The first parameter of CryptoPP::HashFilter is taken by non-const reference, so you shouldn't use a temporary RIPEMD160() within hashFilter's constructor.

  RIPEMD160 hash_transformation;
  HashFilter hashFilter(hash_transformation,new HexEncoder(new StringSink(strDigest),false));
  ...

Cheers,

Fraser.


On 25/04/2012 07:46, c++programmer wrote:

I ran the following code which was mostly copied from an example on the crypto++ page:
http://www.cryptopp.com/wiki/User_Guide:_cryptlib.h:


  string strDigest;
  HashFilter hashFilter(RIPEMD160(),new HexEncoder(new StringSink(strDigest),false));
  string test="1";
  hashFilter.Put((byte const*)test.data(),test.length());
  hashFilter.MessageEnd();
  cout << "hash is: " << strDigest <<endl;
I get the following:
hash is: b3dbc4177b11959e251e87e7abf8f86eeb3a93b3

Using an online hasher I get:
http://www.fileformat.info/tool/hash.htm?text=1
Which does not agree with the result from crypto++

Can anyone point out what I'm doing wrong?

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