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<div class="textblock"><h1><a class="anchor" id="crypto_algorithms"></a>
Supported Algorithms</h1>
<ul>
<li>Block ciphers: <a class="el" href="classAES128.html" title="AES block cipher with 128-bit keys. ">AES128</a>, <a class="el" href="classAES192.html" title="AES block cipher with 192-bit keys. ">AES192</a>, <a class="el" href="classAES256.html" title="AES block cipher with 256-bit keys. ">AES256</a>, <a class="el" href="classSpeck.html" title="Speck block cipher with a 128-bit block size. ">Speck</a> </li>
<li>Block cipher modes: <a class="el" href="classCTR.html" title="Implementation of the Counter (CTR) mode for 128-bit block ciphers. ">CTR</a>, <a class="el" href="classCFB.html" title="Implementation of the Cipher Feedback (CFB) mode for 128-bit block ciphers. ">CFB</a>, <a class="el" href="classCBC.html" title="Implementation of the Cipher Block Chaining (CBC) mode for 128-bit block ciphers. ...">CBC</a>, <a class="el" href="classOFB.html" title="Implementation of the Output Feedback (OFB) mode for 128-bit block ciphers. ">OFB</a>, <a class="el" href="classEAX.html" title="Implementation of the EAX authenticated cipher. ">EAX</a>, <a class="el" href="classGCM.html" title="Implementation of the Galois Counter Mode (GCM). ">GCM</a>, <a class="el" href="classXTS.html" title="Implementation of the XTS mode for 128-bit block ciphers. ">XTS</a> </li>
<li>Stream ciphers: <a class="el" href="classChaCha.html" title="ChaCha stream cipher. ">ChaCha</a> </li>
<li>Authenticated encryption with associated data (AEAD): <a class="el" href="classChaChaPoly.html" title="Authenticated cipher based on ChaCha and Poly1305. ">ChaChaPoly</a>, <a class="el" href="classEAX.html" title="Implementation of the EAX authenticated cipher. ">EAX</a>, <a class="el" href="classGCM.html" title="Implementation of the Galois Counter Mode (GCM). ">GCM</a> </li>
<li><a class="el" href="classHash.html" title="Abstract base class for cryptographic hash algorithms. ">Hash</a> algorithms: <a class="el" href="classSHA256.html" title="SHA-256 hash algorithm. ">SHA256</a>, <a class="el" href="classSHA512.html" title="SHA-512 hash algorithm. ">SHA512</a>, <a class="el" href="classSHA3__256.html" title="SHA3-256 hash algorithm. ">SHA3_256</a>, <a class="el" href="classSHA3__512.html" title="SHA3-512 hash algorithm. ">SHA3_512</a>, <a class="el" href="classBLAKE2s.html" title="BLAKE2s hash algorithm. ">BLAKE2s</a>, <a class="el" href="classBLAKE2b.html" title="BLAKE2b hash algorithm. ">BLAKE2b</a> (regular and HMAC modes) </li>
<li>Extendable output functions (<a class="el" href="classXOF.html" title="Abstract base class for Extendable-Output Functions (XOFs). ">XOF</a>'s): <a class="el" href="classSHAKE128.html" title="SHAKE Extendable-Output Function (XOF) with 128-bit security. ">SHAKE128</a>, <a class="el" href="classSHAKE256.html" title="SHAKE Extendable-Output Function (XOF) with 256-bit security. ">SHAKE256</a> </li>
<li>Message authenticators: <a class="el" href="classPoly1305.html" title="Poly1305 message authenticator. ">Poly1305</a>, <a class="el" href="classGHASH.html" title="Implementation of the GHASH message authenticator. ">GHASH</a>, <a class="el" href="classOMAC.html" title="Implementation of the OMAC message authenticator. ">OMAC</a> </li>
<li>Public key algorithms: <a class="el" href="classCurve25519.html" title="Diffie-Hellman key agreement based on the elliptic curve modulo 2^255 - 19. ">Curve25519</a>, <a class="el" href="classEd25519.html" title="Digital signatures based on the elliptic curve modulo 2^255 - 19. ">Ed25519</a>, <a class="el" href="classP521.html" title="Elliptic curve operations with the NIST P-521 curve. ">P521</a> </li>
<li>Post-quantum algorithms: <a class="el" href="classNewHope.html" title="NewHope post-quantum key exchange algorithm. ">NewHope</a> </li>
<li>Random number generation: <a class="el" href="classRNGClass.html">RNG</a>, <a class="el" href="classTransistorNoiseSource.html" title="Processes the signal from a transistor-based noise source. ">TransistorNoiseSource</a>, <a class="el" href="classRingOscillatorNoiseSource.html" title="Processes the signal from a ring oscillator based noise source. ">RingOscillatorNoiseSource</a></li>
</ul>
<p>All cryptographic algorithms have been optimized for 8-bit Arduino platforms like the Uno. Memory usage is also reduced, particularly for <a class="el" href="classSHA256.html" title="SHA-256 hash algorithm. ">SHA256</a> and <a class="el" href="classSHA512.html" title="SHA-512 hash algorithm. ">SHA512</a> which save 192 and 512 bytes respectively over traditional implementations. For all algorithms, static sbox tables and the like are placed into program memory to further reduce data memory usage.</p>
