aboutsummaryrefslogtreecommitdiffstats
path: root/src/modules/common/swcipher.cpp
blob: 9b2d9cbee315f5db7d97fe302e93f51bfa02219d (plain) (blame)
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
/******************************************************************************
 *  swcipher.cpp   - code for class 'SWCipher'- a driver class that provides
 *				cipher utilities.
 */

#include <string.h>
#include <stdlib.h>
#include <swcipher.h>

SWORD_NAMESPACE_START

/******************************************************************************
 * SWCipher Constructor - Initializes data for instance of SWCipher
 *
 */

SWCipher::SWCipher(unsigned char *key) {
	master.initialize(key, strlen((char *)key));
	buf = 0;
}


/******************************************************************************
 * SWCipher Destructor - Cleans up instance of SWCipher
 */

SWCipher::~SWCipher()
{
	if (buf)
		free(buf);
}


char *SWCipher::Buf(const char *ibuf, unsigned int ilen)
{
	if (ibuf) {
	
		if (buf)
			free(buf);

		if (!ilen) {
		        len = strlen(buf);
			ilen = len + 1;
		}
		else len = ilen;

		buf = (char *) malloc(ilen);
		memcpy(buf, ibuf, ilen);
		cipher = false;
	}

	Decode();

	return buf;
}


char *SWCipher::cipherBuf(unsigned int *ilen, const char *ibuf)
{
	if (ibuf) {
	
		if (buf)
			free(buf);
			
		buf = (char *) malloc(*ilen);
		memcpy(buf, ibuf, *ilen);
		len = *ilen;
		cipher = true;
	}

	Encode();

	*ilen = (short)len;
	return buf;
}


/******************************************************************************
 * SWCipher::Encode	- This function "encodes" the input stream into the
 *						output stream.
 *						The GetChars() and SendChars() functions are
 *						used to separate this method from the actual
 *						i/o.
 */

void SWCipher::Encode(void)
{
	if (!cipher) {
		work = master;
		for (int i = 0; i < len; i++)
			buf[i] = work.encrypt(buf[i]);
		cipher = true;
	}
}


/******************************************************************************
 * SWCipher::Decode	- This function "decodes" the input stream into the
 *						output stream.
 *						The GetChars() and SendChars() functions are
 *						used to separate this method from the actual
 *						i/o.
 */

void SWCipher::Decode(void)
{
	if (cipher) {
		work = master;
		for (int i = 0; i < len; i++)
			buf[i] = work.decrypt(buf[i]);
		cipher = false;
	}
}


/******************************************************************************
 * SWCipher::setCipherKey	- setter for a new CipherKey
 *
 */

void SWCipher::setCipherKey(const char *ikey) {
	unsigned char *key = (unsigned char *)ikey;
	master.initialize(key, strlen((char *)key));
}

SWORD_NAMESPACE_END