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Encrypt & Decrypt Message
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<h1 id="encrypt--decrypt-message-using-nacl">Encrypt &amp; Decrypt Message using NaCl</h1>
<p>The following example shows how to encrypt and decrypt a message with NaCl (pronouced &quot;salt&quot;), which is a Networking and Cryptography library used in util-crypto.</p>
<pre><code class="lang-javascript"><div class="sunlight-container sunlight-theme-gitbook"><div class="sunlight-code-container"><pre class="sunlight-highlight-javascript sunlight-highlighted"><span class="sunlight-javascript"><span class="sunlight-reservedWord">const</span>&#xA0;<span class="sunlight-punctuation">{</span>&#xA0;<span class="sunlight-ident">naclEncrypt</span><span class="sunlight-punctuation">,</span>&#xA0;<span class="sunlight-ident">naclDecrypt</span>&#xA0;<span class="sunlight-punctuation">}</span>&#xA0;<span class="sunlight-operator">=</span>&#xA0;<span class="sunlight-ident">require</span><span class="sunlight-punctuation">(</span><span class="sunlight-string">&apos;@polkadot/util-crypto&apos;</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
<span class="sunlight-ident">async</span>&#xA0;<span class="sunlight-keyword">function</span>&#xA0;<span class="sunlight-named-ident">main</span>&#xA0;<span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">)</span>&#xA0;<span class="sunlight-punctuation">{</span>
&#xA0;&#xA0;<span class="sunlight-reservedWord">const</span>&#xA0;<span class="sunlight-ident">secret</span>&#xA0;<span class="sunlight-operator">=</span>&#xA0;<span class="sunlight-keyword">new</span>&#xA0;<span class="sunlight-ident">Uint8Array</span><span class="sunlight-punctuation">(</span><span class="sunlight-number">32</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
&#xA0;&#xA0;<span class="sunlight-reservedWord">const</span>&#xA0;<span class="sunlight-ident">messagePreEncryption</span>&#xA0;<span class="sunlight-operator">=</span>&#xA0;<span class="sunlight-keyword">new</span>&#xA0;<span class="sunlight-ident">Uint8Array</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">[</span><span class="sunlight-number">1</span><span class="sunlight-punctuation">,</span>&#xA0;<span class="sunlight-number">2</span><span class="sunlight-punctuation">,</span>&#xA0;<span class="sunlight-number">3</span><span class="sunlight-punctuation">,</span>&#xA0;<span class="sunlight-number">4</span><span class="sunlight-punctuation">,</span>&#xA0;<span class="sunlight-number">5</span><span class="sunlight-punctuation">,</span>&#xA0;<span class="sunlight-number">4</span><span class="sunlight-punctuation">,</span>&#xA0;<span class="sunlight-number">3</span><span class="sunlight-punctuation">,</span>&#xA0;<span class="sunlight-number">2</span><span class="sunlight-punctuation">,</span>&#xA0;<span class="sunlight-number">1</span><span class="sunlight-punctuation">]</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
&#xA0;&#xA0;<span class="sunlight-reservedWord">const</span>&#xA0;<span class="sunlight-ident">noncePreEncryption</span>&#xA0;<span class="sunlight-operator">=</span>&#xA0;<span class="sunlight-keyword">new</span>&#xA0;<span class="sunlight-ident">Uint8Array</span><span class="sunlight-punctuation">(</span><span class="sunlight-number">24</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
&#xA0;&#xA0;<span class="sunlight-comment">//&#xA0;Encrypt&#xA0;the&#xA0;message</span>
&#xA0;&#xA0;<span class="sunlight-reservedWord">const</span>&#xA0;<span class="sunlight-punctuation">{</span>&#xA0;<span class="sunlight-ident">encrypted</span><span class="sunlight-punctuation">,</span>&#xA0;<span class="sunlight-ident">nonce</span>&#xA0;<span class="sunlight-punctuation">}</span>&#xA0;<span class="sunlight-operator">=</span>&#xA0;<span class="sunlight-ident">naclEncrypt</span><span class="sunlight-punctuation">(</span><span class="sunlight-ident">messagePreEncryption</span><span class="sunlight-punctuation">,</span>&#xA0;<span class="sunlight-ident">secret</span><span class="sunlight-punctuation">,</span>&#xA0;<span class="sunlight-ident">noncePreEncryption</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
&#xA0;&#xA0;<span class="sunlight-comment">//&#xA0;Show&#xA0;contents&#xA0;of&#xA0;the&#xA0;encrypted&#xA0;message</span>
