Montgomery_Int::Montgomery_Int(std::shared_ptr<const Montgomery_Params> params,
const word words[], size_t len,
bool redc_needed) :
m_params(params),
m_v(words, len)
{
if(redc_needed)
{
BOTAN_ASSERT_NOMSG(m_v < m_params->p());
secure_vector<word> ws;
m_v = m_params->mul(m_v, m_params->R2(), ws);
}
}
Montgomery_Int::Montgomery_Int(const std::shared_ptr<const Montgomery_Params> params,
const BigInt& v,
bool redc_needed) :
m_params(params)
{
if(redc_needed == false)
{
m_v = v;
}
else
{
BOTAN_ASSERT_NOMSG(m_v < m_params->p());
secure_vector<word> ws;
m_v = m_params->mul(v, m_params->R2(), ws);
}
}
void Blowfish::key_expansion(const uint8_t key[],
size_t length,
const uint8_t salt[],
size_t salt_length)
{
BOTAN_ASSERT_NOMSG(salt_length % 4 == 0);
for(size_t i = 0, j = 0; i != 18; ++i, j += 4)
m_P[i] ^= make_uint32(key[(j ) % length], key[(j+1) % length],
key[(j+2) % length], key[(j+3) % length]);
const size_t P_salt_offset = (salt_length > 0) ? 18 % (salt_length / 4) : 0;
uint32_t L = 0, R = 0;
generate_sbox(m_P, L, R, salt, salt_length, 0);
generate_sbox(m_S, L, R, salt, salt_length, P_salt_offset);
}