Update slow-hash.c

1. Various optimizations for faster hashing performance.

src/crypto/slow-hash.c

@@ -22,6 +22,9 @@ static void (*const extra_hashes[4])(const void *, size_t, char *) = {
 #define INIT_SIZE_BLK   8
 #define INIT_SIZE_BYTE (INIT_SIZE_BLK * AES_BLOCK_SIZE)
 
+extern int aesb_single_round(const uint8_t *in, uint8_t*out, const uint8_t *expandedKey);
+extern int aesb_pseudo_round(const uint8_t *in, uint8_t *out, const uint8_t *expandedKey);
+
 static size_t e2i(const uint8_t* a, size_t count) { return (*((uint64_t*)a) / AES_BLOCK_SIZE) & (count - 1); }
 
 static void mul(const uint8_t* a, const uint8_t* b, uint8_t* res) {
@@ -47,19 +50,20 @@ static void sum_half_blocks(uint8_t* a, const uint8_t* b) {
   ((uint64_t*)a)[0] = SWAP64LE(a0);
   ((uint64_t*)a)[1] = SWAP64LE(a1);
 }
+#define U64(x) ((uint64_t *) (x))
 
 static void copy_block(uint8_t* dst, const uint8_t* src) {
   memcpy(dst, src, AES_BLOCK_SIZE);
 }
 
-static void swap_blocks(uint8_t* a, uint8_t* b) {
-  size_t i;
-  uint8_t t;
-  for (i = 0; i < AES_BLOCK_SIZE; i++) {
-    t = a[i];
-    a[i] = b[i];
-    b[i] = t;
-  }
+static void swap_blocks(uint8_t *a, uint8_t *b){
+	uint64_t t[2];
+	U64(t)[0] = U64(a)[0];
+	U64(t)[1] = U64(a)[1];
+	U64(a)[0] = U64(b)[0];
+	U64(a)[1] = U64(b)[1];
+	U64(b)[0] = U64(t)[0];
+	U64(b)[1] = U64(t)[1];
 }
 
 static void xor_blocks(uint8_t* a, const uint8_t* b) {
@@ -89,17 +93,17 @@ void cn_slow_hash(const void *data, size_t length, char *hash) {
   uint8_t d[AES_BLOCK_SIZE];
   size_t i, j;
   uint8_t aes_key[AES_KEY_SIZE];
-  OAES_CTX* aes_ctx;
+  oaes_ctx *aes_ctx;
 
   hash_process(&state.hs, data, length);
   memcpy(text, state.init, INIT_SIZE_BYTE);
   memcpy(aes_key, state.hs.b, AES_KEY_SIZE);
-  aes_ctx = oaes_alloc();
+  aes_ctx = (oaes_ctx *) oaes_alloc();
   
   oaes_key_import_data(aes_ctx, aes_key, AES_KEY_SIZE);
   for (i = 0; i < MEMORY / INIT_SIZE_BYTE; i++) {
     for (j = 0; j < INIT_SIZE_BLK; j++) {    
-      oaes_pseudo_encrypt_ecb(aes_ctx, &text[AES_BLOCK_SIZE * j]);
+		  aesb_pseudo_round(&text[AES_BLOCK_SIZE * j], &text[AES_BLOCK_SIZE * j], aes_ctx->key->exp_data);
     }
     memcpy(&long_state[i * INIT_SIZE_BYTE], text, INIT_SIZE_BYTE);
   }
@@ -117,7 +121,7 @@ void cn_slow_hash(const void *data, size_t length, char *hash) {
     /* Iteration 1 */
     j = e2i(a, MEMORY / AES_BLOCK_SIZE);
     copy_block(c, &long_state[j * AES_BLOCK_SIZE]);
-    oaes_encryption_round(a, c);
+	  aesb_single_round(c, c, a);
     xor_blocks(b, c);
     swap_blocks(b, c);
     copy_block(&long_state[j * AES_BLOCK_SIZE], c);
@@ -140,12 +144,12 @@ void cn_slow_hash(const void *data, size_t length, char *hash) {
   for (i = 0; i < MEMORY / INIT_SIZE_BYTE; i++) {
     for (j = 0; j < INIT_SIZE_BLK; j++) {
       xor_blocks(&text[j * AES_BLOCK_SIZE], &long_state[i * INIT_SIZE_BYTE + j * AES_BLOCK_SIZE]);
-      oaes_pseudo_encrypt_ecb(aes_ctx, &text[j * AES_BLOCK_SIZE]);
+	    aesb_pseudo_round(&text[AES_BLOCK_SIZE * j], &text[AES_BLOCK_SIZE * j], aes_ctx->key->exp_data);
     }
   }
   memcpy(state.init, text, INIT_SIZE_BYTE);
   hash_permutation(&state.hs);
   /*memcpy(hash, &state, 32);*/
   extra_hashes[state.hs.b[0] & 3](&state, 200, hash);
-  oaes_free(&aes_ctx);
+  oaes_free((OAES_CTX **) &aes_ctx);
 }