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Added in API level 1
Summary: Ctors | Methods | Inherited Methods | [Expand All]

EllipticCurve

public class EllipticCurve
extends Object

java.lang.Object
    java.security.spec.EllipticCurve

这个不可变的类拥有表示椭圆曲线所需的必要值。

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摘要(Summary)

Public constructors
EllipticCurve(ECField field, BigInteger a, BigInteger b)

用指定的椭圆字段 field和系数 a和 b创建椭圆曲线。
EllipticCurve(ECField field, BigInteger a, BigInteger b, byte[] seed)

使用指定的椭圆字段 field ，系数 a和 b以及用于曲线生成的 seed创建椭圆曲线。

公共方法(Public methods)
boolean equals(Object obj)

将这个椭圆曲线与指定的对象进行比较。
BigInteger getA()

返回椭圆曲线的第一个系数 a 。
BigInteger getB()

返回椭圆曲线的第二个系数 b 。
ECField getField()

返回此椭圆曲线结束的有限域 field 。
byte[] getSeed()

返回曲线生成期间使用的播种字节 seed 。
int hashCode()

返回此椭圆曲线的哈希码值。

继承方法(Inherited methods)
From class java.lang.Object

Public constructors

EllipticCurve

Added in API level 1 
EllipticCurve (ECField field, 
                BigInteger a, 
                BigInteger b)

用指定的椭圆字段 field和系数 a和 b创建椭圆曲线。

参数(Parameters)
field ECField: the finite field that this elliptic curve is over.
a BigInteger: the first coefficient of this elliptic curve.
b BigInteger: the second coefficient of this elliptic curve.
抛出异常(Throws)
NullPointerException if field, a, or b is null.
IllegalArgumentException if a or b is not null and not in field.

EllipticCurve

Added in API level 1 
EllipticCurve (ECField field, 
                BigInteger a, 
                BigInteger b, 
                byte[] seed)

使用指定的椭圆字段 field ，系数 a和 b以及用于曲线生成的 seed创建椭圆曲线。

参数(Parameters)
field ECField: the finite field that this elliptic curve is over.
a BigInteger: the first coefficient of this elliptic curve.
b BigInteger: the second coefficient of this elliptic curve.
seed byte: the bytes used during curve generation for later validation. Contents of this array are copied to protect against subsequent modification.
抛出异常(Throws)
NullPointerException if field, a, or b is null.
IllegalArgumentException if a or b is not null and not in field.

公共方法(Public methods)

equals

Added in API level 1 
boolean equals (Object obj)

将这个椭圆曲线与指定的对象进行比较。

参数(Parameters)
obj Object: the object to be compared.
返回(Returns)
boolean true if obj is an instance of EllipticCurve and the field, A, and B match, false otherwise.

getA

Added in API level 1 
BigInteger getA ()

返回椭圆曲线的第一个系数 a 。

返回(Returns)
BigInteger the first coefficient a.

getB

Added in API level 1 
BigInteger getB ()

返回椭圆曲线的第二个系数 b 。

返回(Returns)
BigInteger the second coefficient b.

getField

Added in API level 1 
ECField getField ()

返回此椭圆曲线结束的有限域 field 。

返回(Returns)
ECField the field field that this curve is over.

getSeed

Added in API level 1 
byte[] getSeed ()

返回曲线生成过程中使用的播种字节seed 。 如果未指定，可能为null。

返回(Returns)
byte[] the seeding bytes seed. A new array is returned each time this method is called.

hashCode

Added in API level 1 
int hashCode ()

返回此椭圆曲线的哈希码值。

返回(Returns)
int a hash code value computed from the hash codes of the field, A, and B, as follows: (field.hashCode() << 6) + (a.hashCode() << 4) + (b.hashCode() << 2)
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