/src/botan/src/lib/modes/cipher_mode.cpp
Line | Count | Source (jump to first uncovered line) |
1 | | /* |
2 | | * Cipher Modes |
3 | | * (C) 2015 Jack Lloyd |
4 | | * |
5 | | * Botan is released under the Simplified BSD License (see license.txt) |
6 | | */ |
7 | | |
8 | | #include <botan/cipher_mode.h> |
9 | | #include <botan/internal/stream_mode.h> |
10 | | #include <botan/internal/scan_name.h> |
11 | | #include <botan/internal/parsing.h> |
12 | | #include <sstream> |
13 | | |
14 | | #if defined(BOTAN_HAS_BLOCK_CIPHER) |
15 | | #include <botan/block_cipher.h> |
16 | | #endif |
17 | | |
18 | | #if defined(BOTAN_HAS_AEAD_MODES) |
19 | | #include <botan/aead.h> |
20 | | #endif |
21 | | |
22 | | #if defined(BOTAN_HAS_MODE_CBC) |
23 | | #include <botan/internal/cbc.h> |
24 | | #endif |
25 | | |
26 | | #if defined(BOTAN_HAS_MODE_CFB) |
27 | | #include <botan/internal/cfb.h> |
28 | | #endif |
29 | | |
30 | | #if defined(BOTAN_HAS_MODE_XTS) |
31 | | #include <botan/internal/xts.h> |
32 | | #endif |
33 | | |
34 | | #if defined(BOTAN_HAS_COMMONCRYPTO) |
35 | | #include <botan/internal/commoncrypto.h> |
36 | | #endif |
37 | | |
38 | | namespace Botan { |
39 | | |
40 | | std::unique_ptr<Cipher_Mode> Cipher_Mode::create_or_throw(const std::string& algo, |
41 | | Cipher_Dir direction, |
42 | | const std::string& provider) |
43 | 0 | { |
44 | 0 | if(auto mode = Cipher_Mode::create(algo, direction, provider)) |
45 | 0 | return mode; |
46 | | |
47 | 0 | throw Lookup_Error("Cipher mode", algo, provider); |
48 | 0 | } |
49 | | |
50 | | std::unique_ptr<Cipher_Mode> Cipher_Mode::create(const std::string& algo, |
51 | | Cipher_Dir direction, |
52 | | const std::string& provider) |
53 | 0 | { |
54 | | #if defined(BOTAN_HAS_COMMONCRYPTO) |
55 | | if(provider.empty() || provider == "commoncrypto") |
56 | | { |
57 | | std::unique_ptr<Cipher_Mode> commoncrypto_cipher(make_commoncrypto_cipher_mode(algo, direction)); |
58 | | |
59 | | if(commoncrypto_cipher) |
60 | | return commoncrypto_cipher; |
61 | | |
62 | | if(!provider.empty()) |
63 | | return std::unique_ptr<Cipher_Mode>(); |
64 | | } |
65 | | #endif |
66 | |
|
67 | 0 | #if defined(BOTAN_HAS_STREAM_CIPHER) |
68 | 0 | if(auto sc = StreamCipher::create(algo)) |
69 | 0 | { |
70 | 0 | return std::make_unique<Stream_Cipher_Mode>(std::move(sc)); |
71 | 0 | } |
72 | 0 | #endif |
73 | | |
74 | 0 | #if defined(BOTAN_HAS_AEAD_MODES) |
75 | 0 | if(auto aead = AEAD_Mode::create(algo, direction)) |
76 | 0 | { |
77 | 0 | return aead; |
78 | 0 | } |
79 | 0 | #endif |
80 | | |
81 | 0 | if(algo.find('/') != std::string::npos) |
82 | 0 | { |
83 | 0 | const std::vector<std::string> algo_parts = split_on(algo, '/'); |
84 | 0 | const std::string cipher_name = algo_parts[0]; |
85 | 0 | const std::vector<std::string> mode_info = parse_algorithm_name(algo_parts[1]); |
86 | |
|
87 | 0 | if(mode_info.empty()) |
88 | 0 | return std::unique_ptr<Cipher_Mode>(); |
89 | | |
90 | 0 | std::ostringstream mode_name; |
91 | |
|
92 | 0 | mode_name << mode_info[0] << '(' << cipher_name; |
93 | 0 | for(size_t i = 1; i < mode_info.size(); ++i) |
