# Class SecretKeyCredentialHandler

java.lang.Object
org.apache.catalina.realm.DigestCredentialHandlerBase
org.apache.catalina.realm.SecretKeyCredentialHandler

All Implemented Interfaces:
  `CredentialHandler`

public class SecretKeyCredentialHandler extends DigestCredentialHandlerBase

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `static final String`
  `DEFAULT_ALGORITHM`
  `static final int`
  `DEFAULT_ITERATIONS`
  `static final int`
  `DEFAULT_KEY_LENGTH`

  ### Fields inherited from class org.apache.catalina.realm.DigestCredentialHandlerBase

  `DEFAULT_SALT_LENGTH, sm`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `SecretKeyCredentialHandler()`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `String`
  `getAlgorithm()`
  `protected int`
  `getDefaultIterations()`
  `int`
  `getKeyLength()`
  `protected Log`
  `getLog()`
  `boolean`
  `matches(String inputCredentials, String storedCredentials)`
  Checks to see if the input credentials match the stored credentials
  `protected String`
  `mutate(String inputCredentials, byte[] salt, int iterations)`
  Generates the equivalent stored credentials for the given input credentials, salt and iterations.
  `protected String`
  `mutate(String inputCredentials, byte[] salt, int iterations, int keyLength)`
  Generates the equivalent stored credentials for the given input credentials, salt, iterations and key length.
  `void`
  `setAlgorithm(String algorithm)`
  Set the algorithm used to convert input credentials to stored credentials.
  `void`
  `setKeyLength(int keyLength)`

  ### Methods inherited from class org.apache.catalina.realm.DigestCredentialHandlerBase

  `equals, equals, getDefaultSaltLength, getIterations, getLogInvalidStoredCredentials, getSaltLength, matchesSaltIterationsEncoded, mutate, setIterations, setLogInvalidStoredCredentials, setSaltLength`

  ### Methods inherited from class java.lang.Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- ## Field Details

  - ### DEFAULT_ALGORITHM

    public static final String DEFAULT_ALGORITHM
    See Also:
      - Constant Field Values

  - ### DEFAULT_KEY_LENGTH

    public static final int DEFAULT_KEY_LENGTH
    See Also:
      - Constant Field Values

  - ### DEFAULT_ITERATIONS

    public static final int DEFAULT_ITERATIONS
    See Also:
      - Constant Field Values

- ## Constructor Details

  - ### SecretKeyCredentialHandler

    public SecretKeyCredentialHandler() throws NoSuchAlgorithmException
    Throws:
      `NoSuchAlgorithmException`

- ## Method Details

  - ### getAlgorithm

    public String getAlgorithm()
    Specified by:
      `getAlgorithm` in class `DigestCredentialHandlerBase`
    Returns:
      the algorithm used to convert input credentials to stored credentials.

  - ### setAlgorithm

    public void setAlgorithm(String algorithm) throws NoSuchAlgorithmException
    Description copied from class: `DigestCredentialHandlerBase`
    Set the algorithm used to convert input credentials to stored credentials.
    Specified by:
      `setAlgorithm` in class `DigestCredentialHandlerBase`
    Parameters:
      `algorithm` - the algorithm
    Throws:
      `NoSuchAlgorithmException` - if the specified algorithm is not supported

  - ### getKeyLength

    public int getKeyLength()

  - ### setKeyLength

    public void setKeyLength(int keyLength)

  - ### matches

    public boolean matches(String inputCredentials, String storedCredentials)
    Description copied from interface: `CredentialHandler`
    Checks to see if the input credentials match the stored credentials
    Parameters:
      `inputCredentials` - User provided credentials
      `storedCredentials` - Credentials stored in the `Realm`
    Returns:
      `true` if the inputCredentials match the storedCredentials, otherwise `false`

  - ### mutate

    protected String mutate(String inputCredentials, byte[] salt, int iterations)
    Description copied from class: `DigestCredentialHandlerBase`
    Generates the equivalent stored credentials for the given input credentials, salt and iterations. If the algorithm requires a key length, the default will be used.
    Specified by:
      `mutate` in class `DigestCredentialHandlerBase`
    Parameters:
      `inputCredentials` - User provided credentials
      `salt` - Salt, if any
      `iterations` - Number of iterations of the algorithm associated with this CredentialHandler applied to the inputCredentials to generate the equivalent stored credentials
    Returns:
      The equivalent stored credentials for the given input credentials or `null` if the generation fails

  - ### mutate

    protected String mutate(String inputCredentials, byte[] salt, int iterations, int keyLength)
    Description copied from class: `DigestCredentialHandlerBase`
    Generates the equivalent stored credentials for the given input credentials, salt, iterations and key length. The default implementation calls ignores the key length and calls `DigestCredentialHandlerBase.mutate(String, byte[], int)`. Sub-classes that use the key length should override this method.
    Overrides:
      `mutate` in class `DigestCredentialHandlerBase`
    Parameters:
      `inputCredentials` - User provided credentials
      `salt` - Salt, if any
      `iterations` - Number of iterations of the algorithm associated with this CredentialHandler applied to the inputCredentials to generate the equivalent stored credentials
      `keyLength` - Length of the produced digest in bits for implementations where it's applicable
    Returns:
      The equivalent stored credentials for the given input credentials or `null` if the generation fails

  - ### getDefaultIterations

    protected int getDefaultIterations()
    Specified by:
      `getDefaultIterations` in class `DigestCredentialHandlerBase`
    Returns:
      the default number of iterations used by the `CredentialHandler`.

  - ### getLog

    protected Log getLog()
    Specified by:
      `getLog` in class `DigestCredentialHandlerBase`
    Returns:
      the logger for the CredentialHandler instance.