blob: 3e1727e483d8726e90165c0b7a69616e946e9911 (
plain)
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
|
package org.bouncycastle.asn1.eac;
import java.math.BigInteger;
import java.util.Enumeration;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERSequence;
/**
* an Iso7816RSAPublicKeyStructure structure.
* <pre>
* Certificate Holder Authorization ::= SEQUENCE {
* // modulus should be at least 1024bit and a multiple of 512.
* DERTaggedObject modulus,
* // access rights exponent
* DERTaggedObject accessRights,
* }
* </pre>
*/
public class RSAPublicKey
extends PublicKeyDataObject
{
private ASN1ObjectIdentifier usage;
private BigInteger modulus;
private BigInteger exponent;
private int valid = 0;
private static int modulusValid = 0x01;
private static int exponentValid = 0x02;
RSAPublicKey(ASN1Sequence seq)
{
Enumeration en = seq.getObjects();
this.usage = ASN1ObjectIdentifier.getInstance(en.nextElement());
while (en.hasMoreElements())
{
UnsignedInteger val = UnsignedInteger.getInstance(en.nextElement());
switch (val.getTagNo())
{
case 0x1:
setModulus(val);
break;
case 0x2:
setExponent(val);
break;
default:
throw new IllegalArgumentException("Unknown DERTaggedObject :" + val.getTagNo() + "-> not an Iso7816RSAPublicKeyStructure");
}
}
if (valid != 0x3)
{
throw new IllegalArgumentException("missing argument -> not an Iso7816RSAPublicKeyStructure");
}
}
public RSAPublicKey(ASN1ObjectIdentifier usage, BigInteger modulus, BigInteger exponent)
{
this.usage = usage;
this.modulus = modulus;
this.exponent = exponent;
}
public ASN1ObjectIdentifier getUsage()
{
return usage;
}
public BigInteger getModulus()
{
return modulus;
}
public BigInteger getPublicExponent()
{
return exponent;
}
private void setModulus(UnsignedInteger modulus)
{
if ((valid & modulusValid) == 0)
{
valid |= modulusValid;
this.modulus = modulus.getValue();
}
else
{
throw new IllegalArgumentException("Modulus already set");
}
}
private void setExponent(UnsignedInteger exponent)
{
if ((valid & exponentValid) == 0)
{
valid |= exponentValid;
this.exponent = exponent.getValue();
}
else
{
throw new IllegalArgumentException("Exponent already set");
}
}
public ASN1Primitive toASN1Primitive()
{
ASN1EncodableVector v = new ASN1EncodableVector();
v.add(usage);
v.add(new UnsignedInteger(0x01, getModulus()));
v.add(new UnsignedInteger(0x02, getPublicExponent()));
return new DERSequence(v);
}
}
|