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Viewing changes to modules/eng_ossl/bn_powm.cpp

  • Committer: Package Import Robot
  • Author(s): Laszlo Boszormenyi (GCS)
  • Date: 2018-03-01 22:23:25 UTC
  • mfrom: (1.2.2)
  • Revision ID: package-import@ubuntu.com-20180301222325-7p7vc45gu3hta34d
Tags: 2.4.0-2
* Don't remove .doctrees from the manual if it doesn't exist.
* Don't specify parallel to debhelper.

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modules/eng_ossl/bn_powm.cpp
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/*************************************************
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* OpenSSL Modular Exponentiation Source File     *
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* (C) 1999-2007 The Botan Project                *
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*************************************************/
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#include <botan/eng_ossl.h>
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#include <botan/bn_wrap.h>
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namespace Botan {
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namespace {
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/*************************************************
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* OpenSSL Modular Exponentiator                  *
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*************************************************/
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class OpenSSL_Modular_Exponentiator : public Modular_Exponentiator
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   {
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   public:
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      void set_base(const BigInt& b) { base = b; }
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      void set_exponent(const BigInt& e) { exp = e; }
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      BigInt execute() const;
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      Modular_Exponentiator* copy() const
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         { return new OpenSSL_Modular_Exponentiator(*this); }
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      OpenSSL_Modular_Exponentiator(const BigInt& n) : mod(n) {}
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   private:
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      OSSL_BN base, exp, mod;
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      OSSL_BN_CTX ctx;
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   };
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/*************************************************
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* Compute the result                             *
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*************************************************/
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BigInt OpenSSL_Modular_Exponentiator::execute() const
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   {
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   OSSL_BN r;
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   BN_mod_exp(r.value, base.value, exp.value, mod.value, ctx.value);
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   return r.to_bigint();
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   }
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}
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/*************************************************
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* Return the OpenSSL-based modular exponentiator *
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*************************************************/
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Modular_Exponentiator* OpenSSL_Engine::mod_exp(const BigInt& n,
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                                           Power_Mod::Usage_Hints) const
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   {
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   return new OpenSSL_Modular_Exponentiator(n);
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   }
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}