diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/math/bigint/bigint.h | 10 | ||||
| -rw-r--r-- | src/math/numbertheory/powm_mnt.cpp | 39 |
2 files changed, 24 insertions, 25 deletions
diff --git a/src/math/bigint/bigint.h b/src/math/bigint/bigint.h index 4d3e37708..bf1e8bb0e 100644 --- a/src/math/bigint/bigint.h +++ b/src/math/bigint/bigint.h @@ -304,15 +304,6 @@ class BOTAN_DLL BigInt const word* data() const { return &m_reg[0]; } /** - * Assign using a plain word array - */ - void assign(const word x[], size_t length) - { - m_reg.resize(length); - copy_mem(&m_reg[0], x, length); - } - - /** * Increase internal register buffer to at least n words * @param n new size of register */ @@ -363,7 +354,6 @@ class BOTAN_DLL BigInt const BigInt& min, const BigInt& max); - /** * Create a power of two * @param n the power of two to create diff --git a/src/math/numbertheory/powm_mnt.cpp b/src/math/numbertheory/powm_mnt.cpp index a8155bbfb..416f430b7 100644 --- a/src/math/numbertheory/powm_mnt.cpp +++ b/src/math/numbertheory/powm_mnt.cpp @@ -1,6 +1,6 @@ /* * Montgomery Exponentiation -* (C) 1999-2010 Jack Lloyd +* (C) 1999-2010,2012 Jack Lloyd * * Distributed under the terms of the Botan license */ @@ -79,18 +79,19 @@ void Montgomery_Exponentiator::set_base(const BigInt& base) m_g.resize((1 << m_window_bits) - 1); - secure_vector<word> z(2 * (m_mod_words + 1)); + BigInt z(BigInt::Positive, 2 * (m_mod_words + 1)); secure_vector<word> workspace(z.size()); m_g[0] = (base >= m_modulus) ? (base % m_modulus) : base; - bigint_monty_mul(&z[0], z.size(), + bigint_monty_mul(z.mutable_data(), z.size(), m_g[0].data(), m_g[0].size(), m_g[0].sig_words(), m_R2_mod.data(), m_R2_mod.size(), m_R2_mod.sig_words(), m_modulus.data(), m_mod_words, m_mod_prime, &workspace[0]); - m_g[0].assign(&z[0], m_mod_words + 1); + z.mask_bits(BOTAN_MP_WORD_BITS * (m_mod_words + 1)); + m_g[0] = z; const BigInt& x = m_g[0]; const size_t x_sig = x.sig_words(); @@ -100,14 +101,16 @@ void Montgomery_Exponentiator::set_base(const BigInt& base) const BigInt& y = m_g[i-1]; const size_t y_sig = y.sig_words(); - zeroise(z); - bigint_monty_mul(&z[0], z.size(), + z.clear(); + + bigint_monty_mul(z.mutable_data(), z.size(), x.data(), x.size(), x_sig, y.data(), y.size(), y_sig, m_modulus.data(), m_mod_words, m_mod_prime, &workspace[0]); - m_g[i].assign(&z[0], m_mod_words + 1); + z.mask_bits(BOTAN_MP_WORD_BITS * (m_mod_words + 1)); + m_g[i] = z; } } @@ -119,35 +122,41 @@ BigInt Montgomery_Exponentiator::execute() const const size_t exp_nibbles = (m_exp_bits + m_window_bits - 1) / m_window_bits; BigInt x = m_R_mod; - secure_vector<word> z(2 * (m_mod_words + 1)); - secure_vector<word> workspace(2 * (m_mod_words + 1)); + + const size_t z_size = 2*(m_mod_words + 1); + + BigInt z(BigInt::Positive, z_size); + secure_vector<word> workspace(z_size); for(size_t i = exp_nibbles; i > 0; --i) { for(size_t k = 0; k != m_window_bits; ++k) { - zeroise(z); + z.clear(); - bigint_monty_sqr(&z[0], z.size(), + bigint_monty_sqr(z.mutable_data(), z_size, x.data(), x.size(), x.sig_words(), m_modulus.data(), m_mod_words, m_mod_prime, &workspace[0]); - x.assign(&z[0], m_mod_words + 1); + z.mask_bits(BOTAN_MP_WORD_BITS * (m_mod_words + 1)); + x = z; } if(u32bit nibble = m_exp.get_substring(m_window_bits*(i-1), m_window_bits)) { const BigInt& y = m_g[nibble-1]; - zeroise(z); - bigint_monty_mul(&z[0], z.size(), + z.clear(); + + bigint_monty_mul(z.mutable_data(), z_size, x.data(), x.size(), x.sig_words(), y.data(), y.size(), y.sig_words(), m_modulus.data(), m_mod_words, m_mod_prime, &workspace[0]); - x.assign(&z[0], m_mod_words + 1); + z.mask_bits(BOTAN_MP_WORD_BITS * (m_mod_words + 1)); + x = z; } } |