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SHA1withRSA - how to do that in 2 steps?

843811Nov 20 2008 — edited Nov 21 2008
Hi!

I know it might seem to be a newbie question, but I would really like to get that. I have my certificate and private key. Now I want to sign some data. First I did that with 
Signature s = Signature.getInstance("SHA1withRSA", sunRSA); // SunRSASign as provider
and I got some results. Now I would like to do the same (and get the same results) but doing that in 2 phases (as ideally I would like to create signing server and would like to send only hashes of messages there) and so I did something like:
MessageDigest digest = MessageDigest.getInstance("SHA-1");
and hashed my data and then I played with
c = Cipher.getInstance("RSA/ECB/PKCS1PADDING", sun);
c = Cipher.getInstance("RSA/ECB/NOPADDING", sun);
and some others settings but never get the same result. Could someone explain to me what SHA1withRSA is actually equivalent to?

Hope to get some help from you!

Cheers!

Comments

621707
Actually that was my mistake....
I specified the wrong clause.

oracle@NOBASE-oracle:~> imp system/manager@ora01 file=/home/oracle/FULL_EXP_BACKUP/imp_pipe log=/home/oracle/FULL_EXP_BACKUP/FullDbexp_20090302_0136.log FROMUSER=NOBASE,GBADM00301,NOBASEXML,DUMMYCONNECT,SPOTLIGHT2,SPOTLIGHT,SPOT1,TIMEREG,TDCH,ERWIN,IX,MTSSYS TOUSER=NOBASE,GBADM00301,NOBASEXML,DUMMYCONNECT,SPOTLIGHT2,SPOTLIGHT,SPOT1,TIMEREG,TDCH,ERWIN,IX,MTSSYS

Import: Release 10.2.0.1.0 - Production on Wed Mar 4 22:22:10 2009

Copyright (c) 1982, 2005, Oracle. All rights reserved.


Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options

Cannot proceed from last 25 minutes

My /home/oracle/FULL_EXP_BACKUP/FullDbexp_20090302_0136.dmp.gz file is of 17G
Why is it so?

Please help

Edited by: user618704 on Mar 4, 2009 10:39 PM

Edited by: user618704 on Mar 4, 2009 10:41 PM
Anand...
HI..

The file to be imported i suppose is FILE=/home/oracle/FULL_EXP_BACKUP/FullDbexp_20090302_0136.dmp.gz and when it will be unzipped the file name will be */home/oracle/FULL_EXP_BACKUP/FullDbexp_20090302_0136.dmp* until unless not altered.

SO,where does file=/home/oracle/FULL_EXP_BACKUP/imp_pipe comes from. Which file is imp_pipe.I think your imp command must be

oracle@globase-oracle:~> imp system/manager@ora01 file=/home/oracle/FULL_EXP_BACKUP/FullDbexp_20090302_0136.dmp log=/home/oracle/FULL_EXP_BACKUP/FullDbexp_20090302_0136_imp.log FROMUSER=GLOBASE,GBADM00301,GLOBASEXML,DUMMYCONNECT,SPOTLIGHT2,SPOTLIGHT,SPOT1,TIMEREG,TDCH,ERWIN,IX,MTSSYS TOUSER=GLOBASE,GBADM00301,GLOBASEXML,DUMMYCONNECT,SPOTLIGHT2,SPOTLIGHT,SPOT1,TIMEREG,TDCH,ERWIN feedback=100000 buffer=30000000 ignore=y


HTH
Anand
621707
I used below script on new terminal and it works :)

mknod /home/oracle/FULL_EXP_BACKUP/imp_pipe p
gunzip < /home/oracle/FULL_EXP_BACKUP/FullDbexp_20090302_0136.dmp.gz > /home/oracle/FULL_EXP_BACKUP/imp_pipe &
imp system/manager@ora01 file=/home/oracle/FULL_EXP_BACKUP/imp_pipe log=/home/oracle/FULL_EXP_BACKUP/FullDbexp_20090302_0136.log FROMUSER=NOBASE,GBADM00301,NOBASEXML,DUMMYCONNECT,SPOTLIGHT2,SPOTLIGHT,SPOT1,TIMEREG,TDCH,ERWIN,IX,MTSSYS TOUSER=NOBASE,GBADM00301,NOBASEXML,DUMMYCONNECT,SPOTLIGHT2,SPOTLIGHT,SPOT1,TIMEREG,TDCH,ERWIN,IX,MTSSYS


Thanks
Maran Viswarayar
Anand

This is compression on the fly in unix, You have to create a pipe and it will be redirected to write in a compressed format .Z or GZ where by the resultant dump will be in the compressed format at the end of export.

Similialy you have import using the same
Maran Viswarayar
Metalink 274109.1 has something for you

try deleting and recreate the pipe
Anand...
Hey Maran,

Thanks a lot for the info... :) I haven't worked much on unix platform.But it was nice to know this.Just wanted to clarify that is it redirected automatically to write in a compressed format.

Thanks
Anand
Maran Viswarayar
mknod /home/oracle/FULL_EXP_BACKUP/imp_pipe p
This creates the pipe
gunzip < /home/oracle/FULL_EXP_BACKUP/FullDbexp_20090302_0136.dmp.gz > /home/oracle/FULL_EXP_BACKUP/imp_pipe &
This (>) redirects the output to FullDbexp_20090302_0136.dmp.gz file with gunzip

Best Regards
Maran
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Locked on Dec 19 2008
Added on Nov 20 2008
#cryptography
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