Signs the specified {@link JWSObject#getSigningInput input} of a {@link JWSObject JWS object}.
@param header The JSON Web Signature (JWS) header. Must specify a supported JWS algorithm and must not be {@code null}.
@param signingInput The input to sign. Must not be {@code null}.
@return The resulting signature part (third part) of the JWS object.
@throws JOSEException If the JWS algorithm is not supported or ifsigning failed for some other reason.
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