-
Notifications
You must be signed in to change notification settings - Fork 1
/
crypt.cc
167 lines (159 loc) · 6.7 KB
/
crypt.cc
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
#include <node.h>
#include <node_buffer.h>
#include <iostream>
#include <node_object_wrap.h>
#include <nan.h>
using namespace v8;
using namespace node;
using namespace std;
#define CRC32_CR(c,b) (crc32_tab[((int)(c) ^ (b)) & 0xff] ^ ((c) >> 8))
class BinkpCrypt : public node::ObjectWrap {
public:
static void Init(v8::Handle<v8::Object> exports);
static Persistent<Function> js_conditioner;
BinkpCrypt();
static unsigned long crc32_tab[256];
protected:
unsigned long keys[3];
static NAN_METHOD(New);
static NAN_METHOD(init_keys);
static NAN_METHOD(ndecrypt_buf);
static NAN_METHOD(nencrypt_buf);
static v8::Persistent<FunctionTemplate> constructor_template;
private:
static v8::Persistent<v8::Function> constructor;
static int decrypt_byte(BinkpCrypt *obj);
static void decrypt_buf (char *buf, unsigned int bufsize,BinkpCrypt *obj);
static void encrypt_buf (char *buf, unsigned int bufsize,BinkpCrypt *obj);
static int update_keys(int c,BinkpCrypt *obj);
static char* test;
};
unsigned long BinkpCrypt::crc32_tab[] =
{
0x00000000,0x77073096,0xee0e612c,0x990951ba,0x076dc419,0x706af48f,0xe963a535,0x9e6495a3,
0x0edb8832,0x79dcb8a4,0xe0d5e91e,0x97d2d988,0x09b64c2b,0x7eb17cbd,0xe7b82d07,0x90bf1d91,
0x1db71064,0x6ab020f2,0xf3b97148,0x84be41de,0x1adad47d,0x6ddde4eb,0xf4d4b551,0x83d385c7,
0x136c9856,0x646ba8c0,0xfd62f97a,0x8a65c9ec,0x14015c4f,0x63066cd9,0xfa0f3d63,0x8d080df5,
0x3b6e20c8,0x4c69105e,0xd56041e4,0xa2677172,0x3c03e4d1,0x4b04d447,0xd20d85fd,0xa50ab56b,
0x35b5a8fa,0x42b2986c,0xdbbbc9d6,0xacbcf940,0x32d86ce3,0x45df5c75,0xdcd60dcf,0xabd13d59,
0x26d930ac,0x51de003a,0xc8d75180,0xbfd06116,0x21b4f4b5,0x56b3c423,0xcfba9599,0xb8bda50f,
0x2802b89e,0x5f058808,0xc60cd9b2,0xb10be924,0x2f6f7c87,0x58684c11,0xc1611dab,0xb6662d3d,
0x76dc4190,0x01db7106,0x98d220bc,0xefd5102a,0x71b18589,0x06b6b51f,0x9fbfe4a5,0xe8b8d433,
0x7807c9a2,0x0f00f934,0x9609a88e,0xe10e9818,0x7f6a0dbb,0x086d3d2d,0x91646c97,0xe6635c01,
0x6b6b51f4,0x1c6c6162,0x856530d8,0xf262004e,0x6c0695ed,0x1b01a57b,0x8208f4c1,0xf50fc457,
0x65b0d9c6,0x12b7e950,0x8bbeb8ea,0xfcb9887c,0x62dd1ddf,0x15da2d49,0x8cd37cf3,0xfbd44c65,
0x4db26158,0x3ab551ce,0xa3bc0074,0xd4bb30e2,0x4adfa541,0x3dd895d7,0xa4d1c46d,0xd3d6f4fb,
0x4369e96a,0x346ed9fc,0xad678846,0xda60b8d0,0x44042d73,0x33031de5,0xaa0a4c5f,0xdd0d7cc9,
0x5005713c,0x270241aa,0xbe0b1010,0xc90c2086,0x5768b525,0x206f85b3,0xb966d409,0xce61e49f,
0x5edef90e,0x29d9c998,0xb0d09822,0xc7d7a8b4,0x59b33d17,0x2eb40d81,0xb7bd5c3b,0xc0ba6cad,
0xedb88320,0x9abfb3b6,0x03b6e20c,0x74b1d29a,0xead54739,0x9dd277af,0x04db2615,0x73dc1683,
0xe3630b12,0x94643b84,0x0d6d6a3e,0x7a6a5aa8,0xe40ecf0b,0x9309ff9d,0x0a00ae27,0x7d079eb1,
0xf00f9344,0x8708a3d2,0x1e01f268,0x6906c2fe,0xf762575d,0x806567cb,0x196c3671,0x6e6b06e7,
0xfed41b76,0x89d32be0,0x10da7a5a,0x67dd4acc,0xf9b9df6f,0x8ebeeff9,0x17b7be43,0x60b08ed5,
0xd6d6a3e8,0xa1d1937e,0x38d8c2c4,0x4fdff252,0xd1bb67f1,0xa6bc5767,0x3fb506dd,0x48b2364b,
0xd80d2bda,0xaf0a1b4c,0x36034af6,0x41047a60,0xdf60efc3,0xa867df55,0x316e8eef,0x4669be79,
0xcb61b38c,0xbc66831a,0x256fd2a0,0x5268e236,0xcc0c7795,0xbb0b4703,0x220216b9,0x5505262f,
0xc5ba3bbe,0xb2bd0b28,0x2bb45a92,0x5cb36a04,0xc2d7ffa7,0xb5d0cf31,0x2cd99e8b,0x5bdeae1d,
0x9b64c2b0,0xec63f226,0x756aa39c,0x026d930a,0x9c0906a9,0xeb0e363f,0x72076785,0x05005713,
