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
|
/*
* OpenSSL Block Cipher
* (C) 1999-2010,2015 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/internal/block_utils.h>
#include <openssl/evp.h>
namespace Botan {
namespace {
class OpenSSL_BlockCipher : public BlockCipher
{
public:
void clear();
std::string name() const { return cipher_name; }
BlockCipher* clone() const;
size_t block_size() const { return block_sz; }
OpenSSL_BlockCipher(const EVP_CIPHER*, const std::string&);
OpenSSL_BlockCipher(const EVP_CIPHER*, const std::string&,
size_t, size_t, size_t);
Key_Length_Specification key_spec() const { return cipher_key_spec; }
~OpenSSL_BlockCipher();
private:
void 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);
}
void 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);
}
void key_schedule(const byte[], size_t);
size_t block_sz;
Key_Length_Specification cipher_key_spec;
std::string cipher_name;
mutable EVP_CIPHER_CTX encrypt, decrypt;
};
OpenSSL_BlockCipher::OpenSSL_BlockCipher(const EVP_CIPHER* algo,
const std::string& algo_name) :
block_sz(EVP_CIPHER_block_size(algo)),
cipher_key_spec(EVP_CIPHER_key_length(algo)),
cipher_name(algo_name)
{
if(EVP_CIPHER_mode(algo) != EVP_CIPH_ECB_MODE)
throw Invalid_Argument("OpenSSL_BlockCipher: Non-ECB EVP was passed in");
EVP_CIPHER_CTX_init(&encrypt);
EVP_CIPHER_CTX_init(&decrypt);
EVP_EncryptInit_ex(&encrypt, algo, nullptr, nullptr, nullptr);
EVP_DecryptInit_ex(&decrypt, algo, nullptr, nullptr, nullptr);
EVP_CIPHER_CTX_set_padding(&encrypt, 0);
EVP_CIPHER_CTX_set_padding(&decrypt, 0);
}
OpenSSL_BlockCipher::OpenSSL_BlockCipher(const EVP_CIPHER* algo,
const std::string& algo_name,
size_t key_min, size_t key_max,
size_t key_mod) :
block_sz(EVP_CIPHER_block_size(algo)),
cipher_key_spec(key_min, key_max, key_mod),
cipher_name(algo_name)
{
if(EVP_CIPHER_mode(algo) != EVP_CIPH_ECB_MODE)
throw Invalid_Argument("OpenSSL_BlockCipher: Non-ECB EVP was passed in");
EVP_CIPHER_CTX_init(&encrypt);
EVP_CIPHER_CTX_init(&decrypt);
EVP_EncryptInit_ex(&encrypt, algo, nullptr, nullptr, nullptr);
EVP_DecryptInit_ex(&decrypt, algo, nullptr, nullptr, nullptr);
EVP_CIPHER_CTX_set_padding(&encrypt, 0);
EVP_CIPHER_CTX_set_padding(&decrypt, 0);
}
OpenSSL_BlockCipher::~OpenSSL_BlockCipher()
{
EVP_CIPHER_CTX_cleanup(&encrypt);
EVP_CIPHER_CTX_cleanup(&decrypt);
}
/*
* Set the key
*/
void OpenSSL_BlockCipher::key_schedule(const byte key[], size_t length)
{
secure_vector<byte> full_key(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("OpenSSL_BlockCipher: Bad key length for " +
cipher_name);
EVP_EncryptInit_ex(&encrypt, nullptr, nullptr, &full_key[0], nullptr);
