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crypt-to-multi.lua.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
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<title>Zenroom LUA</title>
<link rel="stylesheet" href="" type="text/css" />
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<h1>Zenroom</h1>
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<li><a href="../index.html">Index</a></li>
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<h2>Examples</h2>
<ul class="nowrap">
<li><a href="../examples/keygen.lua.html">keygen.lua</a></li>
<li><strong>crypt-to-multi.lua</strong></li>
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<h2>crypt-to-multi.lua</h2>
<pre>
<span class="comment">-- encrypt a secret to multiple recipients
</span>
<span class="comment">-- run with arguments:
</span><span class="comment">-- -a crypto-to-multi.data -k crypt-to-multi.keys
</span>
<span class="comment">-- inside KEYS is a list of names and public keys encoded with b58; it
</span><span class="comment">-- returns a list of recipients and encrypted secrets for each and the
</span><span class="comment">-- sender's public key
</span>
secret = str(DATA)
keys = JSON.decode(KEYS)
<span class="comment">-- this is our own secret key, combined with the recipient's public
</span><span class="comment">-- key to obtain a session key
</span><span class="keyword">local</span> private = url64(keys.keyring.secret)
res = {}
<span class="comment">-- loop through all recipients
</span><span class="keyword">for</span> name,pubkey <span class="keyword">in</span> <span class="global">pairs</span>(keys.recipients) <span class="keyword">do</span>
<span class="comment">-- calculate the session key
</span>
session = ECDH.session(private, url64(pubkey))
iv = O.random(<span class="number">32</span>)
out = { header = <span class="string">"encoded using zenroom "</span> .. VERSION.original}
<span class="comment">-- encrypt the message with the session key
</span> out.text, out.checksum =
ECDH.aead_encrypt(KDF(session), secret, iv, out.header)
<span class="comment">-- insert results in final json array
</span> res[name] = url64( JSON.encode(out) )
<span class="keyword">end</span>
<span class="comment">-- return the json array
</span><span class="global">print</span>(JSON.encode(res))</pre>
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<i style="float:right;">Last updated 2020-03-13 12:59:05 </i>
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