HiCrypt: C to CUDA Translator for Symmetric Block Ciphers

Many-core computer systems with GPUs are coming into mainstream use from high-end computing, including supercomputers, to embedded processors. Consequently, the implementation of cryptographic methods on GPGPU is also becoming popular because of such systems' performance. However, many factors affect the performance of GPUs. To cope with this problem, we developed a new translator, HiCrypt, which can generate an optimized CUDA program from a cipher program written in a standard C language with directives. Users need only annotate variables and an encoding/decoding function, which are characteristics of cipher programs, with directives. To evaluate HiCrypt, three representative cipher programs are translated into CUDA programs by HiCrypt translator prototype. Generated programs perform high throughput almost identical to hand optimized CUDA programs for all three cipher programs. HiCrypt will contribute to development of new and various symmetric block ciphers using a GPU accelerator.