QCA::BigInteger Class Reference

#include <QtCrypto>

Public Member Functions
	BigInteger ()
	BigInteger (int n)
	BigInteger (const char *c)
	BigInteger (const QString &s)
	BigInteger (const QCA::SecureArray &a)
	BigInteger (const BigInteger &from)
int	compare (const BigInteger &n) const
void	fromArray (const QCA::SecureArray &a)
bool	fromString (const QString &s)
bool	operator!= (const BigInteger &other) const
BigInteger &	operator%= (const BigInteger &b)
BigInteger &	operator*= (const BigInteger &b)
BigInteger &	operator+= (const BigInteger &b)
BigInteger &	operator-= (const BigInteger &b)
BigInteger &	operator/= (const BigInteger &b)
bool	operator< (const BigInteger &other) const
bool	operator<= (const BigInteger &other) const
BigInteger &	operator= (const BigInteger &from)
BigInteger &	operator= (const QString &s)
bool	operator== (const BigInteger &other) const
bool	operator> (const BigInteger &other) const
bool	operator>= (const BigInteger &other) const
QCA::SecureArray	toArray () const
QString	toString () const

Related Functions
(Note that these are not member functions.)
QCA_EXPORT QTextStream &	operator<< (QTextStream &stream, const BigInteger &b)

Detailed Description

Arbitrary precision integer.

BigInteger provides arbitrary precision integers.

if ( BigInteger("3499543804349") ==
    BigInteger("38493290803248") + BigInteger( 343 ) )
{
    // do something
}

Definition at line 570 of file qca_tools.h.

Constructor & Destructor Documentation

QCA::BigInteger::BigInteger

(

)

Constructor.

Creates a new BigInteger, initialised to zero.

QCA::BigInteger::BigInteger

(

int

n

)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Parameters

n	an alternative integer initialisation value.

QCA::BigInteger::BigInteger

(

const char *

c

)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Parameters

c	an alternative initialisation value, encoded as a character array

BigInteger b ( "9890343" );

QCA::BigInteger::BigInteger

(

const QString &

s

)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Parameters

s	an alternative initialisation value, encoded as a string

QCA::BigInteger::BigInteger

(

const QCA::SecureArray &

a

)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Parameters

a	an alternative initialisation value, encoded as SecureArray

QCA::BigInteger::BigInteger

(

const BigInteger &

from

)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Parameters

from	an alternative initialisation value, encoded as a BigInteger

Member Function Documentation

int QCA::BigInteger::compare

(

const BigInteger &

n

)

const

Compare this value with another BigInteger.

Normally it is more readable to use one of the operator overloads, so you don't need to use this method directly.

Parameters

n	the BigInteger to compare with

Returns

zero if the values are the same, negative if the argument is less than the value of this BigInteger, and positive if the argument value is greater than this BigInteger

BigInteger a( "400" );
BigInteger b( "-400" );
BigInteger c( " 200 " );
int result;
result = a.compare( b );        // return positive 400 > -400
result = a.compare( c );        // return positive,  400 > 200
result = b.compare( c );        // return negative, -400 < 200

void QCA::BigInteger::fromArray

(

const QCA::SecureArray &

a

)

Assign from an array.

The input is expected to be a binary integer in sign-extended network-byte-order.

Parameters

a	a SecureArray that represents an integer

See also

BigInteger(const SecureArray &a);

SecureArray toArray() const;

bool QCA::BigInteger::fromString

(

const QString &

s

)

Assign from a QString.

Parameters

s	a QString that represents an integer

Note

it is the application's responsibility to make sure that the QString represents a valid integer (ie it only contains numbers and an optional minus sign at the start)

See also

BigInteger(const QString &s)

BigInteger & operator=(const QString &s)

bool QCA::BigInteger::operator!= ( const BigInteger &  other ) const

inline

Inequality operator.

Returns true if the two BigInteger values are different in magnitude, sign or both.

