KeyResolver (JPaseto :: API 0.6.0 API)

All Known Implementing Classes:

KeyResolverAdapter
```
public interface KeyResolver
```
A PubicKeyResolver can be used by a PasetoParser to find a public key that should be used to verify a paseto token signature.
A PubicKeyResolver is necessary when the signing key is not already known before parsing the paseto token and the token payload or footer (plaintext or claims) must be inspected first to determine how to look up the signing key. Once returned by the resolver, the PasetoParser will then verify the token signature with the returned key. For example:
```
 Paseto token = Pasetos.parserBuilder().setSigningKeyResolver(new KeyResolverAdapter() {
         @Override
         public byte[] resolvePublicKeyBytes(Paseto paseto) {
             //inspect the header or claims, lookup and return the signing key
             return getPublicKeyBytes(paseto); //implement me
         }})
     .build()
     .parse(tokenString);
 
```
A PubicKeyResolver is invoked once during parsing before the signature is verified.

KeyResolverAdapter

If you only need to resolve a signing key for a particular type of token, consider using the KeyResolverAdapter and overriding only the method you need to support instead of implementing this interface directly.
Since:

0.1

See Also:

KeyResolverAdapter

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`java.security.PublicKey`	`resolvePublicKey(Version version, Purpose purpose, FooterClaims footer)`	Returns the signing key that should be used to validate a digital signature for the paseto token.
`javax.crypto.SecretKey`	`resolveSharedKey(Version version, Purpose purpose, FooterClaims footer)`	Returns the signing key that should be used to validate a digital signature for the paseto token.

- Method Detail
  - resolvePublicKey
```
java.security.PublicKey resolvePublicKey(Version version,
                                         Purpose purpose,
                                         FooterClaims footer)
```
    Returns the signing key that should be used to validate a digital signature for the paseto token.
    
    Parameters:
    
    version - the version of the token to be parsed
    
    purpose - the purpose of the token to be parsed
    
    footer - the footer containing claims or plain text of the token to be parsed
    
    Returns:
    
    the public key that should be used to validate a digital signature for the token.
  - resolveSharedKey
```
javax.crypto.SecretKey resolveSharedKey(Version version,
                                        Purpose purpose,
                                        FooterClaims footer)
```
    Returns the signing key that should be used to validate a digital signature for the paseto token.
    
    Parameters:
    
    version - the version of the token to be parsed
    
    purpose - the purpose of the token to be parsed
    
    footer - the footer containing claims or plain text of the token to be parsed
    
    Returns:
    
    the shared key that should be used to decrypt the token.