-
Notifications
You must be signed in to change notification settings - Fork 7
Expand file tree
/
Copy pathPrivateKey.java
More file actions
61 lines (50 loc) · 1.57 KB
/
PrivateKey.java
File metadata and controls
61 lines (50 loc) · 1.57 KB
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
package ECC;
import java.math.BigInteger;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.List;
/**
* The private key of the El Gamal Elliptic Curve Cryptography.
*
* The key consists of: c, the elliptic curve used in the calculations, k is the
* private key, a randomly-generated integer, satisfying 1 <= k < p-1.
*/
public class PrivateKey {
private EllipticCurve c;
private BigInteger k;
public PrivateKey(EllipticCurve c, BigInteger k) {
this.c = c;
this.k = k;
}
public PrivateKey(String pathFile) {
try {
List<String> lines = Files.readAllLines(Paths.get(pathFile), StandardCharsets.UTF_8);
BigInteger a = new BigInteger(lines.get(0), 16);
BigInteger b = new BigInteger(lines.get(1), 16);
BigInteger p = new BigInteger(lines.get(2), 16);
BigInteger g1 = new BigInteger(lines.get(3), 16);
BigInteger g2 = new BigInteger(lines.get(4), 16);
BigInteger k = new BigInteger(lines.get(5), 16);
EllipticCurve eC = new EllipticCurve(a, b, p, new Point(g1, g2));
this.c = eC;
this.k = k;
} catch (Exception e) {
}
}
public void setCurve(EllipticCurve c) {
this.c = c;
}
public EllipticCurve getCurve() {
return c;
}
public void setKey(BigInteger k) {
this.k = k;
}
public BigInteger getKey() {
return k;
}
public Point getBasePoint() {
return c.getBasePoint();
}
}