thinbus srp php fix to issue #10

    public function testCreateRandomBigIntegerInRange() {

        $N_base10str = "255";
        $N = new BigInteger($N_base10str, 10);
        $g_base10str = "1";
        $k_base16str = "1";

        $Srp = new ThinbusSrp($N_base10str, $g_base10str, $k_base16str, "sha256");

        $values = array();
        for( $i = 0; $i < 256; ++$i) {
            $values[$i] = 0;
        }
        for( $i = 0; $i < 1e4; ++$i) {
            $r = $Srp->createRandomBigIntegerInRange($N);
            $h = $r->toHex();
            $n = hexdec($h);
            $c = $values[$n];
            $c2 = $c + 1;
            $values[$n] = $c2;
        }
        $print = "loopCounter: ".$Srp->loopCounter."\n";
        foreach($values as $key => $item) {
            $print = $print."\n".$key.", ".$item;
        }
        return $print;
    }


======



(string:1955) loopCounter: 10046

0, 0
1, 31
2, 36
3, 36
4, 37
5, 41
6, 35
7, 51
8, 39
9, 31
10, 43
11, 42
12, 47
13, 37
14, 53
15, 44
16, 35
17, 32
18, 42
19, 41
20, 31
21, 39
22, 42
23, 40
24, 27
25, 51
26, 37
27, 47
28, 47
29, 41
30, 38
31, 36
32, 47
33, 39
34, 37
35, 39
36, 33
37, 40
38, 39
39, 38
40, 49
41, 41
42, 35
43, 48
44, 51
45, 46
46, 31
47, 39
48, 30
49, 42
50, 43
51, 38
52, 31
53, 45
54, 31
55, 45
56, 41
57, 42
58, 42
59, 42
60, 48
61, 47
62, 34
63, 41
64, 46
65, 40
66, 43
67, 36
68, 35
69, 53
70, 41
71, 38
72, 36
73, 32
74, 32
75, 29
76, 43
77, 39
78, 40
79, 50
80, 31
81, 34
82, 32
83, 41
84, 30
85, 40
86, 43
87, 28
88, 37
89, 38
90, 36
91, 29
92, 42
93, 32
94, 42
95, 45
96, 45
97, 32
98, 54
99, 40
100, 49
101, 33
102, 40
103, 44
104, 40
105, 40
106, 27
107, 41
108, 44
109, 44
110, 51
111, 39
112, 46
113, 43
114, 35
115, 43
116, 43
117, 49
118, 33
119, 36
120, 40
121, 46
122, 46
123, 41
124, 35
125, 42
126, 47
127, 41
128, 31
129, 41
130, 40
131, 43
132, 36
133, 39
134, 48
135, 29
136, 29
137, 53
138, 27
139, 46
140, 33
141, 44
142, 43
143, 40
144, 36
145, 32
146, 34
147, 43
148, 40
149, 37
150, 32
151, 38
152, 49
153, 41
154, 37
155, 39
156, 38
157, 41
158, 51
159, 33
160, 48
161, 38
162, 38
163, 38
164, 44
165, 41
166, 41
167, 38
168, 41
169, 32
170, 32
171, 44
172, 37
173, 30
174, 42
175, 33
176, 35
177, 44
178, 43
179, 52
180, 43
181, 38
182, 33
183, 42
184, 43
185, 36
186, 33
187, 36
188, 46
189, 36
190, 50
191, 43
192, 43
193, 34
194, 46
195, 44
196, 40
197, 33
198, 34
199, 34
200, 38
201, 45
202, 33
203, 31
204, 36
205, 32
206, 36
207, 39
208, 46
209, 27
210, 32
211, 33
212, 40
213, 27
214, 42
215, 44
216, 25
217, 47
218, 42
219, 43
220, 51
221, 33
222, 25
223, 47
224, 36
225, 43
226, 41
227, 36
228, 42
229, 46
230, 40
231, 35
232, 44
233, 38
234, 44
235, 46
236, 35
237, 49
238, 33
239, 39
240, 36
241, 28
242, 33
243, 33
244, 44
245, 41
246, 45
247, 36
248, 39
249, 50
250, 34
251, 40
252, 39
253, 33
254, 42
255, 0