hkbak/imgdec.js

let 图片解密 = function(key,iv,kiType,mode) {
    function hexStringToBytes(cipherText) {
        cipherText = String(cipherText);
        let str = cipherText.toLowerCase();
        let length = str.length;
        let bArr = java.lang.reflect.Array.newInstance(java.lang.Byte.TYPE, length / 2);
        for (let i = 0, o = 0; i < length; i += 2, o++) {
            let a = str[i + 1],
                b = str[i];
            if (b != "0") {
                a = b + a;
            }
            let hexInt = java.lang.Integer.parseInt(new java.lang.String(a), 16);
            let inty = hexInt > 127 ? hexInt - 255 - 1 : hexInt;
            bArr[o] = inty;
        }
        return bArr;
    }
    let javaImport = new JavaImporter();
    javaImport.importPackage(
        Packages.com.example.hikerview.utils,
        Packages.java.lang,
        Packages.java.security,
        Packages.javax.crypto,
        Packages.javax.crypto.spec
    );
    with(javaImport) {
        function getBytes(str) {
            let bytes;
            if (kiType === "Base64") {
                bytes = _base64.decode(str, _base64.NO_WRAP);
            } else if (kiType === "Hex") {
                bytes = hexStringToBytes(str);
            } else {
                bytes = String(str).getBytes("UTF-8");
            }
            return bytes;
        }
        kiType = kiType || "String";
        mode = mode || 'AES/CBC/PKCS5Padding';
        key = getBytes(key);
        iv = getBytes(iv);
        function decryptData(cipherText) {
            let secretKeySpec = new SecretKeySpec(key, "AES");
            let ivParameterSpec = new IvParameterSpec(iv);
            let cipher = Cipher.getInstance(mode);
            cipher.init(2, secretKeySpec, ivParameterSpec);
            return cipher.doFinal(cipherText);
        }
        let bytes = FileUtil.toBytes(input);
        bytes = decryptData(bytes);
        return FileUtil.toInputStream(bytes);
    }
}