dons:
> -- Fast md5 using OpenSSL and non-copying bytestrings
> md5sum :: B.ByteString -> String
> md5sum p = unsafePerformIO $ B.unsafeUseAsCStringLen p $ \(ptr,n) -> do
> digest <- c_md5 ptr (fromIntegral n) nullPtr
> liftM concat $ forM [0..15] $ \n -> do
> w <- peekElemOff digest n
> return $ case showHex w [] of [x] -> ['0', x]; x
> -> x
>
> -- unsigned char *MD5(const unsigned char *d, unsigned long n, unsigned
> char *md);
> foreign import ccall "openssl/md5.h MD5" c_md5
> :: Ptr CChar -> CULong -> Ptr CChar -> IO (Ptr Word8)
>
> ByteStrings were designed for this zero-copy passing of big data to C,
> by the way, so its a perfect fit.
by the way, I note we do have a binding to OpenSSL, of sorts:
http://cryp.to/hopenssl/
But it needs updating to use ByteStrings. Would make a good project for
someone into crypto.
-- Don
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