diff options
author | Keith Isdale <keith.isdale@nokia.com> | 2010-07-26 14:56:53 +1000 |
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committer | Keith Isdale <keith.isdale@nokia.com> | 2010-07-26 14:56:53 +1000 |
commit | 9f034793bcfc51c2b7c1dd14db806f7258f9a9eb (patch) | |
tree | 63bd0f50ce5b77828ad8205eafd7b9412810499e /botan/src/math/numbertheory/pow_mod.h | |
parent | 619d92cfef29e653bfdf852e83888e50cfc4348f (diff) | |
parent | 65271649dbc90f3af1184ad1b23bdb64c0c07d07 (diff) |
Merge branch 'master' of git://git-nokia.trolltech.com.au/qtsoftware/research/qtuitest
Diffstat (limited to 'botan/src/math/numbertheory/pow_mod.h')
-rw-r--r-- | botan/src/math/numbertheory/pow_mod.h | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/botan/src/math/numbertheory/pow_mod.h b/botan/src/math/numbertheory/pow_mod.h new file mode 100644 index 0000000..6952dcd --- /dev/null +++ b/botan/src/math/numbertheory/pow_mod.h @@ -0,0 +1,93 @@ +/* +* Modular Exponentiator +* (C) 1999-2007 Jack Lloyd +* +* Distributed under the terms of the Botan license +*/ + +#ifndef BOTAN_POWER_MOD_H__ +#define BOTAN_POWER_MOD_H__ + +#include <botan/bigint.h> + +namespace Botan { + +/* +* Modular Exponentiator Interface +*/ +class BOTAN_DLL Modular_Exponentiator + { + public: + virtual void set_base(const BigInt&) = 0; + virtual void set_exponent(const BigInt&) = 0; + virtual BigInt execute() const = 0; + virtual Modular_Exponentiator* copy() const = 0; + virtual ~Modular_Exponentiator() {} + }; + +/* +* Modular Exponentiator Proxy +*/ +class BOTAN_DLL Power_Mod + { + public: + enum Usage_Hints { + NO_HINTS = 0x0000, + + BASE_IS_FIXED = 0x0001, + BASE_IS_SMALL = 0x0002, + BASE_IS_LARGE = 0x0004, + BASE_IS_2 = 0x0008, + + EXP_IS_FIXED = 0x0100, + EXP_IS_SMALL = 0x0200, + EXP_IS_LARGE = 0x0400 + }; + + void set_modulus(const BigInt&, Usage_Hints = NO_HINTS) const; + void set_base(const BigInt&) const; + void set_exponent(const BigInt&) const; + + BigInt execute() const; + + Power_Mod& operator=(const Power_Mod&); + + Power_Mod(const BigInt& = 0, Usage_Hints = NO_HINTS); + Power_Mod(const Power_Mod&); + ~Power_Mod(); + private: + mutable Modular_Exponentiator* core; + Usage_Hints hints; + }; + +/* +* Fixed Exponent Modular Exponentiator Proxy +*/ +class BOTAN_DLL Fixed_Exponent_Power_Mod : public Power_Mod + { + public: + BigInt operator()(const BigInt& b) const + { set_base(b); return execute(); } + + Fixed_Exponent_Power_Mod() {} + Fixed_Exponent_Power_Mod(const BigInt&, const BigInt&, + Usage_Hints = NO_HINTS); + }; + +/* +* Fixed Base Modular Exponentiator Proxy +*/ +class BOTAN_DLL Fixed_Base_Power_Mod : public Power_Mod + { + public: + BigInt operator()(const BigInt& e) const + { set_exponent(e); return execute(); } + + Fixed_Base_Power_Mod() {} + Fixed_Base_Power_Mod(const BigInt&, const BigInt&, + Usage_Hints = NO_HINTS); + }; + +} + +#endif |