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
|
/*
* OpenSSL Block Cipher
* (C) 1999-2010 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/internal/openssl_engine.h>
#include <openssl/evp.h>
namespace Botan {
namespace {
/*
* EVP Block Cipher
*/
class EVP_BlockCipher : public BlockCipher
{
public:
void clear();
std::string name() const { return cipher_name; }
BlockCipher* clone() const;
size_t block_size() const { return block_sz; }
EVP_BlockCipher(const EVP_CIPHER*, const std::string&);
EVP_BlockCipher(const EVP_CIPHER*, const std::string&,
size_t, size_t, size_t);
~EVP_BlockCipher();
private:
void encrypt_n(const byte in[], byte out[], size_t blocks) const;
void decrypt_n(const byte in[], byte out[], size_t blocks) const;
void key_schedule(const byte[], size_t);
size_t block_sz;
std::string cipher_name;
mutable EVP_CIPHER_CTX encrypt, decrypt;
};
/*
* EVP Block Cipher Constructor
*/
EVP_BlockCipher::EVP_BlockCipher(const EVP_CIPHER* algo,
const std::string& algo_name) :
BlockCipher(EVP_CIPHER_key_length(algo)),
block_sz(EVP_CIPHER_block_size(algo)),
cipher_name(algo_name)
{
if(EVP_CIPHER_mode(algo) != EVP_CIPH_ECB_MODE)
throw Invalid_Argument("EVP_BlockCipher: Non-ECB EVP was passed in");
EVP_CIPHER_CTX_init(&encrypt);
EVP_CIPHER_CTX_init(&decrypt);
EVP_EncryptInit_ex(&encrypt, algo, 0, 0, 0);
EVP_DecryptInit_ex(&decrypt, algo, 0, 0, 0);
EVP_CIPHER_CTX_set_padding(&encrypt, 0);
EVP_CIPHER_CTX_set_padding(&decrypt, 0);
}
/*
* EVP Block Cipher Constructor
*/
EVP_BlockCipher::EVP_BlockCipher(const EVP_CIPHER* algo,
const std::string& algo_name,
size_t key_min, size_t key_max,
size_t key_mod) :
BlockCipher(key_min, key_max, key_mod),
block_sz(EVP_CIPHER_block_size(algo)),
cipher_name(algo_name)
{
if(EVP_CIPHER_mode(algo) != EVP_CIPH_ECB_MODE)
throw Invalid_Argument("EVP_BlockCipher: Non-ECB EVP was passed in");
EVP_CIPHER_CTX_init(&encrypt);
EVP_CIPHER_CTX_init(&decrypt);
EVP_EncryptInit_ex(&encrypt, algo, 0, 0, 0);
EVP_DecryptInit_ex(&decrypt, algo, 0, 0, 0);
EVP_CIPHER_CTX_set_padding(&encrypt, 0);
EVP_CIPHER_CTX_set_padding(&decrypt, 0);
}
/*
* EVP Block Cipher Destructor
*/
EVP_BlockCipher::~EVP_BlockCipher()
{
EVP_CIPHER_CTX_cleanup(&encrypt);
EVP_CIPHER_CTX_cleanup(&decrypt);
}
/*
* Encrypt a block
*/
void EVP_BlockCipher::encrypt_n(const byte in[], byte out[],
size_t blocks) const
{
int out_len = 0;
EVP_EncryptUpdate(&encrypt, out, &out_len, in, blocks * block_sz);
}
/*
* Decrypt a block
*/
void EVP_BlockCipher::decrypt_n(const byte in[], byte out[],
size_t blocks) const
{
int out_len = 0;
EVP_DecryptUpdate(&decrypt, out, &out_len, in, blocks * block_sz);
}
/*
* Set the key
*/
void EVP_BlockCipher::key_schedule(const byte key[], size_t length)
{
SecureVector<byte> full_key(key, length);
if(cipher_name == "TripleDES" && length == 16)
{
full_key += std::make_pair(key, 8);
}
else
if(EVP_CIPHER_CTX_set_key_length(&encrypt, length) == 0 ||
