McElieceFujisakiCipher (Bouncy Castle Library 1.54 API Specification)
Date: 2015-12-29

org.bouncycastle.pqc.crypto.mceliece

## Class McElieceFujisakiCipher

- java.lang.Object
- - org.bouncycastle.pqc.crypto.mceliece.McElieceFujisakiCipher

- All Implemented Interfaces:
    MessageEncryptor

      public class McElieceFujisakiCipher
      extends java.lang.Object
      implements MessageEncryptor

  This class implements the Fujisaki/Okamoto conversion of the McEliecePKCS. Fujisaki and Okamoto propose hybrid encryption that merges a symmetric encryption scheme which is secure in the find-guess model with an asymmetric one-way encryption scheme which is sufficiently probabilistic to obtain a public key cryptosystem which is CCA2-secure. For details, see D. Engelbert, R. Overbeck, A. Schmidt, "A summary of the development of the McEliece Cryptosystem", technical report.

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static java.lang.String` | `OID` The OID of the algorithm.

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `McElieceFujisakiCipher()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `int` | `getKeySize(McElieceCCA2KeyParameters key)`
    `void` | `init(boolean forSigning, CipherParameters param)`
    `void` | `initCipherDecrypt(McElieceCCA2PrivateKeyParameters privKey)`
    `byte[]` | `messageDecrypt(byte[] input)`
    `byte[]` | `messageEncrypt(byte[] input)`

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

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

- - ### Field Detail

    - #### OID

          public static final java.lang.String OID

      The OID of the algorithm.
      See Also:
        Constant Field Values

  - ### Constructor Detail

    - #### McElieceFujisakiCipher

          public McElieceFujisakiCipher()

  - ### Method Detail

    - #### init

          public void init(boolean forSigning,
                  CipherParameters param)

      Specified by:
        `init` in interface `MessageEncryptor`
      Parameters:
        `forSigning` - true if we are encrypting a signature, false otherwise.
        `param` - key parameters for encryption or decryption.

    - #### getKeySize

          public int getKeySize(McElieceCCA2KeyParameters key)
                         throws java.lang.IllegalArgumentException

      Throws:
        `java.lang.IllegalArgumentException`

    - #### initCipherDecrypt

          public void initCipherDecrypt(McElieceCCA2PrivateKeyParameters privKey)

    - #### messageEncrypt

          public byte[] messageEncrypt(byte[] input)
                                throws java.lang.Exception

      Specified by:
        `messageEncrypt` in interface `MessageEncryptor`
      Parameters:
        `input` - the message to be signed.
      Throws:
        `java.lang.Exception`

    - #### messageDecrypt

          public byte[] messageDecrypt(byte[] input)
                                throws java.lang.Exception

      Specified by:
        `messageDecrypt` in interface `MessageEncryptor`
      Parameters:
        `input` - the cipher text of the message
      Throws:
        `java.lang.Exception`