---
layout: post
---

<script src="/assets/js/aes.js"></script>
<script>
function getByteLen(val) {
    var len = 0;
    for (var i = 0; i < val.length; i++) {
        if (val[i].match(/[^\x00-\xff]/ig) != null) len += 3;
        else len += 1;
    }
    return len;
}

function onbtnDecrypto() {
    var encryptedData = "{{ content  | strip_html | strip_newlines }}";
    var keyword = document.getElementById("inputkey").value;

    if (keyword.replace(/(^\s*)|(\s*$)/g, "") == '') {
        alert("请输入密码！");
        return;
    }
    while (getByteLen(keyword) % 8 != 0) {
        keyword = keyword + "\0";
    }

    var key = CryptoJS.enc.Utf8.parse(keyword);
    var encryptedHexStr = CryptoJS.enc.Hex.parse(encryptedData);
    var encryptedBase64Str = CryptoJS.enc.Base64.stringify(encryptedHexStr);

    var decryptedData = CryptoJS.AES.decrypt(encryptedBase64Str, key, {
        mode: CryptoJS.mode.ECB,
        padding: CryptoJS.pad.Pkcs7
    });

    if (decryptedData.sigBytes < 0) {
        document.getElementById("output").innerHTML = "解密失败！密文或者key错误!";
        return;
    }
    try {
        decryptedData.toString(CryptoJS.enc.Utf8)
    } catch(e) {
        document.getElementById("output").innerHTML = "解密失败！密文或者key错误!";
        return;
    }
    var decryptedStr = decryptedData.toString(CryptoJS.enc.Utf8);
    document.getElementById("output").innerHTML = decryptedStr;
    document.getElementById("pwinput").style.display = "none";
}
</script>
<div id="pwinput">{{ page.tips | default: "请输入密码:" }}<br />
   <input id="inputkey" type="password" /> <button onclick="onbtnDecrypto()">解密</button>
</div>
<div id="output"></div>  <br />
