package com.android.format.lifecycle fun genKey(): String { return ABCDEFGHIJKLMNOPQRSTUVWXYZ .toCharArray() .apply { shuffle() } .concatToString() } //将所有的字符转成16进制比如{}\n //**.padStart(2, 0)** //如果 16 进制结果只有 1 位0~f**左边补 0固定占 2 个字符** //例10 → a → 补零后变成 0a //非常关键保证 hex 字符串总长度一定是偶数满足decode2要求require(hexString.length % 2 0) fun encode2(str: String): String { return str.toByteArray(Charsets.UTF_8).joinToString() { it.toUByte().toString(16).uppercase().padStart(2, 0) } } fun decode2(hexString: String): String? { require(hexString.length % 2 0) { Invalid hex string } val binaryData hexString.chunked(2).map { val high it[0].digitToIntOrNull(16) ?: -1 val low it[1].digitToIntOrNull(16) ?: -1 require(high 0 low 0) { Invalid hex string } ((high shl 4) low).toByte() }.toByteArray() return String(binaryData, Charsets.UTF_8) } fun decode(text: String, key: String): String? { val stringBuilder StringBuilder() for (i in 0 until text.length) { val c text[i].toString() var index key.indexOf(c) if (index ! -1) { index-- if (index 0) { index key.length - 1 } stringBuilder.append(key[index]) } else { stringBuilder.append(c) } } return stringBuilder.toString() //return decode2(stringBuilder.toString()); } fun encode(text: String, key: String): String { val stringBuilder StringBuilder() for (i in text.indices) { val c text[i] val index key.indexOf(c) if (index ! -1) { // 找到字符取密钥中的下一个字符 var nextIndex index 1 if (nextIndex key.length) { nextIndex 0 } stringBuilder.append(key[nextIndex]) } else { // 未在密钥中找到原样保留 stringBuilder.append(c) } } return stringBuilder.toString() } fun main(){ val str https://www.kk.vip; val str2 {\n \800021\:\https://www.aa.com\,\n \28\:\https://www.bb.club\,\n \30\:\https://www.cc.net\,\n \33\:\https://www.dd.net\,\n \32\:\https://www.ee.net\,\n \38\:\https://www.ff.fun\,\n \41\:\https://www.gg.club\,\n \42\:\https://www.hh.mobi\,\n \43\:\https://www.ii.com\\n \154\:\https://www.jj.vip\\n } val encodeStr encode2(str2) System.out.println(encodeStr) System.out.println(xxxxxxxxxxxxxxxxxxxxxxxxx) val key genKey(); System.out.println(key) System.out.println(xxxxxxxxxxxxxxxxxxxxxxxxx) val encodeStr2 encode(encodeStr,key); System.out.println(encodeStr2) System.out.println(xxxxxxxxxxxxxxxxxxxxxxxxx) val decodeStr1 decode(encodeStr2,key) System.out.println(decodeStr1) val decodeStr2 decode2(decodeStr1!!) System.out.println(decodeStr2) }