/src/Botan-3.4.0/src/lib/stream/stream_cipher.cpp
Line | Count | Source (jump to first uncovered line) |
1 | | /* |
2 | | * Stream Ciphers |
3 | | * (C) 2015,2016 Jack Lloyd |
4 | | * |
5 | | * Botan is released under the Simplified BSD License (see license.txt) |
6 | | */ |
7 | | |
8 | | #include <botan/stream_cipher.h> |
9 | | |
10 | | #include <botan/exceptn.h> |
11 | | #include <botan/mem_ops.h> |
12 | | #include <botan/internal/scan_name.h> |
13 | | |
14 | | #if defined(BOTAN_HAS_CHACHA) |
15 | | #include <botan/internal/chacha.h> |
16 | | #endif |
17 | | |
18 | | #if defined(BOTAN_HAS_SALSA20) |
19 | | #include <botan/internal/salsa20.h> |
20 | | #endif |
21 | | |
22 | | #if defined(BOTAN_HAS_SHAKE_CIPHER) |
23 | | #include <botan/internal/shake_cipher.h> |
24 | | #endif |
25 | | |
26 | | #if defined(BOTAN_HAS_CTR_BE) |
27 | | #include <botan/internal/ctr.h> |
28 | | #endif |
29 | | |
30 | | #if defined(BOTAN_HAS_OFB) |
31 | | #include <botan/internal/ofb.h> |
32 | | #endif |
33 | | |
34 | | #if defined(BOTAN_HAS_RC4) |
35 | | #include <botan/internal/rc4.h> |
36 | | #endif |
37 | | |
38 | | namespace Botan { |
39 | | |
40 | 0 | std::unique_ptr<StreamCipher> StreamCipher::create(std::string_view algo_spec, std::string_view provider) { |
41 | | #if defined(BOTAN_HAS_SHAKE_CIPHER) |
42 | | if(algo_spec == "SHAKE-128" || algo_spec == "SHAKE-128-XOF") { |
43 | | if(provider.empty() || provider == "base") { |
44 | | return std::make_unique<SHAKE_128_Cipher>(); |
45 | | } |
46 | | } |
47 | | |
48 | | if(algo_spec == "SHAKE-256" || algo_spec == "SHAKE-256-XOF") { |
49 | | if(provider.empty() || provider == "base") { |
50 | | return std::make_unique<SHAKE_256_Cipher>(); |
51 | | } |
52 | | } |
53 | | #endif |
54 | |
|
55 | | #if defined(BOTAN_HAS_CHACHA) |
56 | | if(algo_spec == "ChaCha20") { |
57 | | if(provider.empty() || provider == "base") { |
58 | | return std::make_unique<ChaCha>(20); |
59 | | } |
60 | | } |
61 | | #endif |
62 | |
|
63 | | #if defined(BOTAN_HAS_SALSA20) |
64 | | if(algo_spec == "Salsa20") { |
65 | | if(provider.empty() || provider == "base") { |
66 | | return std::make_unique<Salsa20>(); |
67 | | } |
68 | | } |
69 | | #endif |
70 | |
|
71 | 0 | const SCAN_Name req(algo_spec); |
72 | |
|
73 | 0 | #if defined(BOTAN_HAS_CTR_BE) |
74 | 0 | if((req.algo_name() == "CTR-BE" || req.algo_name() == "CTR") && req.arg_count_between(1, 2)) { |
75 | 0 | if(provider.empty() || provider == "base") { |
76 | 0 | auto cipher = BlockCipher::create(req.arg(0)); |
77 | 0 | if(cipher) { |
78 | 0 | size_t ctr_size = req.arg_as_integer(1, cipher->block_size()); |
79 | 0 | return std::make_unique<CTR_BE>(std::move(cipher), ctr_size); |
80 | 0 | } |
81 | 0 | } |
82 | 0 | } |
83 | 0 | #endif |
84 | | |
85 | | #if defined(BOTAN_HAS_CHACHA) |
86 | | if(req.algo_name() == "ChaCha") { |
87 | | if(provider.empty() || provider == "base") { |
88 | | return std::make_unique<ChaCha>(req.arg_as_integer(0, 20)); |
89 | | } |
90 | | } |
91 | | #endif |
92 | | |
93 | | #if defined(BOTAN_HAS_OFB) |
94 | | if(req.algo_name() == "OFB" && req.arg_count() == 1) { |
95 | | if(provider.empty() || provider == "base") { |
96 | | if(auto cipher = BlockCipher::create(req.arg(0))) { |
97 | | return std::make_unique<OFB>(std::move(cipher)); |
98 | | } |
99 | | } |
100 | | } |
101 | | #endif |
102 | | |
103 | | #if defined(BOTAN_HAS_RC4) |
104 | | |
105 | | if(req.algo_name() == "RC4" || req.algo_name() == "ARC4" || req.algo_name() == "MARK-4") { |
106 | | const size_t skip = (req.algo_name() == "MARK-4") ? 256 : req.arg_as_integer(0, 0); |
107 | | |
108 | | if(provider.empty() || provider == "base") { |
109 | | return std::make_unique<RC4>(skip); |
110 | | } |
111 | | } |
112 | | |
113 | | #endif |
114 | | |
115 | 0 | BOTAN_UNUSED(req); |
116 | 0 | BOTAN_UNUSED(provider); |
117 | |
|
118 | 0 | return nullptr; |
119 | 0 | } |
120 | | |
121 | | //static |
122 | 0 | std::unique_ptr<StreamCipher> StreamCipher::create_or_throw(std::string_view algo, std::string_view provider) { |
123 | 0 | if(auto sc = StreamCipher::create(algo, provider)) { |
124 | 0 | return sc; |
125 | 0 | } |
126 | 0 | throw Lookup_Error("Stream cipher", algo, provider); |
127 | 0 | } |
128 | | |
129 | 0 | std::vector<std::string> StreamCipher::providers(std::string_view algo_spec) { |
130 | 0 | return probe_providers_of<StreamCipher>(algo_spec); |
131 | 0 | } |
132 | | |
133 | 0 | size_t StreamCipher::default_iv_length() const { |
134 | 0 | return 0; |
135 | 0 | } |
136 | | |
137 | 0 | void StreamCipher::generate_keystream(uint8_t out[], size_t len) { |
138 | 0 | clear_mem(out, len); |
139 | 0 | cipher1(out, len); |
140 | 0 | } |
141 | | |
142 | | } // namespace Botan |