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## org.apache.commons.httpclient.auth
Class DigestScheme

    java.lang.Object
      org.apache.commons.httpclient.auth.RFC2617Scheme
          org.apache.commons.httpclient.auth.DigestScheme

All Implemented Interfaces:
  AuthScheme

    public class DigestScheme

extends RFC2617Scheme

Digest authentication scheme as defined in RFC 2617. Both MD5 (default) and MD5-sess are supported. Currently only qop=auth or no qop is supported. qop=auth-int is unsupported. If auth and auth-int are provided, auth is used.

Credential charset is configured via the `credential charset` parameter. Since the digest username is included as clear text in the generated Authentication header, the charset of the username must be compatible with the `http element charset`.

TODO: make class more stateful regarding repeated authentication requests

Author:
  Remy Maucherat, Rodney Waldhoff, Jeff Dever, Ortwin Gl?ck, Sean C. Sullivan, Adrian Sutton, Mike Bowler, Oleg Kalnichevski

Constructor Summary
`DigestScheme()` Default constructor for the digest authetication scheme.
`DigestScheme(String challenge)` Deprecated. Use parameterless constructor and `AuthScheme.processChallenge(String)` method

Method Summary
`String` | `authenticate(Credentials credentials, HttpMethod method)` Produces a digest authorization string for the given set of `Credentials`, method name and URI.
`String` | `authenticate(Credentials credentials, String method, String uri)` Deprecated. Use `authenticate(Credentials, HttpMethod)`
`static String` | `createCnonce()` Creates a random cnonce value based on the current time.
`String` | `getID()` Deprecated. no longer used
`String` | `getSchemeName()` Returns textual designation of the digest authentication scheme.
`boolean` | `isComplete()` Tests if the Digest authentication process has been completed.
`boolean` | `isConnectionBased()` Returns `false`.
`void` | `processChallenge(String challenge)` Processes the Digest challenge.

Methods inherited from class org.apache.commons.httpclient.auth.RFC2617Scheme
`getParameter, getParameters, getRealm`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### DigestScheme

    public DigestScheme()

  Default constructor for the digest authetication scheme.

  Since:
    3.0

### DigestScheme

    public DigestScheme(String challenge)
                 throws MalformedChallengeException

  Deprecated. Use parameterless constructor and `AuthScheme.processChallenge(String)` method

  Constructor for the digest authetication scheme.

  Parameters:
    `challenge` - authentication challenge
  Throws:
    `MalformedChallengeException` - is thrown if the authentication challenge is malformed

Method Detail

### getID

    public String getID()

  Deprecated. no longer used

  Gets an ID based upon the realm and the nonce value. This ensures that requests to the same realm with different nonce values will succeed. This differentiation allows servers to request re-authentication using a fresh nonce value.

  Specified by:
    `getID` in interface `AuthScheme`
  Overrides:
    `getID` in class `RFC2617Scheme`
  Returns:
    String a String identifying the authentication challenge. The returned value may be null.

### processChallenge

    public void processChallenge(String challenge)
                          throws MalformedChallengeException

  Processes the Digest challenge.

  Specified by:
    `processChallenge` in interface `AuthScheme`
  Overrides:
    `processChallenge` in class `RFC2617Scheme`
  Parameters:
    `challenge` - the challenge string
  Throws:
    `MalformedChallengeException` - is thrown if the authentication challenge is malformed
  Since:
    3.0

### isComplete

    public boolean isComplete()

  Tests if the Digest authentication process has been completed.

  Returns:
    `true` if Digest authorization has been processed, `false` otherwise.
  Since:
    3.0

### getSchemeName

    public String getSchemeName()

  Returns textual designation of the digest authentication scheme.

  Returns:
    `digest`

### isConnectionBased

    public boolean isConnectionBased()

  Returns `false`. Digest authentication scheme is request based.

  Returns:
    `false`.
  Since:
    3.0

### authenticate

    public String authenticate(Credentials credentials,
                               String method,
                               String uri)
                        throws AuthenticationException

  Deprecated. Use `authenticate(Credentials, HttpMethod)`

  Produces a digest authorization string for the given set of `Credentials`, method name and URI.

  Parameters:
    `credentials` - A set of credentials to be used for athentication
    `method` - the name of the method that requires authorization.
    `uri` - The URI for which authorization is needed.
  Returns:
    a digest authorization string
  Throws:
    `InvalidCredentialsException` - if authentication credentials are not valid or not applicable for this authentication scheme
    `AuthenticationException` - if authorization string cannot be generated due to an authentication failure
  See Also:
    `HttpMethod.getName()`, `HttpMethod.getPath()`

### authenticate

    public String authenticate(Credentials credentials,
                               HttpMethod method)
                        throws AuthenticationException

  Produces a digest authorization string for the given set of `Credentials`, method name and URI.

  Parameters:
    `credentials` - A set of credentials to be used for athentication
    `method` - The method being authenticated
  Returns:
    a digest authorization string
  Throws:
    `InvalidCredentialsException` - if authentication credentials are not valid or not applicable for this authentication scheme
    `AuthenticationException` - if authorization string cannot be generated due to an authentication failure
  Since:
    3.0

### createCnonce

    public static String createCnonce()

  Creates a random cnonce value based on the current time.

  Returns:
    The cnonce value as String.
  Throws:
    `HttpClientError` - if MD5 algorithm is not supported.

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