&#xA0;&#xA0;<span class="sunlight-ident">console</span><span class="sunlight-operator">.</span><span class="sunlight-ident">log</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">`</span><span class="sunlight-ident">Encrypted</span>&#xA0;<span class="sunlight-ident">message</span><span class="sunlight-operator">:</span>&#xA0;<span class="sunlight-ident">$</span><span class="sunlight-punctuation">{</span><span class="sunlight-globalObject">JSON</span><span class="sunlight-operator">.</span><span class="sunlight-ident">stringify</span><span class="sunlight-punctuation">(</span><span class="sunlight-ident">encrypted</span><span class="sunlight-punctuation">,</span>&#xA0;<span class="sunlight-keyword">null</span><span class="sunlight-punctuation">,</span>&#xA0;<span class="sunlight-number">2</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">}</span><span class="sunlight-punctuation">`</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
&#xA0;&#xA0;<span class="sunlight-comment">//&#xA0;Decrypt&#xA0;the&#xA0;message</span>
&#xA0;&#xA0;<span class="sunlight-reservedWord">const</span>&#xA0;<span class="sunlight-ident">messageDecrypted</span>&#xA0;<span class="sunlight-operator">=</span>&#xA0;<span class="sunlight-ident">naclDecrypt</span><span class="sunlight-punctuation">(</span><span class="sunlight-ident">encrypted</span><span class="sunlight-punctuation">,</span>&#xA0;<span class="sunlight-ident">nonce</span><span class="sunlight-punctuation">,</span>&#xA0;<span class="sunlight-ident">secret</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
&#xA0;&#xA0;<span class="sunlight-comment">//&#xA0;Convert&#xA0;each&#xA0;Uint8Array&#xA0;to&#xA0;a&#xA0;string&#xA0;for&#xA0;comparison</span>
&#xA0;&#xA0;<span class="sunlight-reservedWord">const</span>&#xA0;<span class="sunlight-ident">isMatch</span>&#xA0;<span class="sunlight-operator">=</span>&#xA0;<span class="sunlight-ident">messagePreEncryption</span><span class="sunlight-operator">.</span><span class="sunlight-ident">toString</span>&#xA0;<span class="sunlight-operator">===</span>&#xA0;<span class="sunlight-ident">messageDecrypted</span><span class="sunlight-operator">.</span><span class="sunlight-ident">toString</span><span class="sunlight-punctuation">;</span>
&#xA0;&#xA0;<span class="sunlight-comment">//&#xA0;Verify&#xA0;that&#xA0;the&#xA0;decrypted&#xA0;message&#xA0;matches&#xA0;the&#xA0;original&#xA0;message</span>
&#xA0;&#xA0;<span class="sunlight-ident">console</span><span class="sunlight-operator">.</span><span class="sunlight-ident">log</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">`</span><span class="sunlight-ident">Does</span>&#xA0;<span class="sunlight-ident">the</span>&#xA0;<span class="sunlight-ident">decrypted</span>&#xA0;<span class="sunlight-ident">message</span>&#xA0;<span class="sunlight-ident">match</span>&#xA0;<span class="sunlight-ident">the</span>&#xA0;<span class="sunlight-ident">original</span>&#xA0;<span class="sunlight-ident">message</span><span class="sunlight-operator">?</span>&#xA0;<span class="sunlight-ident">$</span><span class="sunlight-punctuation">{</span><span class="sunlight-ident">isMatch</span><span class="sunlight-punctuation">}</span><span class="sunlight-punctuation">`</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
<span class="sunlight-punctuation">}</span>
<span class="sunlight-ident">main</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">)</span><span class="sunlight-operator">.</span><span class="sunlight-keyword">catch</span><span class="sunlight-punctuation">(</span><span class="sunlight-ident">console</span><span class="sunlight-operator">.</span><span class="sunlight-ident">error</span><span class="sunlight-punctuation">)</span><span class="sunlight-operator">.</span><span class="sunlight-keyword">finally</span><span class="sunlight-punctuation">(</span><span class="sunlight-ident">_</span>&#xA0;<span class="sunlight-operator">=</span><span class="sunlight-operator">&gt;</span>&#xA0;<span class="sunlight-ident">process</span><span class="sunlight-operator">.</span><span class="sunlight-ident">exit</span><span class="sunlight-punctuation">(</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
</span></pre></div></div></code></pre>
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