# Package org.apache.http.impl.auth

Default implementations of standard and common HTTP authentication schemes.

See: Description

Interface Summary
Interface | Description
--- | ---
NTLMEngine | Abstract NTLM authentication engine.
SpnegoTokenGenerator | Deprecated (4.2) subclass `KerberosScheme` and override `GGSSchemeBase.generateGSSToken(byte[], org.ietf.jgss.Oid, String, org.apache.http.auth.Credentials)`

Class Summary
Class | Description
--- | ---
AuthSchemeBase | Abstract authentication scheme class that serves as a basis for all authentication schemes supported by HttpClient.
BasicScheme | Basic authentication scheme as defined in RFC 2617.
BasicSchemeFactory | `AuthSchemeProvider` implementation that creates and initializes `BasicScheme` instances.
DigestScheme | Digest authentication scheme as defined in RFC 2617.
DigestSchemeFactory | `AuthSchemeProvider` implementation that creates and initializes `DigestScheme` instances.
GGSSchemeBase |
HttpAuthenticator |
KerberosScheme | KERBEROS authentication scheme.
KerberosSchemeFactory | `AuthSchemeProvider` implementation that creates and initializes `KerberosScheme` instances.
NegotiateScheme | Deprecated (4.2) use `SPNegoScheme` or `KerberosScheme`.
NegotiateSchemeFactory | Deprecated (4.2) use `SPNegoSchemeFactory` or `KerberosSchemeFactory`.
NTLMScheme | NTLM is a proprietary authentication scheme developed by Microsoft and optimized for Windows platforms.
NTLMSchemeFactory | `AuthSchemeProvider` implementation that creates and initializes `NTLMScheme` instances configured to use the default `NTLMEngine` implementation.
RFC2617Scheme | Abstract authentication scheme class that lays foundation for all RFC 2617 compliant authentication schemes and provides capabilities common to all authentication schemes defined in RFC 2617.
SPNegoScheme | SPNEGO (Simple and Protected GSSAPI Negotiation Mechanism) authentication scheme.
SPNegoSchemeFactory | `AuthSchemeProvider` implementation that creates and initializes `SPNegoScheme` instances.

Exception Summary
Exception | Description
--- | ---
NTLMEngineException | Signals NTLM protocol failure.
UnsupportedDigestAlgorithmException | Authentication credentials required to respond to a authentication challenge are invalid

## Package org.apache.http.impl.auth Description

Default implementations of standard and common HTTP authentication schemes.