QCA::BigInteger

#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
 
BigIntegeroperator%= (const BigInteger &b)
 
BigIntegeroperator*= (const BigInteger &b)
 
BigIntegeroperator+= (const BigInteger &b)
 
BigIntegeroperator-= (const BigInteger &b)
 
BigIntegeroperator/= (const BigInteger &b)
 
bool operator< (const BigInteger &other) const
 
bool operator<= (const BigInteger &other) const
 
BigIntegeroperator= (const BigInteger &from)
 
BigIntegeroperator= (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 QTextStreamoperator<< (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
nan 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
can 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
san 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
aan 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
froman 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
nthe 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
aa 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
sa 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
otherthe 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
bthe amount to divide by
BigInteger& QCA::BigInteger::operator*= ( const BigInteger b)

Multiply in place operator.

Parameters
bthe amount to multiply by
BigInteger& QCA::BigInteger::operator+= ( const BigInteger b)

Increment in place operator.

Parameters
bthe 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
bthe 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
bthe 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
otherthe 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
otherthe BigInteger to compare to

Definition at line 792 of file qca_tools.h.

BigInteger& QCA::BigInteger::operator= ( const BigInteger from)

Assignment operator.

Parameters
fromthe 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
sthe 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
otherthe 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
otherthe 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
otherthe 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
streamthe stream to write to
bthe integer to write to the stream

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