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## org.bouncycastle.crypto.signers
Class ECCSISigner

    java.lang.Object
      org.bouncycastle.crypto.signers.ECCSISigner

All Implemented Interfaces:
  Signer

public class ECCSISigner
extends java.lang.Object
implements Signer

Implementation of Elliptic Curve-based Certificateless Signatures for Identity-Based Encryption (ECCSI) as defined in RFC 6507.

See Also:
  RFC 6507: Elliptic Curve-Based Certificateless Signatures for Identity-Based Encryption (ECCSI)

Constructor Summary
`ECCSISigner(ECPoint kpak, X9ECParameters params, Digest digest, byte[] id)` Constructs an ECCSI signer/verifier with KMS Public Authentication Key and user identity.

Method Summary
`byte[]` | `generateSignature()` Generates an ECCSI signature according to RFC 6507 Section 5.2.1.
`void` | `init(boolean forSigning, CipherParameters param)` Initializes the signer for either signature generation or verification.
`void` | `reset()` Resets the signer/verifier state and performs initial computations: - For signing: Validates KPAK consistency (RFC 6507 Section 5.1.2) - For verification: Computes Y = HS·PVT + KPAK Also computes HS = hash(G || KPAK || ID || PVT) as per RFC 6507 Section 5.1.1
`void` | `update(byte b)` update the internal digest with the byte b
`void` | `update(byte[] in, int off, int len)` update the internal digest with the byte array in
`boolean` | `verifySignature(byte[] signature)` Verifies an ECCSI signature according to RFC 6507 Section 5.2.2.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### ECCSISigner

    public ECCSISigner(ECPoint kpak,
                       X9ECParameters params,
                       Digest digest,
                       byte[] id)

  Constructs an ECCSI signer/verifier with KMS Public Authentication Key and user identity.

Parameters:
  `kpak` - KMS Public Authentication Key (KPAK) from RFC 6507 Section 2
  `id` - User identity byte array formatted

Method Detail

### init

    public void init(boolean forSigning,
                     CipherParameters param)

  Initializes the signer for either signature generation or verification.

  Specified by:
    `init` in interface `Signer`
  Parameters:
    `forSigning` - true for signing, false for verification
    `param` - Key parameters: - For signing: containing - For verification:
  Throws:
    `java.lang.IllegalArgumentException` - if invalid parameters are provided

### update

    public void update(byte b)

  Description copied from interface: `Signer`
  update the internal digest with the byte b

  Specified by:
    `update` in interface `Signer`

### update

    public void update(byte[] in,
                       int off,
                       int len)

  Description copied from interface: `Signer`
  update the internal digest with the byte array in

  Specified by:
    `update` in interface `Signer`

### generateSignature

    public byte[] generateSignature()
                             throws CryptoException,
                                    DataLengthException

  Generates an ECCSI signature according to RFC 6507 Section 5.2.1.

  Specified by:
    `generateSignature` in interface `Signer`
  Returns:
    Signature structure containing: - r (N bytes) - s (N bytes) - PVT (Public Validation Token)
  Throws:
    `CryptoException` - if cryptographic operations fail
    `DataLengthException` - if input data is invalid
    `java.lang.IllegalArgumentException` - if invalid SSK or j parameter is detected

### verifySignature

    public boolean verifySignature(byte[] signature)

  Verifies an ECCSI signature according to RFC 6507 Section 5.2.2.

  Specified by:
    `verifySignature` in interface `Signer`
  Parameters:
    `signature` - Signature to verify (r || s || PVT)
  Returns:
    true if signature is valid, false otherwise
  Throws:
    `java.lang.IllegalArgumentException` - if signature format is invalid

### reset

    public void reset()

  Resets the signer/verifier state and performs initial computations: - For signing: Validates KPAK consistency (RFC 6507 Section 5.1.2) - For verification: Computes Y = HS·PVT + KPAK Also computes HS = hash(G || KPAK || ID || PVT) as per RFC 6507 Section 5.1.1

  Specified by:
    `reset` in interface `Signer`

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