<p><a class="el" href="classChaCha.html" title="ChaCha stream cipher. ">ChaCha</a> with 20 rounds and 256-bit keys is the recommended symmetric encryption algorithm because it is twice as fast as <a class="el" href="classAES128.html" title="AES block cipher with 128-bit keys. ">AES128</a>, constant-time, and much more secure. <a class="el" href="classAES128.html" title="AES block cipher with 128-bit keys. ">AES128</a>, <a class="el" href="classAES192.html" title="AES block cipher with 192-bit keys. ">AES192</a>, and <a class="el" href="classAES256.html" title="AES block cipher with 256-bit keys. ">AES256</a> are provided for use in applications where compatibility with other systems is desirable.</p>
<p>If code size is an issue for your application (for example on very low end Arduino variants), then <a class="el" href="classSpeck.html" title="Speck block cipher with a 128-bit block size. ">Speck</a> on AVR is less than half the code size of <a class="el" href="classChaCha.html" title="ChaCha stream cipher. ">ChaCha</a>, at the cost of more data memory for the state and longer key setup times. The <a class="el" href="classSpeckTiny.html" title="Speck block cipher with a 128-bit block size (tiny-memory version). ">SpeckTiny</a> and <a class="el" href="classSpeckSmall.html" title="Speck block cipher with a 128-bit block size (small-memory version). ">SpeckSmall</a> classes are even smaller at the cost of some performance when encrypting.</p>
<p><a class="el" href="classBLAKE2s.html" title="BLAKE2s hash algorithm. ">BLAKE2s</a> and <a class="el" href="classBLAKE2b.html" title="BLAKE2b hash algorithm. ">BLAKE2b</a> are variations on the <a class="el" href="classChaCha.html" title="ChaCha stream cipher. ">ChaCha</a> stream cipher, designed for hashing, with 256-bit and 512-bit hash outputs respectively. They are intended as high performance replacements for <a class="el" href="classSHA256.html" title="SHA-256 hash algorithm. ">SHA256</a> and <a class="el" href="classSHA512.html" title="SHA-512 hash algorithm. ">SHA512</a> for when speed is critical but exact bit-compatibility of hash values is not. <a class="el" href="classBLAKE2s.html" title="BLAKE2s hash algorithm. ">BLAKE2s</a> and <a class="el" href="classBLAKE2b.html" title="BLAKE2b hash algorithm. ">BLAKE2b</a> support regular hashing, BLAKE2 keyed hashing, and HMAC modes.</p>
<h1><a class="anchor" id="crypto_other"></a>
Examples and other topics</h1>
<ul>
<li><a class="el" href="crypto_rng.html">Generating random numbers</a> </li>
<li><a class="el" href="crypto_esp.html">Using the cryptography library with ESP8266</a></li>
</ul>
<h1><a class="anchor" id="crypto_performance"></a>
Performance</h1>
<h2><a class="anchor" id="crypto_performance_avr"></a>
Performance on AVR</h2>
<p>All figures are for the Arduino Uno running at 16 MHz. Figures for the Ardunino Mega 2560 running at 16 MHz are similar:</p>
<table class="doxtable">
<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><a class="el" href="classAES128.html" title="AES block cipher with 128-bit keys. ">AES128</a> (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><a class="el" href="classAES192.html" title="AES block cipher with 192-bit keys. ">AES192</a> (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><a class="el" href="classAES256.html" title="AES block cipher with 256-bit keys. ">AES256</a> (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><a class="el" href="classChaCha.html" title="ChaCha stream cipher. ">ChaCha</a> (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><a class="el" href="classChaCha.html" title="ChaCha stream cipher. ">ChaCha</a> (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><a class="el" href="classChaCha.html" title="ChaCha stream cipher. ">ChaCha</a> (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><a class="el" href="classSpeck.html" title="Speck block cipher with a 128-bit block size. ">Speck</a> (128-bit key, ECB mode)</td><td align="right">9.74us</td><td align="right">10.12us</td><td align="right">253.94us</td><td align="right">275 </td></tr>
<tr>
<td><a class="el" href="classSpeck.html" title="Speck block cipher with a 128-bit block size. ">Speck</a> (192-bit key, ECB mode)</td><td align="right">10.03us</td><td align="right">10.41us</td><td align="right">264.63us</td><td align="right">275 </td></tr>
<tr>
<td><a class="el" href="classSpeck.html" title="Speck block cipher with a 128-bit block size. ">Speck</a> (256-bit key, ECB mode)</td><td align="right">10.31us</td><td align="right">10.71us</td><td align="right">275.26us</td><td align="right">275 </td></tr>
<tr>
<td><a class="el" href="classSpeckSmall.html" title="Speck block cipher with a 128-bit block size (small-memory version). ">SpeckSmall</a> (128-bit key, ECB mode)</td><td align="right">33.93us</td><td align="right">34.82us</td><td align="right">207.66us</td><td align="right">67 </td></tr>
