c# - Getting HMACSHA1 correctly on iPhone using openssl -

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argh, head hurts!

context

i need write c/objective-c code decrypt files stored on remote server. encryption open-source , written in c#

i'm using libssl.a , libcrypto.a project;

https://github.com/x2on/openssl-for-iphone

my first hurdle getting hmacsha1 of string correct :( sha1 seems correct according reference site here - http://hash.online-convert.com/sha1-generator hmac not. ok, code;

nsstring *input = @"wombats";  // define strings etc need  unsigned char *instrg = malloc(256);     instrg = (unsigned char *)[input utf8string]; unsigned long lngth = [input length]; unsigned char result [evp_max_md_size]; unsigned char hmacresult [evp_max_md_size];  unsigned char newpassphrase[25]; memset(newpassphrase, 0, 25);  unsigned char salt[]  = "\x01\x02\x03\x04\x05\x06\x07\x08";  // real code requires re-hash input 1000 times. lets // check 10 (hey first wrong).   (int i=0; i<10; i++) {  // use openssl  sha_ctx shacontext; sha1_init(&shacontext);      sha1_update(&shacontext, instrg, lngth ); sha1_final(result, &shacontext);  unsigned int len;  // if @ result now, matches reference, think next stage goes wrong.  hmac(evp_sha1(),salt,8,result,20,hmacresult,&len);  printf("hmac ----------------- : "); hexprint(hmacresult,len);  // copy result input can re-hash;  lngth = len; memcpy((char *)instrg,(char *)hmacresult,len);  }

the code trying match following c# fragment. code generates correct output , extract production server.

 byte[] salt={0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8};  utf8encoding utf8 = new utf8encoding();   byte[] data = utf8.getbytes("wombats");   hmacsha1 sha1= new hmacsha1();  sha1.key = salt;   for(int i=0; i<10; i++)  {     sha1.computehash(data);     data = sha1.hash;     console.writeline(system.bitconverter.tostring(data));  }

if compile , run c# code, output following sequence;

dc-f3-1c-c1-2f-8a-86-16-cc-74-1e-da-25-7b-ff-16-6e-eb-2a-0f e7-6a-f4-c6-73-07-db-e8-52-82-9e-d1-96-bf-06-95-85-c6-94-f4 1f-e2-61-bc-f0-08-92-3c-14-70-2b-89-eb-46-c9-20-a5-90-65-9b etc

if @ output iphone version, following;

44-35-5b-bb-41-0e-bc-c3-d3-58-62-e6-5c-a0-51-6b-bc-97-11-f6 4c-3b-61-bd-1f-f7-72-13-af-1b-5e-5e-e3-70-8a-31-08-11-67-f2 41-56-8d-41-c1-3e-02-d0-d2-76-ad-d3-49-ba-71-ff-34-d7-3e-8b etc

so there wrong.

if check sha1 part, seems correct, i'm guessing either i'm using hmac wrong parameters, or c# hmacsha1 different expectations.

i should add if use suitable ascii salt, result of online generator here http://hash.online-convert.com/sha1-generator matches c# code leads me suspect c on iphone wrong.

can assist me working out problem is, i'm running out of ideas @ moment!

removing duplicate sha1 fixes it. doh!

sha_ctx shacontext; sha1_init(&shacontext);      sha1_update(&shacontext, instrg, lngth ); sha1_final(result, &shacontext);

delete of this.


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