@Override
    public String toString() {
        StringBuilder sb = new StringBuilder("OpenSSLECPrivateKey{");
        sb.append("params={");
        sb.append(NativeCrypto.EVP_PKEY_print_params(key.getNativeRef()));
        sb.append("}}");
        return sb.toString();
    }
Wraps the provided private key for use in the TLS/SSL stack only. Sign/decrypt operations
using the key will be delegated to the {@code Signature}/{@code Cipher} implementation of the
provider which accepts the key.
common/src/main/java/org/conscrypt/OpenSSLECPrivateKey.java