Update slow-hash.c

1. Added huge pages support and optimized scratchpad twiddling. (credits to dga).
2. Added aes-ni key expansion support.
3. Minor speedup to scratchpad initialization/finalization.

1 files changed, 404 insertions, 118 deletions

diff --git a/src/crypto/slow-hash.c b/src/crypto/slow-hash.c
index c7264bd96..cda66af52 100644
--- a/src/crypto/slow-hash.c
+++ b/src/crypto/slow-hash.c
@@ -11,143 +11,429 @@
 #include "hash-ops.h"
 #include "oaes_lib.h"
 
-static void (*const extra_hashes[4])(const void *, size_t, char *) = {
-  hash_extra_blake, hash_extra_groestl, hash_extra_jh, hash_extra_skein
-};
+#include <emmintrin.h>
+
+#if defined(_MSC_VER)
+#include <intrin.h>
+#include <Windows.h>
+#define STATIC
+#define INLINE __inline
+#if !defined(RDATA_ALIGN16)
+#define RDATA_ALIGN16 __declspec(align(16))
+#endif
+#else
+#include <wmmintrin.h>
+#include <sys/mman.h>
+#define STATIC static
+#define INLINE inline
+#if !defined(RDATA_ALIGN16)
+#define RDATA_ALIGN16 __attribute__ ((aligned(16)))
+#endif
+#endif
+
+#if defined(__INTEL_COMPILER)
+#define ASM __asm__
+#elif !defined(_MSC_VER)
+#define ASM __asm__
+#else
+#define ASM __asm
+#endif
 
-#define MEMORY         (1 << 21) /* 2 MiB */
+#define MEMORY         (1 << 21) // 2MB scratchpad
 #define ITER           (1 << 20)
 #define AES_BLOCK_SIZE  16
-#define AES_KEY_SIZE    32 /*16*/
+#define AES_KEY_SIZE    32
 #define INIT_SIZE_BLK   8
 #define INIT_SIZE_BYTE (INIT_SIZE_BLK * AES_BLOCK_SIZE)
+#define TOTALBLOCKS (MEMORY / AES_BLOCK_SIZE)
+
+#define U64(x) ((uint64_t *) (x))
+#define R128(x) ((__m128i *) (x))
+#define SWAP(a, b) (((a) -= (b)), ((b) += (a)), ((a) = (b) - (a)))
+
+#define state_index(x) (((*((uint64_t *)x) >> 4) & (TOTALBLOCKS - 1)) << 4)
+#if defined(_MSC_VER)
+#define __mul() lo = _umul128(c[0], b[0], &hi);
+#else
+#define __mul() ASM("mulq %3\n\t" : "=d"(hi), "=a"(lo) : "%a" (c[0]), "rm" (b[0]) : "cc");
+#endif
 
-static size_t e2i(const uint8_t* a, size_t count) { return (*((uint64_t*)a) / AES_BLOCK_SIZE) & (count - 1); }
+#define pre_aes() \
+    j = state_index(a); \
+	_c = _mm_load_si128(R128(&hp_state[j])); \
+	_a = _mm_load_si128(R128(a)); \
+ 
+// dga's optimized scratchpad twiddling
+#define post_aes() \
+	_mm_store_si128(R128(c), _c); \
+	_b = _mm_xor_si128(_b, _c); \
+	_mm_store_si128(R128(&hp_state[j]), _b); \
+	j = state_index(c); \
+	p = U64(&hp_state[j]); \
+	b[0] = p[0]; b[1] = p[1]; \
+	__mul(); \
+	a[0] += hi; a[1] += lo; \
+	p = U64(&hp_state[j]); \
+	p[0] = a[0];  p[1] = a[1]; \
+	a[0] ^= b[0]; a[1] ^= b[1]; \
+	_b = _c; \
+ 
+#if defined(_MSC_VER)
+#define THREADV __declspec(thread)
+#else
+#define THREADV __thread
+#endif
 
-static void mul(const uint8_t* a, const uint8_t* b, uint8_t* res) {
-  uint64_t a0, b0;
-  uint64_t hi, lo;
+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);
+
+#pragma pack(push, 1)
+union cn_slow_hash_state
+{
+    union hash_state hs;
+    struct
+    {
+        uint8_t k[64];
+        uint8_t init[INIT_SIZE_BYTE];
+    };
+};
+#pragma pack(pop)
 