EVP_DecryptInit_ex(&decrypt, nullptr, nullptr, &full_key[0], nullptr);
}
/*
* Return a clone of this object
*/
BlockCipher* OpenSSL_BlockCipher::clone() const
{
return new OpenSSL_BlockCipher(EVP_CIPHER_CTX_cipher(&encrypt),
cipher_name,
cipher_key_spec.minimum_keylength(),
cipher_key_spec.maximum_keylength(),
cipher_key_spec.keylength_multiple());
}
/*
* Clear memory of sensitive data
*/
void OpenSSL_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, nullptr, nullptr, nullptr);
EVP_DecryptInit_ex(&decrypt, algo, nullptr, nullptr, nullptr);
EVP_CIPHER_CTX_set_padding(&encrypt, 0);
EVP_CIPHER_CTX_set_padding(&decrypt, 0);
}
std::function<BlockCipher* (const BlockCipher::Spec&)>
make_evp_block_maker(const EVP_CIPHER* cipher, const char* algo)
{
return [cipher,algo](const BlockCipher::Spec&)
{
return new OpenSSL_BlockCipher(cipher, algo);
};
}
std::function<BlockCipher* (const BlockCipher::Spec&)>
make_evp_block_maker_keylen(const EVP_CIPHER* cipher, const char* algo,
size_t kmin, size_t kmax, size_t kmod)
{
return [cipher,algo,kmin,kmax,kmod](const BlockCipher::Spec&)
{
return new OpenSSL_BlockCipher(cipher, algo, kmin, kmax, kmod);
};
}
#define BOTAN_REGISTER_OPENSSL_EVP_BLOCK(NAME, EVP) \
BOTAN_REGISTER_TYPE(BlockCipher, EVP_BlockCipher ## EVP, NAME, \
make_evp_block_maker(EVP(), NAME), "openssl", 96);
#define BOTAN_REGISTER_OPENSSL_EVP_BLOCK_KEYLEN(NAME, EVP, KMIN, KMAX, KMOD) \
BOTAN_REGISTER_TYPE(BlockCipher, OpenSSL_BlockCipher ## EVP, NAME, \
make_evp_block_maker_keylen(EVP(), NAME, KMIN, KMAX, KMOD), \
"openssl", 96);
#if !defined(OPENSSL_NO_AES)
BOTAN_REGISTER_OPENSSL_EVP_BLOCK("AES-128", EVP_aes_128_ecb);
BOTAN_REGISTER_OPENSSL_EVP_BLOCK("AES-192", EVP_aes_192_ecb);
BOTAN_REGISTER_OPENSSL_EVP_BLOCK("AES-256", EVP_aes_256_ecb);
#endif
#if !defined(OPENSSL_NO_DES)
BOTAN_REGISTER_OPENSSL_EVP_BLOCK("DES", EVP_des_ecb);
BOTAN_REGISTER_OPENSSL_EVP_BLOCK_KEYLEN("TripleDES", EVP_des_ede3_ecb, 16, 24, 8);
#endif
#if !defined(OPENSSL_NO_BF)
BOTAN_REGISTER_OPENSSL_EVP_BLOCK_KEYLEN("Blowfish", EVP_bf_ecb, 1, 56, 1);
#endif
#if !defined(OPENSSL_NO_CAST)
BOTAN_REGISTER_OPENSSL_EVP_BLOCK_KEYLEN("CAST-128", EVP_cast5_ecb, 1, 16, 1);
#endif
#if !defined(OPENSSL_NO_CAMELLIA)
BOTAN_REGISTER_OPENSSL_EVP_BLOCK("Camellia-128", EVP_camellia_128_ecb);
BOTAN_REGISTER_OPENSSL_EVP_BLOCK("Camellia-192", EVP_camellia_192_ecb);
BOTAN_REGISTER_OPENSSL_EVP_BLOCK("Camellia-256", EVP_camellia_256_ecb);
#endif
#if !defined(OPENSSL_NO_IDEA)
BOTAN_REGISTER_OPENSSL_EVP_BLOCK("IDEA", EVP_idea_ecb);
#endif
#if !defined(OPENSSL_NO_SEED)
BOTAN_REGISTER_OPENSSL_EVP_BLOCK("SEED", EVP_seed_ecb);
#endif
}
}
|
