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New performance figures after PROGMEM changes

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Rhys Weatherley 2015-01-04 09:33:51 +10:00
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doc/crypto.dox
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@ -34,6 +34,8 @@
All cryptographic algorithms have been optimized for 8-bit Arduino platforms
like the Uno. Memory usage is also reduced, particularly for SHA1 and SHA256
which save 256 and 192 bytes respectively over traditional implementations.
For other algorithms, static sbox tables and the like are placed into
program memory to further reduce data memory usage.
ChaCha with 20 rounds and 256-bit keys is the recommended
symmetric encryption algorithm because it is twice as fast as AES128,
@ -51,15 +53,15 @@ All figures are for the Arduino Uno running at 16 MHz:
<table>
<tr><td>Algorithm</td><td>Encryption / Hashing (per byte)</td><td>Decryption (per byte)</td><td>Key Setup</td><td>State Size (bytes)</td></tr>
<tr><td>AES128 (ECB mode)</td><td align="right">32.27us</td><td align="right">65.85us</td><td align="right">158.74us</td><td align="right">208</td></tr>
<tr><td>AES192 (ECB mode)</td><td align="right">43.44us</td><td align="right">79.59us</td><td align="right">165.53us</td><td align="right">240</td></tr>
<tr><td>AES256 (ECB mode)</td><td align="right">50.62us</td><td align="right">92.34us</td><td align="right">225.58us</td><td align="right">272</td></tr>
<tr><td>AES128 (ECB mode)</td><td align="right">36.90us</td><td align="right">66.48us</td><td align="right">160.00us</td><td align="right">208</td></tr>
<tr><td>AES192 (ECB mode)</td><td align="right">44.20us</td><td align="right">80.35us</td><td align="right">166.54us</td><td align="right">240</td></tr>
<tr><td>AES256 (ECB mode)</td><td align="right">51.50us</td><td align="right">94.22us</td><td align="right">227.97us</td><td align="right">272</td></tr>
<tr><td>Arcfour</td><td align="right">2.98us</td><td align="right">2.98us</td><td align="right">601.34us</td><td align="right">258</td></tr>
<tr><td>ChaCha (20 rounds)</td><td align="right">14.87us</td><td align="right">14.88us</td><td align="right">39.88us</td><td align="right">130</td></tr>
<tr><td>ChaCha (12 rounds)</td><td align="right">10.38us</td><td align="right">10.38us</td><td align="right">39.88us</td><td align="right">130</td></tr>
<tr><td>ChaCha (8 rounds)</td><td align="right">8.13us</td><td align="right">8.14us</td><td align="right">39.88us</td><td align="right">130</td></tr>
<tr><td>ChaCha (20 rounds)</td><td align="right">14.87us</td><td align="right">14.88us</td><td align="right">43.74us</td><td align="right">130</td></tr>
<tr><td>ChaCha (12 rounds)</td><td align="right">10.38us</td><td align="right">10.38us</td><td align="right">43.74us</td><td align="right">130</td></tr>
<tr><td>ChaCha (8 rounds)</td><td align="right">8.13us</td><td align="right">8.14us</td><td align="right">43.74us</td><td align="right">130</td></tr>
<tr><td>SHA1</td><td align="right">21.90us</td><td> </td><td align="right"> </td><td align="right">94</td></tr>
<tr><td>SHA256</td><td align="right">42.89us</td><td> </td><td align="right"> </td><td align="right">106</td></tr>
<tr><td>SHA256</td><td align="right">43.85us</td><td> </td><td align="right"> </td><td align="right">106</td></tr>
</table>
Where a cipher supports more than one key size (such as ChaCha and Arcfour),