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
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
|
package org.bouncycastle.asn1.pkcs;
import java.math.BigInteger;
import java.util.Enumeration;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERNull;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
/**
* <pre>
* PBKDF2-params ::= SEQUENCE {
* salt CHOICE {
* specified OCTET STRING,
* otherSource AlgorithmIdentifier {{PBKDF2-SaltSources}}
* },
* iterationCount INTEGER (1..MAX),
* keyLength INTEGER (1..MAX) OPTIONAL,
* prf AlgorithmIdentifier {{PBKDF2-PRFs}} DEFAULT algid-hmacWithSHA1 }
* </pre>
*/
public class PBKDF2Params
extends ASN1Object
{
private static final AlgorithmIdentifier algid_hmacWithSHA1 = new AlgorithmIdentifier(PKCSObjectIdentifiers.id_hmacWithSHA1, DERNull.INSTANCE);
private ASN1OctetString octStr;
private ASN1Integer iterationCount;
private ASN1Integer keyLength;
private AlgorithmIdentifier prf;
/**
* Create PBKDF2Params from the passed in object,
*
* @param obj either PBKDF2Params or an ASN2Sequence.
* @return a PBKDF2Params instance.
*/
public static PBKDF2Params getInstance(
Object obj)
{
if (obj instanceof PBKDF2Params)
{
return (PBKDF2Params)obj;
}
if (obj != null)
{
return new PBKDF2Params(ASN1Sequence.getInstance(obj));
}
return null;
}
/**
* Create a PBKDF2Params with the specified salt, iteration count, and algid-hmacWithSHA1 for the prf.
*
* @param salt input salt.
* @param iterationCount input iteration count.
*/
public PBKDF2Params(
byte[] salt,
int iterationCount)
{
this.octStr = new DEROctetString(salt);
this.iterationCount = new ASN1Integer(iterationCount);
}
/**
* Create a PBKDF2Params with the specified salt, iteration count, keyLength, and algid-hmacWithSHA1 for the prf.
*
* @param salt input salt.
* @param iterationCount input iteration count.
* @param keyLength intended key length to be produced.
*/
public PBKDF2Params(
byte[] salt,
int iterationCount,
int keyLength)
{
this(salt, iterationCount);
this.keyLength = new ASN1Integer(keyLength);
}
/**
* Create a PBKDF2Params with the specified salt, iteration count, keyLength, and a defined prf.
*
* @param salt input salt.
* @param iterationCount input iteration count.
* @param keyLength intended key length to be produced.
* @param prf the pseudo-random function to use.
*/
public PBKDF2Params(
byte[] salt,
int iterationCount,
int keyLength,
AlgorithmIdentifier prf)
{
this(salt, iterationCount);
this.keyLength = new ASN1Integer(keyLength);
this.prf = prf;
}
/**
* Create a PBKDF2Params with the specified salt, iteration count, and a defined prf.
*
* @param salt input salt.
* @param iterationCount input iteration count.
* @param prf the pseudo-random function to use.
*/
public PBKDF2Params(
byte[] salt,
int iterationCount,
AlgorithmIdentifier prf)
{
this(salt, iterationCount);
this.prf = prf;
}
private PBKDF2Params(
ASN1Sequence seq)
{
Enumeration e = seq.getObjects();
octStr = (ASN1OctetString)e.nextElement();
iterationCount = (ASN1Integer)e.nextElement();
if (e.hasMoreElements())
{
Object o = e.nextElement();
if (o instanceof ASN1Integer)
{
keyLength = ASN1Integer.getInstance(o);
if (e.hasMoreElements())
{
o = e.nextElement();
}
else
{
o = null;
}
}
else
{
keyLength = null;
}
if (o != null)
{
prf = AlgorithmIdentifier.getInstance(o);
}
}
}
/**
* Return the salt to use.
*
* @return the input salt.
*/
public byte[] getSalt()
{
return octStr.getOctets();
}
/**
* Return the iteration count to use.
*
* @return the input iteration count.
*/
public BigInteger getIterationCount()
{
return iterationCount.getValue();
}
/**
* Return the intended length in octets of the derived key.
*
* @return length in octets for derived key, if specified.
*/
public BigInteger getKeyLength()
{
if (keyLength != null)
{
return keyLength.getValue();
}
return null;
}
/**
* Return true if the PRF is the default (hmacWithSHA1)
*
* @return true if PRF is default, false otherwise.
*/
public boolean isDefaultPrf()
{
return prf == null || prf.equals(algid_hmacWithSHA1);
}
/**
* Return the algId of the underlying pseudo random function to use.
*
* @return the prf algorithm identifier.
*/
public AlgorithmIdentifier getPrf()
{
if (prf != null)
{
return prf;
}
return algid_hmacWithSHA1;
}
/**
* Return an ASN.1 structure suitable for encoding.
*
* @return the object as an ASN.1 encodable structure.
*/
public ASN1Primitive toASN1Primitive()
{
ASN1EncodableVector v = new ASN1EncodableVector();
v.add(octStr);
v.add(iterationCount);
if (keyLength != null)
{
v.add(keyLength);
}
if (prf != null && !prf.equals(algid_hmacWithSHA1))
{
v.add(prf);
}
return new DERSequence(v);
}
}
|
