Talk:Cryptography Users Guide

Comments on Cryptography Users Guide

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Ayoub.zaki said ...

Hashing with HW acceleration seems to not work: I'm getting root@am37x-evm:/etc/openvpn# openssl dgst -sha1 file cryptodev_digest_final: digest failed

looking in the TI demos : cat ./usr/bin/openssl_gen_sha1hash.sh

1. !/bin/sh

DATAFILE=/home/root/rnddata

OPENSSL=/usr/bin/openssl

echo -e "\nGenerate SHA1 Hash"

if [ ! -r $DATAFILE ] then echo "Creating 10M random data file ($DATAFILE)" echo "Please Wait..." dd if=/dev/urandom of=$DATAFILE bs=1048576 count=10 fi

lsmod | grep ocf_omap3_cryptok >/dev/null if [ `echo $?` = "0" ] then rmmod ocf_omap3_cryptok fi

$OPENSSL dgst -sha1 $DATAFILE

So it's done without HW acceleration !

Any hints ?

Tx

--Ayoub.zaki 10:31, 16 January 2012 (CST)

Gregturne said ...

This is a known issue with the driver and the SHA hash function. Performing the hash on files bigger than about 60K will cause a crash. Without the driver installed the openssl software implentation will work on any file size. The issue is being worked, but I don't have a time frame for a solution right now.

--Gregturne 09:22, 8 February 2012 (CST)

Gregturne said ...

On the page that describes how to build OpenSSL, http://processors.wiki.ti.com/index.php/Build_OpenSSL_for_Sitara There is now a patch that will solve the problem of processing large files with SHA/MD5.

--Gregturne 13:28, 20 March 2012 (CDT)

Bsrinath said ...

Can anybody provide some pointers to any hardware documentation for AM335x that can be referred to in order to implement a crypto driver for OSes other than Linux.

--Bsrinath 23:36, 24 March 2013 (CDT)

Joelagnel said ...

Hello Bsrinath,

Please refer to the omap-sha/md5/aes kernel drivers provided with the SDK. A TRM is being worked on and should be available mid-year. Till then only code examples are available.

Also- refer to ocf_omap3_crpyto code for some examples on how to program the crypto hardware modules.

--Joelagnel 12:14, 28 March 2013 (CDT)