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## org.bouncycastle.asn1.x9
Class KeySpecificInfo

    java.lang.Object
      org.bouncycastle.asn1.ASN1Object
          org.bouncycastle.asn1.x9.KeySpecificInfo

All Implemented Interfaces:
  ASN1Encodable, Encodable

public class KeySpecificInfo
extends ASN1Object

ASN.1 def for Diffie-Hellman key exchange KeySpecificInfo structure. See RFC 2631, or X9.42, for further details. KeySpecificInfo ::= SEQUENCE { algorithm OBJECT IDENTIFIER, counter OCTET STRING SIZE (4..4) }

Constructor Summary
`KeySpecificInfo(ASN1ObjectIdentifier algorithm, ASN1OctetString counter)` Base constructor.

Method Summary
`ASN1ObjectIdentifier` | `getAlgorithm()` The object identifier for the CEK wrapping algorithm.
`ASN1OctetString` | `getCounter()` The initial counter value for key derivation.
`static KeySpecificInfo` | `getInstance(ASN1TaggedObject taggedObject, boolean declaredExplicit)`
`static KeySpecificInfo` | `getInstance(java.lang.Object obj)` Return a KeySpecificInfo object from the passed in object.
`static KeySpecificInfo` | `getTagged(ASN1TaggedObject taggedObject, boolean declaredExplicit)`
`ASN1Primitive` | `toASN1Primitive()` Return an ASN.1 primitive representation of this object.

Methods inherited from class org.bouncycastle.asn1.ASN1Object
`encodeTo, encodeTo, equals, getEncoded, getEncoded, hasEncodedTagValue, hashCode`

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

Constructor Detail

### KeySpecificInfo

    public KeySpecificInfo(ASN1ObjectIdentifier algorithm,
                           ASN1OctetString counter)

  Base constructor.

Parameters:
  `algorithm` - algorithm identifier for the CEK.
  `counter` - initial counter value for key derivation.

Method Detail

### getInstance

    public static KeySpecificInfo getInstance(java.lang.Object obj)

  Return a KeySpecificInfo object from the passed in object.

  Parameters:
    `obj` - an object for conversion or a byte[].
  Returns:
    a KeySpecificInfo

### getInstance

    public static KeySpecificInfo getInstance(ASN1TaggedObject taggedObject,
                                              boolean declaredExplicit)

### getTagged

    public static KeySpecificInfo getTagged(ASN1TaggedObject taggedObject,
                                            boolean declaredExplicit)

### getAlgorithm

    public ASN1ObjectIdentifier getAlgorithm()

  The object identifier for the CEK wrapping algorithm.

  Returns:
    CEK wrapping algorithm OID.

### getCounter

    public ASN1OctetString getCounter()

  The initial counter value for key derivation.

  Returns:
    initial counter value as a 4 byte octet string (big endian).

### toASN1Primitive

    public ASN1Primitive toASN1Primitive()

  Return an ASN.1 primitive representation of this object.

  Specified by:
    `toASN1Primitive` in interface `ASN1Encodable`
  Specified by:
    `toASN1Primitive` in class `ASN1Object`
  Returns:
    a DERSequence containing the KeySpecificInfo values.

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