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Low memory version of Speck that combines key schedule with encryption

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Rhys Weatherley
2015-12-17 19:06:41 +10:00
parent 32d3d59cfb
commit e046533aff
5 changed files with 644 additions and 23 deletions
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21
doc/crypto.dox
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@@ -50,7 +50,8 @@ is desirable.
If code size is an issue for your application (for example on very low end
Arduino variants), then Speck on AVR is less than half the code size of
ChaCha, at the cost of more data memory for the state and longer key
setup times.
setup times. The SpeckLowMemory class is even smaller at the cost of
some performance when encrypting.
BLAKE2s and BLAKE2b are variations on the ChaCha stream cipher, designed for
hashing, with 256-bit and 512-bit hash outputs respectively. They are
@@ -76,9 +77,12 @@ Ardunino Mega 2560 running at 16 MHz are similar:
<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">132</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">132</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">132</td></tr>
<tr><td>Speck (128-bit key, ECB mode)</td><td align="right">10.72us</td><td align="right">11.09us</td><td align="right">304.56us</td><td align="right">275</td></tr>
<tr><td>Speck (192-bit key, ECB mode)</td><td align="right">11.03us</td><td align="right">11.42us</td><td align="right">316.32us</td><td align="right">275</td></tr>
<tr><td>Speck (256-bit key, ECB mode)</td><td align="right">11.35us</td><td align="right">11.74us</td><td align="right">328.33us</td><td align="right">275</td></tr>
<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>
<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>
<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>
<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>
<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>
<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>
<tr><td colspan="5"> </td></tr>
<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>
<tr><td>ChaChaPoly</td><td align="right">41.23us</td><td align="right">41.23us</td><td align="right">902.55us</td><td align="right">255</td></tr>
@@ -127,9 +131,12 @@ All figures are for the Arduino Due running at 84 MHz:
<tr><td>ChaCha (20 rounds)</td><td align="right">0.87us</td><td align="right">0.88us</td><td align="right">4.96us</td><td align="right">136</td></tr>
<tr><td>ChaCha (12 rounds)</td><td align="right">0.70us</td><td align="right">0.71us</td><td align="right">4.96us</td><td align="right">136</td></tr>
<tr><td>ChaCha (8 rounds)</td><td align="right">0.62us</td><td align="right">0.62us</td><td align="right">4.96us</td><td align="right">136</td></tr>
<tr><td>Speck (128-bit key, ECB mode)</td><td align="right">0.88us</td><td align="right">1.17us</td><td align="right">37.54us</td><td align="right">288</td></tr>
<tr><td>Speck (192-bit key, ECB mode)</td><td align="right">0.90us</td><td align="right">1.20us</td><td align="right">38.92us</td><td align="right">288</td></tr>
<tr><td>Speck (256-bit key, ECB mode)</td><td align="right">0.93us</td><td align="right">1.23us</td><td align="right">40.10us</td><td align="right">288</td></tr>
<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>
<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>
<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>
<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>
<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>
<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>
<tr><td colspan="5"> </td></tr>
<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>
<tr><td>ChaChaPoly</td><td align="right">1.66us</td><td align="right">1.66us</td><td align="right">45.02us</td><td align="right">280</td></tr>