sha3_224.cpp

#include "sha3_224.hpp"
#include <cassert>

// This example attempts to show how to use 2-to-1 SHA3-224 hash function !
int
main(int argc, char** argv)
{
  // $ python3
  // >>> a = [0xff] * 28
  //
  // first input digest
  constexpr sycl::uchar digest_0[28] = {
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
  };

  // >>> b = [0x0f] * 28
  //
  // second input digest
  constexpr sycl::uchar digest_1[28] = {
    15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
    15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
  };

  // >>> c = a + b
  // >>> import hashlib
  // >>> list(hashlib.sha3_224(bytes(c)).digest())
  //
  // final output digest after merging two input digests
  constexpr sycl::uchar digest_2[28] = { 248, 78,  65,  145, 150, 163, 134,
                                         170, 248, 171, 53,  130, 25,  148,
                                         39,  171, 106, 173, 59,  81,  105,
                                         249, 104, 41,  206, 226, 62,  243 };

  sycl::default_selector s{};
  sycl::device d{ s };
  sycl::context c{ d };
  sycl::queue q{ c, d };

  // so that input digests can be transferred from host to device ( by runtime )
  sycl::uchar* in = static_cast<sycl::uchar*>(
    sycl::malloc_shared(sizeof(digest_0) + sizeof(digest_1), q));

  // so that output digest can be transferred from device to host ( by runtime )
  sycl::uchar* out =
    static_cast<sycl::uchar*>(sycl::malloc_shared(sizeof(digest_2), q));

  // copy both input digests to device memory
  q.memcpy(in + 0, digest_0, sizeof(digest_0)).wait();
  q.memcpy(in + sizeof(digest_0), digest_1, sizeof(digest_1)).wait();

  // compute 2-to-1 hash
  q.single_task<class kernelExampleSHA3_224>(
    [=]() { sha3_224::hash(in, out); });
  q.wait();

  // finally assert !
  for (size_t i = 0; i < sizeof(digest_2); i++) {
    assert(*(out + i) == digest_2[i]);
  }

  // deallocate resources !
  sycl::free(in, q);
  sycl::free(out, q);

  return EXIT_SUCCESS;
}