1 files changed, 181 insertions, 0 deletions
diff --git a/src/bigint/bigint.h b/src/bigint/bigint.h
new file mode 100644
index 000000000..b1286551e
--- /dev/null
+++ b/src/bigint/bigint.h
@@ -0,0 +1,181 @@
+/*************************************************
+* BigInt Header File                             *
+* (C) 1999-2008 Jack Lloyd                       *
+*************************************************/
+
+#ifndef BOTAN_BIGINT_H__
+#define BOTAN_BIGINT_H__
+
+#include <botan/rng.h>
+#include <botan/secmem.h>
+#include <botan/mp_types.h>
+#include <iosfwd>
+
+namespace Botan {
+
+/*************************************************
+* BigInt                                         *
+*************************************************/
+class BOTAN_DLL BigInt
+   {
+   public:
+      enum Base { Octal = 8, Decimal = 10, Hexadecimal = 16, Binary = 256 };
+      enum Sign { Negative = 0, Positive = 1 };
+      enum NumberType { Power2 };
+
+      struct DivideByZero : public Exception
+         { DivideByZero() : Exception("BigInt divide by zero") {} };
+
+      BigInt& operator+=(const BigInt&);
+      BigInt& operator-=(const BigInt&);
+
+      BigInt& operator*=(const BigInt&);
+      BigInt& operator/=(const BigInt&);
+      BigInt& operator%=(const BigInt&);
+      word    operator%=(word);
+      BigInt& operator<<=(u32bit);
+      BigInt& operator>>=(u32bit);
+
+      BigInt& operator++() { return (*this += 1); }
+      BigInt& operator--() { return (*this -= 1); }
+      BigInt  operator++(int) { BigInt x = (*this); ++(*this); return x; }
+      BigInt  operator--(int) { BigInt x = (*this); --(*this); return x; }
+
+      BigInt operator-() const;
+      bool operator !() const { return (!is_nonzero()); }
+
+      s32bit cmp(const BigInt&, bool = true) const;
+      bool is_even() const { return (get_bit(0) == 0); }
+      bool is_odd()  const { return (get_bit(0) == 1); }
+
+      bool is_zero() const
+         {
+         const u32bit sw = sig_words();
+
+         for(u32bit i = 0; i != sw; ++i)
+            if(reg[i])
+               return false;
+         return true;
+         }
+
+      bool is_nonzero() const { return (!is_zero()); }
+
+      void set_bit(u32bit);
+      void clear_bit(u32bit);
+      void mask_bits(u32bit);
+
+      bool get_bit(u32bit) const;
+      u32bit get_substring(u32bit, u32bit) const;
+      byte byte_at(u32bit) const;
+
+      // same as operator[], remove this
+      word word_at(u32bit n) const
+         { return ((n < size()) ? get_reg()[n] : 0); }
+
+      u32bit to_u32bit() const;
+
+      bool is_negative() const { return (sign() == Negative); }
+      bool is_positive() const { return (sign() == Positive); }
+      Sign sign() const { return (signedness); }
+      Sign reverse_sign() const;
+      void flip_sign();
+      void set_sign(Sign);
+      BigInt abs() const;
+
+      u32bit size() const { return get_reg().size(); }
+
+      u32bit sig_words() const
+         {
+         const word* x = reg.begin();
+         u32bit sig = reg.size();
+
+         while(sig && (x[sig-1] == 0))
+            sig--;
+         return sig;
+         }
+
+      u32bit bytes() const;
+      u32bit bits() const;
+
+      const word* data() const { return reg.begin(); }
+      SecureVector<word>& get_reg() { return reg; }
+      const SecureVector<word>& get_reg() const { return reg; }
+
+      void grow_reg(u32bit);
+      void grow_to(u32bit);
+
+      word& operator[](u32bit i) { return reg[i]; }
+      word operator[](u32bit i) const { return reg[i]; }
+      void clear() { get_reg().clear(); }
+
+      void randomize(RandomNumberGenerator& rng, u32bit n);
+
+      void binary_encode(byte[]) const;
+      void binary_decode(const byte[], u32bit);
+      void binary_decode(const MemoryRegion<byte>&);
+      u32bit encoded_size(Base = Binary) const;
+
+      static SecureVector<byte> encode(const BigInt&, Base = Binary);
+      static void encode(byte[], const BigInt&, Base = Binary);
+      static BigInt decode(const byte[], u32bit, Base = Binary);
+      static BigInt decode(const MemoryRegion<byte>&, Base = Binary);
+      static SecureVector<byte> encode_1363(const BigInt&, u32bit);
+
+      void swap(BigInt&);
+
+      BigInt() { signedness = Positive; }
+      BigInt(u64bit);
+      BigInt(const BigInt&);
+      BigInt(const std::string&);
+      BigInt(const byte[], u32bit, Base = Binary);
+      BigInt(RandomNumberGenerator& rng, u32bit bits);
+      BigInt(Sign, u32bit);
+      BigInt(NumberType, u32bit);
+   private:
+      SecureVector<word> reg;
+      Sign signedness;
+   };
+
+/*************************************************
+* Arithmetic Operators                           *
+*************************************************/
+BigInt BOTAN_DLL operator+(const BigInt&, const BigInt&);
+BigInt BOTAN_DLL operator-(const BigInt&, const BigInt&);
+BigInt BOTAN_DLL operator*(const BigInt&, const BigInt&);
+BigInt BOTAN_DLL operator/(const BigInt&, const BigInt&);
+BigInt BOTAN_DLL operator%(const BigInt&, const BigInt&);
+word   BOTAN_DLL operator%(const BigInt&, word);
+BigInt BOTAN_DLL operator<<(const BigInt&, u32bit);
+BigInt BOTAN_DLL operator>>(const BigInt&, u32bit);
+
+/*************************************************
+* Comparison Operators                           *
+*************************************************/
+inline bool operator==(const BigInt& a, const BigInt& b)
+   { return (a.cmp(b) == 0); }
+inline bool operator!=(const BigInt& a, const BigInt& b)
+   { return (a.cmp(b) != 0); }
+inline bool operator<=(const BigInt& a, const BigInt& b)
+   { return (a.cmp(b) <= 0); }
+inline bool operator>=(const BigInt& a, const BigInt& b)
+   { return (a.cmp(b) >= 0); }
+inline bool operator<(const BigInt& a, const BigInt& b)
+   { return (a.cmp(b) < 0); }
+inline bool operator>(const BigInt& a, const BigInt& b)
+   { return (a.cmp(b) > 0); }
+
+/*************************************************
+* I/O Operators                                  *
+*************************************************/
+BOTAN_DLL std::ostream& operator<<(std::ostream&, const BigInt&);
+BOTAN_DLL std::istream& operator>>(std::istream&, BigInt&);
+
+}
+
+namespace std {
+
+inline void swap(Botan::BigInt& a, Botan::BigInt& b) { a.swap(b); }
+
+}
+
+#endif