1 /*
2 * Poly1305
3 * (C) 2014 Jack Lloyd
4 *
5 * Botan is released under the Simplified BSD License (see license.txt)
6 */
7 
8 #ifndef BOTAN_MAC_POLY1305_H_
9 #define BOTAN_MAC_POLY1305_H_
10 
11 #include <botan/mac.h>
12 #include <memory>
13 
14 BOTAN_FUTURE_INTERNAL_HEADER(poly1305.h)
15 
16 namespace Botan {
17 
18 /**
19 * DJB's Poly1305
20 * Important note: each key can only be used once
21 */
22 class BOTAN_PUBLIC_API(2,0) Poly1305 final : public MessageAuthenticationCode
23    {
24    public:
name()25       std::string name() const override { return "Poly1305"; }
26 
clone()27       MessageAuthenticationCode* clone() const override { return new Poly1305; }
28 
29       void clear() override;
30 
output_length()31       size_t output_length() const override { return 16; }
32 
key_spec()33       Key_Length_Specification key_spec() const override
34          {
35          return Key_Length_Specification(32);
36          }
37 
38    private:
39       void add_data(const uint8_t[], size_t) override;
40       void final_result(uint8_t[]) override;
41       void key_schedule(const uint8_t[], size_t) override;
42 
43       secure_vector<uint64_t> m_poly;
44       secure_vector<uint8_t> m_buf;
45       size_t m_buf_pos = 0;
46    };
47 
48 }
49 
50 #endif
51