<tr>
<td><a class="el" href="classSpeckSmall.html" title="Speck block cipher with a 128-bit block size (small-memory version). ">SpeckSmall</a> (192-bit key, ECB mode)</td><td align="right">35.20us</td><td align="right">35.88us</td><td align="right">220.55us</td><td align="right">67 </td></tr>
<tr>
<td><a class="el" href="classSpeckSmall.html" title="Speck block cipher with a 128-bit block size (small-memory version). ">SpeckSmall</a> (256-bit key, ECB mode)</td><td align="right">36.46us</td><td align="right">36.93us</td><td align="right">233.32us</td><td align="right">67 </td></tr>
<tr>
<td><a class="el" href="classSpeckTiny.html" title="Speck block cipher with a 128-bit block size (tiny-memory version). ">SpeckTiny</a> (128-bit key, ECB mode)</td><td align="right">33.93us</td><td align="right"></td><td align="right">10.22us</td><td align="right">35 </td></tr>
<tr>
<td><a class="el" href="classSpeckTiny.html" title="Speck block cipher with a 128-bit block size (tiny-memory version). ">SpeckTiny</a> (192-bit key, ECB mode)</td><td align="right">35.20us</td><td align="right"></td><td align="right">13.62us</td><td align="right">35 </td></tr>
<tr>
<td><a class="el" href="classSpeckTiny.html" title="Speck block cipher with a 128-bit block size (tiny-memory version). ">SpeckTiny</a> (256-bit key, ECB mode)</td><td align="right">36.46us</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 align="right">Key Setup</td><td>State Size (bytes) </td></tr>
<tr>
<td><a class="el" href="classChaChaPoly.html" title="Authenticated cipher based on ChaCha and Poly1305. ">ChaChaPoly</a></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>
<tr>
<td><a class="el" href="classGCM.html" title="Implementation of the Galois Counter Mode (GCM). ">GCM</a>&lt;<a class="el" href="classAES128.html" title="AES block cipher with 128-bit keys. ">AES128</a>&gt;</td><td align="right">109.71us</td><td align="right">109.26us</td><td align="right">1265.69us</td><td align="right">284 </td></tr>
<tr>
<td><a class="el" href="classGCM.html" title="Implementation of the Galois Counter Mode (GCM). ">GCM</a>&lt;<a class="el" href="classAES192.html" title="AES block cipher with 192-bit keys. ">AES192</a>&gt;</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>
<tr>
<td><a class="el" href="classGCM.html" title="Implementation of the Galois Counter Mode (GCM). ">GCM</a>&lt;<a class="el" href="classAES256.html" title="AES block cipher with 256-bit keys. ">AES256</a>&gt;</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>
<tr>
<td><a class="el" href="classGCM.html" title="Implementation of the Galois Counter Mode (GCM). ">GCM</a>&lt;<a class="el" href="classSpeck.html" title="Speck block cipher with a 128-bit block size. ">Speck</a>&gt; (256-bit key)</td><td align="right">86.74us</td><td align="right">86.29us</td><td align="right">646.88us</td><td align="right">378 </td></tr>
<tr>
<td><a class="el" href="classGCM.html" title="Implementation of the Galois Counter Mode (GCM). ">GCM</a>&lt;<a class="el" href="classSpeckTiny.html" title="Speck block cipher with a 128-bit block size (tiny-memory version). ">SpeckTiny</a>&gt; (256-bit key)</td><td align="right">112.90us</td><td align="right">112.44us</td><td align="right">1225.48us</td><td align="right">138 </td></tr>
<tr>
<td><a class="el" href="classEAX.html" title="Implementation of the EAX authenticated cipher. ">EAX</a>&lt;<a class="el" href="classAES128.html" title="AES block cipher with 128-bit keys. ">AES128</a>&gt;</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>
<tr>
<td><a class="el" href="classEAX.html" title="Implementation of the EAX authenticated cipher. ">EAX</a>&lt;<a class="el" href="classAES256.html" title="AES block cipher with 256-bit keys. ">AES256</a>&gt;</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>
<tr>
<td><a class="el" href="classEAX.html" title="Implementation of the EAX authenticated cipher. ">EAX</a>&lt;<a class="el" href="classSpeck.html" title="Speck block cipher with a 128-bit block size. ">Speck</a>&gt; (256-bit key)</td><td align="right">25.89us</td><td align="right">25.88us</td><td align="right">690.63us</td><td align="right">362 </td></tr>
<tr>
<td><a class="el" href="classEAX.html" title="Implementation of the EAX authenticated cipher. ">EAX</a>&lt;<a class="el" href="classSpeckTiny.html" title="Speck block cipher with a 128-bit block size (tiny-memory version). ">SpeckTiny</a>&gt; (256-bit key)</td><td align="right">78.20us</td><td align="right">78.20us</td><td align="right">1269.19us</td><td align="right">122 </td></tr>
<tr>
<td colspan="5"></td></tr>
<tr>
