FixedLengthContentSigner (Bouncy Castle Library 1.85 API Specification)

All Superinterfaces:

ContentSigner
```
public interface FixedLengthContentSigner
extends ContentSigner
```
Extension of ContentSigner for signers whose signature encoding has a fixed, predictable length — RSA (PKCS#1 v1.5 and PSS: the modulus size), Ed25519/Ed448 and ML-DSA qualify; DER-encoded ECDSA/DSA do not (the INTEGER components vary in length).
This enables definite-length (DL/DER) streaming of CMS SignedData with encapsulated content: the SignerInfos trail the content in the encoding but their length feeds the enclosing headers, which are written before any content flows — so the signature length has to be committed up front.

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  int getSignatureLength()
  Return the exact length in octets of the signature this signer will produce.
  - Methods inherited from interface org.bouncycastle.operator.ContentSigner
    getAlgorithmIdentifier, getOutputStream, getSignature

- Method Detail
  - getSignatureLength
```
int getSignatureLength()
```
    Return the exact length in octets of the signature this signer will produce.
    
    Returns:
    
    the signature length, or -1 if it cannot be fixed in advance