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

org.bouncycastle.crypto.generators

## Class RSABlindingFactorGenerator

- java.lang.Object
- - org.bouncycastle.crypto.generators.RSABlindingFactorGenerator

-     public class RSABlindingFactorGenerator
      extends java.lang.Object

  Generate a random factor suitable for use with RSA blind signatures as outlined in Chaum's blinding and unblinding as outlined in "Handbook of Applied Cryptography", page 475.

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `RSABlindingFactorGenerator()`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `java.math.BigInteger` | `generateBlindingFactor()` Generate a suitable blind factor for the public key the generator was initialised with.
    `void` | `init(CipherParameters param)` Initialise the factor generator

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

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

- - ### Constructor Detail

    - #### RSABlindingFactorGenerator

          public RSABlindingFactorGenerator()

  - ### Method Detail

    - #### init

          public void init(CipherParameters param)

      Initialise the factor generator
      Parameters:
        `param` - the necessary RSA key parameters.

    - #### generateBlindingFactor

          public java.math.BigInteger generateBlindingFactor()

      Generate a suitable blind factor for the public key the generator was initialised with.
      Returns:
        a random blind factor