<td><a class="el" href="classHash.html" title="Abstract base class for cryptographic hash algorithms. ">Hash</a> Algorithm</td><td align="right">Hashing (per byte)</td><td align="right">Finalization</td><td></td><td>State Size (bytes) </td></tr>
<tr>
<td><a class="el" href="classSHA256.html" title="SHA-256 hash algorithm. ">SHA256</a></td><td align="right">43.85us</td><td align="right">2841.04us</td><td align="right"></td><td align="right">107 </td></tr>
<tr>
<td><a class="el" href="classSHA512.html" title="SHA-512 hash algorithm. ">SHA512</a></td><td align="right">122.82us</td><td align="right">15953.42us</td><td align="right"></td><td align="right">211 </td></tr>
<tr>
<td><a class="el" href="classSHA3__256.html" title="SHA3-256 hash algorithm. ">SHA3_256</a></td><td align="right">60.69us</td><td align="right">8180.24us</td><td align="right"></td><td align="right">205 </td></tr>
<tr>
<td><a class="el" href="classSHA3__512.html" title="SHA3-512 hash algorithm. ">SHA3_512</a></td><td align="right">113.88us</td><td align="right">8196.34us</td><td align="right"></td><td align="right">205 </td></tr>
<tr>
<td><a class="el" href="classBLAKE2s.html" title="BLAKE2s hash algorithm. ">BLAKE2s</a></td><td align="right">20.65us</td><td align="right">1335.25us</td><td align="right"></td><td align="right">107 </td></tr>
<tr>
<td><a class="el" href="classBLAKE2b.html" title="BLAKE2b hash algorithm. ">BLAKE2b</a></td><td align="right">65.22us</td><td align="right">8375.34us</td><td align="right"></td><td align="right">211 </td></tr>
<tr>
<td colspan="5"></td></tr>
<tr>
<td>Authentication Algorithm</td><td align="right">Hashing (per byte)</td><td align="right">Finalization</td><td align="right">Key Setup</td><td>State Size (bytes) </td></tr>
<tr>
<td><a class="el" href="classSHA256.html" title="SHA-256 hash algorithm. ">SHA256</a> (HMAC mode)</td><td align="right">43.85us</td><td align="right">8552.61us</td><td align="right">2836.49us</td><td align="right">107 </td></tr>
<tr>
<td><a class="el" href="classBLAKE2s.html" title="BLAKE2s hash algorithm. ">BLAKE2s</a> (Keyed mode)</td><td align="right">20.65us</td><td align="right">1335.25us</td><td align="right">1339.51us</td><td align="right">107 </td></tr>
<tr>
<td><a class="el" href="classBLAKE2s.html" title="BLAKE2s hash algorithm. ">BLAKE2s</a> (HMAC mode)</td><td align="right">20.65us</td><td align="right">4055.56us</td><td align="right">1350.00us</td><td align="right">107 </td></tr>
<tr>
<td><a class="el" href="classBLAKE2b.html" title="BLAKE2b hash algorithm. ">BLAKE2b</a> (Keyed mode)</td><td align="right">65.22us</td><td align="right">8375.34us</td><td align="right">8357.25us</td><td align="right">211 </td></tr>
<tr>
<td><a class="el" href="classPoly1305.html" title="Poly1305 message authenticator. ">Poly1305</a></td><td align="right">26.26us</td><td align="right">489.11us</td><td align="right">17.06us</td><td align="right">53 </td></tr>
<tr>
<td><a class="el" href="classGHASH.html" title="Implementation of the GHASH message authenticator. ">GHASH</a></td><td align="right">74.59us</td><td align="right">15.91us</td><td align="right">14.79us</td><td align="right">33 </td></tr>
<tr>
<td colspan="5"></td></tr>
<tr>
<td><a class="el" href="classXOF.html" title="Abstract base class for Extendable-Output Functions (XOFs). ">XOF</a> Algorithm</td><td align="right">Hashing (per byte)</td><td align="right">Extending (per byte)</td><td>Encryption (per byte)</td><td>State Size (bytes) </td></tr>
<tr>
<td><a class="el" href="classSHAKE128.html" title="SHAKE Extendable-Output Function (XOF) with 128-bit security. ">SHAKE128</a></td><td align="right">49.43us</td><td align="right">49.02us</td><td align="right">49.59us</td><td align="right">206 </td></tr>
<tr>
<td><a class="el" href="classSHAKE256.html" title="SHAKE Extendable-Output Function (XOF) with 256-bit security. ">SHAKE256</a></td><td align="right">60.77us</td><td align="right">60.37us</td><td align="right">60.93us</td><td align="right">206 </td></tr>
<tr>
<td colspan="5"></td></tr>
<tr>
<td>Public Key Operation</td><td align="right">Time (per operation)</td><td colspan="3">Comment </td></tr>
<tr>
<td><a class="el" href="classCurve25519.html#a2e4b7dd83a019b32c76584c99bfda21a" title="Evaluates the raw Curve25519 function. ">Curve25519::eval()</a></td><td align="right">2716ms</td><td colspan="3">Raw curve evaluation </td></tr>
<tr>
<td><a class="el" href="classCurve25519.html#a2b6911583d17ea9a36bbbb40d58b3d89" title="Performs phase 1 of a Diffie-Hellman key exchange using Curve25519. ">Curve25519::dh1()</a></td><td align="right">2718ms</td><td colspan="3">First half of Diffie-Hellman key agreement </td></tr>
<tr>
<td><a class="el" href="classCurve25519.html#a14022d6ac68ec691ffb0247275078ab9" title="Performs phase 2 of a Diffie-Hellman key exchange using Curve25519. ">Curve25519::dh2()</a></td><td align="right">2717ms</td><td colspan="3">Second half of Diffie-Hellman key agreement </td></tr>
