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## java.security.cert
Class PKIXParameters

    java.lang.Object
      |
      +--java.security.cert.PKIXParameters

All Implemented Interfaces:
  CertPathParameters, java.lang.Cloneable

Direct Known Subclasses:
  PKIXBuilderParameters

public class PKIXParameters
extends java.lang.Object
implements CertPathParameters

Parameters used as input for the PKIX CertPathValidator algorithm.
A PKIX `CertPathValidator` uses these parameters to validate a `CertPath` according to the PKIX certification path validation algorithm.
To instantiate a `PKIXParameters` object, an application must specify one or more most-trusted CAs as defined by the PKIX certification path validation algorithm. The most-trusted CAs can be specified using one of two constructors. An application can call `PKIXParameters(Set)`, specifying a Set of `TrustAnchor` objects, each of which identify a most-trusted CA. Alternatively, an application can call `PKIXParameters(KeyStore)`, specifying a `KeyStore` instance containing trusted certificate entries, each of which will be considered as a most-trusted CA.
Once a `PKIXParameters` object has been created, other parameters can be specified (by calling `setInitialPolicies(java.util.Set)` or `setDate(java.util.Date)`, for instance) and then the `PKIXParameters` is passed along with the `CertPath` to be validated to `CertPathValidator.validate(java.security.cert.CertPath, java.security.cert.CertPathParameters)`.
Any parameter that is not set (or is set to null) will be set to the default value for that parameter. The default value for the date parameter is null, which indicates the current time when the path is validated. The default for the remaining parameters is the least constrained.
Concurrent Access
Unless otherwise specified, the methods defined in this class are not thread-safe. Multiple threads that need to access a single object concurrently should synchronize amongst themselves and provide the necessary locking. Multiple threads each manipulating separate objects need not synchronize.

See Also:
  `CertPathValidator`

Constructor Summary
`PKIXParameters(KeyStore keystore)` Creates an instance of PKIXParameters that populates the set of most-trusted CAs from the trusted certificate entries contained in the specified KeyStore.
`PKIXParameters(Set trustAnchors)` Creates an instance of PKIXParameters with the specified Set of most-trusted CAs.

Method Summary
`void` | `addCertPathChecker(PKIXCertPathChecker checker)` Adds a PKIXCertPathChecker to the list of certification path checkers.
`void` | `addCertStore(CertStore store)` Adds a CertStore to the end of the list of CertStores used in finding certificates and CRLs.
`java.lang.Object` | `clone()` Makes a copy of this PKIXParameters object.
`List` | `getCertPathCheckers()` Returns the List of certification path checkers.
`List` | `getCertStores()` Returns an immutable List of CertStores that are used to find certificates and CRLs.
`java.util.Date` | `getDate()` Returns the time for which the validity of the certification path should be determined.
`Set` | `getInitialPolicies()` Returns an immutable Set of initial policy identifiers (OID strings), indicating that any one of these policies would be acceptable to the certificate user for the purposes of certification path processing.
`boolean` | `getPolicyQualifiersRejected()` Gets the PolicyQualifiersRejected flag.
`java.lang.String` | `getSigProvider()` Returns the signature provider's name, or `null` if not set.
`CertSelector` | `getTargetCertConstraints()` Returns the required constraints on the target certificate.
`Set` | `getTrustAnchors()` Returns an immutable Set of the most-trusted CAs.
`boolean` | `isAnyPolicyInhibited()` Checks whether the any policy OID should be processed if it is included in a certificate.
`boolean` | `isExplicitPolicyRequired()` Checks if explicit policy is required.
`boolean` | `isPolicyMappingInhibited()` Checks if policy mapping is inhibited.
`boolean` | `isRevocationEnabled()` Checks the RevocationEnabled flag.
`void` | `setAnyPolicyInhibited(boolean val)` Sets state to determine if the any policy OID should be processed if it is included in a certificate.
`void` | `setCertPathCheckers(List checkers)` Sets a `List` of additional certification path checkers.
`void` | `setCertStores(List stores)` Sets the list of CertStores to be used in finding certificates and CRLs.
`void` | `setDate(java.util.Date date)` Sets the time for which the validity of the certification path should be determined.
`void` | `setExplicitPolicyRequired(boolean val)` Sets the ExplicitPolicyRequired flag.
`void` | `setInitialPolicies(Set initialPolicies)` Sets the `Set` of initial policy identifiers (OID strings), indicating that any one of these policies would be acceptable to the certificate user for the purposes of certification path processing.
`void` | `setPolicyMappingInhibited(boolean val)` Sets the PolicyMappingInhibited flag.
`void` | `setPolicyQualifiersRejected(boolean qualifiersRejected)` Sets the PolicyQualifiersRejected flag.
`void` | `setRevocationEnabled(boolean val)` Sets the RevocationEnabled flag.
`void` | `setSigProvider(java.lang.String sigProvider)` Sets the signature provider's name.
`void` | `setTargetCertConstraints(CertSelector selector)` Sets the required constraints on the target certificate.
`void` | `setTrustAnchors(Set trustAnchors)` Sets the Set of most-trusted CAs. Note that the Set is copied to protect against subsequent modifications.
`java.lang.String` | `toString()` Returns a formatted string describing the parameters.

