8#include <botan/comb4p.h>
9#include <botan/exceptn.h>
15void comb4p_round(secure_vector<uint8_t>& out,
16 const secure_vector<uint8_t>& in,
24 h1.update(in.data(), in.size());
25 h2.update(in.data(), in.size());
27 secure_vector<uint8_t> h_buf = h1.final();
28 xor_buf(out.data(), h_buf.data(), std::min(out.size(), h_buf.size()));
31 xor_buf(out.data(), h_buf.data(), std::min(out.size(), h_buf.size()));
37 m_hash1(h1), m_hash2(h2)
39 if(m_hash1->name() == m_hash2->name())
42 if(m_hash1->output_length() != m_hash2->output_length())
44 m_hash1->name() +
" and " +
52 if(m_hash1->hash_block_size() == m_hash2->hash_block_size())
53 return m_hash1->hash_block_size();
74 std::unique_ptr<Comb4P> copy(
new Comb4P);
75 copy->m_hash1 = m_hash1->copy_state();
76 copy->m_hash2 = m_hash2->copy_state();
78 return std::unique_ptr<HashFunction>(copy.release());
81void Comb4P::add_data(
const uint8_t input[],
size_t length)
83 m_hash1->update(input, length);
84 m_hash2->update(input, length);
87void Comb4P::final_result(uint8_t out[])
89 secure_vector<uint8_t> h1 = m_hash1->final();
90 secure_vector<uint8_t> h2 = m_hash2->final();
93 xor_buf(h1.data(), h2.data(), std::min(h1.size(), h2.size()));
96 comb4p_round(h2, h1, 1, *m_hash1, *m_hash2);
99 comb4p_round(h1, h2, 2, *m_hash1, *m_hash2);
101 copy_mem(out , h1.data(), h1.size());
102 copy_mem(out + h1.size(), h2.data(), h2.size());
std::unique_ptr< HashFunction > copy_state() const override
size_t hash_block_size() const override
void copy_mem(T *out, const T *in, size_t n)
void xor_buf(uint8_t out[], const uint8_t in[], size_t length)