9 #include <botan/internal/def_powm.h>
10 #include <botan/numthry.h>
11 #include <botan/internal/mp_core.h>
21 m_exp_bits = exp.
bits();
31 m_g.resize((1 << m_window_bits));
39 m_modulus.
data(), m_mod_words, m_mod_prime,
43 m_g[1] = m_reducer.
reduce(base);
46 m_modulus.
data(), m_mod_words, m_mod_prime,
53 for(
size_t i = 2; i != m_g.size(); ++i)
55 const BigInt& y = m_g[i-1];
69 const size_t exp_nibbles = (m_exp_bits + m_window_bits - 1) / m_window_bits;
73 const size_t z_size = 2*(m_mod_words + 1);
78 for(
size_t i = exp_nibbles; i > 0; --i)
80 for(
size_t k = 0; k != m_window_bits; ++k)
88 const uint32_t nibble = m_exp.
get_substring(m_window_bits*(i-1), m_window_bits);
91 m_modulus.
data(), m_mod_words, m_mod_prime,
100 m_modulus.
data(), m_mod_words, m_mod_prime,
112 m_reducer(m_modulus),
113 m_mod_words(m_modulus.sig_words()),
124 m_R_mod = m_reducer.
reduce(r);
125 m_R2_mod = m_reducer.
square(m_R_mod);
word word_at(size_t n) const
BigInt execute() const override
void set_exponent(const BigInt &) override
std::vector< T, secure_allocator< T >> secure_vector
void bigint_monty_sqr(BigInt &z, const BigInt &x, const word p[], size_t p_size, word p_dash, word workspace[])
Montgomery_Exponentiator(const BigInt &, Power_Mod::Usage_Hints)
void set_base(const BigInt &) override
void bigint_monty_mul(BigInt &z, const BigInt &x, const BigInt &y, const word p[], size_t p_size, word p_dash, word workspace[])
const word * data() const
static BigInt power_of_2(size_t n)
BigInt reduce(const BigInt &x) const
static size_t window_bits(size_t exp_bits, size_t base_bits, Power_Mod::Usage_Hints hints)
uint32_t get_substring(size_t offset, size_t length) const
word monty_inverse(word input)
void bigint_monty_redc(word z[], const word p[], size_t p_size, word p_dash, word workspace[])
BigInt square(const BigInt &x) const