94 | 0 | mode_name << ',' << mode_info[i]; |
95 | 0 | for(size_t i = 2; i < algo_parts.size(); ++i) |
96 | 0 | mode_name << ',' << algo_parts[i]; |
97 | 0 | mode_name << ')'; |
98 | |
|
99 | 0 | return Cipher_Mode::create(mode_name.str(), direction, provider); |
100 | 0 | } |
101 | | |
102 | 0 | #if defined(BOTAN_HAS_BLOCK_CIPHER) |
103 | | |
104 | 0 | SCAN_Name spec(algo); |
105 | |
|
106 | 0 | if(spec.arg_count() == 0) |
107 | 0 | { |
108 | 0 | return std::unique_ptr<Cipher_Mode>(); |
109 | 0 | } |
110 | | |
111 | 0 | std::unique_ptr<BlockCipher> bc(BlockCipher::create(spec.arg(0), provider)); |
112 | |
|
113 | 0 | if(!bc) |
114 | 0 | { |
115 | 0 | return std::unique_ptr<Cipher_Mode>(); |
116 | 0 | } |
117 | | |
118 | 0 | #if defined(BOTAN_HAS_MODE_CBC) |
119 | 0 | if(spec.algo_name() == "CBC") |
120 | 0 | { |
121 | 0 | const std::string padding = spec.arg(1, "PKCS7"); |
122 | |
|
123 | 0 | if(padding == "CTS") |
124 | 0 | { |
125 | 0 | if(direction == ENCRYPTION) |
126 | 0 | return std::make_unique<CTS_Encryption>(std::move(bc)); |
127 | 0 | else |
128 | 0 | return std::make_unique<CTS_Decryption>(std::move(bc)); |
129 | 0 | } |
130 | 0 | else |
131 | 0 | { |
132 | 0 | auto pad = BlockCipherModePaddingMethod::create(padding); |
133 | |
|
134 | 0 | if(pad) |
135 | 0 | { |
136 | 0 | if(direction == ENCRYPTION) |
137 | 0 | return std::make_unique<CBC_Encryption>(std::move(bc), std::move(pad)); |
138 | 0 | else |
139 | 0 | return std::make_unique<CBC_Decryption>(std::move(bc), std::move(pad)); |
140 | 0 | } |
141 | 0 | } |
142 | 0 | } |
143 | 0 | #endif |
144 | | |
145 | 0 | #if defined(BOTAN_HAS_MODE_XTS) |
146 | 0 | if(spec.algo_name() == "XTS") |
147 | 0 | { |
148 | 0 | if(direction == ENCRYPTION) |
149 | 0 | return std::make_unique<XTS_Encryption>(std::move(bc)); |
150 | 0 | else |
151 | 0 | return std::make_unique<XTS_Decryption>(std::move(bc)); |
152 | 0 | } |
153 | 0 | #endif |
154 | | |
155 | 0 | #if defined(BOTAN_HAS_MODE_CFB) |
156 | 0 | if(spec.algo_name() == "CFB") |
157 | 0 | { |
158 | 0 | const size_t feedback_bits = spec.arg_as_integer(1, 8*bc->block_size()); |
159 | 0 | if(direction == ENCRYPTION) |
160 | 0 | return std::make_unique<CFB_Encryption>(std::move(bc), feedback_bits); |
161 | 0 | else |
162 | 0 | return std::make_unique<CFB_Decryption>(std::move(bc), feedback_bits); |
163 | 0 | } |
164 | 0 | #endif |
165 | | |
166 | 0 | #endif |
167 | | |
168 | 0 | return std::unique_ptr<Cipher_Mode>(); |
169 | 0 | } |
170 | | |
171 | | //static |
172 | | std::vector<std::string> Cipher_Mode::providers(const std::string& algo_spec) |
173 | 0 | { |
174 | 0 | const std::vector<std::string>& possible = { "base", "commoncrypto" }; |
175 | 0 | std::vector<std::string> providers; |
176 | 0 | for(auto&& prov : possible) |
177 | 0 | { |
178 | 0 | std::unique_ptr<Cipher_Mode> mode = Cipher_Mode::create(algo_spec, ENCRYPTION, prov); |
179 | 0 | if(mode) |
180 | 0 | { |
181 | 0 | providers.push_back(prov); // available |
182 | 0 | } |
183 | 0 | } |
184 | 0 | return providers; |
185 | 0 | } |
186 | | |
187 | | } |