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
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
package org.spongycastle.eac.operator.jcajce;
import java.io.IOException;
import java.io.OutputStream;
import java.math.BigInteger;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.Provider;
import java.security.PublicKey;
import java.security.Signature;
import java.security.SignatureException;
import org.spongycastle.asn1.ASN1EncodableVector;
import org.spongycastle.asn1.ASN1Integer;
import org.spongycastle.asn1.ASN1ObjectIdentifier;
import org.spongycastle.asn1.DERSequence;
import org.spongycastle.asn1.eac.EACObjectIdentifiers;
import org.spongycastle.eac.operator.EACSignatureVerifier;
import org.spongycastle.operator.OperatorCreationException;
import org.spongycastle.operator.OperatorStreamException;
import org.spongycastle.operator.RuntimeOperatorException;
public class JcaEACSignatureVerifierBuilder
{
private EACHelper helper = new DefaultEACHelper();
public JcaEACSignatureVerifierBuilder setProvider(String providerName)
{
this.helper = new NamedEACHelper(providerName);
return this;
}
public JcaEACSignatureVerifierBuilder setProvider(Provider provider)
{
this.helper = new ProviderEACHelper(provider);
return this;
}
public EACSignatureVerifier build(final ASN1ObjectIdentifier usageOid, PublicKey pubKey)
throws OperatorCreationException
{
Signature sig;
try
{
sig = helper.getSignature(usageOid);
sig.initVerify(pubKey);
}
catch (NoSuchAlgorithmException e)
{
throw new OperatorCreationException("unable to find algorithm: " + e.getMessage(), e);
}
catch (NoSuchProviderException e)
{
throw new OperatorCreationException("unable to find provider: " + e.getMessage(), e);
}
catch (InvalidKeyException e)
{
throw new OperatorCreationException("invalid key: " + e.getMessage(), e);
}
final SignatureOutputStream sigStream = new SignatureOutputStream(sig);
return new EACSignatureVerifier()
{
public ASN1ObjectIdentifier getUsageIdentifier()
{
return usageOid;
}
public OutputStream getOutputStream()
{
return sigStream;
}
public boolean verify(byte[] expected)
{
try
{
if (usageOid.on(EACObjectIdentifiers.id_TA_ECDSA))
{
try
{
byte[] reencoded = derEncode(expected);
return sigStream.verify(reencoded);
}
catch (Exception e)
{
return false;
}
}
else
{
return sigStream.verify(expected);
}
}
catch (SignatureException e)
{
throw new RuntimeOperatorException("exception obtaining signature: " + e.getMessage(), e);
}
}
};
}
private static byte[] derEncode(byte[] rawSign) throws IOException
{
int len = rawSign.length / 2;
byte[] r = new byte[len];
byte[] s = new byte[len];
System.arraycopy(rawSign, 0, r, 0, len);
System.arraycopy(rawSign, len, s, 0, len);
ASN1EncodableVector v = new ASN1EncodableVector();
v.add(new ASN1Integer(new BigInteger(1, r)));
v.add(new ASN1Integer(new BigInteger(1, s)));
DERSequence seq = new DERSequence(v);
return seq.getEncoded();
}
private class SignatureOutputStream
extends OutputStream
{
private Signature sig;
SignatureOutputStream(Signature sig)
{
this.sig = sig;
}
public void write(byte[] bytes, int off, int len)
throws IOException
{
try
{
sig.update(bytes, off, len);
}
catch (SignatureException e)
{
throw new OperatorStreamException("exception in content signer: " + e.getMessage(), e);
}
}
public void write(byte[] bytes)
throws IOException
{
try
{
sig.update(bytes);
}
catch (SignatureException e)
{
throw new OperatorStreamException("exception in content signer: " + e.getMessage(), e);
}
}
public void write(int b)
throws IOException
{
try
{
sig.update((byte)b);
}
catch (SignatureException e)
{
throw new OperatorStreamException("exception in content signer: " + e.getMessage(), e);
}
}
boolean verify(byte[] expected)
throws SignatureException
{
return sig.verify(expected);
}
}
}
|