<tr>
<td><a class="el" href="classEd25519.html#a36ecf67b4c5d2d39a31888f56af1f8a5" title="Signs a message using a specific Ed25519 private key. ">Ed25519::sign()</a></td><td align="right">5148ms</td><td colspan="3">Digital signature generation </td></tr>
<tr>
<td><a class="el" href="classEd25519.html#ae3e2fc405c9cd8cb1d3ab9b8b452d3e4" title="Verifies a signature using a specific Ed25519 public key. ">Ed25519::verify()</a></td><td align="right">8196ms</td><td colspan="3">Digital signature verification </td></tr>
<tr>
<td><a class="el" href="classEd25519.html#ab62bac52ed07f77f76f3ff0fccd71cb2" title="Derives the public key from a private key. ">Ed25519::derivePublicKey()</a></td><td align="right">5102ms</td><td colspan="3">Derive a public key from a private key </td></tr>
<tr>
<td><a class="el" href="classP521.html#ac2e07ce7e846ba180938b41b4a2ae563" title="Evaluates the curve function. ">P521::eval()</a></td><td align="right">46290ms</td><td colspan="3">Raw curve evaluation </td></tr>
<tr>
<td><a class="el" href="classP521.html#ae04c439804f445535295bf44ae56afbf" title="Performs phase 1 of an ECDH key exchange using P-521. ">P521::dh1()</a></td><td align="right">46293ms</td><td colspan="3">First half of Diffie-Hellman key agreement </td></tr>
<tr>
<td><a class="el" href="classP521.html#a7b9d4f74cc2d71a488a33ab165537491" title="Performs phase 2 of an ECDH key exchange using P-521. ">P521::dh2()</a></td><td align="right">46304ms</td><td colspan="3">Second half of Diffie-Hellman key agreement </td></tr>
<tr>
<td><a class="el" href="classP521.html#ab050ceff65e49b646b8157fe1474288a" title="Signs a message using a specific P-521 private key. ">P521::sign()</a></td><td align="right">60514ms</td><td colspan="3">Digital signature generation </td></tr>
<tr>
<td><a class="el" href="classP521.html#ab075909f5cecbb801c6b7c41f20de223" title="Verifies a signature using a specific P-521 public key. ">P521::verify()</a></td><td align="right">109078ms</td><td colspan="3">Digital signature verification </td></tr>
<tr>
<td><a class="el" href="classP521.html#a15ca802e298c7ff3be06924b0edb7daa" title="Derives the public key from a private key for P-521 signing operations. ">P521::derivePublicKey()</a></td><td align="right">46290ms</td><td colspan="3">Derive a public key from a private key </td></tr>
<tr>
<td><a class="el" href="classNewHope.html#a335b17b40949f66aa579d1035384662c" title="Generates the key pair for Alice in a New Hope key exchange. ">NewHope::keygen()</a>, Ref</td><td align="right">639ms</td><td colspan="3">Generate key pair for Alice, Ref version </td></tr>
<tr>
<td><a class="el" href="classNewHope.html#a2f09529f5f73cf9763c28b58b13bbd14" title="Generates the public key and shared secret for Bob. ">NewHope::sharedb()</a>, Ref</td><td align="right">1237ms</td><td colspan="3">Generate shared secret and public key for Bob, Ref version </td></tr>
<tr>
<td><a class="el" href="classNewHope.html#ac8128e0799fe74a6c69c541e0d6bd66e" title="Generates the shared secret for Alice. ">NewHope::shareda()</a>, Ref</td><td align="right">496ms</td><td colspan="3">Generate shared secret for Alice, Ref version </td></tr>
<tr>
<td><a class="el" href="classNewHope.html#a335b17b40949f66aa579d1035384662c" title="Generates the key pair for Alice in a New Hope key exchange. ">NewHope::keygen()</a>, Torref</td><td align="right">777ms</td><td colspan="3">Generate key pair for Alice, Torref version </td></tr>
<tr>
<td><a class="el" href="classNewHope.html#a2f09529f5f73cf9763c28b58b13bbd14" title="Generates the public key and shared secret for Bob. ">NewHope::sharedb()</a>, Torref</td><td align="right">1376ms</td><td colspan="3">Generate shared secret and public key for Bob, Torref version </td></tr>
<tr>
<td><a class="el" href="classNewHope.html#ac8128e0799fe74a6c69c541e0d6bd66e" title="Generates the shared secret for Alice. ">NewHope::shareda()</a>, Torref</td><td align="right">496ms</td><td colspan="3">Generate shared secret for Alice, Torref version </td></tr>
</table>
<p>Where a cipher supports more than one key size (such as <a class="el" href="classChaCha.html" title="ChaCha stream cipher. ">ChaCha</a>), the values are typically almost identical for 128-bit and 256-bit keys so only the maximum is shown above.</p>
<p>Due to the memory requirements, <a class="el" href="classP521.html" title="Elliptic curve operations with the NIST P-521 curve. ">P521</a> and <a class="el" href="classNewHope.html" title="NewHope post-quantum key exchange algorithm. ">NewHope</a> performance was measured on an Arduino Mega 2560 running at 16 MHz. They are too big to fit in the RAM size of the Uno.</p>
<h2><a class="anchor" id="crypto_performance_arm"></a>
Performance on ARM</h2>
