ExtendscriptでMD5なんか…

今月は短いのですが既に1/3近くが経過しています。きっと皆様多忙でしょう。こんな時に何ですが、全く役に立たないものを流しておきましょう。
Extendscriptでスクリプトを作成して配布等を行う場合、必須のユーザー管理などが結構手間になります。それはExtension等でも同じことで、特に販売する物等に関しては意図しない拡散を防ぐためにDRMの実装が必須となります。
そこで必要なのがユーザー個々の識別で、これについてはExtendscriptをりようすると幾つかの個人情報が得られるのですが、それをそのまんまネット経由でDRMサーバー等に流すという暴挙は絶対にやってはいけないことです。
そこで、その個人情報を基にした情報を作ってHTTPS等の暗号化した通信経由で流すことを考える必要があるわけです。

今回のものは一般にはなじまないものです。主にCoderの方が参考にするものです。実際にわたしが利用するコードは掲載しませんが、DRM実装等で欲しい方はご連絡下さい。
今回はベースになる技術の解説だけやっておきましょう。

function MD5(str){
    var sc= “@JSXBIN@ES@2.0@MyBbyBnABMAbyBn0ACJAnABjzEjEjHjTjUBfWzGiPjCjKjFjDjUChAzBjHDAREFdH”
        + “FdMFdRFdWfzBjIEAREFdFFdJFdOFdUfzBjJFAREFdEFdLFdQFdXfzBjKGAREFdGFdKFdPFdVfzBiSHA”
        + “RiAFdkAFdAFdAFdAFdAFdAFdAFdAFdAFdAFdAFdAFdAFdAFdAFdAFdAFdAFdAFdAFdAFdAFdAFdAFdA”
        + “FdAFdAFdAFdAFdAFdAFdAFdAFdAFdAFdAFdAFdAFdAFdAFdAFdAFdAFdAFdAFdAFdAFdAFdAFdAFdAF”
        + “dAFdAFdAFdAFdAFdAFdAFdAFdAFdAFdAFdAFdAfzBjTIAnzBiGJAnzBjMKAnzBjWLAnzBiEMAnzBiMN”
        + “NyBnAMAbyBn0ABZAnAEXzBiBOfezEjUjIjJjTPfRCEXzBjNQfePfRCVzBjFRfAVDfBffEXQfePfRCCz”
        + “BhGSEXzBjXTfePfRBVRfAffnnd80AnAnfnfnfnPiBVzBjBUfCffffADD4B0AhAR40BhAU4C0AhAD0Az”
        + “AVCAzBiOWNyBnAMAbyBn0ABZAnABjzDjBjOjTXfEXOfePfRCEXQfePfRCVRfAVUfCffEXQfePfRCVDf”
        + “BCSEXTfePfRBVUfCffnnd80AnAnfnfnfnPiBffffnfADD4B0AhAR40BhAU4C0AhAD0AVCAzBiPYNyBn”
        + “AMAbyBn0ABZAnAEXzBiCZfePfRCEXZfePfRCVRfAVDfBffVUfCffADD4B0AhAR40BhAU4C0AhAD0AVC”
        + “AzBiQgaNyBnAMAbyBn0ABZAnAEXZfePfRCVDfBEXOfePfRCVRfACSEXTfePfRBVUfCffnnd80AnAnfn”
        + “fnfnPiBffffADD4B0AhAR40BhAU4C0AhAD0AVCAzBjVgbNyBnAMAbyBn0ABZBnACzBhLgcCzBhFgdCz”
        + “BhKgeVRfAEXzDjQjPjXgffjzEiNjBjUjIhAfRCFdCVDfBffnnnnd80EnQiBEXzFjGjMjPjPjShBfjhA”
        + “fRBCzBhPhCVRfAEXgffjhAfRCFdCCzBhNhDnVDfBdhAnffnnffnnACD4B0AhAR40BhAC0AVCBUNyBnA”
        + “MBbyBn0ABZBnACgdCgcEXgbfePfRCCgdCgcCgcCgcVRfAEXNfePfRDVDfBVUfCVzBjChEfDffnnVzBj”
        + “DhFfEnnVzBjGhGfGnnnnd80EnQiBVzBjEhHfFffVDfBnnnnd80EnQiBAHhG4G0AhAD4B0AhAhH4F0Ah”
        + “AR40BhAU4C0AhAhE4D0AhAhF4E0AhAH0AVCBhENyBnAMBbyBn0ABZBnACgdCgcEXgbfePfRCCgdCgcC”
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        + “ZBnACgdCgcEXgbfePfRCCgdCgcCgcCgcVRfAEXYfePfRDVDfBVUfCVhEfDffnnVhFfEnnVhGfGnnnnd”
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        + “E0AhAH0AVCBhGNyBnAMBbyBn0ABZBnACgdCgcEXgbfePfRCCgdCgcCgcCgcVRfAEXgafePfRDVDfBVU”
