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EdECPoint
class EdECPoint
An elliptic curve point used to specify keys as defined by RFC 8032: Edwards-Curve Digital Signature Algorithm (EdDSA). These points are distinct from the points represented by ECPoint, and they are intended for use with algorithms based on RFC 8032 such as the EdDSA Signature algorithm.
An EdEC point is specified by its y-coordinate value and a boolean that indicates whether the x-coordinate is odd. The y-coordinate is an element of the field of integers modulo some value p that is determined by the algorithm parameters. This field element is represented by a BigInteger, and implementations that consume objects of this class may reject integer values which are not in the range [0, p).
Summary
| Public constructors |
|
Construct an EdECPoint.
|
| Public methods |
| BigInteger |
Get the y-coordinate of the point.
|
| Boolean |
Get whether the x-coordinate of the point is odd.
|
Public constructors
EdECPoint
EdECPoint(
xOdd: Boolean,
y: BigInteger)
Construct an EdECPoint.
| Parameters |
xOdd |
Boolean: whether the x-coordinate is odd. |
y |
BigInteger: the y-coordinate, represented using a BigInteger. |
| Exceptions |
java.lang.NullPointerException |
if y is null. |
Public methods
getY
fun getY(): BigInteger
Get the y-coordinate of the point.
| Return |
BigInteger |
the y-coordinate, represented using a BigInteger. |
isXOdd
fun isXOdd(): Boolean
Get whether the x-coordinate of the point is odd.
| Return |
Boolean |
a boolean indicating whether the x-coordinate is odd. |
Content and code samples on this page are subject to the licenses described in the Content License. Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.
Last updated 2025-02-10 UTC.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-02-10 UTC."],[],[],null,["# EdECPoint\n\nAdded in [API level 33](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)\n\nEdECPoint\n=========\n\n```\nclass EdECPoint\n```\n\n|---|-----------------------------------|\n| [kotlin.Any](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/index.html) ||\n| ↳ | [java.security.spec.EdECPoint](#) |\n\nAn elliptic curve point used to specify keys as defined by [RFC 8032: Edwards-Curve Digital Signature Algorithm (EdDSA)](https://tools.ietf.org/html/rfc8032). These points are distinct from the points represented by `ECPoint`, and they are intended for use with algorithms based on RFC 8032 such as the EdDSA `Signature` algorithm.\n\nAn EdEC point is specified by its y-coordinate value and a boolean that indicates whether the x-coordinate is odd. The y-coordinate is an element of the field of integers modulo some value p that is determined by the algorithm parameters. This field element is represented by a `BigInteger`, and implementations that consume objects of this class may reject integer values which are not in the range \\[0, p).\n\nSummary\n-------\n\n| Public constructors ||\n|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---|\n| [EdECPoint](#EdECPoint(kotlin.Boolean,%20java.math.BigInteger))`(`xOdd:` `[Boolean](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-boolean/index.html)`, `y:` `[BigInteger](../../math/BigInteger.html#)`)` Construct an EdECPoint. |\n\n| Public methods ||\n|------------------------------------------------------------------------------------|---------------------------------------------------------------------------|\n| [BigInteger](../../math/BigInteger.html#) | [getY](#getY())`()` Get the y-coordinate of the point. |\n| [Boolean](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-boolean/index.html) | [isXOdd](#isXOdd())`()` Get whether the x-coordinate of the point is odd. |\n\nPublic constructors\n-------------------\n\n### EdECPoint\n\nAdded in [API level 33](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) \n\n```\nEdECPoint(\n xOdd: Boolean, \n y: BigInteger)\n```\n\nConstruct an EdECPoint.\n\n| Parameters ||\n|--------|----------------------------------------------------------------------------------------------------------------------|\n| `xOdd` | [Boolean](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-boolean/index.html): whether the x-coordinate is odd. |\n| `y` | [BigInteger](../../math/BigInteger.html#): the y-coordinate, represented using a `BigInteger`. |\n\n| Exceptions ||\n|----------------------------------|-----------------|\n| `java.lang.NullPointerException` | if `y` is null. |\n\nPublic methods\n--------------\n\n### getY\n\nAdded in [API level 33](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) \n\n```\nfun getY(): BigInteger\n```\n\nGet the y-coordinate of the point.\n\n| Return ||\n|-------------------------------------------|-----------------------------------------------------|\n| [BigInteger](../../math/BigInteger.html#) | the y-coordinate, represented using a `BigInteger`. |\n\n### isXOdd\n\nAdded in [API level 33](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) \n\n```\nfun isXOdd(): Boolean\n```\n\nGet whether the x-coordinate of the point is odd.\n\n| Return ||\n|------------------------------------------------------------------------------------|-------------------------------------------------------|\n| [Boolean](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-boolean/index.html) | a boolean indicating whether the x-coordinate is odd. |"]]