<p>All figures are for the Arduino Due running at 84 MHz:</p>
<table class="doxtable">
<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><a class="el" href="classAES128.html" title="AES block cipher with 128-bit keys. ">AES128</a> (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><a class="el" href="classAES192.html" title="AES block cipher with 192-bit keys. ">AES192</a> (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><a class="el" href="classAES256.html" title="AES block cipher with 256-bit keys. ">AES256</a> (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><a class="el" href="classChaCha.html" title="ChaCha stream cipher. ">ChaCha</a> (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><a class="el" href="classChaCha.html" title="ChaCha stream cipher. ">ChaCha</a> (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><a class="el" href="classChaCha.html" title="ChaCha stream cipher. ">ChaCha</a> (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><a class="el" href="classSpeck.html" title="Speck block cipher with a 128-bit block size. ">Speck</a> (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><a class="el" href="classSpeck.html" title="Speck block cipher with a 128-bit block size. ">Speck</a> (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><a class="el" href="classSpeck.html" title="Speck block cipher with a 128-bit block size. ">Speck</a> (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><a class="el" href="classSpeckSmall.html" title="Speck block cipher with a 128-bit block size (small-memory version). ">SpeckSmall</a> (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>
<tr>
<td><a class="el" href="classSpeckSmall.html" title="Speck block cipher with a 128-bit block size (small-memory version). ">SpeckSmall</a> (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>
<tr>
<td><a class="el" href="classSpeckSmall.html" title="Speck block cipher with a 128-bit block size (small-memory version). ">SpeckSmall</a> (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>
<tr>
<td><a class="el" href="classSpeckTiny.html" title="Speck block cipher with a 128-bit block size (tiny-memory version). ">SpeckTiny</a> (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><a class="el" href="classSpeckTiny.html" title="Speck block cipher with a 128-bit block size (tiny-memory version). ">SpeckTiny</a> (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><a class="el" href="classSpeckTiny.html" title="Speck block cipher with a 128-bit block size (tiny-memory version). ">SpeckTiny</a> (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 align="right">Key Setup</td><td>State Size (bytes) </td></tr>
<tr>
<td><a class="el" href="classChaChaPoly.html" title="Authenticated cipher based on ChaCha and Poly1305. ">ChaChaPoly</a></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>
<tr>
<td><a class="el" href="classGCM.html" title="Implementation of the Galois Counter Mode (GCM). ">GCM</a>&lt;<a class="el" href="classAES128.html" title="AES block cipher with 128-bit keys. ">AES128</a>&gt;</td><td align="right">10.90us</td><td align="right">10.90us</td><td align="right">248.83us</td><td align="right">312 </td></tr>
<tr>
<td><a class="el" href="classGCM.html" title="Implementation of the Galois Counter Mode (GCM). ">GCM</a>&lt;<a class="el" href="classAES192.html" title="AES block cipher with 192-bit keys. ">AES192</a>&gt;</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>
<tr>
<td><a class="el" href="classGCM.html" title="Implementation of the Galois Counter Mode (GCM). ">GCM</a>&lt;<a class="el" href="classAES256.html" title="AES block cipher with 256-bit keys. ">AES256</a>&gt;</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>
<tr>
<td><a class="el" href="classGCM.html" title="Implementation of the Galois Counter Mode (GCM). ">GCM</a>&lt;<a class="el" href="classSpeck.html" title="Speck block cipher with a 128-bit block size. ">Speck</a>&gt; (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>
<tr>
<td><a class="el" href="classGCM.html" title="Implementation of the Galois Counter Mode (GCM). ">GCM</a>&lt;<a class="el" href="classSpeckTiny.html" title="Speck block cipher with a 128-bit block size (tiny-memory version). ">SpeckTiny</a>&gt; (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>
<tr>
<td><a class="el" href="classEAX.html" title="Implementation of the EAX authenticated cipher. ">EAX</a>&lt;<a class="el" href="classAES128.html" title="AES block cipher with 128-bit keys. ">AES128</a>&gt;</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>
<tr>
<td><a class="el" href="classEAX.html" title="Implementation of the EAX authenticated cipher. ">EAX</a>&lt;<a class="el" href="classAES256.html" title="AES block cipher with 256-bit keys. ">AES256</a>&gt;</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>
