java版ec64实现

傷城~ 2022-12-31 01:23 122阅读 0赞

前面实现了js ec64编解码/加解密字符串，把它转成java版，因为java 有byte类型，实现起来反倒比js更简单些

/**
         *byte array转为64字符表示
         *@bts 输入byte array
         *@sers 输入64个字符序列 如：+-0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
         *@return 返回转换后的字符串
         */
    	public static String enc64(byte[] bts, String sers) {
    		StringBuilder bd = new StringBuilder();
    		int len = bts.length;
    		int a=0,b=0;
    		for (int i = 0; i < len; i++) {
    			int it = bts[i] & 0xff;
    			a=a<<8|it;
    			b+=8;
    			while(b>=6) {
    				bd.append(sers.charAt(a>>(b-6)&0x3f));
    				b-=6;
    			}
    		}
    		if(b!=0) {
    			bd.append(sers.charAt(a<<(6-b)&0x3f));
    		}
    		return bd.toString();
    	}
        
    	/**
         *64字符表示的字符串
         *@bts 输入byte array
         *@sers 输入64个字符序列 如：+-0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
         *@return 返回 byte array
         */
    	public static byte[] dec64(String str, String sers) {
    		int len = str.length();
    		byte[] bts =new byte[len*3/4];
    		int a=0,b=0,n=0;
    		for (int i = 0; i < len; i++) {
    			int it = sers.indexOf(str.charAt(i));
    			a=a<<6|it;
    			b+=6;
    			while(b>=8) {
    				bts[n]=(byte) (a>>(b-8)&0xff);
    				b-=8;
    				n++;
    			}
    		}
    		return bts;
    	}
    	
        /**
         *根据字符串打乱序列
         *@s 字符串 如：密码等
         */
    	public static String krct(String s){
    		String z="+-0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
            int lnz=z.length();
            int lns=s.length();
            int lpn=lns+lnz;
            for(int i=0,j=0,k=0;i<lpn;i++){
                int it;
                if(i>lns-1){
                    it=z.charAt(j);
                    j++;
                }else{
                    it=s.charAt(k);
                    k++;
                }
                int m=it*(it>>3)%lnz;
                z=z.substring(m+1,lnz)+z.charAt(m)+z.substring(0,m);
            }
            return z;
    	}

测试代码：

public static void main(String[] args){
    		String seriesStr="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
    
    		String sa = "QWERTYUIOPASDFGHJKLZXCVBNMqwertyuiopasdfghjklzxcvbnm";
    		sa+="日照香炉生紫烟，遥看瀑布挂前川。飞流直下三千尺，疑是银河落九天。";
    		sa+="凹凸sdfsdf豆fgh豆腐干官方国家和的非监管环境㊣℃▧←↑→↓↔⇦⇧▢";
    	
    		System.out.println("-------------------------编解码----------------------------");
    		
    		String stra = enc64(sa.getBytes(), seriesStr);
    		System.out.println(stra);
    		
    		byte[] btsa = dec64(stra, seriesStr);
    		System.out.println(new String(btsa));
    	
    		System.out.println("-------------------------加解密----------------------------");
    		
    		String strb = enc64(sa.getBytes(), krct("PassWord123456"));
    		System.out.println(strb);
    		
    		byte[] btsb = dec64(strb, krct("PassWord123456"));
    		System.out.println(new String(btsb));
    		
    	}

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