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        + “hFCEXhEfePfRHVhFfCVhHfDVUfAVhEfBXhffVhGfEXhUfXEfePfFd4iRiaiehGffnffJyEnAShEBEXh”
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       &n
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        + “XzGjDjIjBjSiBjUiGfVDfARBVUfBffnffdCzChdhdiHnVRfFeBhFnRDSRFCgcEXiGfVDfARBCgcVUfB”
        + “nndBffEXiGfVDfARBCgcVUfBnndCffnnnffSUBCgcnnndCntfSRFEjzIjQjBjSjTjFiJjOjUiIfRCVR”
        + “fFFdQffnfftRCShFDEXzHjJjOjEjFjYiPjGiJfFeiehBhChDhEhFhGhHhIhJhKhLhMhNhOhPhQhRhSh”
        + “ThUhVhWhXhYhZhahbhchdhehfiAiBiCiDiEiFiGiHiIiJiKiLiMiNiOiPiQiRiSiTiUiViWiXiYiZia”
        + “ibiBidieifiBjBjCjDjEjFjGjHjIjJjKjLjMjNjOjPjQjRjSjTjUjVjWjXjYjZjajbjcjdjeRCVRfFF”
        + “dAffnffdChTnVhFfDdAnShHEndBffSRFCgcnVhFfDdhBnnfftCiHnVhHfEdAntDyJnAVtAVUfBAXzGj”
        + “MjFjOjHjUjIiKfVDfAByBhLOyJKyJbyKn0ADJKnASRFCgcnEXzIjUjPiTjUjSjJjOjHiLfQVfXJfePf”
        + “VUfBRBFdQffeBhQnnffJyKnASRFEXzJjTjVjCjTjUjSjJjOjHiMfVRfFRCChDXiKfVRfFnndCXiKfVR”
        + “fFffnffJyKnAShECCgcnVRfFnnntfAREEXhIfePfRCXIfePfXiKfXIfePfffEXhRfePfnfShECneAff”
        + “SUBndAfftChTnVUfBdQnTUBBtACiHnVhHfEdAnJKnAShECneAffZKnAVhEfCAGD40BiAhH4E0AiAR40”
        + “BhAU4B0AiAhE4C0AiAhF4D0AiABFAVCKTNyBnAMKbyBn0ABZKnAEXzBjPiNfePfRCCShzBjeiOCSVRf”
        + “Annd2nfnfnnd2nfnfCShiOCSChNVRfAnndQnnd2nfnfnnd2nfnfffABR40BhAB0AVCKONyBnAMKbyBn”
        + “0ABZKnAEXiNfePfRCCSCSCzBjciPCSVRfAnnd2nfnfVDfBnnnnd2nfnfnnd2nfnfCSCSCiPCSChNVRf”
        + “AnndQnnd2nfnfChNVDfBnndQnnnnd2nfnfnnd2nfnfffACD4B0AhAR40BhAC0AVCKQNyBnAMKbyBn0A”
        + “BZKnAEXiNfePfRCCSCSCSVRfAnnd2nfnfVDfBnnnnd2nfnfCSCSCSChN
VRfAnndQnnd2nfnfChNVDfB”
        + “nndQnnnnd2nfnfffACD4B0AhAR40BhAC0AVCKZNyBnAMKbyBn0ABZKnAEXiNfePfRCCSCSCzBieiQCS”
        + “VRfAnnd2nfnfVDfBnnnnd2nfnfnnd2nfnfCSCSCiQCSChNVRfAnndQnnd2nfnfChNVDfBnndQnnnnd2”
        + “nfnfnnd2nfnfffACD4B0AhAR40BhAC0AVCKiNNyBnAMKbyBn0ABZKnACgcVRfACgenVDfBd40ABAnnn”
        + “ACD4B0AhAR40BhAC0AVCKzEjIjBjTjIiRNyBnAMKbyBn0ABZKnAEXiEfePfRBVzDjTjUjSiSfAffABi”
        + “S40BhAB0AVCKnfZKnAEXiRfjBfRBViSfAffABiS40BhAB0AzGjHjFjUiNiEhViTAK0EVByB”;
        eval(sc);
    return getMD5(str);
    }

はい、こちらがMD5ダイジェストを生成するファンクションです。中の関数は解析の難易度を上げるためにバイナリ書き出しを行ったものをevalすることにより実行します。この様にExtendscriptでは見せたくない関数のみをjsxbinにする事が可能です。
腕に自信のある方は解析を行ってみてください。バイナリ化されたスクリプトを戻せても元のスクリプトもある程度構造が読みにくくなっています。
そうそう、AddOnsですが全く音沙汰なしというwそんなに複雑な動きをするものではありません。まあ、中身はかなり複雑なんですが、さっさと検証済ませてほしいものです。

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