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/*
* BLAKE2b
* (C) 2016 cynecx
* (C) 2017 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/blake2b.h>
#include <botan/exceptn.h>
#include <botan/mem_ops.h>
#include <botan/loadstor.h>
#include <botan/rotate.h>
#include <algorithm>
namespace Botan {
namespace {
enum blake2b_constant {
BLAKE2B_BLOCKBYTES = 128,
BLAKE2B_IVU64COUNT = 8
};
const uint64_t blake2b_IV[BLAKE2B_IVU64COUNT] = {
0x6a09e667f3bcc908, 0xbb67ae8584caa73b,
0x3c6ef372fe94f82b, 0xa54ff53a5f1d36f1,
0x510e527fade682d1, 0x9b05688c2b3e6c1f,
0x1f83d9abfb41bd6b, 0x5be0cd19137e2179
};
}
BLAKE2b::BLAKE2b(size_t output_bits) :
m_output_bits(output_bits),
m_buffer(BLAKE2B_BLOCKBYTES),
m_bufpos(0),
m_H(BLAKE2B_IVU64COUNT)
{
if(output_bits == 0 || output_bits > 512 || output_bits % 8 != 0)
{
throw Invalid_Argument("Bad output bits size for BLAKE2b");
}
state_init();
}
void BLAKE2b::state_init()
{
copy_mem(m_H.data(), blake2b_IV, BLAKE2B_IVU64COUNT);
m_H[0] ^= 0x01010000 ^ static_cast<uint8_t>(output_length());
m_T[0] = m_T[1] = 0;
m_F[0] = m_F[1] = 0;
m_bufpos = 0;
}
namespace {
BOTAN_FORCE_INLINE void G(uint64_t& a, uint64_t& b, uint64_t& c, uint64_t& d,
uint64_t M0, uint64_t M1)
{
a = a + b + M0;
d = rotr<32>(d ^ a);
c = c + d;
b = rotr<24>(b ^ c);
a = a + b + M1;
d = rotr<16>(d ^ a);
c = c + d;
b = rotr<63>(b ^ c);
}
template<size_t i0, size_t i1, size_t i2, size_t i3, size_t i4, size_t i5, size_t i6, size_t i7,
size_t i8, size_t i9, size_t iA, size_t iB, size_t iC, size_t iD, size_t iE, size_t iF>
BOTAN_FORCE_INLINE void ROUND(uint64_t* v, const uint64_t* M)
{
G(v[ 0], v[ 4], v[ 8], v[12], M[i0], M[i1]);
G(v[ 1], v[ 5], v[ 9], v[13], M[i2], M[i3]);
G(v[ 2], v[ 6], v[10], v[14], M[i4], M[i5]);
G(v[ 3], v[ 7], v[11], v[15], M[i6], M[i7]);
G(v[ 0], v[ 5], v[10], v[15], M[i8], M[i9]);
G(v[ 1], v[ 6], v[11], v[12], M[iA], M[iB]);
G(v[ 2], v[ 7], v[ 8], v[13], M[iC], M[iD]);
G(v[ 3], v[ 4], v[ 9], v[14], M[iE], M[iF]);
}
}
void BLAKE2b::compress(const uint8_t* input, size_t blocks, uint64_t increment)
{
for(size_t b = 0; b != blocks; ++b)
{
m_T[0] += increment;
if(m_T[0] < increment)
{
m_T[1]++;
}
uint64_t M[16];
uint64_t v[16];
load_le(M, input, 16);
input += BLAKE2B_BLOCKBYTES;
for(size_t i = 0; i < 8; i++)
v[i] = m_H[i];
for(size_t i = 0; i != 8; ++i)
v[i + 8] = blake2b_IV[i];
v[12] ^= m_T[0];
v[13] ^= m_T[1];
v[14] ^= m_F[0];
v[15] ^= m_F[1];
ROUND< 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15>(v, M);
ROUND<14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3>(v, M);
ROUND<11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4>(v, M);
ROUND< 7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8>(v, M);
ROUND< 9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13>(v, M);
ROUND< 2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9>(v, M);
ROUND<12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11>(v, M);
ROUND<13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10>(v, M);
ROUND< 6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5>(v, M);
ROUND<10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13, 0>(v, M);
ROUND< 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15>(v, M);
ROUND<14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3>(v, M);
for(size_t i = 0; i < 8; i++)
{
m_H[i] ^= v[i] ^ v[i + 8];
}
}
}
void BLAKE2b::add_data(const uint8_t input[], size_t length)
{
if(length == 0)
return;
if(m_bufpos > 0)
{
if(m_bufpos < BLAKE2B_BLOCKBYTES)
{
const size_t take = std::min(BLAKE2B_BLOCKBYTES - m_bufpos, length);
copy_mem(&m_buffer[m_bufpos], input, take);
m_bufpos += take;
length -= take;
input += take;
}
if(m_bufpos == m_buffer.size() && length > 0)
{
compress(m_buffer.data(), 1, BLAKE2B_BLOCKBYTES);
m_bufpos = 0;
}
}
if(length > BLAKE2B_BLOCKBYTES)
{
const size_t full_blocks = ((length-1) / BLAKE2B_BLOCKBYTES);
compress(input, full_blocks, BLAKE2B_BLOCKBYTES);
input += full_blocks * BLAKE2B_BLOCKBYTES;
length -= full_blocks * BLAKE2B_BLOCKBYTES;
}
if(length > 0)
{
copy_mem(&m_buffer[m_bufpos], input, length);
m_bufpos += length;
}
}
void BLAKE2b::final_result(uint8_t output[])
{
if(m_bufpos != BLAKE2B_BLOCKBYTES)
clear_mem(&m_buffer[m_bufpos], BLAKE2B_BLOCKBYTES - m_bufpos);
m_F[0] = 0xFFFFFFFFFFFFFFFF;
compress(m_buffer.data(), 1, m_bufpos);
copy_out_vec_le(output, output_length(), m_H);
state_init();
}
std::string BLAKE2b::name() const
{
return "BLAKE2b(" + std::to_string(m_output_bits) + ")";
}
HashFunction* BLAKE2b::clone() const
{
return new BLAKE2b(m_output_bits);
}
std::unique_ptr<HashFunction> BLAKE2b::copy_state() const
{
return std::unique_ptr<HashFunction>(new BLAKE2b(*this));
}
void BLAKE2b::clear()
{
zeroise(m_H);
zeroise(m_buffer);
m_bufpos = 0;
state_init();
}
}
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