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Refactor the low-memory versions of Speck
Rename SpeckLowMemory to SpeckTiny for the encrypt-only version. SpeckSmall for the version that supports both encryption and decryption.
This commit is contained in:
Rhys Weatherley
@@ -50,8 +50,8 @@ is desirable.
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If code size is an issue for your application (for example on very low end
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Arduino variants), then Speck on AVR is less than half the code size of
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ChaCha, at the cost of more data memory for the state and longer key
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setup times. The SpeckLowMemory class is even smaller at the cost of
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some performance when encrypting.
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setup times. The SpeckTiny and SpeckSmall classes are even smaller at
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the cost of some performance when encrypting.
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BLAKE2s and BLAKE2b are variations on the ChaCha stream cipher, designed for
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hashing, with 256-bit and 512-bit hash outputs respectively. They are
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@@ -80,9 +80,12 @@ Ardunino Mega 2560 running at 16 MHz are similar:
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<tr><td>Speck (128-bit key, ECB mode)</td><td align="right">10.72us</td><td align="right">11.09us</td><td align="right">287.02us</td><td align="right">275</td></tr>
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<tr><td>Speck (192-bit key, ECB mode)</td><td align="right">11.03us</td><td align="right">11.42us</td><td align="right">298.21us</td><td align="right">275</td></tr>
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<tr><td>Speck (256-bit key, ECB mode)</td><td align="right">11.35us</td><td align="right">11.74us</td><td align="right">309.66us</td><td align="right">275</td></tr>
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<tr><td>SpeckLowMemory (128-bit key, ECB mode)</td><td align="right">35.25us</td><td align="right"> </td><td align="right">10.22us</td><td align="right">35</td></tr>
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<tr><td>SpeckLowMemory (192-bit key, ECB mode)</td><td align="right">36.56us</td><td align="right"> </td><td align="right">13.62us</td><td align="right">35</td></tr>
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<tr><td>SpeckLowMemory (256-bit key, ECB mode)</td><td align="right">37.87us</td><td align="right"> </td><td align="right">16.89us</td><td align="right">35</td></tr>
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<tr><td>SpeckSmall (128-bit key, ECB mode)</td><td align="right">35.25us</td><td align="right">36.46us</td><td align="right">207.66us</td><td align="right">67</td></tr>
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<tr><td>SpeckSmall (192-bit key, ECB mode)</td><td align="right">36.56us</td><td align="right">37.56us</td><td align="right">220.55us</td><td align="right">67</td></tr>
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<tr><td>SpeckSmall (256-bit key, ECB mode)</td><td align="right">37.87us</td><td align="right">38.67us</td><td align="right">233.32us</td><td align="right">67</td></tr>
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<tr><td>SpeckTiny (128-bit key, ECB mode)</td><td align="right">35.25us</td><td align="right"> </td><td align="right">10.22us</td><td align="right">35</td></tr>
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<tr><td>SpeckTiny (192-bit key, ECB mode)</td><td align="right">36.56us</td><td align="right"> </td><td align="right">13.62us</td><td align="right">35</td></tr>
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<tr><td>SpeckTiny (256-bit key, ECB mode)</td><td align="right">37.87us</td><td align="right"> </td><td align="right">16.89us</td><td align="right">35</td></tr>
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<tr><td colspan="5"> </td></tr>
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<tr><td>AEAD Algorithm</td><td align="right">Encryption (per byte)</td><td align="right">Decryption (per byte)</td><td>Key Setup</td><td>State Size (bytes)</td></tr>
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<tr><td>ChaChaPoly</td><td align="right">41.20us</td><td align="right">41.19us</td><td align="right">902.36us</td><td align="right">221</td></tr>
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@@ -90,11 +93,11 @@ Ardunino Mega 2560 running at 16 MHz are similar:
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<tr><td>GCM<AES192></td><td align="right">116.38us</td><td align="right">115.92us</td><td align="right">1485.56us</td><td align="right">316</td></tr>
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<tr><td>GCM<AES256></td><td align="right">123.04us</td><td align="right">122.59us</td><td align="right">1760.28us</td><td align="right">348</td></tr>
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<tr><td>GCM<Speck> (256-bit key)</td><td align="right">87.78us</td><td align="right">87.32us</td><td align="right">714.41us</td><td align="right">378</td></tr>
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<tr><td>GCM<SpeckLowMemory> (256-bit key)</td><td align="right">114.30us</td><td align="right">113.84us</td><td align="right">1270.32us</td><td align="right">138</td></tr>
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<tr><td>GCM<SpeckTiny> (256-bit key)</td><td align="right">114.30us</td><td align="right">113.84us</td><td align="right">1270.32us</td><td align="right">138</td></tr>
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<tr><td>EAX<AES128></td><td align="right">71.14us</td><td align="right">71.14us</td><td align="right">1311.97us</td><td align="right">268</td></tr>
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<tr><td>EAX<AES256></td><td align="right">97.80us</td><td align="right">97.80us</td><td align="right">1806.57us</td><td align="right">332</td></tr>
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<tr><td>EAX<Speck> (256-bit key)</td><td align="right">27.27us</td><td align="right">27.26us</td><td align="right">760.74us</td><td align="right">362</td></tr>
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<tr><td>EAX<SpeckLowMemory> (256-bit key)</td><td align="right">80.31us</td><td align="right">80.31us</td><td align="right">1316.60us</td><td align="right">122</td></tr>
