<p>情報が分散していたのでメモ。</p>
<h2 id="windows">
<a class="header-anchor-link" href="#windows" aria-hidden="true"></a> Windows</h2>
<div class="code-block-container">
<div class="code-block-filename-container"><span class="code-block-filename"> encode</span></div>
<pre class="language-terminal"><code class="language-terminal">certutil -f -encodehex SRC_FILE BASE64_FILE 0x40000001
</code></pre>
</div><p><code>-encode</code> だと、<code>BEGIN CERTIFICATE</code> など不要なヘッダフッタや改行が入ってしまう。<br>
<code>-encodehex</code> はヘルプに載っていない undocumented verb らしいので仕様変更に注意↓<br style="display:none">
<span class="embed-block zenn-embedded zenn-embedded-card"><iframe id="zenn-embedded__e903f94b45a29" src="https://embed.zenn.studio/card#zenn-embedded__e903f94b45a29" data-content="https%3A%2F%2Fstackoverflow.com%2Fquestions%2F60389507%2Fcmd-batch-encode-file-to-base-64-and-trim-characters-and-new-line" frameborder="0" scrolling="no" loading="lazy"></iframe></span><a href="https://stackoverflow.com/questions/60389507/cmd-batch-encode-file-to-base-64-and-trim-characters-and-new-line" style="display:none" target="_blank" rel="nofollow noopener noreferrer">https://stackoverflow.com/questions/60389507/cmd-batch-encode-file-to-base-64-and-trim-characters-and-new-line</a></p>
<div class="code-block-container">
<div class="code-block-filename-container"><span class="code-block-filename"> decode</span></div>
<pre class="language-terminal"><code class="language-terminal">certutil -f -decode BASE64_FILE DECODED_FILE
</code></pre>
</div><h2 id="linux">
<a class="header-anchor-link" href="#linux" aria-hidden="true"></a> Linux</h2>
<div class="code-block-container">
<div class="code-block-filename-container"><span class="code-block-filename"> encode</span></div>
<pre class="language-bash"><code class="language-bash">base64 <span class="token parameter variable">-w</span> <span class="token number">0</span> SRC_FILE <span class="token operator">&gt;</span> BASE64_FILE
</code></pre>
</div><div class="code-block-container">
<div class="code-block-filename-container"><span class="code-block-filename"> decode</span></div>
<pre class="language-bash"><code class="language-bash">base64 <span class="token parameter variable">-d</span> BASE64_FILE <span class="token operator">&gt;</span> DECODED_FILE
</code></pre>
</div>

コマンドラインで Base64 encode/decode

Windows

Linux

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