md5.cu

#include <stdio.h>
#include <cuda.h>
#include "main.h"

#define UINT4 uint

extern __shared__ unsigned int words[];			// shared memory where hash will be stored
__constant__ unsigned int target_hash[4];		// constant has we will be searching for

__device__ unsigned int *format_shared_memory(unsigned int thread_id, unsigned int *memory) {
unsigned int *shared_memory;
unsigned int *global_memory;
int x;

	// we need to get a pointer to our shared memory portion

	shared_memory = &words[threadIdx.x * 16];
	global_memory = &memory[thread_id * 16];

	for(x=0; x < 16; x++) {
		shared_memory[x] = global_memory[x];
	}

	return shared_memory;
}

/* F, G and H are basic MD5 functions: selection, majority, parity */

#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z))) 

/* ROTATE_LEFT rotates x left n bits */
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4 */
/* Rotation is separate from addition to prevent recomputation */
#define FF(a, b, c, d, x, s, ac) \
  {(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
   (a) = ROTATE_LEFT ((a), (s)); \
   (a) += (b); \
  }

#define GG(a, b, c, d, x, s, ac) \
  {(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
   (a) = ROTATE_LEFT ((a), (s)); \
   (a) += (b); \
  }

#define HH(a, b, c, d, x, s, ac) \
  {(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
   (a) = ROTATE_LEFT ((a), (s)); \
   (a) += (b); \
  }

#define II(a, b, c, d, x, s, ac) \
  {(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
   (a) = ROTATE_LEFT ((a), (s)); \
   (a) += (b); \
  }

__device__ void md5(uint *in, uint *hash) {
uint a, b, c, d;

const uint a0 = 0x67452301;
const uint b0 = 0xEFCDAB89;
const uint c0 = 0x98BADCFE;
const uint d0 = 0x10325476;

	a = a0;
	b = b0;
	c = c0;
	d = d0;

  /* Round 1 */
#define S11 7
#define S12 12
#define S13 17
#define S14 22
  FF ( a, b, c, d, in[ 0], S11, 3614090360); /* 1 */
  FF ( d, a, b, c, in[ 1], S12, 3905402710); /* 2 */
  FF ( c, d, a, b, in[ 2], S13,  606105819); /* 3 */
  FF ( b, c, d, a, in[ 3], S14, 3250441966); /* 4 */
  FF ( a, b, c, d, in[ 4], S11, 4118548399); /* 5 */
  FF ( d, a, b, c, in[ 5], S12, 1200080426); /* 6 */
  FF ( c, d, a, b, in[ 6], S13, 2821735955); /* 7 */
  FF ( b, c, d, a, in[ 7], S14, 4249261313); /* 8 */
  FF ( a, b, c, d, in[ 8], S11, 1770035416); /* 9 */
  FF ( d, a, b, c, in[ 9], S12, 2336552879); /* 10 */
  FF ( c, d, a, b, in[10], S13, 4294925233); /* 11 */
  FF ( b, c, d, a, in[11], S14, 2304563134); /* 12 */
  FF ( a, b, c, d, in[12], S11, 1804603682); /* 13 */
  FF ( d, a, b, c, in[13], S12, 4254626195); /* 14 */
  FF ( c, d, a, b, in[14], S13, 2792965006); /* 15 */
  FF ( b, c, d, a, in[15], S14, 1236535329); /* 16 */

  /* Round 2 */
#define S21 5
#define S22 9
#define S23 14
#define S24 20
  GG ( a, b, c, d, in[ 1], S21, 4129170786); /* 17 */
  GG ( d, a, b, c, in[ 6], S22, 3225465664); /* 18 */
  GG ( c, d, a, b, in[11], S23,  643717713); /* 19 */
  GG ( b, c, d, a, in[ 0], S24, 3921069994); /* 20 */
  GG ( a, b, c, d, in[ 5], S21, 3593408605); /* 21 */
  GG ( d, a, b, c, in[10], S22,   38016083); /* 22 */
  GG ( c, d, a, b, in[15], S23, 3634488961); /* 23 */
  GG ( b, c, d, a, in[ 4], S24, 3889429448); /* 24 */
  GG ( a, b, c, d, in[ 9], S21,  568446438); /* 25 */
  GG ( d, a, b, c, in[14], S22, 3275163606); /* 26 */
  GG ( c, d, a, b, in[ 3], S23, 4107603335); /* 27 */
  GG ( b, c, d, a, in[ 8], S24, 1163531501); /* 28 */
  GG ( a, b, c, d, in[13], S21, 2850285829); /* 29 */
  GG ( d, a, b, c, in[ 2], S22, 4243563512); /* 30 */
  GG ( c, d, a, b, in[ 7], S23, 1735328473); /* 31 */
  GG ( b, c, d, a, in[12], S24, 2368359562); /* 32 */