EVP_CIPHER_CTX_set_key_length(&decrypt, length) == 0)
throw Invalid_Argument("EVP_BlockCipher: Bad key length for " +
cipher_name);
if(cipher_name == "RC2")
{
EVP_CIPHER_CTX_ctrl(&encrypt, EVP_CTRL_SET_RC2_KEY_BITS, length*8, 0);
EVP_CIPHER_CTX_ctrl(&decrypt, EVP_CTRL_SET_RC2_KEY_BITS, length*8, 0);
}
EVP_EncryptInit_ex(&encrypt, 0, 0, full_key.begin(), 0);
EVP_DecryptInit_ex(&decrypt, 0, 0, full_key.begin(), 0);
}
/*
* Return a clone of this object
*/
BlockCipher* EVP_BlockCipher::clone() const
{
return new EVP_BlockCipher(EVP_CIPHER_CTX_cipher(&encrypt),
cipher_name, MINIMUM_KEYLENGTH,
MAXIMUM_KEYLENGTH, KEYLENGTH_MULTIPLE);
}
/*
* Clear memory of sensitive data
*/
void EVP_BlockCipher::clear()
{
const EVP_CIPHER* algo = EVP_CIPHER_CTX_cipher(&encrypt);
EVP_CIPHER_CTX_cleanup(&encrypt);
EVP_CIPHER_CTX_cleanup(&decrypt);
EVP_CIPHER_CTX_init(&encrypt);
EVP_CIPHER_CTX_init(&decrypt);
EVP_EncryptInit_ex(&encrypt, algo, 0, 0, 0);
EVP_DecryptInit_ex(&decrypt, algo, 0, 0, 0);
EVP_CIPHER_CTX_set_padding(&encrypt, 0);
EVP_CIPHER_CTX_set_padding(&decrypt, 0);
}
}
/*
* Look for an algorithm with this name
*/
BlockCipher*
OpenSSL_Engine::find_block_cipher(const SCAN_Name& request,
Algorithm_Factory&) const
{
#define HANDLE_EVP_CIPHER(NAME, EVP) \
if(request.algo_name() == NAME && request.arg_count() == 0) \
return new EVP_BlockCipher(EVP, NAME);
#define HANDLE_EVP_CIPHER_KEYLEN(NAME, EVP, MIN, MAX, MOD) \
if(request.algo_name() == NAME && request.arg_count() == 0) \
return new EVP_BlockCipher(EVP, NAME, MIN, MAX, MOD);
#if !defined(OPENSSL_NO_AES)
/*
Using OpenSSL's AES causes crashes inside EVP on x86-64 with OpenSSL 0.9.8g
cause is unknown
*/
HANDLE_EVP_CIPHER("AES-128", EVP_aes_128_ecb());
HANDLE_EVP_CIPHER("AES-192", EVP_aes_192_ecb());
HANDLE_EVP_CIPHER("AES-256", EVP_aes_256_ecb());
#endif
#if !defined(OPENSSL_NO_DES)
HANDLE_EVP_CIPHER("DES", EVP_des_ecb());
HANDLE_EVP_CIPHER_KEYLEN("TripleDES", EVP_des_ede3_ecb(), 16, 24, 8);
#endif
#if !defined(OPENSSL_NO_BF)
HANDLE_EVP_CIPHER_KEYLEN("Blowfish", EVP_bf_ecb(), 1, 56, 1);
#endif
#if !defined(OPENSSL_NO_CAST)
HANDLE_EVP_CIPHER_KEYLEN("CAST-128", EVP_cast5_ecb(), 1, 16, 1);
#endif
#if !defined(OPENSSL_NO_CAMELLIA)
HANDLE_EVP_CIPHER("Camellia-128", EVP_camellia_128_ecb());
HANDLE_EVP_CIPHER("Camellia-192", EVP_camellia_192_ecb());
HANDLE_EVP_CIPHER("Camellia-256", EVP_camellia_256_ecb());
#endif
#if !defined(OPENSSL_NO_RC2)
HANDLE_EVP_CIPHER_KEYLEN("RC2", EVP_rc2_ecb(), 1, 32, 1);
#endif
#if !defined(OPENSSL_NO_RC5) && 0
if(request.algo_name() == "RC5")
if(request.arg_as_integer(0, 12) == 12)
return new EVP_BlockCipher(EVP_rc5_32_12_16_ecb(),
"RC5(12)", 1, 32, 1);
#endif
#if !defined(OPENSSL_NO_IDEA) && 0
HANDLE_EVP_CIPHER("IDEA", EVP_idea_ecb());
#endif
#if !defined(OPENSSL_NO_SEED)
HANDLE_EVP_CIPHER("SEED", EVP_seed_ecb());
#endif
#undef HANDLE_EVP_CIPHER
#undef HANDLE_EVP_CIPHER_KEYLEN
return 0;
}
}
|
