As i know,RSA module mainly depends BN,ASN1,RAND(ASN1 may need other module
such as stack,buf).
ASN1 is a small parser to parse the asn1 strings,which is a little big to you.
if you do not use i2d_PublicKey ,d2i_xxx, you may not even need the ASN1 module.
SHA is a independent module,which needs a file in "crypto" folder --
md32_common.h.
So you can customize the source by your self.
Choose the functions in rsa.h,which you need. For the rsa implemenetation , i
guess you need to keep the "rsa_eay.c,rsa_sign.c,rsa_pk1.c".
When rsa sign , it works for two steps.Firstly, do the digest(which type is
passed by function's "type" param).I think you may not need all digest type,
so i think you can do the digest opertion yourself.
Secondly, do the private encrypt operation(this call the method in
rsa_eay.c).You can keey these codes.
When rsa verify, it just like the "rsa sign".
At 2011-01-21 19:24:47，"Muneeswaran Raju" <hieswar...@gmail.com> wrote:
Hi,
I tried the option. Also I used [ invoked ] only RSA private/puplic key
generation, RSA sign/verification, SHA256, SHA1 digest. But still I get huge
final image size in linux-X86 platform. I want to use memory very optimum.
Probably i have only 50KB-100KB for my image size.
Please find below the current size description
bash-3.2$ size openssssl
text data bss dec hex filename
697051 4808 12256 714115 ae583 openssssl
Please provide your suggestion on the same.
Thanks
Muneeswaran.R
2011/1/17 lzyzizi<lzyz...@126.com>
you can add the marco flag when you make the openssl project.
for example, let's say you do not want to add DSA module into your lib,then
make -DOPENSSL_NO_DSA
with this flag, all source code about DSA is exclude from your lib.
I saw some doc with these flags(OPENSSL_NO_XXX),but i fogot where i saw
them...you can also reference the openssl headers("include" to get more details)
At 2011-01-17 15:50:57，"Muneeswaran Raju" <hieswar...@gmail.com> wrote:
Hi,
I need to use RSA keygeneration, signing, SHA1 hash. But I have very less
memory avaialable. what is the way to remove unnecessary modules to get added
into libraries/final image.
Thanks
Muneeswaran.R
