ECFieldFp (Java SE 9 & JDK 9 ) (original) (raw)

• java.lang.Object

• • java.security.spec.ECFieldFp

• All Implemented Interfaces:
  [ECField](../../../java/security/spec/ECField.html "interface in java.security.spec")

public class ECFieldFp
extends Object
implements ECField
This immutable class defines an elliptic curve (EC) prime finite field.
Since:
1.5
See Also:
ECField

• • Constructor Summary

  Constructors

  Constructor	Description
  ECFieldFp​(BigInteger p)	Creates an elliptic curve prime finite field with the specified prime p.

  • Method Summary

  All Methods Instance Methods Concrete Methods

  Modifier and Type	Method	Description
  boolean	equals​(Object obj)	Compares this prime finite field for equality with the specified object.
  int	getFieldSize​()	Returns the field size in bits which is size of prime p for this prime finite field.
  BigInteger	getP​()	Returns the prime p of this prime finite field.
  int	hashCode​()	Returns a hash code value for this prime finite field.

     * ### Methods inherited from class java.lang.[Object](../../../java/lang/Object.html "class in java.lang")  
     `[clone](../../../java/lang/Object.html#clone--), [finalize](../../../java/lang/Object.html#finalize--), [getClass](../../../java/lang/Object.html#getClass--), [notify](../../../java/lang/Object.html#notify--), [notifyAll](../../../java/lang/Object.html#notifyAll--), [toString](../../../java/lang/Object.html#toString--), [wait](../../../java/lang/Object.html#wait--), [wait](../../../java/lang/Object.html#wait-long-), [wait](../../../java/lang/Object.html#wait-long-int-)`

• • Constructor Detail

     * #### ECFieldFp  
     public ECFieldFp​([BigInteger](../../../java/math/BigInteger.html "class in java.math") p)  
     Creates an elliptic curve prime finite field with the specified prime `p`.  
     Parameters:  
     `p` \- the prime.  
     Throws:  
     `[NullPointerException](../../../java/lang/NullPointerException.html "class in java.lang")` \- if `p` is null.  
     `[IllegalArgumentException](../../../java/lang/IllegalArgumentException.html "class in java.lang")` \- if `p` is not positive.  

  • Method Detail

    * #### getFieldSize  
    public int getFieldSize​()  
    Returns the field size in bits which is size of prime p for this prime finite field.  
    Specified by:  
    `[getFieldSize](../../../java/security/spec/ECField.html#getFieldSize--)` in interface `[ECField](../../../java/security/spec/ECField.html "interface in java.security.spec")`  
    Returns:  
    the field size in bits.  
    * #### getP  
    public [BigInteger](../../../java/math/BigInteger.html "class in java.math") getP​()  
    Returns the prime `p` of this prime finite field.  
    Returns:  
    the prime.  
    * #### equals  
    public boolean equals​([Object](../../../java/lang/Object.html "class in java.lang") obj)  
    Compares this prime finite field for equality with the specified object.  
    Overrides:  
    `[equals](../../../java/lang/Object.html#equals-java.lang.Object-)` in class `[Object](../../../java/lang/Object.html "class in java.lang")`  
    Parameters:  
    `obj` \- the object to be compared.  
    Returns:  
    true if `obj` is an instance of ECFieldFp and the prime value match, false otherwise.  
    See Also:  
    [Object.hashCode()](../../../java/lang/Object.html#hashCode--), [HashMap](../../../java/util/HashMap.html "class in java.util")  
    * #### hashCode  
    public int hashCode​()  
    Returns a hash code value for this prime finite field.  
    Overrides:  
    `[hashCode](../../../java/lang/Object.html#hashCode--)` in class `[Object](../../../java/lang/Object.html "class in java.lang")`  
    Returns:  
    a hash code value.  
    See Also:  
    [Object.equals(java.lang.Object)](../../../java/lang/Object.html#equals-java.lang.Object-), [System.identityHashCode(java.lang.Object)](../../../java/lang/System.html#identityHashCode-java.lang.Object-)

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