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-rw-r--r--src/lib/math/bigint/bigint.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/src/lib/math/bigint/bigint.h b/src/lib/math/bigint/bigint.h
index a987fffda..387bbe8f9 100644
--- a/src/lib/math/bigint/bigint.h
+++ b/src/lib/math/bigint/bigint.h
@@ -604,6 +604,13 @@ class BOTAN_PUBLIC_API(2,0) BigInt final
size_t bits() const;
/**
+ * Get the number of high bits unset in the top (allocated) word
+ * of this integer. Returns BOTAN_MP_WORD_BITS only iff *this is
+ * zero. Ignores sign.
+ */
+ size_t top_bits_free() const;
+
+ /**
* Return a mutable pointer to the register
* @result a pointer to the start of the internal register
*/