Sign data with ECDSA P-256 / SHA-256 (the JWS ES256 algorithm) using the given PKCS#8 EC private key (PEM), returning the raw 64-byte R||S signature.
Sign data with ECDSA P-256 / SHA-256 (the JWS ES256 algorithm) using the given PKCS#8 EC private key (PEM), returning the raw 64-byte R||S signature.