BcMTCCosignerVerifierProvider (Bouncy Castle Library 1.85 API Specification)

java.lang.Object
- org.bouncycastle.cert.plants.bc.BcMTCCosignerVerifierProvider

All Implemented Interfaces:

MTCCosignerVerifierProvider
```
public class BcMTCCosignerVerifierProvider
extends java.lang.Object
implements MTCCosignerVerifierProvider
```
Lightweight-side MTCCosignerVerifierProvider that holds a table of cosigner trust anchor IDs mapped to MTCSignatureVerifier instances.
The convenience BcMTCCosignerVerifierProvider.Builder.addCosigner(byte[], AsymmetricKeyParameter) overload wraps a lightweight AsymmetricKeyParameter in a BcMTCSignatureVerifier, auto-detecting the draft algorithm identifier from the key type:
- ECPublicKeyParameters with a 256-bit field → ECDSA-P256-SHA256
- ECPublicKeyParameters with a 384-bit field → ECDSA-P384-SHA384
- Ed25519PublicKeyParameters → Ed25519
- MLDSAPublicKeyParameters → ML-DSA-44 / ML-DSA-65 / ML-DSA-87 per the key's parameter set
Callers needing a different algorithm string for the same key type, or a key flavour from another module (e.g. a JCA java.security.PublicKey wrapped in org.bouncycastle.cert.plants.jcajce.JcaMTCSignatureVerifier), can use BcMTCCosignerVerifierProvider.Builder.addCosigner(byte[], MTCSignatureVerifier) directly.

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static class BcMTCCosignerVerifierProvider.Builder
Builder for BcMTCCosignerVerifierProvider.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`MTCCosignerVerifier`	`get(byte[] cosignerId)`
`static BcMTCCosignerVerifierProvider`	`singleCosigner(byte[] cosignerId, MTCSignatureVerifier verifier)`	Convenience factory for the single-cosigner case — wraps `Builder().addCosigner(cosignerId, verifier).build()`.
`static BcMTCCosignerVerifierProvider`	`singleCosigner(byte[] cosignerId, org.bouncycastle.crypto.params.AsymmetricKeyParameter publicKey)`	Convenience factory for the single-cosigner case taking a lightweight public key; the draft algorithm identifier is detected from the key type.

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

- Method Detail
  - singleCosigner
```
public static BcMTCCosignerVerifierProvider singleCosigner(byte[] cosignerId,
                                                           MTCSignatureVerifier verifier)
```
    Convenience factory for the single-cosigner case — wraps Builder().addCosigner(cosignerId, verifier).build(). Suitable when the relying party trusts exactly one cosigner (e.g. the CA itself, per Section 5.3 of draft-ietf-plants-merkle-tree-certs).
  - singleCosigner
```
public static BcMTCCosignerVerifierProvider singleCosigner(byte[] cosignerId,
                                                           org.bouncycastle.crypto.params.AsymmetricKeyParameter publicKey)
```
    Convenience factory for the single-cosigner case taking a lightweight public key; the draft algorithm identifier is detected from the key type.
    
    Throws:
    
    java.lang.IllegalArgumentException - if the public key type is unsupported
  - get
```
public MTCCosignerVerifier get(byte[] cosignerId)
```
    Specified by:
    
    get in interface MTCCosignerVerifierProvider
    
    Parameters:
    
    cosignerId - the binary trust anchor ID of the cosigner
    
    Returns:
    
    a verifier for the cosigner, or null if the cosigner is unknown