ECMQVBasicAgreement (Bouncy Castle Library 1.85 API Specification)
Date: 2026-07-12

org.bouncycastle.crypto.agreement

## Class ECMQVBasicAgreement

- java.lang.Object
- - org.bouncycastle.crypto.agreement.ECMQVBasicAgreement

- All Implemented Interfaces:
    BasicAgreement

      public class ECMQVBasicAgreement
      extends java.lang.Object
      implements BasicAgreement

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `ECMQVBasicAgreement()`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `java.math.BigInteger` | `calculateAgreement(CipherParameters pubKey)` given a public key from a given party calculate the next message in the agreement sequence.
    `int` | `getFieldSize()` return the field size for the agreement algorithm in bytes.
    `void` | `init(CipherParameters key)` initialise the agreement engine.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### ECMQVBasicAgreement

          public ECMQVBasicAgreement()

  - ### Method Detail

    - #### init

          public void init(CipherParameters key)

      Description copied from interface: `BasicAgreement`
      initialise the agreement engine.
      Specified by:
        `init` in interface `BasicAgreement`

    - #### getFieldSize

          public int getFieldSize()

      Description copied from interface: `BasicAgreement`
      return the field size for the agreement algorithm in bytes.
      Specified by:
        `getFieldSize` in interface `BasicAgreement`

    - #### calculateAgreement

          public java.math.BigInteger calculateAgreement(CipherParameters pubKey)

      Description copied from interface: `BasicAgreement`
      given a public key from a given party calculate the next message in the agreement sequence.
      Specified by:
        `calculateAgreement` in interface `BasicAgreement`