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<tr><td>EAX<SpeckTiny> (256-bit key)</td><td align="right">80.31us</td><td align="right">80.31us</td><td align="right">1316.60us</td><td align="right">122</td></tr>
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<tr><td colspan="5"> </td></tr>
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<tr><td>Hash Algorithm</td><td align="right">Hashing (per byte)</td><td align="right">Finalization</td><td> </td><td>State Size (bytes)</td></tr>
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<tr><td>SHA256</td><td align="right">43.85us</td><td align="right">2841.04us</td><td align="right"> </td><td align="right">107</td></tr>
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@@ -138,9 +141,12 @@ All figures are for the Arduino Due running at 84 MHz:
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<tr><td>Speck (128-bit key, ECB mode)</td><td align="right">0.97us</td><td align="right">0.96us</td><td align="right">36.80us</td><td align="right">288</td></tr>
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<tr><td>Speck (192-bit key, ECB mode)</td><td align="right">1.00us</td><td align="right">0.98us</td><td align="right">38.14us</td><td align="right">288</td></tr>
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<tr><td>Speck (256-bit key, ECB mode)</td><td align="right">1.03us</td><td align="right">1.01us</td><td align="right">39.31us</td><td align="right">288</td></tr>
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<tr><td>SpeckLowMemory (128-bit key, ECB mode)</td><td align="right">2.72us</td><td align="right"> </td><td align="right">1.47us</td><td align="right">48</td></tr>
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<tr><td>SpeckLowMemory (192-bit key, ECB mode)</td><td align="right">2.81us</td><td align="right"> </td><td align="right">1.54us</td><td align="right">48</td></tr>
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<tr><td>SpeckLowMemory (256-bit key, ECB mode)</td><td align="right">2.90us</td><td align="right"> </td><td align="right">1.83us</td><td align="right">48</td></tr>
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<tr><td>SpeckSmall (128-bit key, ECB mode)</td><td align="right">2.72us</td><td align="right">2.30us</td><td align="right">26.89us</td><td align="right">80</td></tr>
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<tr><td>SpeckSmall (192-bit key, ECB mode)</td><td align="right">2.80us</td><td align="right">2.39us</td><td align="right">27.80us</td><td align="right">80</td></tr>
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<tr><td>SpeckSmall (256-bit key, ECB mode)</td><td align="right">2.90us</td><td align="right">2.48us</td><td align="right">29.08us</td><td align="right">80</td></tr>
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<tr><td>SpeckTiny (128-bit key, ECB mode)</td><td align="right">2.72us</td><td align="right"> </td><td align="right">1.47us</td><td align="right">48</td></tr>
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<tr><td>SpeckTiny (192-bit key, ECB mode)</td><td align="right">2.81us</td><td align="right"> </td><td align="right">1.54us</td><td align="right">48</td></tr>
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<tr><td>SpeckTiny (256-bit key, ECB mode)</td><td align="right">2.90us</td><td align="right"> </td><td align="right">1.83us</td><td align="right">48</td></tr>
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<tr><td colspan="5"> </td></tr>
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<tr><td>AEAD Algorithm</td><td align="right">Encryption (per byte)</td><td align="right">Decryption (per byte)</td><td>Key Setup</td><td>State Size (bytes)</td></tr>
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<tr><td>ChaChaPoly</td><td align="right">1.71us</td><td align="right">1.71us</td><td align="right">45.08us</td><td align="right">240</td></tr>
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@@ -148,11 +154,11 @@ All figures are for the Arduino Due running at 84 MHz:
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<tr><td>GCM<AES192></td><td align="right">12.30us</td><td align="right">12.31us</td><td align="right">296.83us</td><td align="right">344</td></tr>
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<tr><td>GCM<AES256></td><td align="right">13.66us</td><td align="right">13.67us</td><td align="right">350.25us</td><td align="right">376</td></tr>
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<tr><td>GCM<Speck> (256-bit key)</td><td align="right">5.27us</td><td align="right">5.28us</td><td align="right">75.31us</td><td align="right">408</td></tr>
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<tr><td>GCM<SpeckLowMemory> (256-bit key)</td><td align="right">7.06us</td><td align="right">7.07us</td><td align="right">94.20us</td><td align="right">168</td></tr>
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<tr><td>GCM<SpeckTiny> (256-bit key)</td><td align="right">7.06us</td><td align="right">7.07us</td><td align="right">94.20us</td><td align="right">168</td></tr>
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<tr><td>EAX<AES128></td><td align="right">12.33us</td><td align="right">12.33us</td><td align="right">234.91us</td><td align="right">280</td></tr>
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<tr><td>EAX<AES256></td><td align="right">16.99us</td><td align="right">16.99us</td><td align="right">322.92us</td><td align="right">344</td></tr>
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<tr><td>EAX<Speck> (256-bit key)</td><td align="right">2.80us</td><td align="right">2.80us</td><td align="right">81.63us</td><td align="right">384</td></tr>
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<tr><td>EAX<SpeckLowMemory> (256-bit key)</td><td align="right">6.69us</td><td align="right">6.69us</td><td align="right">110.91us</td><td align="right">144</td></tr>
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<tr><td>EAX<SpeckTiny> (256-bit key)</td><td align="right">6.69us</td><td align="right">6.69us</td><td align="right">110.91us</td><td align="right">144</td></tr>
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<tr><td colspan="5"> </td></tr>
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<tr><td>Hash Algorithm</td><td align="right">Hashing (per byte)</td><td align="right">Finalization</td><td> </td><td>State Size (bytes)</td></tr>
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<tr><td>SHA256</td><td align="right">1.15us</td><td align="right">76.60us</td><td align="right"> </td><td align="right">120</td></tr>
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