TrustAnchor

java.lang.Object
- java.security.cert.TrustAnchor

```
public class TrustAnchor
extends Object
```
A trust anchor or most-trusted Certification Authority (CA).
This class represents a "most-trusted CA", which is used as a trust anchor for validating X.509 certification paths. A most-trusted CA includes the public key of the CA, the CA's name, and any constraints upon the set of paths which may be validated using this key. These parameters can be specified in the form of a trusted X509Certificate or as individual parameters.
Concurrent Access
All TrustAnchor objects must be immutable and thread-safe. That is, multiple threads may concurrently invoke the methods defined in this class on a single TrustAnchor object (or more than one) with no ill effects. Requiring TrustAnchor objects to be immutable and thread-safe allows them to be passed around to various pieces of code without worrying about coordinating access. This stipulation applies to all public fields and methods of this class and any added or overridden by subclasses.

从以下版本开始:

1.4

另请参阅:

PKIXParameters(Set), PKIXBuilderParameters(Set, CertSelector)

构造器概要

构造器
构造器	说明
`TrustAnchor(String caName, PublicKey pubKey, byte[] nameConstraints)`	Creates an instance of `TrustAnchor` where the most-trusted CA is specified as a distinguished name and public key.
`TrustAnchor(X509Certificate trustedCert, byte[] nameConstraints)`	Creates an instance of `TrustAnchor` with the specified `X509Certificate` and optional name constraints, which are intended to be used as additional constraints when validating an X.509 certification path.
`TrustAnchor(X500Principal caPrincipal, PublicKey pubKey, byte[] nameConstraints)`	Creates an instance of `TrustAnchor` where the most-trusted CA is specified as an X500Principal and public key.

方法概要

所有方法实例方法具体方法
限定符和类型	方法	说明
`X500Principal`	`getCA()`	Returns the name of the most-trusted CA as an X500Principal.
`String`	`getCAName()`	Returns the name of the most-trusted CA in RFC 2253 `String` format.
`PublicKey`	`getCAPublicKey()`	Returns the public key of the most-trusted CA.
`byte[]`	`getNameConstraints()`	Returns the name constraints parameter.
`X509Certificate`	`getTrustedCert()`	Returns the most-trusted CA certificate.
`String`	`toString()`	Returns a formatted string describing the `TrustAnchor`.

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- 构造器详细资料
  - TrustAnchor
```
public TrustAnchor(X509Certificate trustedCert,
                   byte[] nameConstraints)
```
    Creates an instance of TrustAnchor with the specified X509Certificate and optional name constraints, which are intended to be used as additional constraints when validating an X.509 certification path.
    The name constraints are specified as a byte array. This byte array should contain the DER encoded form of the name constraints, as they would appear in the NameConstraints structure defined in RFC 5280 and X.509. The ASN.1 definition of this structure appears below.
```
  NameConstraints ::= SEQUENCE {
       permittedSubtrees       [0]     GeneralSubtrees OPTIONAL,
       excludedSubtrees        [1]     GeneralSubtrees OPTIONAL }

  GeneralSubtrees ::= SEQUENCE SIZE (1..MAX) OF GeneralSubtree

  GeneralSubtree ::= SEQUENCE {
       base                    GeneralName,
       minimum         [0]     BaseDistance DEFAULT 0,
       maximum         [1]     BaseDistance OPTIONAL }

  BaseDistance ::= INTEGER (0..MAX)

  GeneralName ::= CHOICE {
       otherName                       [0]     OtherName,
       rfc822Name                      [1]     IA5String,
       dNSName                         [2]     IA5String,
       x400Address                     [3]     ORAddress,
       directoryName                   [4]     Name,
       ediPartyName                    [5]     EDIPartyName,
       uniformResourceIdentifier       [6]     IA5String,
       iPAddress                       [7]     OCTET STRING,
       registeredID                    [8]     OBJECT IDENTIFIER}
 
```
    Note that the name constraints byte array supplied is cloned to protect against subsequent modifications.
    参数:
    
    trustedCert - a trusted X509Certificate
    
    nameConstraints - a byte array containing the ASN.1 DER encoding of a NameConstraints extension to be used for checking name constraints. Only the value of the extension is included, not the OID or criticality flag. Specify null to omit the parameter.
    