<tr>
<td><a class="el" href="classEAX.html" title="Implementation of the EAX authenticated cipher. ">EAX</a>&lt;<a class="el" href="classSpeck.html" title="Speck block cipher with a 128-bit block size. ">Speck</a>&gt; (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>
<tr>
<td><a class="el" href="classEAX.html" title="Implementation of the EAX authenticated cipher. ">EAX</a>&lt;<a class="el" href="classSpeckTiny.html" title="Speck block cipher with a 128-bit block size (tiny-memory version). ">SpeckTiny</a>&gt; (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>
<tr>
<td colspan="5"></td></tr>
<tr>
<td><a class="el" href="classHash.html" title="Abstract base class for cryptographic hash algorithms. ">Hash</a> Algorithm</td><td align="right">Hashing (per byte)</td><td align="right">Finalization</td><td></td><td>State Size (bytes) </td></tr>
<tr>
<td><a class="el" href="classSHA256.html" title="SHA-256 hash algorithm. ">SHA256</a></td><td align="right">1.15us</td><td align="right">76.60us</td><td align="right"></td><td align="right">120 </td></tr>
<tr>
<td><a class="el" href="classSHA512.html" title="SHA-512 hash algorithm. ">SHA512</a></td><td align="right">2.87us</td><td align="right">370.37us</td><td align="right"></td><td align="right">224 </td></tr>
<tr>
<td><a class="el" href="classSHA3__256.html" title="SHA3-256 hash algorithm. ">SHA3_256</a></td><td align="right">5.64us</td><td align="right">735.29us</td><td align="right"></td><td align="right">224 </td></tr>
<tr>
<td><a class="el" href="classSHA3__512.html" title="SHA3-512 hash algorithm. ">SHA3_512</a></td><td align="right">10.42us</td><td align="right">735.49us</td><td align="right"></td><td align="right">224 </td></tr>
<tr>
<td><a class="el" href="classBLAKE2s.html" title="BLAKE2s hash algorithm. ">BLAKE2s</a></td><td align="right">0.80us</td><td align="right">53.39us</td><td align="right"></td><td align="right">120 </td></tr>
<tr>
<td><a class="el" href="classBLAKE2b.html" title="BLAKE2b hash algorithm. ">BLAKE2b</a></td><td align="right">1.28us</td><td align="right">164.66us</td><td align="right"></td><td align="right">224 </td></tr>
<tr>
<td colspan="5"></td></tr>
<tr>
<td>Authentication Algorithm</td><td align="right">Hashing (per byte)</td><td align="right">Finalization</td><td align="right">Key Setup</td><td>State Size (bytes) </td></tr>
<tr>
<td><a class="el" href="classSHA256.html" title="SHA-256 hash algorithm. ">SHA256</a> (HMAC mode)</td><td align="right">1.15us</td><td align="right">238.98us</td><td align="right">80.44us</td><td align="right">120 </td></tr>
<tr>
<td><a class="el" href="classBLAKE2s.html" title="BLAKE2s hash algorithm. ">BLAKE2s</a> (Keyed mode)</td><td align="right">0.80us</td><td align="right">53.39us</td><td align="right">55.10us</td><td align="right">120 </td></tr>
<tr>
<td><a class="el" href="classBLAKE2s.html" title="BLAKE2s hash algorithm. ">BLAKE2s</a> (HMAC mode)</td><td align="right">0.80us</td><td align="right">168.20us</td><td align="right">57.60us</td><td align="right">120 </td></tr>
<tr>
<td><a class="el" href="classBLAKE2b.html" title="BLAKE2b hash algorithm. ">BLAKE2b</a> (Keyed mode)</td><td align="right">1.28us</td><td align="right">164.66us</td><td align="right">166.68us</td><td align="right">224 </td></tr>
<tr>
<td><a class="el" href="classPoly1305.html" title="Poly1305 message authenticator. ">Poly1305</a></td><td align="right">0.81us</td><td align="right">19.01us</td><td align="right">2.57us</td><td align="right">60 </td></tr>
<tr>
<td><a class="el" href="classGHASH.html" title="Implementation of the GHASH message authenticator. ">GHASH</a></td><td align="right">4.47us</td><td align="right">1.52us</td><td align="right">2.60us</td><td align="right">36 </td></tr>
<tr>
<td colspan="5"></td></tr>
<tr>
<td><a class="el" href="classXOF.html" title="Abstract base class for Extendable-Output Functions (XOFs). ">XOF</a> Algorithm</td><td align="right">Hashing (per byte)</td><td align="right">Extending (per byte)</td><td>Encryption (per byte)</td><td>State Size (bytes) </td></tr>
<tr>
<td><a class="el" href="classSHAKE128.html" title="SHAKE Extendable-Output Function (XOF) with 128-bit security. ">SHAKE128</a></td><td align="right">4.60us</td><td align="right">4.45us</td><td align="right">4.59us</td><td align="right">232 </td></tr>
<tr>
<td><a class="el" href="classSHAKE256.html" title="SHAKE Extendable-Output Function (XOF) with 256-bit security. ">SHAKE256</a></td><td align="right">5.64us</td><td align="right">5.49us</td><td align="right">5.63us</td><td align="right">232 </td></tr>
<tr>
<td colspan="5"></td></tr>
<tr>
<td>Public Key Operation</td><td align="right">Time (per operation)</td><td colspan="3">Comment </td></tr>
<tr>