  /* Round 3 */
#define S31 4
#define S32 11
#define S33 16
#define S34 23
  HH ( a, b, c, d, in[ 5], S31, 4294588738); /* 33 */
  HH ( d, a, b, c, in[ 8], S32, 2272392833); /* 34 */
  HH ( c, d, a, b, in[11], S33, 1839030562); /* 35 */
  HH ( b, c, d, a, in[14], S34, 4259657740); /* 36 */
  HH ( a, b, c, d, in[ 1], S31, 2763975236); /* 37 */
  HH ( d, a, b, c, in[ 4], S32, 1272893353); /* 38 */
  HH ( c, d, a, b, in[ 7], S33, 4139469664); /* 39 */
  HH ( b, c, d, a, in[10], S34, 3200236656); /* 40 */
  HH ( a, b, c, d, in[13], S31,  681279174); /* 41 */
  HH ( d, a, b, c, in[ 0], S32, 3936430074); /* 42 */
  HH ( c, d, a, b, in[ 3], S33, 3572445317); /* 43 */
  HH ( b, c, d, a, in[ 6], S34,   76029189); /* 44 */
  HH ( a, b, c, d, in[ 9], S31, 3654602809); /* 45 */
  HH ( d, a, b, c, in[12], S32, 3873151461); /* 46 */
  HH ( c, d, a, b, in[15], S33,  530742520); /* 47 */
  HH ( b, c, d, a, in[ 2], S34, 3299628645); /* 48 */

  /* Round 4 */
#define S41 6
#define S42 10
#define S43 15
#define S44 21
  II ( a, b, c, d, in[ 0], S41, 4096336452); /* 49 */
  II ( d, a, b, c, in[ 7], S42, 1126891415); /* 50 */
  II ( c, d, a, b, in[14], S43, 2878612391); /* 51 */
  II ( b, c, d, a, in[ 5], S44, 4237533241); /* 52 */
  II ( a, b, c, d, in[12], S41, 1700485571); /* 53 */
  II ( d, a, b, c, in[ 3], S42, 2399980690); /* 54 */
  II ( c, d, a, b, in[10], S43, 4293915773); /* 55 */
  II ( b, c, d, a, in[ 1], S44, 2240044497); /* 56 */
  II ( a, b, c, d, in[ 8], S41, 1873313359); /* 57 */
  II ( d, a, b, c, in[15], S42, 4264355552); /* 58 */
  II ( c, d, a, b, in[ 6], S43, 2734768916); /* 59 */
  II ( b, c, d, a, in[13], S44, 1309151649); /* 60 */
  II ( a, b, c, d, in[ 4], S41, 4149444226); /* 61 */
  II ( d, a, b, c, in[11], S42, 3174756917); /* 62 */
  II ( c, d, a, b, in[ 2], S43,  718787259); /* 63 */
  II ( b, c, d, a, in[ 9], S44, 3951481745); /* 64 */

	a += a0;
	b += b0;
	c += c0;
	d += d0;

	hash[0] = a;
	hash[1] = b;
	hash[2] = c;
	hash[3] = d;

	return;
}

__global__ void md5_cuda_calculate(void *memory, struct device_stats *stats, unsigned int *debug_memory) {
unsigned int id;
unsigned int *shared_memory;
uint hash[4];
int x;
	
	id = (blockIdx.x * blockDim.x) + threadIdx.x;		// get our thread unique ID in this run

	shared_memory = format_shared_memory(id, (unsigned int *)memory);

	#ifdef DEBUG
	// passes the computed hashes into debug memory
	for(x=0; x<4; x++) {
		debug_memory[(id * 4) + x] = (uint)shared_memory[x];
	}
	#endif

	md5(shared_memory, hash);	// actually calculate the MD5 hash

	if (hash[0] == target_hash[0] && hash[1] == target_hash[1] && hash[2] == target_hash[2] && hash[3] == target_hash[3]) {
		// !! WE HAVE A MATCH !!
		stats->hash_found = 1;

		for(x=0; x<64; x++) {
			// copy the matched word accross
			stats->word[x] = *(char *)((char *)shared_memory + x);
		}
	}
}

extern "C" void md5_calculate(struct cuda_device *device) {
cudaEvent_t start, stop;
float time;

	#ifdef GPU_BENCHMARK
	cudaEventCreate(&start);
	cudaEventCreate(&stop);

	cudaEventRecord(start, 0);
	cudaThreadSynchronize();
	#endif

	md5_cuda_calculate <<< device->max_blocks, device->max_threads, device->shared_memory >>> (device->device_global_memory, (struct device_stats *)device->device_stats_memory, (unsigned int *)device->device_debug_memory);

	#ifdef GPU_BENCHMARK
	cudaEventRecord(stop, 0);
	cudaEventSynchronize(stop);
	cudaEventElapsedTime(&time, start, stop);
	cudaEventDestroy(start);
	cudaEventDestroy(stop);
	printf("CUDA kernel took %fms to calculate %d x %d (%d) hashes\n", time, device->max_blocks, device->max_threads, device->max_blocks * device->max_threads);
	// print GPU stats here
	#endif

}