aboutsummaryrefslogtreecommitdiff
path: root/raw-wiki-dump/GitRepositories%2Fcore%2Fcipher%2Faes
diff options
context:
space:
mode:
authorRob Austein <sra@hactrn.net>2020-09-13 23:04:30 +0000
committerRob Austein <sra@hactrn.net>2020-09-13 23:04:30 +0000
commitb092ffbcbe2c9398494f7dc9db6f0796971633e0 (patch)
tree6fabf690f1ebf485a9fea9af5298e44ad2a59a3e /raw-wiki-dump/GitRepositories%2Fcore%2Fcipher%2Faes
parent9d927e49d9c10fc16c6dfa4a2a96cdb6216e4e2b (diff)
Import Cryptech wiki dump
Diffstat (limited to 'raw-wiki-dump/GitRepositories%2Fcore%2Fcipher%2Faes')
-rw-r--r--raw-wiki-dump/GitRepositories%2Fcore%2Fcipher%2Faes90
1 files changed, 90 insertions, 0 deletions
diff --git a/raw-wiki-dump/GitRepositories%2Fcore%2Fcipher%2Faes b/raw-wiki-dump/GitRepositories%2Fcore%2Fcipher%2Faes
new file mode 100644
index 0000000..b46c33c
--- /dev/null
+++ b/raw-wiki-dump/GitRepositories%2Fcore%2Fcipher%2Faes
@@ -0,0 +1,90 @@
+{{{
+#!htmlcomment
+
+This page is maintained automatically by a script. Don't modify this page by hand,
+your changes will just be overwritten the next time the script runs. Talk to your
+Friendly Neighborhood Repository Maintainer if you need to change something here.
+
+}}}
+
+{{{
+#!html
+<h1>aes_speed</h1>
+
+<p>Speed optimized Verilog implementation of the symmetric block cipher AES
+(Advanced Encryption Standard) as specified in the NIST document <a href="http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf">FIPS
+197</a>.</p>
+
+<p>This core is modified version of the Cryptech AES core. Note that the
+name of the core modules are identical to that core. The purpose of this
+is to allow a drop-in replacement in Cryptech designs.</p>
+
+<h2>Status</h2>
+
+<p>Second round of optimizations done. The core has been implemented in
+FPGA and tested in real HW.</p>
+
+<h2>Introduction</h2>
+
+<p>This implementation supports 128 and 256 bit keys. The
+implementation is iterative and process one 128 block at a time.</p>
+
+<p>The encipher and decipher block processing datapaths are separated and
+basically self contained given access to a set of round keys and a
+block. This makes it possible to hard wire either encipher or decipher
+and allow the build tools to optimize away the other functionality which
+will reduce the size to about 50%. For cipher modes such as CTR, GCM
+decryption in the AES core will never be used and thus the decipher
+block processing can be removed.</p>
+
+<p>The core has been equipped with 16 S-boxes for encipher and 16 Inverse
+S-boxes for decipher. This allows the core to perform the SubBytes and
+InverseSubBytes operations in the AES round functions in one cycle.</p>
+
+<p>The key expansion does not share S-boxes with the encipher datapath, so
+the total number of S-boxes is 40.</p>
+
+<h2>Performance comparison</h2>
+
+<p>Number of cycles for the old Cryptech AES core:</p>
+
+<ul>
+<li>AES-128 Encipher one block: 57</li>
+<li>AES-256 Decipher one block: 77</li>
+</ul>
+
+<p>Number of cycles for the Cryptech AES speed core:</p>
+
+<ul>
+<li>AES-128 Encipher one block: 16</li>
+<li>AES-255 Decipher one block: 20</li>
+</ul>
+
+<p>Note that these latency numbers are after key expansion. The given key
+must be expanded byt asserting the init control bit and wait for ready
+to be asserted. Key expansion takes about 10 to 14 cycles.</p>
+
+<h2>Implementation comparison</h2>
+
+<p>Implementation results for Xilinx Artix7-t200.</p>
+
+<p>Old Cryptech AES core:</p>
+
+<ul>
+<li>2094 slices</li>
+<li>2854 regs</li>
+<li>114 MHz (8.76ns)</li>
+</ul>
+
+<p>Cryptec AES speed core:</p>
+
+<ul>
+<li>2112 slices</li>
+<li>2984 regs</li>
+<li>116 MHz. (8.62ns)</li>
+</ul>
+}}}
+
+[[RepositoryIndex(format=table,glob=core/cipher/aes)]]
+
+|| Clone `https://git.cryptech.is/core/cipher/aes.git` ||