blob: 49b119ddaa6eed84fe82b0ea40d5e50d05124ceb (
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
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
182
183
184
185
|
package org.spongycastle.openpgp.operator.jcajce;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import org.spongycastle.bcpg.HashAlgorithmTags;
import org.spongycastle.bcpg.PublicKeyAlgorithmTags;
import org.spongycastle.bcpg.SymmetricKeyAlgorithmTags;
import org.spongycastle.openpgp.PGPException;
/**
* Basic utility class
*/
class PGPUtil
{
static String getDigestName(
int hashAlgorithm)
throws PGPException
{
switch (hashAlgorithm)
{
case HashAlgorithmTags.SHA1:
return "SHA1";
case HashAlgorithmTags.MD2:
return "MD2";
case HashAlgorithmTags.MD5:
return "MD5";
case HashAlgorithmTags.RIPEMD160:
return "RIPEMD160";
case HashAlgorithmTags.SHA256:
return "SHA256";
case HashAlgorithmTags.SHA384:
return "SHA384";
case HashAlgorithmTags.SHA512:
return "SHA512";
case HashAlgorithmTags.SHA224:
return "SHA224";
case HashAlgorithmTags.TIGER_192:
return "TIGER";
default:
throw new PGPException("unknown hash algorithm tag in getDigestName: " + hashAlgorithm);
}
}
static String getSignatureName(
int keyAlgorithm,
int hashAlgorithm)
throws PGPException
{
String encAlg;
switch (keyAlgorithm)
{
case PublicKeyAlgorithmTags.RSA_GENERAL:
case PublicKeyAlgorithmTags.RSA_SIGN:
encAlg = "RSA";
break;
case PublicKeyAlgorithmTags.DSA:
encAlg = "DSA";
break;
case PublicKeyAlgorithmTags.ELGAMAL_ENCRYPT: // in some malformed cases.
case PublicKeyAlgorithmTags.ELGAMAL_GENERAL:
encAlg = "ElGamal";
break;
default:
throw new PGPException("unknown algorithm tag in signature:" + keyAlgorithm);
}
return getDigestName(hashAlgorithm) + "with" + encAlg;
}
static String getSymmetricCipherName(
int algorithm)
{
switch (algorithm)
{
case SymmetricKeyAlgorithmTags.NULL:
return null;
case SymmetricKeyAlgorithmTags.TRIPLE_DES:
return "DESEDE";
case SymmetricKeyAlgorithmTags.IDEA:
return "IDEA";
case SymmetricKeyAlgorithmTags.CAST5:
return "CAST5";
case SymmetricKeyAlgorithmTags.BLOWFISH:
return "Blowfish";
case SymmetricKeyAlgorithmTags.SAFER:
return "SAFER";
case SymmetricKeyAlgorithmTags.DES:
return "DES";
case SymmetricKeyAlgorithmTags.AES_128:
return "AES";
case SymmetricKeyAlgorithmTags.AES_192:
return "AES";
case SymmetricKeyAlgorithmTags.AES_256:
return "AES";
case SymmetricKeyAlgorithmTags.TWOFISH:
return "Twofish";
default:
throw new IllegalArgumentException("unknown symmetric algorithm: " + algorithm);
}
}
public static SecretKey makeSymmetricKey(
int algorithm,
byte[] keyBytes)
throws PGPException
{
String algName;
switch (algorithm)
{
case SymmetricKeyAlgorithmTags.TRIPLE_DES:
algName = "DES_EDE";
break;
case SymmetricKeyAlgorithmTags.IDEA:
algName = "IDEA";
break;
case SymmetricKeyAlgorithmTags.CAST5:
algName = "CAST5";
break;
case SymmetricKeyAlgorithmTags.BLOWFISH:
algName = "Blowfish";
break;
case SymmetricKeyAlgorithmTags.SAFER:
algName = "SAFER";
break;
case SymmetricKeyAlgorithmTags.DES:
algName = "DES";
break;
case SymmetricKeyAlgorithmTags.AES_128:
algName = "AES";
break;
case SymmetricKeyAlgorithmTags.AES_192:
algName = "AES";
break;
case SymmetricKeyAlgorithmTags.AES_256:
algName = "AES";
break;
case SymmetricKeyAlgorithmTags.TWOFISH:
algName = "Twofish";
break;
default:
throw new PGPException("unknown symmetric algorithm: " + algorithm);
}
return new SecretKeySpec(keyBytes, algName);
}
public static byte[] padSessionData(byte[] sessionInfo)
{
byte[] result = new byte[40];
System.arraycopy(sessionInfo, 0, result, 0, sessionInfo.length);
byte padValue = (byte)(result.length -sessionInfo.length);
for (int i = sessionInfo.length; i != result.length; i++)
{
result[i] = padValue;
}
return result;
}
public static byte[] unpadSessionData(byte[] encoded)
throws PGPException
{
byte padValue = encoded[encoded.length - 1];
for (int i = encoded.length - padValue; i != encoded.length; i++)
{
if (encoded[i] != padValue)
{
throw new PGPException("bad padding found in session data");
}
}
byte[] taggedKey = new byte[encoded.length - padValue];
System.arraycopy(encoded, 0, taggedKey, 0, taggedKey.length);
return taggedKey;
}
}
|