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

Constructor Detail

### PKIXParameters

    public PKIXParameters(Set trustAnchors)
                   throws InvalidAlgorithmParameterException

  Creates an instance of PKIXParameters with the specified Set of most-trusted CAs. Each element of the set is a TrustAnchor.
  Note that the Set is copied to protect against subsequent modifications.

Parameters:
  `trustAnchors` - a Set of TrustAnchors
Throws:
  `InvalidAlgorithmParameterException` - if the specified Set is empty `(trustAnchors.isEmpty() == true)`
  `java.lang.NullPointerException` - if the specified Set is `null`
  `java.lang.ClassCastException` - if any of the elements in the Set are not of type `java.security.cert.TrustAnchor`

### PKIXParameters

    public PKIXParameters(KeyStore keystore)
                   throws KeyStoreException,
                          InvalidAlgorithmParameterException

  Creates an instance of PKIXParameters that populates the set of most-trusted CAs from the trusted certificate entries contained in the specified KeyStore. Only keystore entries that contain trusted X509Certificates are considered; all other certificate types are ignored.

Parameters:
  `keystore` - a KeyStore from which the set of most-trusted CAs will be populated
Throws:
  `KeyStoreException` - if the keystore has not been initialized
  `InvalidAlgorithmParameterException` - if the keystore does not contain at least one trusted certificate entry
  `java.lang.NullPointerException` - if the keystore is null

Method Detail

### getTrustAnchors

    public Set getTrustAnchors()

  Returns an immutable Set of the most-trusted CAs.

  Returns:
    an immutable `Set` of `TrustAnchors` (never `null`)
  See Also:
    `setTrustAnchors(java.util.Set)`

### setTrustAnchors

    public void setTrustAnchors(Set trustAnchors)
                         throws InvalidAlgorithmParameterException

  Sets the Set of most-trusted CAs.
  Note that the Set is copied to protect against subsequent modifications.

  Parameters:
    `trustAnchors` - a Set of TrustAnchors
  Throws:
    `InvalidAlgorithmParameterException` - if the specified Set is empty `(trustAnchors.isEmpty() == true)`
    `java.lang.NullPointerException` - if the specified Set is `null`
    `java.lang.ClassCastException` - if any of the elements in the set are not of type java.security.cert.TrustAnchor
  See Also:
    `getTrustAnchors()`

### getInitialPolicies

    public Set getInitialPolicies()

  Returns an immutable Set of initial policy identifiers (OID strings), indicating that any one of these policies would be acceptable to the certificate user for the purposes of certification path processing. The default return value is an empty `Set`, which is interpreted as meaning that any policy would be acceptable.

  Returns:
    an immutable `Set` of initial policy OIDs in String format, or an empty `Set` (implying any policy is acceptable). Never returns `null`.
  See Also:
    `setInitialPolicies(java.util.Set)`

### setInitialPolicies

    public void setInitialPolicies(Set initialPolicies)

  Sets the `Set` of initial policy identifiers (OID strings), indicating that any one of these policies would be acceptable to the certificate user for the purposes of certification path processing. By default, any policy is acceptable (i.e. all policies), so a user that wants to allow any policy as acceptable does not need to call this method, or can call it with an empty `Set` (or `null`).
  Note that the Set is copied to protect against subsequent modifications.

  Parameters:
    `initialPolicies` - a Set of initial policy OIDs in String format (or `null`)
  Throws:
    `java.lang.ClassCastException` - if any of the elements in the set are not of type String
  See Also:
    `getInitialPolicies()`

### setCertStores

    public void setCertStores(List stores)

  Sets the list of CertStores to be used in finding certificates and CRLs. May be null, in which case no CertStores will be used. The first CertStores in the list may be preferred to those that appear later.
  Note that the List is copied to protect against subsequent modifications.

  Parameters:
    `stores` - a List of CertStores (or `null`)
  Throws:
    `java.lang.ClassCastException` - if any of the elements in the list are not of type `java.security.cert.CertStore`
  See Also:
    `getCertStores()`

### addCertStore

    public void addCertStore(CertStore store)

  Adds a CertStore to the end of the list of CertStores used in finding certificates and CRLs.

  Parameters:
    `store` - the `CertStore` to add. If `null`

  ### getCertStores

      public List getCertStores()

    Returns an immutable List of CertStores that are used to find certificates and CRLs.

