package com.chakracoin.shsm.cert;


import com.sunyard.ssp.BytesUtil;

import java.security.PublicKey;

public class SimplePublicKey implements PublicKey {

    private byte[] encoded;

    public SimplePublicKey(String str) {
        this.encoded = BytesUtil.hexString2Bytes( str );
    }

    @Override
    public String getAlgorithm() {
        return "EC";
    }

    @Override
    public String getFormat() {
        return "PKCS#8";
    }

    @Override
    public byte[] getEncoded() {
        return this.encoded;
    }


    public static SimplePublicKey getSimplePublickKey(String der) {

        if (null == der || !der.startsWith("03420004") ) {
            throw new IllegalArgumentException("公钥格式错误");
        }

        int headLen = 8;
        int len = ( der.length() - 8 ) / 2;

        String strcertPKX = der.substring(headLen, headLen + 64);
        String strcertPKY = der.substring(headLen + len, headLen + len + 64);
        der = "03420004" + strcertPKX + strcertPKY;

        return new SimplePublicKey("3059301306072A8648CE3D020106082A811CCF5501822D" + der );
    }
}