-  a0 = SWAP64LE(((uint64_t*)a)[0]);
-  b0 = SWAP64LE(((uint64_t*)b)[0]);
-  lo = mul128(a0, b0, &hi);
-  ((uint64_t*)res)[0] = SWAP64LE(hi);
-  ((uint64_t*)res)[1] = SWAP64LE(lo);
+THREADV uint8_t *hp_state = NULL;
+THREADV int hp_allocated = 0;
+
+#if defined(_MSC_VER)
+#define cpuid(info,x)    __cpuidex(info,x,0)
+#else
+void cpuid(int CPUInfo[4], int InfoType)
+{
+    ASM __volatile__
+    (
+    "cpuid":
+        "=a" (CPUInfo[0]),
+        "=b" (CPUInfo[1]),
+        "=c" (CPUInfo[2]),
+        "=d" (CPUInfo[3]) :
+            "a" (InfoType), "c" (0)
+        );
 }
+#endif
 
-static void sum_half_blocks(uint8_t* a, const uint8_t* b) {
-  uint64_t a0, a1, b0, b1;
-
-  a0 = SWAP64LE(((uint64_t*)a)[0]);
-  a1 = SWAP64LE(((uint64_t*)a)[1]);
-  b0 = SWAP64LE(((uint64_t*)b)[0]);
-  b1 = SWAP64LE(((uint64_t*)b)[1]);
-  a0 += b0;
-  a1 += b1;
-  ((uint64_t*)a)[0] = SWAP64LE(a0);
-  ((uint64_t*)a)[1] = SWAP64LE(a1);
+STATIC INLINE void xor_blocks(uint8_t *a, const uint8_t *b)
+{
+    U64(a)[0] ^= U64(b)[0];
+    U64(a)[1] ^= U64(b)[1];
 }
 
-static void copy_block(uint8_t* dst, const uint8_t* src) {
-  memcpy(dst, src, AES_BLOCK_SIZE);
+STATIC INLINE int check_aes_hw(void)
+{
+    int cpuid_results[4];
+    static int supported = -1;
+
+    if(supported >= 0)
+        return supported;
+
+    cpuid(cpuid_results,1);
+    return supported = cpuid_results[2] & (1 << 25);
 }
 
-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 INLINE void aes_256_assist1(__m128i* t1, __m128i * t2)
+{
+    __m128i t4;
+    *t2 = _mm_shuffle_epi32(*t2, 0xff);
+    t4 = _mm_slli_si128(*t1, 0x04);
+    *t1 = _mm_xor_si128(*t1, t4);
+    t4 = _mm_slli_si128(t4, 0x04);
+    *t1 = _mm_xor_si128(*t1, t4);
+    t4 = _mm_slli_si128(t4, 0x04);
+    *t1 = _mm_xor_si128(*t1, t4);
+    *t1 = _mm_xor_si128(*t1, *t2);
 }
 
-static void xor_blocks(uint8_t* a, const uint8_t* b) {
-  size_t i;
-  for (i = 0; i < AES_BLOCK_SIZE; i++) {
-    a[i] ^= b[i];
-  }
+STATIC INLINE void aes_256_assist2(__m128i* t1, __m128i * t3)
+{
+    __m128i t2, t4;
+    t4 = _mm_aeskeygenassist_si128(*t1, 0x00);
+    t2 = _mm_shuffle_epi32(t4, 0xaa);
+    t4 = _mm_slli_si128(*t3, 0x04);
+    *t3 = _mm_xor_si128(*t3, t4);
+    t4 = _mm_slli_si128(t4, 0x04);
+    *t3 = _mm_xor_si128(*t3, t4);
+    t4 = _mm_slli_si128(t4, 0x04);
+    *t3 = _mm_xor_si128(*t3, t4);
+    *t3 = _mm_xor_si128(*t3, t2);
 }
 
-#pragma pack(push, 1)
-union cn_slow_hash_state {
-  union hash_state hs;
-  struct {
-    uint8_t k[64];
-    uint8_t init[INIT_SIZE_BYTE];
-  };
-};
-#pragma pack(pop)
+STATIC INLINE void aes_expand_key(const uint8_t *key, uint8_t *expandedKey)
+{
+    __m128i *ek = R128(expandedKey);
+    __m128i t1, t2, t3;
+
+    t1 = _mm_loadu_si128(R128(key));
+    t3 = _mm_loadu_si128(R128(key + 16));
+
+    ek[0] = t1;
+    ek[1] = t3;
 
