com.playboy.safe.util.Base64Utils Maven / Gradle / Ivy

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针对sm2和sm4两种加密算法的java实现
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package com.playboy.safe.util;

import com.bouncycastle.util.encoders.Base64;

import java.io.*;

public class Base64Utils {

    private static final int CACHE_SIZE = 1024;
    

    public static byte[] decode(String base64,String encoding) throws Exception {
        return Base64.decode(base64.getBytes(encoding));
    }
    
    public static byte[] decode(String base64) throws Exception{
    	    return Base64.decode(base64.getBytes());
    }

    public static String encode(byte[] bytes) throws Exception {
        return new String(Base64.encode(bytes));
    }
    

    public static String encodeFile(String filePath) throws Exception {
        byte[] bytes = fileToByte(filePath);
        return encode(bytes);
    }
    

    public static void decodeToFile(String filePath, String base64,String encoding) throws Exception {
        byte[] bytes = decode(base64,encoding);
        byteArrayToFile(bytes, filePath);
    }
    

    public static byte[] fileToByte(String filePath) throws Exception {
        byte[] data = new byte[0];
        File file = new File(filePath);
        if (file.exists()) {
            FileInputStream in = new FileInputStream(file);
            ByteArrayOutputStream out = new ByteArrayOutputStream(2048);
            byte[] cache = new byte[CACHE_SIZE];
            int nRead = 0;
            while ((nRead = in.read(cache)) != -1) {
                out.write(cache, 0, nRead);
                out.flush();
            }
            out.close();
            in.close();
            data = out.toByteArray();
         }
        return data;
    }
    

    public static void byteArrayToFile(byte[] bytes, String filePath) throws Exception {
        InputStream in = new ByteArrayInputStream(bytes);   
        File destFile = new File(filePath);
        if (!destFile.getParentFile().exists()) {
            destFile.getParentFile().mkdirs();
        }
        destFile.createNewFile();
        OutputStream out = new FileOutputStream(destFile);
        byte[] cache = new byte[CACHE_SIZE];
        int nRead = 0;
        while ((nRead = in.read(cache)) != -1) {   
            out.write(cache, 0, nRead);
            out.flush();
        }
        out.close();
        in.close();
    }
    
}