Multiprecision Integer Arithmetics

Programmer Reference : Cryptography : Multiprecision Integer Arithmetics

Module Implementation: OpenSSLCryptoInterfaceBN

This module is primarily a support module providing arithmetic operation on integers of arbitrary size and was designed for use in public key cryptography.

Big Number

OSSslBigNumber

Implements a number that can be arbitrarily large and has some arithmetic operations that can be performed. On the class side are some useful APIs for random number generation. It also has conversion functions to convert to/from a Smalltalk Integer.

Class methods: Creation

createNew

Create a new BIGNUM instance

Answers:

<OSSslBigNumber> - new instance

<OpenSSLError> - error object

createNewFromAsn1Integer: anAsn1Integer

Create a new BIGNUM instance from anAsn1Integer

Arguments:

anAsn1Integer - <OSSslAsn1Integer>

Answers:

<OSSslBigNumber> - new instance

<OpenSSLError> - error object

createNewFromInteger: anInteger

Create a new BIGNUM instance from anInteger <Integer>

anInteger is not bounded by any size, BIGNUM can represent arbitrarily large integers like Smalltalk

Arguments:

anInteger - <Integer>

Answers:

<OSSslBigNumber> - new instance

<OpenSSLError> - error object

Instance methods: API

clear

Destroy sensitive data such as keys when they are no longer needed. It erases the memory used by a and sets it to the value 0.

negative

Answer true if the receiver is negative, false otherwise.

Answers:

negative: aBoolean

Set the number to be negative if aBoolean is true, otherwise make it positive.

Answers:

<Boolean> - new instance

numberOfBits

Answer the number of bits used to store the number's internal representation.

Answers:

<Integer> - number of bits

numberOfBytes

Answer the number of bytes used to store the number's internal representation.

Answers:

<Integer> - number of bytes

swap: aBigNumber

Swap the values associated with myself and aBigNumber.

Arguments:

aBigNumber - <OSSslBigNumber>

Instance methods: Comparison

compare: aBigNum

Answer the comparison value (semantics described in OSSslStructure>>compare:)

Answers:

ucompare: aBigNum

Answer the UNSIGNED comparison value (semantics described in OSSslStructure>>compare:.)

Answers:

Instance methods: Conversion

asInteger

Answer a Smalltalk Integer that represents the value of the BIGNUM

Answers:

asOpenSSLAsn1Integer

Converts this ASN1_INTEGER into a BIGNUM.

Answers:

< OSSslBigNumber>

asOpenSSLBigNumber

Answer myself as a new object reference.

Answers:

asString

Converts this BIGNUM into a Smalltalk String.

Answers:

Instance methods: Duplication

duplicate

Answers a managed duplicate of this BIGNUM

Answers:

<OSSslBigNumber> - new duplicate instance

Extensions

Integer

asOpenSSLBigNumber

Answer a new OpenSSL BIGNUM with the value of this Integer

Answers:

Last modified date: 12/02/2016