-void cn_slow_hash(const void *data, size_t length, char *hash) {
-  uint8_t long_state[MEMORY];
-  union cn_slow_hash_state state;
-  uint8_t text[INIT_SIZE_BYTE];
-  uint8_t a[AES_BLOCK_SIZE];
-  uint8_t b[AES_BLOCK_SIZE];
-  uint8_t c[AES_BLOCK_SIZE];
-  uint8_t d[AES_BLOCK_SIZE];
-  size_t i, j;
-  uint8_t aes_key[AES_KEY_SIZE];
-  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();
-  for (i = 0; i < MEMORY / INIT_SIZE_BYTE; i++) {
-    for (j = 0; j < INIT_SIZE_BLK; j++) {
-      oaes_key_import_data(aes_ctx, aes_key, AES_KEY_SIZE);
-      oaes_pseudo_encrypt_ecb(aes_ctx, &text[AES_BLOCK_SIZE * j]);
-      /*memcpy(aes_key, &text[AES_BLOCK_SIZE * j], AES_KEY_SIZE);*/
-      memcpy(aes_key, state.hs.b, AES_KEY_SIZE);
+    t2 = _mm_aeskeygenassist_si128(t3, 0x01);
+    aes_256_assist1(&t1, &t2);
+    ek[2] = t1;
+    aes_256_assist2(&t1, &t3);
+    ek[3] = t3;
+
+    t2 = _mm_aeskeygenassist_si128(t3, 0x02);
+    aes_256_assist1(&t1, &t2);
+    ek[4] = t1;
+    aes_256_assist2(&t1, &t3);
+    ek[5] = t3;
+
+    t2 = _mm_aeskeygenassist_si128(t3, 0x04);
+    aes_256_assist1(&t1, &t2);
+    ek[6] = t1;
+    aes_256_assist2(&t1, &t3);
+    ek[7] = t3;
+
+    t2 = _mm_aeskeygenassist_si128(t3, 0x08);
+    aes_256_assist1(&t1, &t2);
+    ek[8] = t1;
+    aes_256_assist2(&t1, &t3);
+    ek[9] = t3;
+
+    t2 = _mm_aeskeygenassist_si128(t3, 0x10);
+    aes_256_assist1(&t1, &t2);
+    ek[10] = t1;
+}
+
+STATIC INLINE void aes_pseudo_round(const uint8_t *in, uint8_t *out,
+                                    const uint8_t *expandedKey, int nblocks)
+{
+    __m128i *k = R128(expandedKey);
+    __m128i d;
+    int i;
+
+    for(i = 0; i < nblocks; i++)
+    {
+        d = _mm_loadu_si128(R128(in + i * AES_BLOCK_SIZE));
+        d = _mm_aesenc_si128(d, *R128(&k[0]));
+        d = _mm_aesenc_si128(d, *R128(&k[1]));
+        d = _mm_aesenc_si128(d, *R128(&k[2]));
+        d = _mm_aesenc_si128(d, *R128(&k[3]));
+        d = _mm_aesenc_si128(d, *R128(&k[4]));
+        d = _mm_aesenc_si128(d, *R128(&k[5]));
+        d = _mm_aesenc_si128(d, *R128(&k[6]));
+        d = _mm_aesenc_si128(d, *R128(&k[7]));
+        d = _mm_aesenc_si128(d, *R128(&k[8]));
+        d = _mm_aesenc_si128(d, *R128(&k[9]));
+        _mm_storeu_si128((R128(out + i * AES_BLOCK_SIZE)), d);
     }
-    memcpy(&long_state[i * INIT_SIZE_BYTE], text, INIT_SIZE_BYTE);
-  }
-
-  for (i = 0; i < 16; i++) {
-    a[i] = state.k[     i] ^ state.k[32 + i];
-    b[i] = state.k[16 + i] ^ state.k[48 + i];
-  }
-
-  for (i = 0; i < ITER / 2; i++) {
-    /* Dependency chain: address -> read value ------+
-     * written value <-+ hard function (AES or MUL) <+
-     * next address  <-+
-     */
-    /* Iteration 1 */
-    j = e2i(a, MEMORY / AES_BLOCK_SIZE);
-    copy_block(c, &long_state[j * AES_BLOCK_SIZE]);
-    oaes_encryption_round(a, c);
-    xor_blocks(b, c);
-    swap_blocks(b, c);
-    copy_block(&long_state[j * AES_BLOCK_SIZE], c);
-    assert(j == e2i(a, MEMORY / AES_BLOCK_SIZE));
-    swap_blocks(a, b);
-    /* Iteration 2 */
-    j = e2i(a, MEMORY / AES_BLOCK_SIZE);
-    copy_block(c, &long_state[j * AES_BLOCK_SIZE]);
-    mul(a, c, d);
-    sum_half_blocks(b, d);
-    swap_blocks(b, c);
-    xor_blocks(b, c);
