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AES tiny and small memory versions

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Rhys Weatherley
2018-04-07 02:39:30 +10:00
parent bb9f0c2b96
commit 9ae79f469f
9 changed files with 1002 additions and 20 deletions
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doc/crypto.dox
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@@ -37,6 +37,18 @@
\li Post-quantum algorithms: NewHope
\li Random number generation: \link RNGClass RNG\endlink, TransistorNoiseSource, RingOscillatorNoiseSource
Reduced memory versions of some algorithms (encryption is slower, but the
RAM required for the key schedule is less):
\li AESTiny128, AESSmall128, AESTiny256, AESSmall256
\li SpeckTiny, SpeckSmall
The "tiny" versions only support encryption which makes them suitable for
the CTR, CFB, OFB, EAX, and GCM block cipher modes but not CBC. The "small"
versions use a little more memory but support both encryptionm and decryption.
\section crypto_optimizations Optimizations
All cryptographic algorithms have been optimized for 8-bit Arduino platforms
like the Uno. Memory usage is also reduced, particularly for SHA256
and SHA512 which save 192 and 512 bytes respectively over traditional
@@ -76,9 +88,13 @@ Ardunino Mega 2560 running at 16 MHz are similar:
<table>
<tr><td>Encryption Algorithm</td><td align="right">Encryption (per byte)</td><td align="right">Decryption (per byte)</td><td align="right">Key Setup</td><td>State Size (bytes)</td></tr>
<tr><td>AES128 (ECB mode)</td><td align="right">33.28us</td><td align="right">63.18us</td><td align="right">160.00us</td><td align="right">181</td></tr>
<tr><td>AES192 (ECB mode)</td><td align="right">39.94us</td><td align="right">76.48us</td><td align="right">166.54us</td><td align="right">213</td></tr>
<tr><td>AES256 (ECB mode)</td><td align="right">46.61us</td><td align="right">89.78us</td><td align="right">227.97us</td><td align="right">245</td></tr>
<tr><td>AES128 (ECB mode)</td><td align="right">33.28us</td><td align="right">63.18us</td><td align="right">158.68us</td><td align="right">181</td></tr>
<tr><td>AES192 (ECB mode)</td><td align="right">39.94us</td><td align="right">76.48us</td><td align="right">165.34us</td><td align="right">213</td></tr>
<tr><td>AES256 (ECB mode)</td><td align="right">46.61us</td><td align="right">89.78us</td><td align="right">217.79us</td><td align="right">245</td></tr>
<tr><td>AESTiny128 (ECB mode)</td><td align="right">40.37us</td><td align="right"> </td><td align="right">10.16us</td><td align="right">18</td></tr>
<tr><td>AESTiny256 (ECB mode)</td><td align="right">56.84us</td><td align="right"> </td><td align="right">17.20us</td><td align="right">34</td></tr>
<tr><td>AESSmall128 (ECB mode)</td><td align="right">40.37us</td><td align="right">71.36us</td><td align="right">134.22us</td><td align="right">34</td></tr>
<tr><td>AESSmall256 (ECB mode)</td><td align="right">56.84us</td><td align="right">100.55us</td><td align="right">177.73us</td><td align="right">66</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">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>
@@ -159,9 +175,13 @@ All figures are for the Arduino Due running at 84 MHz:
<table>
<tr><td>Encryption Algorithm</td><td align="right">Encryption (per byte)</td><td align="right">Decryption (per byte)</td><td align="right">Key Setup</td><td>State Size (bytes)</td></tr>
<tr><td>AES128 (ECB mode)</td><td align="right">5.71us</td><td align="right">10.41us</td><td align="right">34.73us</td><td align="right">188</td></tr>
<tr><td>AES192 (ECB mode)</td><td align="right">6.87us</td><td align="right">12.57us</td><td align="right">36.51us</td><td align="right">220</td></tr>
<tr><td>AES256 (ECB mode)</td><td align="right">8.04us</td><td align="right">14.72</td><td align="right">49.96us</td><td align="right">252</td></tr>
<tr><td>AES128 (ECB mode)</td><td align="right">6.58us</td><td align="right">11.40us</td><td align="right">38.15us</td><td align="right">188</td></tr>
<tr><td>AES192 (ECB mode)</td><td align="right">7.94us</td><td align="right">13.83us</td><td align="right">39.79us</td><td align="right">220</td></tr>
<tr><td>AES256 (ECB mode)</td><td align="right">9.30us</td><td align="right">16.25us</td><td align="right">49.68us</td><td align="right">252</td></tr>
<tr><td>AESTiny128 (ECB mode)</td><td align="right">7.23us</td><td align="right"> </td><td align="right">1.25us</td><td align="right">20</td></tr>
<tr><td>AESTiny256 (ECB mode)</td><td align="right">10.62us</td><td align="right"> </td><td align="right">1.43us</td><td align="right">36</td></tr>
<tr><td>AESSmall128 (ECB mode)</td><td align="right">7.23us</td><td align="right">12.33us</td><td align="right">23.44us</td><td align="right">36</td></tr>
<tr><td>AESSmall256 (ECB mode)</td><td align="right">10.62us</td><td align="right">16.92us</td><td align="right">31.88us</td><td align="right">68</td></tr>
<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>