    抛出:
    
    IllegalArgumentException - if the name constraints cannot be decoded
    
    NullPointerException - if the specified X509Certificate is null
  - TrustAnchor
```
public TrustAnchor(X500Principal caPrincipal,
                   PublicKey pubKey,
                   byte[] nameConstraints)
```
    Creates an instance of TrustAnchor where the most-trusted CA is specified as an X500Principal and public key. Name constraints are an optional parameter, and are intended to be used as additional constraints when validating an X.509 certification path.
    The name constraints are specified as a byte array. This byte array contains the DER encoded form of the name constraints, as they would appear in the NameConstraints structure defined in RFC 5280 and X.509. The ASN.1 notation for this structure is supplied in the documentation for TrustAnchor(X509Certificate trustedCert, byte[] nameConstraints) .
    Note that the name constraints byte array supplied here is cloned to protect against subsequent modifications.
    
    参数:
    
    caPrincipal - the name of the most-trusted CA as X500Principal
    
    pubKey - the public key of the most-trusted CA
    
    nameConstraints - a byte array containing the ASN.1 DER encoding of a NameConstraints extension to be used for checking name constraints. Only the value of the extension is included, not the OID or criticality flag. Specify null to omit the parameter.
    
    抛出:
    
    NullPointerException - if the specified caPrincipal or pubKey parameter is null
    
    从以下版本开始:
    
    1.5
  - TrustAnchor
```
public TrustAnchor(String caName,
                   PublicKey pubKey,
                   byte[] nameConstraints)
```
    Creates an instance of TrustAnchor where the most-trusted CA is specified as a distinguished name and public key. Name constraints are an optional parameter, and are intended to be used as additional constraints when validating an X.509 certification path.
    The name constraints are specified as a byte array. This byte array contains the DER encoded form of the name constraints, as they would appear in the NameConstraints structure defined in RFC 5280 and X.509. The ASN.1 notation for this structure is supplied in the documentation for TrustAnchor(X509Certificate trustedCert, byte[] nameConstraints) .
    Note that the name constraints byte array supplied here is cloned to protect against subsequent modifications.
    
    参数:
    
    caName - the X.500 distinguished name of the most-trusted CA in RFC 2253 String format
    
    pubKey - the public key of the most-trusted CA
    
    nameConstraints - a byte array containing the ASN.1 DER encoding of a NameConstraints extension to be used for checking name constraints. Only the value of the extension is included, not the OID or criticality flag. Specify null to omit the parameter.
    
    抛出:
    
    IllegalArgumentException - if the specified caName parameter is empty (caName.length() == 0) or incorrectly formatted or the name constraints cannot be decoded
    
    NullPointerException - if the specified caName or pubKey parameter is null
- 方法详细资料
  - getTrustedCert
```
public final X509Certificate getTrustedCert()
```
    Returns the most-trusted CA certificate.
    
    返回:
    
    a trusted X509Certificate or null if the trust anchor was not specified as a trusted certificate
  - getCA
```
public final X500Principal getCA()
```
    Returns the name of the most-trusted CA as an X500Principal.
    
    返回:
    
    the X.500 distinguished name of the most-trusted CA, or null if the trust anchor was not specified as a trusted public key and name or X500Principal pair
    
    从以下版本开始:
    
    1.5
  - getCAName
```
public final String getCAName()
```
    Returns the name of the most-trusted CA in RFC 2253 String format.
    
    返回:
    
    the X.500 distinguished name of the most-trusted CA, or null if the trust anchor was not specified as a trusted public key and name or X500Principal pair
  - getCAPublicKey
```
public final PublicKey getCAPublicKey()
```
    Returns the public key of the most-trusted CA.
    
    返回:
    
    the public key of the most-trusted CA, or null if the trust anchor was not specified as a trusted public key and name or X500Principal pair
  - getNameConstraints
```
public final byte[] getNameConstraints()
```
    Returns the name constraints parameter. The specified name constraints are associated with this trust anchor and are intended to be used as additional constraints when validating an X.509 certification path.
    The name constraints are returned as a byte array. This byte array contains the DER encoded form of the name constraints, as they would appear in the NameConstraints structure defined in RFC 5280 and X.509. The ASN.1 notation for this structure is supplied in the documentation for TrustAnchor(X509Certificate trustedCert, byte[] nameConstraints) .
    Note that the byte array returned is cloned to protect against subsequent modifications.
    
    返回:
    
    a byte array containing the ASN.1 DER encoding of a NameConstraints extension used for checking name constraints, or null if not set.
  - toString
```
public String toString()
```
    Returns a formatted string describing the TrustAnchor.
    
    覆盖:
    
    toString 在类中 Object
    
    返回:
    
    a formatted string describing the TrustAnchor

类 TrustAnchor

构造器概要

方法概要

从类继承的方法 java.lang.Object

构造器详细资料

TrustAnchor

TrustAnchor

TrustAnchor

方法详细资料

getTrustedCert

getCA

getCAName

getCAPublicKey

getNameConstraints

toString