From 13d0f55865f8b1b851ce1e84597b144c5fd41662 Mon Sep 17 00:00:00 2001 From: Rob Austein Date: Sun, 13 Sep 2020 23:15:43 +0000 Subject: GC --- .../GitRepositories%2Fcore%2Fhash%2Fsha256.md | 183 --------------------- 1 file changed, 183 deletions(-) delete mode 100644 raw-wiki-dump/GitRepositories%2Fcore%2Fhash%2Fsha256.md (limited to 'raw-wiki-dump/GitRepositories%2Fcore%2Fhash%2Fsha256.md') diff --git a/raw-wiki-dump/GitRepositories%2Fcore%2Fhash%2Fsha256.md b/raw-wiki-dump/GitRepositories%2Fcore%2Fhash%2Fsha256.md deleted file mode 100644 index a07b476..0000000 --- a/raw-wiki-dump/GitRepositories%2Fcore%2Fhash%2Fsha256.md +++ /dev/null @@ -1,183 +0,0 @@ -``` -#!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 -

sha256

- -

Hardware implementation of the SHA-256 cryptographic hash function. The -implementation is written in Verilog 2001 compliant code. The -implementation includes a core and a wrapper that provides a 32-bit -interface for simple integration. There is also an alternative wrapper -that implements a Wishbone compliant interface.

- -

This is a low area implementation that iterates over the rounds but -there is no sharing of operations such as adders.

- -

The hardware implementation is complemented by a functional model -written in Python.

- -

Implementation details

- -

The sha256 is divided into the following sections.

- - - -

The actual core consists of the following files:

- - - -

The top level entity is called sha256_core. This entity has wide -interfaces (512 bit block input, 256 bit digest). In order to make it -usable you probably want to wrap the core with a bus interface.

- -

Unless you want to provide your own interface you therefore also need to -select one top level wrapper. There are two wrappers provided:

- - - -

Do not include both wrappers in the same project.

- -

The core (sha256_core) will sample all data inputs when given the init -or next signal. the wrappers provided contains additional data -registers. This allows you to load a new block while the core is -processing the previous block.

- -

The W-memory scheduler is based on 16 32-bit registers. Thee registers -are loaded with the current block. After 16 rounds the contents of the -registers slide through the registers r5..r0 while the new W word is -inserted at r15 as well as being returned to the core.

- -

FPGA-results

- -

Altera Cyclone FPGAs

- -

Implementation results using Altera Quartus-II 13.1.

- -

Cyclone IV E

- - - -

Cyclone IV GX

- - - -

Cyclone V

- - - -

Xilinx Artix-7 FPGAs

- -

Implementation results using Xilinx ISE 14.7 -This implementation includes pipeline regsisters.

- - - -

TODO

- - - -

Status

- -

(2016-05-31)

- -

The core now supports both sha224 and sha256 modes. The default mode is -sha256.

- -

NOTE: The mode bit is located in the ADDR_CTRL API register and this -means that when writing to this register to start processing a block, -care must be taken to set the mode bit to the intended mode. This means -that old code that for example simply wrote 0x01 to initiate SHA256 -processing will now initiate SHA224 processing. Writing 0x05 will -now initiate SHA256 processing.

- -

The API version has been bumped a major number to reflect this change.

- -

Regarding SHA224, it is up to the user to only read seven, not eight -words from the digest registers. The core will update the LSW too.

- -

(2013-02-23)

- -

Cleanup, more results etc. Move all wmem update logic to a separate -process for a cleaner code.

- -

(2014-02-22)

- -

Redesigned the W-memory into a sliding window solution. This not only -removed 48 32-registers but also several muxes and address decoders.

- -

The old implementation resources and performance:

- - - -

The new implementation resources and performance:

- - - -

(2014-02-19) -- The core has been added to the Cryptech repo. The core comes from - https://github.com/secworks/sha256

-``` - -[[RepositoryIndex(format=table,glob=core/hash/sha256)]] - -| Clone `https://git.cryptech.is/core/hash/sha256.git` | -|---| -- cgit v1.2.3