Hi
I have a problem
I'm trying to hash a string "abc" with function RIPEMD160, but my
hash_value is not correct
My code is:
string s=”abc”;
int a = (s.size()+1)%64;
int b = 56-a+((a>56)?64:0); PADDING
int tot = a+b+8;
char * testo=new char [tot];
for(int j=0; j<a-1; j++)
testo[j]=s.c_str()[j];
for(int j=a-1; j<tot; j++)
testo[j]=0;
cout<<"adding bits 1000 0000"<<endl;
testo[a-1]= 128; //byte 10000000
unsigned long long sl = s.size()*8;
testo[a+b] = (sl & 0xFF); //Unicode little-endian
testo[a+b+1] = (sl>>8 & 0xFF);
testo[a+b+2] = (sl>>16 & 0xFF);
testo[a+b+3] = (sl>>24 & 0xFF);
testo[a+b+4] = (sl>>32 & 0xFF);
testo[a+b+5] = (sl>>40 & 0xFF);
testo[a+b+6] = (sl>>48 & 0xFF);
testo[a+b+7] = (sl>>56 & 0xFF);
RIPEMD160 hash;
word32 *digest= new word32 [5];
hash.InitState(digest);
for(int j=0; j<tot; j+=64)
{
hash.Transform(digest,(const word32 *)(&(testo[j])));
}
cout<<"The hash value is: "<<endl;
for(int j=0; j<5; j++)
cout<<std::hex<<digest[j];
cout<<endl;
Where is the problem?
Please help me,this is a project for an university exam
Thanks a lot
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