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diff --git a/src/libs/3rdparty/botan/src/lib/pubkey/blinding.h b/src/libs/3rdparty/botan/src/lib/pubkey/blinding.h
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index 0000000000..1bdd235f0f
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+++ b/src/libs/3rdparty/botan/src/lib/pubkey/blinding.h
@@ -0,0 +1,78 @@
+/*
+* Blinding for public key operations
+* (C) 1999-2010,2015 Jack Lloyd
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#ifndef BOTAN_BLINDER_H_
+#define BOTAN_BLINDER_H_
+
+#include <botan/bigint.h>
+#include <botan/reducer.h>
+#include <functional>
+
+namespace Botan {
+
+class RandomNumberGenerator;
+
+/**
+* Blinding Function Object.
+*/
+class BOTAN_PUBLIC_API(2,0) Blinder final
+   {
+   public:
+      /**
+      * Blind a value.
+      * The blinding nonce k is freshly generated after
+      * BOTAN_BLINDING_REINIT_INTERVAL calls to blind().
+      * BOTAN_BLINDING_REINIT_INTERVAL = 0 means a fresh
+      * nonce is only generated once. On every other call,
+      * an updated nonce is used for blinding: k' = k*k mod n.
+      * @param x value to blind
+      * @return blinded value
+      */
+      BigInt blind(const BigInt& x) const;
+
+      /**
+      * Unblind a value.
+      * @param x value to unblind
+      * @return unblinded value
+      */
+      BigInt unblind(const BigInt& x) const;
+
+      /**
+      * @param modulus the modulus
+      * @param rng the RNG to use for generating the nonce
+      * @param fwd_func a function that calculates the modular
+      * exponentiation of the public exponent and the given value (the nonce)
+      * @param inv_func a function that calculates the modular inverse
+      * of the given value (the nonce)
+      */
+      Blinder(const BigInt& modulus,
+              RandomNumberGenerator& rng,
+              std::function<BigInt (const BigInt&)> fwd_func,
+              std::function<BigInt (const BigInt&)> inv_func);
+
+      Blinder(const Blinder&) = delete;
+
+      Blinder& operator=(const Blinder&) = delete;
+
+      RandomNumberGenerator& rng() const { return m_rng; }
+
+   private:
+      BigInt blinding_nonce() const;
+
+      Modular_Reducer m_reducer;
+      RandomNumberGenerator& m_rng;
+      std::function<BigInt (const BigInt&)> m_fwd_fn;
+      std::function<BigInt (const BigInt&)> m_inv_fn;
+      size_t m_modulus_bits = 0;
+
+      mutable BigInt m_e, m_d;
+      mutable size_t m_counter = 0;
+   };
+
+}
+
+#endif