question: private void calculateAtHashClaim ( final OAuth2AccessTokenEntity accessToken , final JWSAlgorithm signingAlg , final JWTClaimsSet . Builder idClaims , final Set < String > responseTypes ) { if ( responseTypes . contains ( OIDCConstants . TOKEN ) ) { final Base64URL atHash = IdTokenHashUtils . getAccessTokenHash ( signingAlg , accessToken ) ; idClaims . claim ( OIDCConstants . AT_HASH , atHash ) ; log . debug ( "{} is set to {}" , OIDCConstants . AT_HASH , atHash ) ; } }
target:  Calculate at hash claim.