[MSEide-MSEgui-talk] Is it possible to produce SHA256 digest with MSEgui ?

2012-07-06 Thread IvankoB 
Like echo qwerty -n | sha256sum | awk '{print $1}' or echo -n qwerty |  
openssl dgst -sha256 do.


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Re: [MSEide-MSEgui-talk] Is it possible to produce SHA256 digest with MSEgui ?

2012-07-06 Thread IvankoB 
 Like echo qwerty -n | sha256sum | awk '{print $1}' or echo -n qwerty  
 |
 openssl dgst -sha256 do.

 Not yet. Use the EVP_Digest*() functions.




 From the OPENSL docs:

//-

New applications should use the SHA2 digest algorithms such as SHA256. The  
other digest algorithms are still in common use.

  For most applications the impl parameter to EVP_DigestInit_ex() will be  
set to NULL to use the default digest implementation.

  The functions EVP_DigestInit(), EVP_DigestFinal() and EVP_MD_CTX_copy()  
are obsolete but are retained to maintain compatibility with existing  
code. New applications should use EVP_DigestInit_ex(),  
EVP_DigestFinal_ex() and EVP_MD_CTX_copy_ex() because they can efficiently  
reuse a digest context instead of initializing and cleaning it up on each  
call and allow non default implementations of digests to be specified.

  In OpenSSL 0.9.7 and later if digest contexts are not cleaned up after  
use memory leaks will occur.
//-


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Re: [MSEide-MSEgui-talk] Is it possible to produce SHA256 digest with MSEgui ?

2012-07-06 Thread Ivanko B 
Opps, some bugs to fix :

//-

function ptr2digest(const adigestname: ansistring; const adata: pointer;
const asize: cardinal):ansistring;
var
   ctx:pEVP_MD_CTX;
   digest: pEVP_MD;
   md_len: integer;
begin
   md_len:= 0;
   ctx:= pointer(EVP_MD_CTX_create);
   digest:= evp_get_digestbyname(pchar(adigestname));
   if digest = nil then raise essl.create('Нет такого дайджеста: ' +
adigestname);
   try
 EVP_DigestInit(ctx, digest);
 EVP_DigestUpdate(ctx, adata, asize {--size of adata--} );
 setlength(result,EVP_MAX_MD_SIZE);
 EVP_DigestFinal(ctx, pcuchar(@result[1]), md_len);
   finally
 EVP_MD_CTX_destroy(ctx);
 setlength(result,md_len);
   end;
end;

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