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package java.security.spec;
import java.math.BigInteger;
import java.util.Objects;
A class representing elliptic curve public keys as defined in RFC 7748,
including the curve and other algorithm parameters. The public key is a
particular point on the curve, which is represented using only its
u-coordinate. A u-coordinate is an element of the field of integers modulo
some value that is determined by the algorithm parameters. This field
element is represented by a BigInteger which may hold any value. That is,
the BigInteger is not restricted to the range of canonical field elements.
Since: 11
/**
* A class representing elliptic curve public keys as defined in RFC 7748,
* including the curve and other algorithm parameters. The public key is a
* particular point on the curve, which is represented using only its
* u-coordinate. A u-coordinate is an element of the field of integers modulo
* some value that is determined by the algorithm parameters. This field
* element is represented by a BigInteger which may hold any value. That is,
* the BigInteger is not restricted to the range of canonical field elements.
*
* @since 11
*/
public class XECPublicKeySpec implements KeySpec {
private final AlgorithmParameterSpec params;
private final BigInteger u;
Construct a public key spec using the supplied parameters and
u coordinate.
Params: - params – the algorithm parameters
- u – the u-coordinate of the point, represented using a BigInteger
which may hold any value
Throws: - NullPointerException – if
params
or u
is null.
/**
* Construct a public key spec using the supplied parameters and
* u coordinate.
*
* @param params the algorithm parameters
* @param u the u-coordinate of the point, represented using a BigInteger
* which may hold any value
*
* @throws NullPointerException if {@code params} or {@code u}
* is null.
*/
public XECPublicKeySpec(AlgorithmParameterSpec params, BigInteger u) {
Objects.requireNonNull(params, "params must not be null");
Objects.requireNonNull(u, "u must not be null");
this.params = params;
this.u = u;
}
Get the algorithm parameters that define the curve and other settings.
Returns: the parameters
/**
* Get the algorithm parameters that define the curve and other settings.
*
* @return the parameters
*/
public AlgorithmParameterSpec getParams() {
return params;
}
Get the u coordinate of the point.
Returns: the u-coordinate, represented using a BigInteger which may hold
any value
/**
* Get the u coordinate of the point.
*
* @return the u-coordinate, represented using a BigInteger which may hold
* any value
*/
public BigInteger getU() {
return u;
}
}