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-rw-r--r--src/lib/math/bigint/bigint.cpp15
1 files changed, 15 insertions, 0 deletions
diff --git a/src/lib/math/bigint/bigint.cpp b/src/lib/math/bigint/bigint.cpp
index 495907d1a..5283c893c 100644
--- a/src/lib/math/bigint/bigint.cpp
+++ b/src/lib/math/bigint/bigint.cpp
@@ -341,6 +341,21 @@ void BigInt::binary_decode(const uint8_t buf[], size_t length)
m_reg[length / WORD_BYTES] = (m_reg[length / WORD_BYTES] << 8) | buf[i];
}
+void BigInt::ct_cond_assign(bool predicate, BigInt& other)
+ {
+ const size_t t_words = size();
+ const size_t o_words = other.size();
+
+ const size_t r_words = std::max(t_words, o_words);
+
+ const word mask = CT::expand_mask<word>(predicate);
+
+ for(size_t i = 0; i != r_words; ++i)
+ {
+ this->set_word_at(i, CT::select<word>(mask, other.word_at(i), this->word_at(i)));
+ }
+ }
+
#if defined(BOTAN_HAS_VALGRIND)
void BigInt::const_time_poison() const
{