From d589898f5be6ce8dcf3205a14892b67a3053e962 Mon Sep 17 00:00:00 2001
From: Lucas CHOLLET <lucas.chollet@free.fr>
Date: Tue, 4 Jan 2022 16:33:33 +0100
Subject: [PATCH] LibCrypto: Add SignedBigInteger::negated_value()

Return the negated value of the current number.
---
 Userland/Libraries/LibCrypto/BigInt/SignedBigInteger.cpp | 7 +++++++
 Userland/Libraries/LibCrypto/BigInt/SignedBigInteger.h   | 2 ++
 2 files changed, 9 insertions(+)

diff --git a/Userland/Libraries/LibCrypto/BigInt/SignedBigInteger.cpp b/Userland/Libraries/LibCrypto/BigInt/SignedBigInteger.cpp
index 8d35cc2b4b..6b6690faaf 100644
--- a/Userland/Libraries/LibCrypto/BigInt/SignedBigInteger.cpp
+++ b/Userland/Libraries/LibCrypto/BigInt/SignedBigInteger.cpp
@@ -292,6 +292,13 @@ FLATTEN SignedDivisionResult SignedBigInteger::divided_by(SignedBigInteger const
     };
 }
 
+FLATTEN SignedBigInteger SignedBigInteger::negated_value() const
+{
+    auto result { *this };
+    result.negate();
+    return result;
+}
+
 u32 SignedBigInteger::hash() const
 {
     return m_unsigned_data.hash() * (1 - (2 * m_sign));
diff --git a/Userland/Libraries/LibCrypto/BigInt/SignedBigInteger.h b/Userland/Libraries/LibCrypto/BigInt/SignedBigInteger.h
index df2e425ba3..d1b79df5cb 100644
--- a/Userland/Libraries/LibCrypto/BigInt/SignedBigInteger.h
+++ b/Userland/Libraries/LibCrypto/BigInt/SignedBigInteger.h
@@ -121,6 +121,8 @@ public:
     [[nodiscard]] SignedBigInteger multiplied_by(UnsignedBigInteger const& other) const;
     [[nodiscard]] SignedDivisionResult divided_by(UnsignedBigInteger const& divisor) const;
 
+    [[nodiscard]] SignedBigInteger negated_value() const;
+
     [[nodiscard]] u32 hash() const;
 
     void set_bit_inplace(size_t bit_index);