Parameters

other

the BigInteger to compare to

Definition at line 780 of file qca_tools.h.

BigInteger& QCA::BigInteger::operator%=

(

const BigInteger &

b

)

Modulo in place operator.

Parameters

b	the amount to divide by

BigInteger& QCA::BigInteger::operator*=

(

const BigInteger &

b

)

Multiply in place operator.

Parameters

b	the amount to multiply by

BigInteger& QCA::BigInteger::operator+=

(

const BigInteger &

b

)

Increment in place operator.

Parameters

b	the amount to increment by

BigInteger a; // a is zero
BigInteger b( 500 );
a += b; // a is now 500
a += b; // a is now 1000

BigInteger& QCA::BigInteger::operator-=

(

const BigInteger &

b

)

Decrement in place operator.

Parameters

b	the amount to decrement by

BigInteger a; // a is zero
BigInteger b( 500 );
a -= b; // a is now -500
a -= b; // a is now -1000

BigInteger& QCA::BigInteger::operator/=

(

const BigInteger &

b

)

Divide in place operator.

Parameters

b	the amount to divide by

bool QCA::BigInteger::operator< ( const BigInteger &  other ) const

inline

Less than operator.

Returns true if the BigInteger value on the left hand side is less than the BigInteger value on the right hand side.

Parameters

other

the BigInteger to compare to

Definition at line 816 of file qca_tools.h.

bool QCA::BigInteger::operator<= ( const BigInteger &  other ) const

inline

Less than or equal operator.

Returns true if the BigInteger value on the left hand side is equal to or less than the BigInteger value on the right hand side.

Parameters

other

the BigInteger to compare to

Definition at line 792 of file qca_tools.h.

BigInteger& QCA::BigInteger::operator=

(

const BigInteger &

from

)

Assignment operator.

Parameters

from	the BigInteger to copy from

BigInteger a; // a is zero
BigInteger b( 500 );
a = b; // a is now 500

BigInteger& QCA::BigInteger::operator=

(

const QString &

s

)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Parameters

s	the QString containing an integer representation

See also

bool fromString(const QString &s)

Note

it is the application's responsibility to make sure that the QString represents a valid integer (ie it only contains numbers and an optional minus sign at the start)

bool QCA::BigInteger::operator== ( const BigInteger &  other ) const

inline

Equality operator.

Returns true if the two BigInteger values are the same, including having the same sign.

Parameters

other

the BigInteger to compare to

Definition at line 769 of file qca_tools.h.

bool QCA::BigInteger::operator> ( const BigInteger &  other ) const

inline

Greater than operator.

Returns true if the BigInteger value on the left hand side is greater than the BigInteger value on the right hand side.

Parameters

other

the BigInteger to compare to

Definition at line 828 of file qca_tools.h.

bool QCA::BigInteger::operator>= ( const BigInteger &  other ) const

inline

Greater than or equal operator.

Returns true if the BigInteger value on the left hand side is equal to or greater than the BigInteger value on the right hand side.

Parameters

other

the BigInteger to compare to

Definition at line 804 of file qca_tools.h.

QCA::SecureArray QCA::BigInteger::toArray

(

)

const

Output BigInteger as a byte array, useful for storage or transmission.

The format is a binary integer in sign-extended network-byte-order.

See also

void fromArray(const SecureArray &a);

QString QCA::BigInteger::toString

(

)

const

Convert BigInteger to a QString.

QString aString;
BigInteger aBiggishInteger( 5878990 );
aString = aBiggishInteger.toString(); // aString is now "5878990"

Examples:

certtest.cpp.

Friends And Related Function Documentation

QCA_EXPORT QTextStream & operator<< ( QTextStream &  stream, const BigInteger &  b  )

related

Stream operator.

Parameters

stream	the stream to write to
b	the integer to write to the stream

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The documentation for this class was generated from the following file:

• qca_tools.h