<td><a class="el" href="classCurve25519.html#a2e4b7dd83a019b32c76584c99bfda21a" title="Evaluates the raw Curve25519 function. ">Curve25519::eval()</a></td><td align="right">103ms</td><td colspan="3">Raw curve evaluation </td></tr>
<tr>
<td><a class="el" href="classCurve25519.html#a2b6911583d17ea9a36bbbb40d58b3d89" title="Performs phase 1 of a Diffie-Hellman key exchange using Curve25519. ">Curve25519::dh1()</a></td><td align="right">103ms</td><td colspan="3">First half of Diffie-Hellman key agreement </td></tr>
<tr>
<td><a class="el" href="classCurve25519.html#a14022d6ac68ec691ffb0247275078ab9" title="Performs phase 2 of a Diffie-Hellman key exchange using Curve25519. ">Curve25519::dh2()</a></td><td align="right">104ms</td><td colspan="3">Second half of Diffie-Hellman key agreement </td></tr>
<tr>
<td><a class="el" href="classEd25519.html#a36ecf67b4c5d2d39a31888f56af1f8a5" title="Signs a message using a specific Ed25519 private key. ">Ed25519::sign()</a></td><td align="right">195ms</td><td colspan="3">Digital signature generation </td></tr>
<tr>
<td><a class="el" href="classEd25519.html#ae3e2fc405c9cd8cb1d3ab9b8b452d3e4" title="Verifies a signature using a specific Ed25519 public key. ">Ed25519::verify()</a></td><td align="right">306ms</td><td colspan="3">Digital signature verification </td></tr>
<tr>
<td><a class="el" href="classEd25519.html#ab62bac52ed07f77f76f3ff0fccd71cb2" title="Derives the public key from a private key. ">Ed25519::derivePublicKey()</a></td><td align="right">194ms</td><td colspan="3">Derive a public key from a private key </td></tr>
<tr>
<td><a class="el" href="classP521.html#ac2e07ce7e846ba180938b41b4a2ae563" title="Evaluates the curve function. ">P521::eval()</a></td><td align="right">1503ms</td><td colspan="3">Raw curve evaluation </td></tr>
<tr>
<td><a class="el" href="classP521.html#ae04c439804f445535295bf44ae56afbf" title="Performs phase 1 of an ECDH key exchange using P-521. ">P521::dh1()</a></td><td align="right">1503ms</td><td colspan="3">First half of Diffie-Hellman key agreement </td></tr>
<tr>
<td><a class="el" href="classP521.html#a7b9d4f74cc2d71a488a33ab165537491" title="Performs phase 2 of an ECDH key exchange using P-521. ">P521::dh2()</a></td><td align="right">1503ms</td><td colspan="3">Second half of Diffie-Hellman key agreement </td></tr>
<tr>
<td><a class="el" href="classP521.html#ab050ceff65e49b646b8157fe1474288a" title="Signs a message using a specific P-521 private key. ">P521::sign()</a></td><td align="right">1860ms</td><td colspan="3">Digital signature generation </td></tr>
<tr>
<td><a class="el" href="classP521.html#ab075909f5cecbb801c6b7c41f20de223" title="Verifies a signature using a specific P-521 public key. ">P521::verify()</a></td><td align="right">3423ms</td><td colspan="3">Digital signature verification </td></tr>
<tr>
<td><a class="el" href="classP521.html#a15ca802e298c7ff3be06924b0edb7daa" title="Derives the public key from a private key for P-521 signing operations. ">P521::derivePublicKey()</a></td><td align="right">1503ms</td><td colspan="3">Derive a public key from a private key </td></tr>
<tr>
<td><a class="el" href="classNewHope.html#a335b17b40949f66aa579d1035384662c" title="Generates the key pair for Alice in a New Hope key exchange. ">NewHope::keygen()</a>, Ref</td><td align="right">29ms</td><td colspan="3">Generate key pair for Alice, Ref version </td></tr>
<tr>
<td><a class="el" href="classNewHope.html#a2f09529f5f73cf9763c28b58b13bbd14" title="Generates the public key and shared secret for Bob. ">NewHope::sharedb()</a>, Ref</td><td align="right">41ms</td><td colspan="3">Generate shared secret and public key for Bob, Ref version </td></tr>
<tr>
<td><a class="el" href="classNewHope.html#ac8128e0799fe74a6c69c541e0d6bd66e" title="Generates the shared secret for Alice. ">NewHope::shareda()</a>, Ref</td><td align="right">9ms</td><td colspan="3">Generate shared secret for Alice, Ref version </td></tr>
<tr>
<td><a class="el" href="classNewHope.html#a335b17b40949f66aa579d1035384662c" title="Generates the key pair for Alice in a New Hope key exchange. ">NewHope::keygen()</a>, Torref</td><td align="right">42ms</td><td colspan="3">Generate key pair for Alice, Torref version </td></tr>
<tr>
<td><a class="el" href="classNewHope.html#a2f09529f5f73cf9763c28b58b13bbd14" title="Generates the public key and shared secret for Bob. ">NewHope::sharedb()</a>, Torref</td><td align="right">53ms</td><td colspan="3">Generate shared secret and public key for Bob, Torref version </td></tr>
<tr>
<td><a class="el" href="classNewHope.html#ac8128e0799fe74a6c69c541e0d6bd66e" title="Generates the shared secret for Alice. ">NewHope::shareda()</a>, Torref</td><td align="right">9ms</td><td colspan="3">Generate shared secret for Alice, Torref version </td></tr>
</table>
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