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LibCrypto: Add UnsignedBigInteger division

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The division operation returns both the quotient and the remainder.
This commit is contained in:
Itamar 2020-04-09 12:52:25 +03:00 • committed by Andreas Kling
parent 2959c4a5e9
commit 0d2777752e
3 changed files with 113 additions and 6 deletions
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14
Libraries/LibCrypto/BigInt/UnsignedBigInteger.h
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@ -30,6 +30,9 @@
#include <AK/Vector.h>
namespace Crypto {
struct UnsignedDivisionResult;
class UnsignedBigInteger {
public:
UnsignedBigInteger(u32 x) { m_words.append(x); }
@ -49,7 +52,10 @@ public:
UnsignedBigInteger sub(const UnsignedBigInteger& other) const;
UnsignedBigInteger multiply(const UnsignedBigInteger& other) const;
UnsignedBigInteger shift_left(size_t num_bits) const;
UnsignedBigInteger shift_left_by_n_words(const size_t number_of_words) const;
UnsignedDivisionResult divide(const UnsignedBigInteger& divisor) const;
void set_bit_inplace(size_t bit_index);
size_t length() const { return m_words.size(); }
@ -63,6 +69,7 @@ public:
bool is_invalid() const { return m_is_invalid; }
private:
UnsignedBigInteger shift_left_by_n_words(const size_t number_of_words) const;
u32 shift_left_get_one_word(const size_t num_bits, const size_t result_word_index) const;
static constexpr size_t BITS_IN_WORD = 32;
@ -72,6 +79,11 @@ private:
bool m_is_invalid { false };
};
struct UnsignedDivisionResult {
Crypto::UnsignedBigInteger quotient;
Crypto::UnsignedBigInteger remainder;
};
}
inline const LogStream& operator<<(const LogStream& stream, const Crypto::UnsignedBigInteger value)