Botan  2.15.0
Crypto and TLS for C++11
aead.cpp
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1 /*
2 * (C) 2013,2015 Jack Lloyd
3 *
4 * Botan is released under the Simplified BSD License (see license.txt)
5 */
6 
7 #include <botan/aead.h>
8 #include <botan/scan_name.h>
9 #include <botan/parsing.h>
10 #include <sstream>
11 
12 #if defined(BOTAN_HAS_BLOCK_CIPHER)
13  #include <botan/block_cipher.h>
14 #endif
15 
16 #if defined(BOTAN_HAS_AEAD_CCM)
17  #include <botan/ccm.h>
18 #endif
19 
20 #if defined(BOTAN_HAS_AEAD_CHACHA20_POLY1305)
21  #include <botan/chacha20poly1305.h>
22 #endif
23 
24 #if defined(BOTAN_HAS_AEAD_EAX)
25  #include <botan/eax.h>
26 #endif
27 
28 #if defined(BOTAN_HAS_AEAD_GCM)
29  #include <botan/gcm.h>
30 #endif
31 
32 #if defined(BOTAN_HAS_AEAD_OCB)
33  #include <botan/ocb.h>
34 #endif
35 
36 #if defined(BOTAN_HAS_AEAD_SIV)
37  #include <botan/siv.h>
38 #endif
39 
40 namespace Botan {
41 
42 std::unique_ptr<AEAD_Mode> AEAD_Mode::create_or_throw(const std::string& algo,
43  Cipher_Dir dir,
44  const std::string& provider)
45  {
46  if(auto aead = AEAD_Mode::create(algo, dir, provider))
47  return aead;
48 
49  throw Lookup_Error("AEAD", algo, provider);
50  }
51 
52 std::unique_ptr<AEAD_Mode> AEAD_Mode::create(const std::string& algo,
53  Cipher_Dir dir,
54  const std::string& provider)
55  {
57 #if defined(BOTAN_HAS_AEAD_CHACHA20_POLY1305)
58  if(algo == "ChaCha20Poly1305")
59  {
60  if(dir == ENCRYPTION)
61  return std::unique_ptr<AEAD_Mode>(new ChaCha20Poly1305_Encryption);
62  else
63  return std::unique_ptr<AEAD_Mode>(new ChaCha20Poly1305_Decryption);
64 
65  }
66 #endif
67 
68  if(algo.find('/') != std::string::npos)
69  {
70  const std::vector<std::string> algo_parts = split_on(algo, '/');
71  const std::string cipher_name = algo_parts[0];
72  const std::vector<std::string> mode_info = parse_algorithm_name(algo_parts[1]);
73 
74  if(mode_info.empty())
75  return std::unique_ptr<AEAD_Mode>();
76 
77  std::ostringstream alg_args;
78 
79  alg_args << '(' << cipher_name;
80  for(size_t i = 1; i < mode_info.size(); ++i)
81  alg_args << ',' << mode_info[i];
82  for(size_t i = 2; i < algo_parts.size(); ++i)
83  alg_args << ',' << algo_parts[i];
84  alg_args << ')';
85 
86  const std::string mode_name = mode_info[0] + alg_args.str();
87  return AEAD_Mode::create(mode_name, dir);
88  }
89 
90 #if defined(BOTAN_HAS_BLOCK_CIPHER)
91 
92  SCAN_Name req(algo);
93 
94  if(req.arg_count() == 0)
95  {
96  return std::unique_ptr<AEAD_Mode>();
97  }
98 
99  std::unique_ptr<BlockCipher> bc(BlockCipher::create(req.arg(0), provider));
100 
101  if(!bc)
102  {
103  return std::unique_ptr<AEAD_Mode>();
104  }
105 
106 #if defined(BOTAN_HAS_AEAD_CCM)
107  if(req.algo_name() == "CCM")
108  {
109  size_t tag_len = req.arg_as_integer(1, 16);
110  size_t L_len = req.arg_as_integer(2, 3);
111  if(dir == ENCRYPTION)
112  return std::unique_ptr<AEAD_Mode>(new CCM_Encryption(bc.release(), tag_len, L_len));
113  else
114  return std::unique_ptr<AEAD_Mode>(new CCM_Decryption(bc.release(), tag_len, L_len));
115  }
116 #endif
117 
118 #if defined(BOTAN_HAS_AEAD_GCM)
119  if(req.algo_name() == "GCM")
120  {
121  size_t tag_len = req.arg_as_integer(1, 16);
122  if(dir == ENCRYPTION)
123  return std::unique_ptr<AEAD_Mode>(new GCM_Encryption(bc.release(), tag_len));
124  else
125  return std::unique_ptr<AEAD_Mode>(new GCM_Decryption(bc.release(), tag_len));
126  }
127 #endif
128 
129 #if defined(BOTAN_HAS_AEAD_OCB)
130  if(req.algo_name() == "OCB")
131  {
132  size_t tag_len = req.arg_as_integer(1, 16);
133  if(dir == ENCRYPTION)
134  return std::unique_ptr<AEAD_Mode>(new OCB_Encryption(bc.release(), tag_len));
135  else
136  return std::unique_ptr<AEAD_Mode>(new OCB_Decryption(bc.release(), tag_len));
137  }
138 #endif
139 
140 #if defined(BOTAN_HAS_AEAD_EAX)
141  if(req.algo_name() == "EAX")
142  {
143  size_t tag_len = req.arg_as_integer(1, bc->block_size());
144  if(dir == ENCRYPTION)
145  return std::unique_ptr<AEAD_Mode>(new EAX_Encryption(bc.release(), tag_len));
146  else
147  return std::unique_ptr<AEAD_Mode>(new EAX_Decryption(bc.release(), tag_len));
148  }
149 #endif
150 
151 #if defined(BOTAN_HAS_AEAD_SIV)
152  if(req.algo_name() == "SIV")
153  {
154  if(dir == ENCRYPTION)
155  return std::unique_ptr<AEAD_Mode>(new SIV_Encryption(bc.release()));
156  else
157  return std::unique_ptr<AEAD_Mode>(new SIV_Decryption(bc.release()));
158  }
159 #endif
160 
161 #endif
162 
163  return std::unique_ptr<AEAD_Mode>();
164  }
165 
166 
167 
168 }
size_t arg_count() const
Definition: scan_name.h:56
std::vector< std::string > split_on(const std::string &str, char delim)
Definition: parsing.cpp:148
size_t arg_as_integer(size_t i, size_t def_value) const
Definition: scan_name.cpp:139
std::string arg(size_t i) const
Definition: scan_name.cpp:124
static std::unique_ptr< AEAD_Mode > create(const std::string &algo, Cipher_Dir direction, const std::string &provider="")
Definition: aead.cpp:52
std::vector< std::string > parse_algorithm_name(const std::string &namex)
Definition: parsing.cpp:95
Definition: alg_id.cpp:13
#define BOTAN_UNUSED(...)
Definition: assert.h:142
static std::unique_ptr< BlockCipher > create(const std::string &algo_spec, const std::string &provider="")
const std::string & algo_name() const
Definition: scan_name.h:51
Cipher_Dir
Definition: cipher_mode.h:23
virtual std::string provider() const
Definition: cipher_mode.h:180
static std::unique_ptr< AEAD_Mode > create_or_throw(const std::string &algo, Cipher_Dir direction, const std::string &provider="")
Definition: aead.cpp:42