PBKDF Class
Properties Methods Events Config Settings Errors
The PBKDF class supports using PBKDF1 and PBKDF2 to derive a key using a variety of algorithms.
Syntax
ipworksencrypt.PBKDF
Remarks
The PBKDF component implements PBKDF2 and PBKDF1 (Password-Based Key Derivation Function 1 & 2) as described in RFC 2898.
The simplest way to use the component is to simply specify the Password and Salt and call CreateKey. Before calling CreateKey additional properties such as Algorithm, KeyLength, and Iterations may be set. The component supports a variety of algorithms including HMAC-SHA1, HMAC-SHA256, HMAC-MD5, and more.
The Version property controls whether PBKDF1 or PBKDF2 (default) is used, although it is recommended to use PBKDF2.
After calling CreateKey the derived key will be held in Key.
Code Example:
Pbkdf pbkdf = new Pbkdf();
pbkdf.Password = "password";
pbkdf.Salt = "0123456789ABCDEF";
pbkdf.KeyLength = 4096;
pbkdf.CreateKey();
//Now do something with pbkdf.Key
Property List
The following is the full list of the properties of the class with short descriptions. Click on the links for further details.
Algorithm | The underlying pseudorandom function. |
Iterations | The number of iterations to perform. |
Key | The derived key. |
KeyLength | The desired length in bits of the derived key. |
Password | The password from which a derived key is generated. |
Salt | The cryptographic salt. |
UseHex | Whether the key is hex encoded. |
Version | The PBKDF version. |
Method List
The following is the full list of the methods of the class with short descriptions. Click on the links for further details.
Event List
The following is the full list of the events fired by the class with short descriptions. Click on the links for further details.
Error | Fired when information is available about errors during data delivery. |
Config Settings
The following is a list of config settings for the class with short descriptions. Click on the links for further details.
AllowEmptyPassword | Whether an empty password can be used. |
BuildInfo | Information about the product's build. |
GUIAvailable | Whether or not a message loop is available for processing events. |
LicenseInfo | Information about the current license. |
MaskSensitiveData | Whether sensitive data is masked in log messages. |
UseDaemonThreads | Whether threads created by the class are daemon threads. |
UseFIPSCompliantAPI | Tells the class whether or not to use FIPS certified APIs. |
UseInternalSecurityAPI | Whether or not to use the system security libraries or an internal implementation. |
Algorithm Property (PBKDF Class)
The underlying pseudorandom function.
Syntax
public int getAlgorithm(); public void setAlgorithm(int algorithm); Enumerated values: public final static int pbHMACSHA1 = 0; public final static int pbHMACSHA224 = 1; public final static int pbHMACSHA256 = 2; public final static int pbHMACSHA384 = 3; public final static int pbHMACSHA512 = 4; public final static int pbHMACMD5 = 5; public final static int pbHMACRIPEMD160 = 6; public final static int pbSHA1 = 7; public final static int pbMD5 = 8; public final static int pbMD2 = 9;
Default Value
0
Remarks
This property specifies the algorithm used for the pseudo random function. Possible values are:
0 (pbHMACSHA1 - default) | HMAC-SHA1, The default value and most commonly used. |
1 (pbHMACSHA224) | HMAC-SHA224 |
2 (pbHMACSHA256) | HMAC-SHA256 |
3 (pbHMACSHA384) | HMAC-SHA284 |
4 (pbHMACSHA512) | HMAC-SHA512 |
5 (pbHMACMD5) | HMAC-MD5 |
6 (pbHMACRIPEMD160) | HMAC-RIPEMD160 |
7 (pbSHA1) | SHA1, Only used with PBKDF1. |
8 (pbMD5) | MD5, Only used with PBKDF1. |
9 (pbMD2) | MD2, Only used with PBKDF1. |
Note: When using PBDKF1 the maximum KeyLength value is 160 bits for SHA1, and 128 bits for MD2 and MD5.
Iterations Property (PBKDF Class)
The number of iterations to perform.
Syntax
public int getIterations(); public void setIterations(int iterations);
Default Value
10000
Remarks
This property specifies the number of iterations to perform when deriving the key. Larger values require more time to derive a key, however they also make password cracking more difficult by increasing the amount of time required to derive each key.
The recommended minimum number of iterations is 1000, and larger values such as 10,000 are common. The default value is 10000.
Key Property (PBKDF 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 (PBKDF Class)
The desired length in bits of the derived key.
Syntax
public int getKeyLength(); public void setKeyLength(int keyLength);
Default Value
1024
Remarks
This property specifies the length in bits of the Key.
The provided value must be divisible by 8. The default value is 1024.
Note: When Version is set to PBKDF1 certain restrictions apply. When Algorithm is set to MD5 the maximum length is 128. When Algorithm is set to SHA1 the maximum value is 160.
Password Property (PBKDF 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 (PBKDF Class)
The cryptographic salt.
Syntax
public byte[] getSalt(); public void setSalt(byte[] salt);
Default Value
""
Remarks
This property specifies the salt used during key creation.
It is recommended to provide a salt value of at least 64 bits in length. A common length is 128 bits. It is also recommended that the salt value be randomly chosen.
UseHex Property (PBKDF Class)
Whether the key is hex encoded.
Syntax
public boolean isUseHex(); public void setUseHex(boolean useHex);
Default Value
False
Remarks
This setting specifies whether the created Key is hex encoded when calling CreateKey. The default value is False.
Version Property (PBKDF Class)
The PBKDF version.
Syntax
public int getVersion(); public void setVersion(int version); Enumerated values: public final static int vPBKDF1 = 0; public final static int vPBKDF2 = 1;
Default Value
1
Remarks
This property specifies the PBKDF version to be used. It is recommended to use PBKDF2 for new applications. PBKDF1 is included only for compatibility with existing applications and is not recommended.
