# Package org.apache.hc.client5.http.impl.auth

Standard and common HTTP authentication schemes.

See: Description

- Interface Summary
  Interface | Description
  --- | ---
  NTLMEngine | Abstract NTLM authentication engine.

- Class Summary
  Class | Description
  --- | ---
  AuthCacheKeeper | Utility class that implements commons aspects of the client side authentication cache keeping.
  AuthChallengeParser | Authentication challenge parser.
  AuthSchemeSupport |
  BasicAuthCache | Default implementation of `AuthCache`.
  BasicCredentialsProvider | Default implementation of `CredentialsStore`.
  BasicScheme | Basic authentication scheme as defined in RFC 2617.
  BasicSchemeFactory | `AuthSchemeFactory` implementation that creates and initializes `BasicScheme` instances.
  CredentialsProviderBuilder | `CredentialsProvider` builder.
  DigestScheme | Digest authentication scheme as defined in RFC 2617.
  DigestSchemeFactory | `AuthSchemeFactory` implementation that creates and initializes `DigestScheme` instances.
  GGSSchemeBase | Common behavior for `GSS` based authentication schemes.
  HttpAuthenticator | Utility class that implements commons aspects of the client side HTTP authentication.
  KerberosScheme | Kerberos authentication scheme.
  KerberosSchemeFactory | `AuthSchemeFactory` implementation that creates and initializes `KerberosScheme` instances.
  NTLMScheme | NTLM is a proprietary authentication scheme developed by Microsoft and optimized for Windows platforms.
  NTLMSchemeFactory | `AuthSchemeFactory` implementation that creates and initializes `NTLMScheme` instances configured to use the default `NTLMEngine` implementation.
  SPNegoScheme | SPNEGO (Simple and Protected GSSAPI Negotiation Mechanism) authentication scheme.
  SPNegoSchemeFactory | `AuthSchemeFactory` implementation that creates and initializes `SPNegoScheme` instances.
  SystemDefaultCredentialsProvider | Implementation of `CredentialsStore` backed by standard JRE `Authenticator`.

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

## Package org.apache.hc.client5.http.impl.auth Description

Standard and common HTTP authentication schemes.

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