/**

 * AES加密

 * @param {*} word      当前有效参数

 * @param {*} keyStr    KEY值，加密的盐

 * @returns

 */
import CryptoJS from 'crypto-js';
export function encryptAES(word, keyStr) {
    keyStr = keyStr ? keyStr : 'Ryo7M3n8loC5Abcd'; //判断是否存在ksy，不存在就用定义好的key
    var key = CryptoJS.enc.Utf8.parse(keyStr);
    var viStr = key;//偏移量
    let srcs = CryptoJS.enc.Utf8.parse(word);
    let encrypted = CryptoJS.AES.encrypt(srcs, key, { iv: viStr, mode: CryptoJS.mode.ECB, padding: CryptoJS.pad.Pkcs7 });
    // var res = encrypted.ciphertext.toString();
    var res = encrypted.toString(); // base64
    return res;
}

/**

 * AES解密

 * @param {*} word      被AES加密后的字符串

 * @param {*} keyStr    KEY值，解密的盐

 * @returns

 */

export function decryptAES(word, keyStr) {

    // console.log('解密密文： word=',word);

    keyStr = keyStr ? keyStr : 'Ryo7M3n8loC5Abcd';

    var key = CryptoJS.enc.Utf8.parse(keyStr);

    var viStr = key;//偏移量

    let encryptedHexStr = CryptoJS.enc.Hex.parse(word);

    let srcs = CryptoJS.enc.Base64.stringify(encryptedHexStr);

    var decrypt = CryptoJS.AES.decrypt(srcs, key, { iv: viStr, mode: CryptoJS.mode.CBC, padding: CryptoJS.pad.Pkcs7 });

    var res = decrypt.toString(CryptoJS.enc.Utf8).toString();

    // console.log('解密结果 res=',res);

    return res;

    // return CryptoJS.enc.Utf8.stringify(decrypt).toString();

}

/**

 * 随机生成指定数量的16进制key

 * @param {*} num   指定KEY的位数

 * @returns

 */

export function generatekeyAES(num) {

    let library = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";

    let key = "";

    for (var i = 0; i < num; i++) {

        let randomPoz = Math.floor(Math.random() * library.length);

        key += library.substring(randomPoz, randomPoz + 1);

    }

    return key;
}