Possible values are:
- 0 (vPBKDF1)
- 1 (vPBKDF2 - default)
Config Method (PBKDF Class)
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 (PBKDF Class)
Creates a key.
Syntax
public void createKey();
Remarks
This method creates a key using a version of the Password-Based Key Derivation Function (PBKDF).
The following properties are applicable when calling this method:
This method populates the Key property with the created (derived) key.Code Example:
Pbkdf pbkdf = new Pbkdf();
pbkdf.Password = "password";
pbkdf.Salt = "0123456789ABCDEF";
pbkdf.KeyLength = 4096;
pbkdf.CreateKey();
//Now do something with pbkdf.Key
Reset Method (PBKDF 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 (PBKDF Class)
Fired when information is available about errors during data delivery.
Syntax
public class DefaultPBKDFEventListener implements PBKDFEventListener { ... public void error(PBKDFErrorEvent e) {} ... } public class PBKDFErrorEvent { 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.
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 (PBKDF 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.PBKDF Config Settings
Pbkdf pw = new Pbkdf();
pw.Config("EncodeKey=true");
pw.Config("AllowEmptyPassword=true");
//pw.PasswordB = new byte[0];
pw.Password = "";
pw.Salt = "saltsalt";
pw.Iterations = 100;
pw.KeyLength = 160;
pw.Version = PbkdfVersions.vPBKDF2;
pw.Algorithm = PbkdfAlgorithms.pbHMACSHA1;
pw.CreateKey();
The default value is False.
Base Config Settings
In some non-GUI applications, an invalid message loop may be discovered that will result in errant behavior. In these cases, setting GUIAvailable to false will ensure that the class does not attempt to process external events.
- Product: The product the license is for.
- Product Key: The key the license was generated from.
- License Source: Where the license was found (e.g., RuntimeLicense, License File).
- License Type: The type of license installed (e.g., Royalty Free, Single Server).
- Last Valid Build: The last valid build number for which the license will work.
This setting only works on these classes: AS3Receiver, AS3Sender, Atom, Client(3DS), FTP, FTPServer, IMAP, OFTPClient, SSHClient, SCP, Server(3DS), Sexec, SFTP, SFTPServer, SSHServer, TCPClient, TCPServer.
The Java edition requires installation of the FIPS-certified Bouncy Castle library regardless of the target operating system. This can be downloaded from https://www.bouncycastle.org/fips-java/. Only the "Provider" library is needed. The jar file should then be installed in a JRE search path.
The following classes must be imported in the application in which the component will be used:
import java.security.Security;
import org.bouncycastle.jcajce.provider.BouncyCastleFipsProvider;
The Bouncy Castle provider must be added as a valid provider and must also be configured to operate in FIPS mode:
System.setProperty("org.bouncycastle.fips.approved_only","true");
Security.addProvider(new BouncyCastleFipsProvider());
When UseFIPSCompliantAPI is true, Secure Sockets Layer (SSL)-enabled classes can optionally be configured to use the Transport Layer Security (TLS) Bouncy Castle library. When SSLProvider is set to sslpAutomatic (default) or sslpInternal, an internal TLS implementation is used, but all cryptographic operations are offloaded to the Bouncy Castle FIPS provider to achieve FIPS-compliant operation. If SSLProvider is set to sslpPlatform, the Bouncy Castle JSSE will be used in place of the internal TLS implementation.
To enable the use of the Bouncy Castle JSSE take the following steps in addition to the steps above. Both the Bouncy Castle FIPS provider and the Bouncy Castle JSSE must be configured to use the Bouncy Castle TLS library in FIPS mode. Obtain the Bouncy Castle TLS library from https://www.bouncycastle.org/fips-java/. The jar file should then be installed in a JRE search path.
The following classes must be imported in the application in which the component will be used:
import java.security.Security;
import org.bouncycastle.jcajce.provider.BouncyCastleFipsProvider;
//required to use BCJSSE when SSLProvider is set to sslpPlatform
import org.bouncycastle.jsse.provider.BouncyCastleJsseProvider;
The Bouncy Castle provider must be added as a valid provider and also must be configured to operate in FIPS mode:
System.setProperty("org.bouncycastle.fips.approved_only","true");
Security.addProvider(new BouncyCastleFipsProvider());
//required to use BCJSSE when SSLProvider is set to sslpPlatform
Security.addProvider(new BouncyCastleJsseProvider("fips:BCFIPS"));
//optional - configure logging level of BCJSSE
Logger.getLogger("org.bouncycastle.jsse").setLevel(java.util.logging.Level.OFF);
//configure the class to use BCJSSE
component.setSSLProvider(1); //platform
component.config("UseFIPSCompliantAPI=true");
Note: TLS 1.3 support requires the Bouncy Castle TLS library version 1.0.14 or later.
FIPS mode can be enabled by setting the UseFIPSCompliantAPI configuration setting to true. This is a static setting that applies to all instances of all classes of the toolkit within the process. It is recommended to enable or disable this setting once before the component has been used to establish a connection. Enabling FIPS while an instance of the component is active and connected may result in unexpected behavior.
For more details, please see the FIPS 140-2 Compliance article.
Note: Enabling FIPS compliance requires a special license; please contact sales@nsoftware.com for details.
Setting this configuration setting to true tells the class to use the internal implementation instead of using the system security libraries.
This setting is set to false by default on all platforms.
Trappable Errors (PBKDF Class)
PBKDF Errors
116 | Password must be set. |
117 | An error occurred during hash calculation. |
118 | An invalid algorithm was specified. |