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https://github.com/bitcoin-core/ctaes
Simple constant-time AES implementation
https://github.com/bitcoin-core/ctaes
aes cryptography encryption-library
Last synced: 8 days ago
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Simple constant-time AES implementation
- Host: GitHub
- URL: https://github.com/bitcoin-core/ctaes
- Owner: bitcoin-core
- License: mit
- Created: 2016-03-26T14:48:55.000Z (over 8 years ago)
- Default Branch: master
- Last Pushed: 2021-12-08T12:53:40.000Z (almost 3 years ago)
- Last Synced: 2024-05-08T20:27:44.773Z (6 months ago)
- Topics: aes, cryptography, encryption-library
- Language: C
- Homepage:
- Size: 44.9 KB
- Stars: 104
- Watchers: 20
- Forks: 40
- Open Issues: 2
-
Metadata Files:
- Readme: README.md
- License: COPYING
Awesome Lists containing this project
README
ctaes
=====
Simple C module for constant-time AES encryption and decryption.
Features:
* Simple, pure C code without any dependencies.
* No tables or data-dependent branches whatsoever, but using bit sliced approach from https://eprint.iacr.org/2009/129.pdf.
* Very small object code: slightly over 4k of executable code when compiled with -Os.
* Slower than implementations based on precomputed tables or specialized instructions, but can do ~15 MB/s on modern CPUs.
Performance
-----------
Compiled with GCC 5.3.1 with -O3, on an Intel(R) Core(TM) i7-4800MQ CPU, numbers in CPU cycles:
| Algorithm | Key schedule | Encryption per byte | Decryption per byte |
| --------- | ------------:| -------------------:| -------------------:|
| AES-128 | 2.8k | 154 | 161 |
| AES-192 | 3.1k | 169 | 181 |
| AES-256 | 4.0k | 191 | 203 |
Build steps
-----------
Object code:
$ gcc -O3 ctaes.c -c -o ctaes.o
Tests:
$ gcc -O3 ctaes.c test.c -o test
Benchmark:
$ gcc -O3 ctaes.c bench.c -o bench
Review
------
Results of a formal review of the code can be found in http://bitcoin.sipa.be/ctaes/review.zip