EzRand Class

Properties   Methods   Events   Config Settings   Errors  

The EzRand class can be used to generate random numbers or bytes using a variety of algorithms.

Syntax

ipworksencrypt.ezrand()

Remarks

The EzRand class can be used to generate random numbers or bytes using a variety of algorithms and implementations.

To begin first set the Algorithm property to the desired value. This property specifies the algorithm and implementation that will be used to generate the number or bytes. Possible choices include ISAAC, the Microsoft Crypto API, and platform specific random and secure random implementations.

Next set Min and Max to define the acceptable range of values when generating an integer. The Seed property may optionally be set. Then simply call GetNextInt to generate a random number. the RandInt property will be populated with the generated value.

To generate a random set of bytes set RandBytesLength to the desired number of bytes and call GetNextBytes.

Property List

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The following is the full list of the properties of the class with short descriptions. Click on the links for further details.

Method List

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The following is the full list of the methods of the class with short descriptions. Click on the links for further details.

Event List

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The following is the full list of the events fired by the class with short descriptions. Click on the links for further details.

Config Settings

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The following is a list of config settings for the class with short descriptions. Click on the links for further details.

EzRand.Algorithm Property

The random number algorithm.

Syntax

getAlgorithm(): EzrandAlgorithms;
setAlgorithm(algorithm: EzrandAlgorithms): void;

enum EzrandAlgorithms {
  raISAAC,
  raMSCryptoAPI,
  raPlatform,
  raSecurePlatform,
  raRC4Random
}

Default Value

0

Remarks

This property specifies the algorithm used to generate the random number or bytes. Possible values are:

EzRand.Max Property

The exclusive upper bound.

Syntax

getMax(): number;
setMax(max: number): void;

Default Value

100

Remarks

This property specifies the exclusive upper bound of the random integer to be generated. The value must be greater than Min. The default value is 100.

EzRand.Min Property

The inclusive lower bound.

Syntax

getMin(): number;
setMin(min: number): void;

Default Value

0

Remarks

This property specifies the inclusive lower bound of the random integer to be generated. The value must be less than Max, and must not be negative. The default value is 0.

EzRand.RandBytes Property

The random byte array.

Syntax

async getRandBytes(): Promise<Uint8Array>;

Default Value

""

Remarks

This property holds the random byte array generated by calling GetNextBytes.

This property is read-only.

EzRand.RandBytesLength Property

The length of the byte array to be generated.

Syntax

getRandBytesLength(): number;
setRandBytesLength(randBytesLength: number): void;

Default Value

16

Remarks

This property specifies the length of the random byte array to be generated. The RandBytes property will hold the byte array after GetNextBytes is called. The default value is 16.

EzRand.RandInt Property

The random integer.

Syntax

getRandInt(): number;

Default Value

0

Remarks

This property holds the random integer generated by calling GetNextInt.

This property is read-only.

EzRand.Seed Property

The seed.

Syntax

getSeed(): Uint8Array;
setSeed(seed: Uint8Array): void;

Default Value

""

Remarks

This property specifies the seed. This value is optional. If not specified and a seed is required the class will use the current time.

Seed Notes

• When Algorithm is set to 0 (raISAAC) the class uses the leftmost 256 bytes.
• When Algorithm is set to 1 (raMSCryptoAPI) the seed is ignored.
• When Algorithm is set to 2 (raPlatform) the class uses the leftmost 4 bytes.
• When Algorithm is set to 3 (raSecurePlatform) in .NET the seed is ignored. The seed is applicable in Java.

EzRand.config Method

Sets or retrieves a configuration setting.

Syntax

async ezrand.config(configurationString : string): Promise<string>

Remarks

Config is a generic method available in every class. It is used to set and retrieve configuration settings for the class.

These settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the class, access to these internal properties is provided through the Config method.

To set a configuration setting named PROPERTY, you must call Config("PROPERTY=VALUE"), where VALUE is the value of the setting expressed as a string. For boolean values, use the strings "True", "False", "0", "1", "Yes", or "No" (case does not matter).

To read (query) the value of a configuration setting, you must call Config("PROPERTY"). The value will be returned as a string.

EzRand.getNextBytes Method

Generates a sequence of random bytes.

Syntax

async ezrand.getNextBytes(): Promise<void>

Remarks

This method generates a new sequence of random bytes. The RandBytesLength property specifies the length of the byte array. After calling this method the RandBytes will hold the random bytes. The following properties are applicable when calling this method:

• Algorithm
• RandBytesLength
• Seed

EzRand.getNextInt Method

Generates a random integer.

Syntax

async ezrand.getNextInt(): Promise<void>

Remarks

This method generates a random integer. The Min and Max properties define the minimum and maximum values. After calling this method the RandInt property will hold the integer. The following properties are applicable when calling this method:

• Algorithm
• Min
• Max
• Seed

EzRand.reset Method

Resets the class.

Syntax

async ezrand.reset(): Promise<void>

Remarks

When called, the class will reset all of its properties to their default values.

EzRand.Error Event

Fired when information is available about errors during data delivery.

Syntax

ezrand.on('Error', listener: (e: {readonly errorCode: number, readonly description: string}) => void )

Remarks

The Error event is fired in case of exceptional conditions during message processing. Normally the class .

The ErrorCode parameter contains an error code, and the Description parameter contains a textual description of the error. For a list of valid error codes and their descriptions, please refer to the Error Codes section.

Config Settings (class ipworksencrypt.ezrand)

The class accepts one or more of the following configuration settings. Configuration settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the class, access to these internal properties is provided through the Config method.

EzRand Config Settings

Base Config Settings

Trappable Errors (class ipworksencrypt.ezrand)

EzRand Errors

	101   Unsupported algorithm.
	105   Invalid Min, Max, or RandomBytesLength value.