diff options
Diffstat (limited to 'mpi.cpp')
-rw-r--r-- | mpi.cpp | 31 |
1 files changed, 24 insertions, 7 deletions
@@ -55,6 +55,7 @@ Mpi::Mpi(const u_int8_t * src, u_int32_t len) { gcry_mpi_scan( &val_, GCRYMPI_FMT_STD, src, len, NULL ); } + void Mpi::operator=(const Mpi &src) { val_ = gcry_mpi_copy(src.val_); @@ -72,18 +73,27 @@ Mpi Mpi::operator+(const Mpi &b) const return res; } -Mpi Mpi::operator^(const Mpi &b) const +Mpi Mpi::operator*(const unsigned long int n) const { - u_int32_t len = 0; + Mpi res; + gcry_mpi_mul_ui(res.val_, val_, n); + return res; +} - Mpi res(gcry_mpi_get_nbits(val_)); +Mpi Mpi::operator^(const Mpi &b) const +{ + u_int32_t a_len=0, b_len=0; + Mpi res; - if(gcry_mpi_get_nbits(val_) != gcry_mpi_get_nbits(b.val_)) - throw std::length_error("mpi::operator^ const"); + a_len = gcry_mpi_get_nbits(val_); + b_len = gcry_mpi_get_nbits(b.val_); - len = gcry_mpi_get_nbits(val_); + if(a_len>=b_len) + res = Mpi(*this); + else + res = Mpi(b); - for(u_int32_t i=0; i<len; i++) { + for(u_int32_t i=0; i<a_len && i<b_len; i++) { if(gcry_mpi_test_bit(val_, i) ^ gcry_mpi_test_bit(b.val_, i)) gcry_mpi_set_bit(res.val_, i); } @@ -95,6 +105,13 @@ void Mpi::rShift(u_int8_t n) gcry_mpi_rshift(val_, val_, n); } +Mpi Mpi::mul2exp(u_int32_t e) const +{ + Mpi res; + gcry_mpi_mul_2exp( res.val_, val_, e ); + return res; +} + Buffer Mpi::getBuf() const { u_int32_t len = 0, written = 0; |