-    copy_block(&long_state[j * AES_BLOCK_SIZE], c);
-    assert(j == e2i(a, MEMORY / AES_BLOCK_SIZE));
-    swap_blocks(a, b);
-  }
-
-  memcpy(text, state.init, INIT_SIZE_BYTE);
-  for (i = 0; i < MEMORY / INIT_SIZE_BYTE; i++) {
-    for (j = 0; j < INIT_SIZE_BLK; j++) {
-      /*oaes_key_import_data(aes_ctx, &long_state[i * INIT_SIZE_BYTE + j * AES_BLOCK_SIZE], AES_KEY_SIZE);*/
-      oaes_key_import_data(aes_ctx, &state.hs.b[32], AES_KEY_SIZE);
-      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]);
+}
+
+STATIC INLINE void aes_pseudo_round_xor(const uint8_t *in, uint8_t *out,
+                                        const uint8_t *expandedKey, const uint8_t *xor, int nblocks)
+{
+    __m128i *k = R128(expandedKey);
+    __m128i *x = R128(xor);
+    __m128i d;
+    int i;
+
+    for(i = 0; i < nblocks; i++)
+    {
+        d = _mm_loadu_si128(R128(in + i * AES_BLOCK_SIZE));
+        d = _mm_xor_si128(d, *R128(x++));
+        d = _mm_aesenc_si128(d, *R128(&k[0]));
+        d = _mm_aesenc_si128(d, *R128(&k[1]));
+        d = _mm_aesenc_si128(d, *R128(&k[2]));
+        d = _mm_aesenc_si128(d, *R128(&k[3]));
+        d = _mm_aesenc_si128(d, *R128(&k[4]));
+        d = _mm_aesenc_si128(d, *R128(&k[5]));
+        d = _mm_aesenc_si128(d, *R128(&k[6]));
+        d = _mm_aesenc_si128(d, *R128(&k[7]));
+        d = _mm_aesenc_si128(d, *R128(&k[8]));
+        d = _mm_aesenc_si128(d, *R128(&k[9]));
+        _mm_storeu_si128((R128(out + i * AES_BLOCK_SIZE)), d);
     }
-  }
-  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);
+}
+
+#if defined(_MSC_VER)
+BOOL SetLockPagesPrivilege(HANDLE hProcess, BOOL bEnable)
+{
+    struct
+    {
+        DWORD count;
+        LUID_AND_ATTRIBUTES privilege[1];
+    } info;
+
+    HANDLE token;
+    if(!OpenProcessToken(hProcess, TOKEN_ADJUST_PRIVILEGES, &token))
+        return FALSE;
+
+    info.count = 1;
+    info.privilege[0].Attributes = bEnable ? SE_PRIVILEGE_ENABLED : 0;
+
+    if(!LookupPrivilegeValue(NULL, SE_LOCK_MEMORY_NAME, &(info.privilege[0].Luid)))
+        return FALSE;
+
+    if(!AdjustTokenPrivileges(token, FALSE, (PTOKEN_PRIVILEGES) &info, 0, NULL, NULL))
+        return FALSE;
+
+    if (GetLastError() != ERROR_SUCCESS)
+        return FALSE;
+
+    CloseHandle(token);
+
+    return TRUE;
+
+}
+#endif
+
+void slow_hash_allocate_state(void)
+{
+    int state = 0;
+    if(hp_state != NULL)
+        return;
+
+#if defined(_MSC_VER)
+    SetLockPagesPrivilege(GetCurrentProcess(), TRUE);
+    hp_state = (uint8_t *) VirtualAlloc(hp_state, MEMORY, MEM_LARGE_PAGES |
+                                        MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
+#else
+    hp_state = mmap(0, MEMORY, PROT_READ | PROT_WRITE,
+                    MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB, 0, 0);
+    if(hp_state == MAP_FAILED)
+        hp_state = NULL;
+#endif
+    hp_allocated = 1;
+    if(hp_state == NULL)
+    {
+        hp_allocated = 0;
+        hp_state = (uint8_t *) malloc(MEMORY);
+    }
+}
+
+void slow_hash_free_state(void)
+{
+    if(hp_state == NULL)
+        return;
+
+    if(!hp_allocated)
+        free(hp_state);
+    else
+    {
+#if defined(_MSC_VER)
+        VirtualFree(hp_state, MEMORY, MEM_RELEASE);
+#else