    Returns:
      an immutable List of CertStores (may be empty, but never `null`)
    See Also:
      `setCertStores(java.util.List)`

  ### setRevocationEnabled

      public void setRevocationEnabled(boolean val)

    Sets the RevocationEnabled flag. If this flag is true, the default revocation checking mechanism of the underlying PKIX service provider will be used. If this flag is false, the default revocation checking mechanism will be disabled (not used).
    When a `PKIXParameters` object is created, this flag is set to true. This setting reflects the most common strategy for checking revocation, since each service provider must support revocation checking to be PKIX compliant. Sophisticated applications should set this flag to false when it is not practical to use a PKIX service provider's default revocation checking mechanism or when an alternative revocation checking mechanism is to be substituted (by also calling the `addCertPathChecker` or `setCertPathCheckers` methods).

    Parameters:
      `val` - the new value of the RevocationEnabled flag

  ### isRevocationEnabled

      public boolean isRevocationEnabled()

    Checks the RevocationEnabled flag. If this flag is true, the default revocation checking mechanism of the underlying PKIX service provider will be used. If this flag is false, the default revocation checking mechanism will be disabled (not used). See the setRevocationEnabled method for more details on setting the value of this flag.

    Returns:
      the current value of the RevocationEnabled flag

  ### setExplicitPolicyRequired

      public void setExplicitPolicyRequired(boolean val)

    Sets the ExplicitPolicyRequired flag. If this flag is true, an acceptable policy needs to be explicitly identified in every certificate. By default, the ExplicitPolicyRequired flag is false.

    Parameters:
      `val` - true if explicit policy is to be required, false otherwise

  ### isExplicitPolicyRequired

      public boolean isExplicitPolicyRequired()

    Checks if explicit policy is required. If this flag is true, an acceptable policy needs to be explicitly identified in every certificate. By default, the ExplicitPolicyRequired flag is false.

    Returns:
      true if explicit policy is required, false otherwise

  ### setPolicyMappingInhibited

      public void setPolicyMappingInhibited(boolean val)

    Sets the PolicyMappingInhibited flag. If this flag is true, policy mapping is inhibited. By default, policy mapping is not inhibited (the flag is false).

    Parameters:
      `val` - true if policy mapping is to be inhibited, false otherwise

  ### isPolicyMappingInhibited

      public boolean isPolicyMappingInhibited()

    Checks if policy mapping is inhibited. If this flag is true, policy mapping is inhibited. By default, policy mapping is not inhibited (the flag is false).

    Returns:
      true if policy mapping is inhibited, false otherwise

  ### setAnyPolicyInhibited

      public void setAnyPolicyInhibited(boolean val)

    Sets state to determine if the any policy OID should be processed if it is included in a certificate. By default, the any policy OID is not inhibited (`isAnyPolicyInhibited()` returns false).

    Returns:
      val - `true` if the any policy OID is to be inhibited, `false` otherwise

  ### isAnyPolicyInhibited

      public boolean isAnyPolicyInhibited()

    Checks whether the any policy OID should be processed if it is included in a certificate.

    Returns:
      `true` if the any policy OID is inhibited, `false` otherwise

  ### setPolicyQualifiersRejected

      public void setPolicyQualifiersRejected(boolean qualifiersRejected)

    Sets the PolicyQualifiersRejected flag. If this flag is true, certificates that include policy qualifiers in a certificate policies extension that is marked critical are rejected. If the flag is false, certificates are not rejected on this basis.
    When a `PKIXParameters` object is created, this flag is set to true. This setting reflects the most common (and simplest) strategy for processing policy qualifiers. Applications that want to use a more sophisticated policy must set this flag to false.
    Note that the PKIX certification path validation algorithm specifies that any policy qualifier in a certificate policies extension that is marked critical must be processed and validated. Otherwise the certification path must be rejected. If the policyQualifiersRejected flag is set to false, it is up to the application to validate all policy qualifiers in this manner in order to be PKIX compliant.

    Parameters:
      `qualifiersRejected` - the new value of the PolicyQualifiersRejected flag
    See Also:
      `getPolicyQualifiersRejected()`, `PolicyQualifierInfo`

  ### getPolicyQualifiersRejected

      public boolean getPolicyQualifiersRejected()

    Gets the PolicyQualifiersRejected flag. If this flag is true, certificates that include policy qualifiers in a certificate policies extension that is marked critical are rejected. If the flag is false, certificates are not rejected on this basis.
    When a PKIXParameters object is created, this flag is set to true. This setting reflects the most common (and simplest) strategy for processing policy qualifiers. Applications that want to use a more sophisticated policy must set this flag to false.

