/src/botan/src/lib/mac/x919_mac/x919_mac.cpp
Line | Count | Source (jump to first uncovered line) |
1 | | /* |
2 | | * ANSI X9.19 MAC |
3 | | * (C) 1999-2007 Jack Lloyd |
4 | | * |
5 | | * Botan is released under the Simplified BSD License (see license.txt) |
6 | | */ |
7 | | |
8 | | #include <botan/internal/x919_mac.h> |
9 | | |
10 | | namespace Botan { |
11 | | |
12 | | /* |
13 | | * Update an ANSI X9.19 MAC Calculation |
14 | | */ |
15 | | void ANSI_X919_MAC::add_data(const uint8_t input[], size_t length) |
16 | 0 | { |
17 | 0 | verify_key_set(m_state.empty() == false); |
18 | |
|
19 | 0 | size_t xored = std::min(8 - m_position, length); |
20 | 0 | xor_buf(&m_state[m_position], input, xored); |
21 | 0 | m_position += xored; |
22 | |
|
23 | 0 | if(m_position < 8) return; |
24 | | |
25 | 0 | m_des1->encrypt(m_state); |
26 | 0 | input += xored; |
27 | 0 | length -= xored; |
28 | 0 | while(length >= 8) |
29 | 0 | { |
30 | 0 | xor_buf(m_state, input, 8); |
31 | 0 | m_des1->encrypt(m_state); |
32 | 0 | input += 8; |
33 | 0 | length -= 8; |
34 | 0 | } |
35 | |
|
36 | 0 | xor_buf(m_state, input, length); |
37 | 0 | m_position = length; |
38 | 0 | } |
39 | | |
40 | | /* |
41 | | * Finalize an ANSI X9.19 MAC Calculation |
42 | | */ |
43 | | void ANSI_X919_MAC::final_result(uint8_t mac[]) |
44 | 0 | { |
45 | 0 | if(m_position) |
46 | 0 | m_des1->encrypt(m_state); |
47 | 0 | m_des2->decrypt(m_state.data(), mac); |
48 | 0 | m_des1->encrypt(mac); |
49 | 0 | zeroise(m_state); |
50 | 0 | m_position = 0; |
51 | 0 | } |
52 | | |
53 | | /* |
54 | | * ANSI X9.19 MAC Key Schedule |
55 | | */ |
56 | | void ANSI_X919_MAC::key_schedule(const uint8_t key[], size_t length) |
57 | 0 | { |
58 | 0 | m_state.resize(8); |
59 | |
|
60 | 0 | m_des1->set_key(key, 8); |
61 | |
|
62 | 0 | if(length == 16) |
63 | 0 | key += 8; |
64 | |
|
65 | 0 | m_des2->set_key(key, 8); |
66 | 0 | } |
67 | | |
68 | | /* |
69 | | * Clear memory of sensitive data |
70 | | */ |
71 | | void ANSI_X919_MAC::clear() |
72 | 0 | { |
73 | 0 | m_des1->clear(); |
74 | 0 | m_des2->clear(); |
75 | 0 | zap(m_state); |
76 | 0 | m_position = 0; |
77 | 0 | } |
78 | | |
79 | | std::string ANSI_X919_MAC::name() const |
80 | 0 | { |
81 | 0 | return "X9.19-MAC"; |
82 | 0 | } |
83 | | |
84 | | MessageAuthenticationCode* ANSI_X919_MAC::clone() const |
85 | 0 | { |
86 | 0 | return new ANSI_X919_MAC; |
87 | 0 | } |
88 | | |
89 | | /* |
90 | | * ANSI X9.19 MAC Constructor |
91 | | */ |
92 | | ANSI_X919_MAC::ANSI_X919_MAC() : |
93 | | m_des1(BlockCipher::create("DES")), |
94 | | m_des2(m_des1->clone()), |
95 | | m_position(0) |
96 | 0 | { |
97 | 0 | } |
98 | | |
99 | | } |