I have successfully implemented DTW in 'C' as applied to dynamic signature verification. I used a test data base of Chinese and Dutch signatures to verify EER and got very impressive results. It is currently implemented as a demo on an iPad. My algorithm was hand-coded from several published descriptions. I will share the code if there is a way to get it to you. One thing that also contributed to success was 'normalizing' the input data. This made it a lot easier when comparing disparate data using different sample rates.

Regards,
DJ