    Returns:
      the current value of the PolicyQualifiersRejected flag
    See Also:
      `setPolicyQualifiersRejected(boolean)`

  ### getDate

      public java.util.Date getDate()

    Returns the time for which the validity of the certification path should be determined. If null, the current time is used.
    Note that the Date returned is copied to protect against subsequent modifications.

    Returns:
      the Date, or `null` if not set
    See Also:
      `setDate(java.util.Date)`

  ### setDate

      public void setDate(java.util.Date date)

    Sets the time for which the validity of the certification path should be determined. If null, the current time is used.
    Note that the Date supplied here is copied to protect against subsequent modifications.

    Parameters:
      `date` - the Date, or `null` for the current time
    See Also:
      `getDate()`

  ### setCertPathCheckers

      public void setCertPathCheckers(List checkers)

    Sets a `List` of additional certification path checkers. If the specified List contains an object that is not a PKIXCertPathChecker, it is ignored.
    Each `PKIXCertPathChecker` specified implements additional checks on a certificate. Typically, these are checks to process and verify private extensions contained in certificates. Each `PKIXCertPathChecker` should be instantiated with any initialization parameters needed to execute the check.
    This method allows sophisticated applications to extend a PKIX `CertPathValidator` or `CertPathBuilder`. Each of the specified PKIXCertPathCheckers will be called, in turn, by a PKIX `CertPathValidator` or `CertPathBuilder` for each certificate processed or validated.
    Regardless of whether these additional PKIXCertPathCheckers are set, a PKIX `CertPathValidator` or `CertPathBuilder` must perform all of the required PKIX checks on each certificate. The one exception to this rule is if the RevocationEnabled flag is set to false (see the `setRevocationEnabled` method).
    Note that the List supplied here is copied and each PKIXCertPathChecker in the list is cloned to protect against subsequent modifications.

    Parameters:
      `checkers` - a List of PKIXCertPathCheckers. May be null, in which case no additional checkers will be used.
    Throws:
      `java.lang.ClassCastException` - if any of the elements in the list are not of type `java.security.cert.PKIXCertPathChecker`
    See Also:
      `getCertPathCheckers()`

  ### getCertPathCheckers

      public List getCertPathCheckers()

    Returns the List of certification path checkers. The returned List is immutable, and each PKIXCertPathChecker in the List is cloned to protect against subsequent modifications.

    Returns:
      an immutable List of PKIXCertPathCheckers (may be empty, but not `null`)
    See Also:
      `setCertPathCheckers(java.util.List)`

  ### addCertPathChecker

      public void addCertPathChecker(PKIXCertPathChecker checker)

    Adds a PKIXCertPathChecker to the list of certification path checkers. See the `setCertPathCheckers(java.util.List)` method for more details.
    Note that the `PKIXCertPathChecker` is cloned to protect against subsequent modifications.

    Parameters:
      `checker` - a `PKIXCertPathChecker` to add to the list of checks. If `null`, the checker is ignored (not added to list).

  ### getSigProvider

      public java.lang.String getSigProvider()

    Returns the signature provider's name, or `null` if not set.

    Returns:
      the signature provider's name (or `null`)
    See Also:
      `setSigProvider(java.lang.String)`

  ### setSigProvider

      public void setSigProvider(java.lang.String sigProvider)

    Sets the signature provider's name. The specified provider will be preferred when creating Signature objects. If null or not set, the first provider found supporting the algorithm will be used.

    Parameters:
      `sigProvider` - the signature provider's name (or `null`)
    See Also:
      `getSigProvider()`

  ### getTargetCertConstraints

      public CertSelector getTargetCertConstraints()

    Returns the required constraints on the target certificate. The constraints are returned as an instance of CertSelector. If `null`, no constraints are defined.
    Note that the CertSelector returned is cloned to protect against subsequent modifications.

    Returns:
      a CertSelector specifying the constraints on the target certificate (or `null`)
    See Also:
      `setTargetCertConstraints(java.security.cert.CertSelector)`

  ### setTargetCertConstraints

      public void setTargetCertConstraints(CertSelector selector)

    Sets the required constraints on the target certificate. The constraints are specified as an instance of CertSelector. If null, no constraints are defined.
    Note that the CertSelector specified is cloned to protect against subsequent modifications.

    Parameters:
      `selector` - a CertSelector specifying the constraints on the target certificate (or `null`)
    See Also:
      `getTargetCertConstraints()`

  ### clone

      public java.lang.Object clone()

    Makes a copy of this PKIXParameters object. Changes to the copy will not affect the original and vice versa.

    Specified by:
      `clone` in interface `CertPathParameters`
    Overrides:
      `clone` in class `java.lang.Object`
    Returns:
      a copy of this `PKIXParameters` object

  ### toString

      public java.lang.String toString()

    Returns a formatted string describing the parameters.

    Overrides:
      `toString` in class `java.lang.Object`
    Returns:
      a formatted string describing the parameters.

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