diff options
Diffstat (limited to 'src/lib/math/numbertheory/powm_mnt.cpp')
| -rw-r--r-- | src/lib/math/numbertheory/powm_mnt.cpp | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/src/lib/math/numbertheory/powm_mnt.cpp b/src/lib/math/numbertheory/powm_mnt.cpp index 5da91796f..8cb3f6a08 100644 --- a/src/lib/math/numbertheory/powm_mnt.cpp +++ b/src/lib/math/numbertheory/powm_mnt.cpp @@ -10,6 +10,7 @@ #include <botan/numthry.h> #include <botan/monty.h> #include <botan/internal/monty_exp.h> +#include <botan/internal/rounding.h> namespace Botan { @@ -26,7 +27,11 @@ void Montgomery_Exponentiator::set_base(const BigInt& base) BigInt Montgomery_Exponentiator::execute() const { - return monty_execute(*m_monty, m_e); + /* + This leaks size of e via loop iterations, not possible to fix without + breaking this API. Round up to avoid leaking fine details. + */ + return monty_execute(*m_monty, m_e, round_up(m_e.bits(), 8)); } Montgomery_Exponentiator::Montgomery_Exponentiator(const BigInt& mod, |