0x95bf4a82,0xe2b87a14,0x7bb12bae,0x0cb61b38,0x92d28e9b,0xe5d5be0d,0x7cdcefb7,0x0bdbdf21,
0x86d3d2d4,0xf1d4e242,0x68ddb3f8,0x1fda836e,0x81be16cd,0xf6b9265b,0x6fb077e1,0x18b74777,
0x88085ae6,0xff0f6a70,0x66063bca,0x11010b5c,0x8f659eff,0xf862ae69,0x616bffd3,0x166ccf45,
0xa00ae278,0xd70dd2ee,0x4e048354,0x3903b3c2,0xa7672661,0xd06016f7,0x4969474d,0x3e6e77db,
0xaed16a4a,0xd9d65adc,0x40df0b66,0x37d83bf0,0xa9bcae53,0xdebb9ec5,0x47b2cf7f,0x30b5ffe9,
0xbdbdf21c,0xcabac28a,0x53b39330,0x24b4a3a6,0xbad03605,0xcdd70693,0x54de5729,0x23d967bf,
0xb3667a2e,0xc4614ab8,0x5d681b02,0x2a6f2b94,0xb40bbe37,0xc30c8ea1,0x5a05df1b,0x2d02ef8d
};
Persistent<Function> BinkpCrypt::constructor;
Persistent<FunctionTemplate> BinkpCrypt::constructor_template;
BinkpCrypt::BinkpCrypt(){
}
void BinkpCrypt::Init(Handle<Object> exports) {
NanScope();
Local<FunctionTemplate> tpl = NanNew<FunctionTemplate>(New);
tpl->SetClassName(NanNew("BinkpCrypt"));
tpl->InstanceTemplate()->SetInternalFieldCount(1);
NODE_SET_PROTOTYPE_METHOD(tpl, "init_keys", init_keys);
NODE_SET_PROTOTYPE_METHOD(tpl, "decrypt_buf", ndecrypt_buf);
NODE_SET_PROTOTYPE_METHOD(tpl, "encrypt_buf", nencrypt_buf);
NanAssignPersistent(constructor, tpl->GetFunction());
exports->Set(NanNew("BinkpCrypt"), tpl->GetFunction());
}
NAN_METHOD(BinkpCrypt::New) {
NanScope();
if(!args.IsConstructCall()) {
const int argc = 1;
Local<Value> argv[argc] = { args[0] };
Local<Function> cons = NanNew<Function>(constructor);
NanReturnValue(cons->NewInstance(argc, argv));
}
BinkpCrypt *bcrypt;
bcrypt=new BinkpCrypt();
bcrypt->Wrap(args.This());
NanReturnValue(args.This());
}
NAN_METHOD(BinkpCrypt::init_keys) {
NanScope();
static NanAsciiString pass(args[0]->ToString());
char *password=*pass;
BinkpCrypt* obj = ObjectWrap::Unwrap<BinkpCrypt>(args.This());
obj->keys[0] = 305419896L;
obj->keys[1] = 591751049L;
obj->keys[2] = 878082192L;
while (*password)
{
update_keys((int)*password,obj);
password++;
}
NanReturnValue(args.This());
}
int BinkpCrypt::update_keys(int c,BinkpCrypt *obj)
{
int keyshift;
obj->keys[0] = CRC32_CR( obj->keys[0], c );
obj->keys[1] += obj->keys[0] & 0xff;
obj->keys[1] = obj->keys[1] * 134775813L + 1;
keyshift = (int) ( obj->keys[1] >> 24 );
obj->keys[2] = CRC32_CR( obj->keys[2], keyshift );
return c;
}
int BinkpCrypt::decrypt_byte (BinkpCrypt* obj){
unsigned temp;
temp = ((unsigned)obj->keys[2] & 0xffff) | 2;
return (int)(((temp * (temp ^ 1)) >> 8) & 0xff);
}
void BinkpCrypt::decrypt_buf (char *buf, unsigned int bufsize,BinkpCrypt* obj)
{
while (bufsize--)
{
update_keys(*buf++ ^= decrypt_byte(obj),obj);
}
}
void BinkpCrypt::encrypt_buf(char *buf, unsigned int bufsize,BinkpCrypt* obj)
{
int t;
while( bufsize-- ) {
t = decrypt_byte(obj);
update_keys( *buf ,obj);
*buf++ ^= t;
}
}
NAN_METHOD(BinkpCrypt::nencrypt_buf) {
NanScope();
unsigned int len=Buffer::Length(args[0]->ToObject());
BinkpCrypt* obj = ObjectWrap::Unwrap<BinkpCrypt>(args.This());
char *buf=Buffer::Data(args[0]->ToObject());
encrypt_buf (buf,len,obj);
NanReturnValue(NanNewBufferHandle(buf,len));
}
NAN_METHOD(BinkpCrypt::ndecrypt_buf) {
NanScope();
unsigned int len=Buffer::Length(args[0]->ToObject());
BinkpCrypt* obj = ObjectWrap::Unwrap<BinkpCrypt>(args.This());
char *buf=Buffer::Data(args[0]->ToObject());
decrypt_buf (buf,len,obj);
NanReturnValue(NanNewBufferHandle(buf,len));
}
void InitAll(Handle<Object> exports) {
BinkpCrypt::Init(exports);
}
NODE_MODULE(crypt, InitAll);