SA/cryptors/RC4/cryptor.c

(limited to 'Dbx_mmap_SA/cryptors/RC4/cryptor.c')

diff --git a/Dbx_mmap_SA/cryptors/RC4/cryptor.c b/Dbx_mmap_SA/cryptors/RC4/cryptor.c
new file mode 100644
index 0000000..1f5f617
--- /dev/null
+++ b/Dbx_mmap_SA/cryptors/RC4/cryptor.c
@@ -0,0 +1,133 @@
+#include <windows.h>
+
+#define buf_size 1024
+
+typedef struct{
+	void* (__stdcall *GenerateKey)(char* key);
+	void (__stdcall *FreeKey)(void* key);
+	void (__stdcall *EncryptMem)(BYTE* data, int size, void* key);
+	void (__stdcall *DecryptMem)(BYTE* data, int size, void* key);
+
+    char* Name;
+    char* Info;
+    char* Author;
+    char* Site;
+    char* Email;
+
+	DWORD Version;
+
+	WORD uid;
+} Cryptor;
+
+typedef struct rc4_key
+{      
+   BYTE state[256];       
+   BYTE x;        
+   BYTE y;
+} rc4_key;
+
+#define swap_byte(x,y) t = *(x); *(x) = *(y); *(y) = t
+
+void prepare_key(BYTE *key_data_ptr, size_t key_data_len, rc4_key *key)
+{
+  int i = 0;
+  BYTE t = 0;
+  BYTE index1 = 0;
+  BYTE index2 = 0;
+  BYTE* state = 0;
+  unsigned long counter = 0;
+
+  state = &key->state[0];
+  for(counter = 0; counter < 256; counter++)
+  state[counter] = (BYTE)counter;
+  key->x = 0;
+  key->y = 0;
+  index1 = 0;
+  index2 = 0;
+  for(counter = 0; counter < 256; counter++)
+  {
+    index2 = (key_data_ptr[index1] + state[counter] + index2) % 256;
+    swap_byte(&state[counter], &state[index2]);
+    index1 = (index1 + 1) % key_data_len;
+  }
+}
+
+void rc4(BYTE *buffer_ptr, int buffer_len, rc4_key *key)
+{
+  BYTE t = 0;
+  BYTE x = 0;
+  BYTE y = 0;
+  BYTE* state = 0;
+  BYTE xorIndex = 0;
+  DWORD counter = 0;
+  BYTE old_state[256];
+
+  x = key->x;
+  y = key->y;
+  state = &key->state[0];
+  memcpy(old_state, key->state, 256);
+  for(counter = 0; counter < (DWORD)buffer_len; counter++)
+  {
+    x = (x + 1) % 256;
+    y = (state[x] + y) % 256;
+    swap_byte(&state[x], &state[y]);
+    xorIndex = (state[x] + state[y]) % 256;
+    buffer_ptr[counter] ^= state[xorIndex];
+  }
+  memcpy(key->state, old_state, 256);
+  //key->x = x;
+  //key->y = y;
+}
+
+
+void zero_fill(BYTE * pBuf, size_t bufSize)
+{
+	size_t i;
+	for(i = 0; i < bufSize; i++)
+		pBuf[i] = 0;
+}
+
+void* __stdcall GenerateKey(char* pwd)
+{
+	rc4_key* key;
+	key = (rc4_key*)malloc(sizeof(rc4_key));
+	zero_fill((BYTE*)key, sizeof(key));
+	prepare_key(pwd, strlen(pwd), key);
+	return key;
+}
+
+void __stdcall FreeKey(void* key)
+{
+	free(key);
+}
+
+void __stdcall EncryptMem(BYTE* data, int size, void* key)
+{
+	rc4(data, size, key);
+}
+
+void __stdcall DecryptMem(BYTE* data, int size, void* key)
+{
+	rc4(data, size, key);
+}
+
+Cryptor cryptor = 
+	{
+		GenerateKey,
+		FreeKey,
+		EncryptMem,
+		DecryptMem,
+		"RC4",
+		"Old, very easy to crack stream cipher",
+		"Unknown",
+		"http://ru.wikipedia.org/wiki/RC4",
+		"nomail",
+		0x00000100,
+		0xDEAD
+	};
+
+
+__declspec(dllexport) Cryptor* GetCryptor()
+{
+	return &cryptor;
+}
\ No newline at end of file
-- 
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