SHA-224, SHA-256, SHA-384 and SHA-512
This is a fast software implementation in C of the FIPS 180-2 hash algorithms SHA-224, SHA-256, SHA-384 and SHA-512. The code is distributed under the BSD
license. For each algorithm the implementation has been verified with the NIST test vectors and with the additional vectors provided by Aaron D. Gifford.
News:
February 2, 2007: Add new optimizations and minor bug fix.
May 23, 2005: Include support of SHA-224.
April 30, 2005: First release.
Download:
sha2.tar.gz
github:
https://github.com/ouah/sha2
Users:
This SHA-2 version is used in Adobe AIR
(see license file), in Cisco ASA 5500 Series Software (license), in HP Compliance Log Warehouse (license), or in Yahoo! Foxytunes (license).
Compilation options:
There is an UNROLL_LOOPS option which is disabled by default. Depending on your system if the option is enabled the hash time can be faster but it can also
be slower.
Performances:
SHA-256 can achieve hashing at 27 cycles per byte for long size data on a Pentium 4 with the Intel compiler. Data lengths in the table below are in bytes and
values are in cycles/byte.
Arch: Pentium 4 (Prescott), compiler: icc 8.1, compiler options: -O2 -xP -ip, software options: -DUNROLL_LOOPS
| Data length |
1 |
10 |
100 |
1,000 |
10,000 |
100,000 |
| SHA-224 |
2120 |
212.8 |
41.20 |
27.80 |
26.56 |
26.66 |
| SHA-256 |
2128 |
212.0 |
41.20 |
27.79 |
26.59 |
26.71 |
| SHA-384 |
8056 |
807.2 |
80.56 |
60.89 |
59.12 |
58.44 |
| SHA-512 |
8088 |
808.0 |
82.00 |
60.71 |
59.20 |
58.51 |
Arch: Pentium 4 (Prescott), compiler: gcc 3.3.4, compiler options: -O3 -march=pentium4 -fomit-frame-pointer, software options: none
| Data length |
1 |
10 |
100 |
1,000 |
10,000 |
100,000 |
| SHA-224 |
2440 |
256.8 |
49.68 |
35.14 |
33.48 |
33.41 |
| SHA-256 |
2448 |
257.6 |
49.44 |
35.16 |
33.66 |
33.40 |
| SHA-384 |
16136 |
1626.4 |
162.40 |
126.40 |
123.95 |
122.70 |
| SHA-512 |
16160 |
1628.8 |
162.64 |
126.52 |
124.11 |
122.75 |
Portability:
The implementation has been tested on numerous UNIX systems and on both little endian and big endian platforms.
Olivier Gay - olivier.gay@a3.epfl.ch
Last updated: February 2, 2007