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
|
/*
* PKCS #5 PBES1
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/pbes1.h>
#include <botan/pbkdf1.h>
#include <botan/der_enc.h>
#include <botan/ber_dec.h>
#include <botan/cbc.h>
#include <algorithm>
namespace Botan {
/*
* Encrypt some bytes using PBES1
*/
void PBE_PKCS5v15::write(const byte input[], size_t length)
{
pipe.write(input, length);
flush_pipe(true);
}
/*
* Start encrypting with PBES1
*/
void PBE_PKCS5v15::start_msg()
{
if(direction == ENCRYPTION)
pipe.append(new CBC_Encryption(block_cipher->clone(),
new PKCS7_Padding,
key, iv));
else
pipe.append(new CBC_Decryption(block_cipher->clone(),
new PKCS7_Padding,
key, iv));
pipe.start_msg();
if(pipe.message_count() > 1)
pipe.set_default_msg(pipe.default_msg() + 1);
}
/*
* Finish encrypting with PBES1
*/
void PBE_PKCS5v15::end_msg()
{
pipe.end_msg();
flush_pipe(false);
pipe.reset();
}
/*
* Flush the pipe
*/
void PBE_PKCS5v15::flush_pipe(bool safe_to_skip)
{
if(safe_to_skip && pipe.remaining() < 64)
return;
secure_vector<byte> buffer(DEFAULT_BUFFERSIZE);
while(pipe.remaining())
{
size_t got = pipe.read(&buffer[0], buffer.size());
send(buffer, got);
}
}
/*
* Set the passphrase to use
*/
void PBE_PKCS5v15::set_key(const std::string& passphrase)
{
PKCS5_PBKDF1 pbkdf(hash_function->clone());
secure_vector<byte> key_and_iv = pbkdf.derive_key(16, passphrase,
&salt[0], salt.size(),
iterations).bits_of();
key.resize(8);
iv.resize(8);
copy_mem(&key[0], &key_and_iv[0], 8);
copy_mem(&iv[0], &key_and_iv[8], 8);
}
/*
* Create a new set of PBES1 parameters
*/
void PBE_PKCS5v15::new_params(RandomNumberGenerator& rng)
{
iterations = 10000;
salt = rng.random_vec(8);
}
/*
* Encode PKCS#5 PBES1 parameters
*/
std::vector<byte> PBE_PKCS5v15::encode_params() const
{
return DER_Encoder()
.start_cons(SEQUENCE)
.encode(salt, OCTET_STRING)
.encode(iterations)
.end_cons()
.get_contents_unlocked();
}
/*
* Decode PKCS#5 PBES1 parameters
*/
void PBE_PKCS5v15::decode_params(DataSource& source)
{
BER_Decoder(source)
.start_cons(SEQUENCE)
.decode(salt, OCTET_STRING)
.decode(iterations)
.verify_end()
.end_cons();
if(salt.size() != 8)
throw Decoding_Error("PBES1: Encoded salt is not 8 octets");
}
/*
* Return an OID for this PBES1 type
*/
OID PBE_PKCS5v15::get_oid() const
{
const OID base_pbes1_oid("1.2.840.113549.1.5");
const std::string cipher = block_cipher->name();
const std::string digest = hash_function->name();
if(cipher == "DES" && digest == "MD2")
return (base_pbes1_oid + 1);
else if(cipher == "DES" && digest == "MD5")
return (base_pbes1_oid + 3);
else if(cipher == "DES" && digest == "SHA-160")
return (base_pbes1_oid + 10);
else if(cipher == "RC2" && digest == "MD2")
return (base_pbes1_oid + 4);
else if(cipher == "RC2" && digest == "MD5")
return (base_pbes1_oid + 6);
else if(cipher == "RC2" && digest == "SHA-160")
return (base_pbes1_oid + 11);
else
throw Internal_Error("PBE-PKCS5 v1.5: get_oid() has run out of options");
}
std::string PBE_PKCS5v15::name() const
{
return "PBE-PKCS5v15(" + block_cipher->name() + "," +
hash_function->name() + ")";
}
/*
* PKCS#5 v1.5 PBE Constructor
*/
PBE_PKCS5v15::PBE_PKCS5v15(BlockCipher* cipher,
HashFunction* hash,
Cipher_Dir dir) :
direction(dir), block_cipher(cipher), hash_function(hash)
{
if(cipher->name() != "DES" && cipher->name() != "RC2")
{
throw Invalid_Argument("PBE_PKCS5v1.5: Unknown cipher " +
cipher->name());
}
if(hash->name() != "MD2" && hash->name() != "MD5" &&
hash->name() != "SHA-160")
{
throw Invalid_Argument("PBE_PKCS5v1.5: Unknown hash " +
hash->name());
}
}
PBE_PKCS5v15::~PBE_PKCS5v15()
{
delete block_cipher;
delete hash_function;
}
}
|
