Argon2 Class

Properties   Methods   Events   Config Settings   Errors  

This class implements Argon2 cryptographic hashing function designed for password hashing and protecting against various types of attacks.

Syntax

ipworksencrypt.Argon2

Remarks

Argon2 is a memory-hard algorithm that can be used for secure key derivation. It supports three different variants of the algorithm.

To create a key using this component, start by setting the required properties:

• Password
• Salt

Optionally, specify the Algorithm variant, KeyLength in bytes, number of Iterations, degree of Parallelism and MemoryCost in kilobytes.

After calling the CreateKey method, the Key will be populated with the derived key.

Note: By default, the component uses the following values which are recommended by RFC 9106: Argon2id variant with 3 iterations, 4 degrees of parallelism, 64 MB of RAM, and 32 byte key length.

Create Key Example

//Create a key using Argon2 component Argon2 argon2 = new Argon2(); argon2.Password = "password"; argon2.Salt = "AAAABBBBCCCCDDDD"; //16 bytes string argon2.UseHex = true; //hex encoded key argon2.CreateKey(); Console.WriteLine(argon2.Key); //outputs the derived key, 32 bytes by default

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.

Algorithm Property (Argon2 Class)

The variant used to derive the key.

Syntax

public int getAlgorithm();


public void setAlgorithm(int algorithm);


Enumerated values:
  public final static int aArgon2d = 0;
  public final static int aArgon2i = 1;
  public final static int aArgon2id = 2;

Default Value

2

Remarks

This property specifies which type of algorithm to use. Possible values are:

Iterations Property (Argon2 Class)

Number of iterations to perform.

Syntax

public int getIterations();


public void setIterations(int iterations);

Default Value

3

Remarks

The number of iterations is used to adjust the running time indepenently of the memory size. Valid values are from 1 to 2^(32)-1.

Key Property (Argon2 Class)

The derived key.

Syntax

public byte[] getKey();

Default Value

""

Remarks

This property holds the derived key. After calling CreateKey this property will be populated.

This property is read-only.

KeyLength Property (Argon2 Class)

The desired length of the derived key (in bytes).

Syntax

public int getKeyLength();


public void setKeyLength(int keyLength);

Default Value

32

Remarks

This property specifies the length of the key (in bytes) which will be created when CreateKey is called. Valid values are from 4 to 2^(32)-1.

MemoryCost Property (Argon2 Class)

The memory usage in kilobytes.

Syntax

public int getMemoryCost();


public void setMemoryCost(int memoryCost);

Default Value

65536

Remarks

This property defines the memory used (in kilobytes) when calling CreateKey.

Parallelism Property (Argon2 Class)

The degree of parallelism.

Syntax

public int getParallelism();


public void setParallelism(int parallelism);

Default Value

4

Remarks

This proprety specifies the number of lanes used when calling CreateKey.

Password Property (Argon2 Class)

The password from which a derived key is generated.

Syntax

public byte[] getPassword();


public void setPassword(byte[] password);

Default Value

""

Remarks

This property specifies the password from which the derived key is created.

Salt Property (Argon2 Class)

The cryptographic salt used during key creation.

Syntax

public byte[] getSalt();


public void setSalt(byte[] salt);

Default Value

""

Remarks

This proprety specifies the salt used when CreateKey is called. The salt should be a unique value and should be at least 16 bytes in length.

UseHex Property (Argon2 Class)

Whether the key is hex encoded.

Syntax

public boolean isUseHex();


public void setUseHex(boolean useHex);

Default Value

False

Remarks

This property specifies whether the created Key is hex encoded when calling CreateKey. The default value is false.

Config Method (Argon2 Class)

This method sets or retrieves a configuration setting.

Syntax

public String config(String configurationString);

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.

CreateKey Method (Argon2 Class)

Derives a key from the specified password.

Syntax

public void createKey();

Remarks

This method derives a key from the specified password using Argon2.

The following properties are applicable when calling this method:

• Password (required)
• Salt (required)
• Algorithm
• Iterations
• KeyLength
• MemoryCost
• Parallelism

This method populates the Key property with the created (derived) key.

Create Key Example

//Create a key using Argon2 component Argon2 argon2 = new Argon2(); argon2.Password = "password"; argon2.Salt = "AAAABBBBCCCCDDDD"; //16 bytes string argon2.UseHex = true; //hex encoded key argon2.CreateKey(); Console.WriteLine(argon2.Key); //outputs the derived key, 32 bytes by default

Reset Method (Argon2 Class)

Resets the class.

Syntax

public void reset();

Remarks

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

Error Event (Argon2 Class)

This event is fired for information about errors during data delivery.

Syntax

public class DefaultArgon2EventListener implements Argon2EventListener {
  ...
  public void error(Argon2ErrorEvent e) {}
  ...
}

public class Argon2ErrorEvent {
  public int errorCode;
  public String description;
}

Remarks

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

ErrorCode contains an error code and Description 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 (Argon2 Class)

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.

Argon2 Config Settings

Base Config Settings

Trappable Errors (Argon2 Class)

Argon2 Errors