+        munmap(hp_state, MEMORY);
+#endif
+    }
+
+    hp_state = NULL;
+    hp_allocated = 0;
+}
+
+void cn_slow_hash(const void *data, size_t length, char *hash)
+{
+    RDATA_ALIGN16 uint8_t expandedKey[240];
+
+    uint8_t text[INIT_SIZE_BYTE];
+    RDATA_ALIGN16 uint64_t a[2];
+    RDATA_ALIGN16 uint64_t b[2];
+    RDATA_ALIGN16 uint64_t c[2];
+    RDATA_ALIGN16 uint8_t aes_key[AES_KEY_SIZE];
+    union cn_slow_hash_state state;
+    __m128i _a, _b, _c;
+    uint64_t hi, lo;
+
+    size_t i, j;
+    uint64_t *p = NULL;
+    oaes_ctx *aes_ctx;
+    int useAes = check_aes_hw();
+
+    static void (*const extra_hashes[4])(const void *, size_t, char *) =
+    {
+        hash_extra_blake, hash_extra_groestl, hash_extra_jh, hash_extra_skein
+    };
+
+    // this isn't supposed to happen, but guard against it for now.
+    if(hp_state == NULL)
+        slow_hash_allocate_state();
+
+    hash_process(&state.hs, data, length);
+    memcpy(text, state.init, INIT_SIZE_BYTE);
+
+    if(useAes)
+    {
+        aes_expand_key(state.hs.b, expandedKey);
+        for(i = 0; i < MEMORY / INIT_SIZE_BYTE; i++)
+        {
+            aes_pseudo_round(text, text, expandedKey, INIT_SIZE_BLK);
+            memcpy(&hp_state[i * INIT_SIZE_BYTE], text, INIT_SIZE_BYTE);
+        }
+    }
+    else
+    {
+        aes_ctx = (oaes_ctx *) oaes_alloc();
+        oaes_key_import_data(aes_ctx, state.hs.b, AES_KEY_SIZE);
+        for(i = 0; i < MEMORY / INIT_SIZE_BYTE; i++)
+        {
+            for(j = 0; j < INIT_SIZE_BLK; j++)
+                aesb_pseudo_round(&text[AES_BLOCK_SIZE * j], &text[AES_BLOCK_SIZE * j], aes_ctx->key->exp_data);
+
+            memcpy(&hp_state[i * INIT_SIZE_BYTE], text, INIT_SIZE_BYTE);
+        }
+    }
+
+    U64(a)[0] = U64(&state.k[0])[0] ^ U64(&state.k[32])[0];
+    U64(a)[1] = U64(&state.k[0])[1] ^ U64(&state.k[32])[1];
+    U64(b)[0] = U64(&state.k[16])[0] ^ U64(&state.k[48])[0];
+    U64(b)[1] = U64(&state.k[16])[1] ^ U64(&state.k[48])[1];
+
+    _b = _mm_load_si128(R128(b));
+    // this is ugly but the branching affects the loop somewhat so put it outside.
+    if(useAes)
+    {
+        for(i = 0; i < ITER / 2; i++)
+        {
+            pre_aes();
+            _c = _mm_aesenc_si128(_c, _a);
+            // post_aes(), optimized scratchpad twiddling (credits to dga)
+            post_aes();
+        }
+    }
+    else
+    {
+        for(i = 0; i < ITER / 2; i++)
+        {
+            pre_aes();
+            aesb_single_round((uint8_t *) &_c, (uint8_t *) &_c, (uint8_t *) &_a);
+            post_aes();
+        }
+    }
+
+    memcpy(text, state.init, INIT_SIZE_BYTE);
+    if(useAes)
+    {
+        aes_expand_key(&state.hs.b[32], expandedKey);
+        for(i = 0; i < MEMORY / INIT_SIZE_BYTE; i++)
+        {
+            // add the xor to the pseudo round
+            aes_pseudo_round_xor(text, text, expandedKey, &hp_state[i * INIT_SIZE_BYTE], INIT_SIZE_BLK);
+        }
+    }
+    else
+    {
+        oaes_key_import_data(aes_ctx, &state.hs.b[32], AES_KEY_SIZE);
+        for(i = 0; i < MEMORY / INIT_SIZE_BYTE; i++)
+        {
+            for(j = 0; j < INIT_SIZE_BLK; j++)
+            {
+                xor_blocks(&text[j * AES_BLOCK_SIZE], &hp_state[i * INIT_SIZE_BYTE + j * AES_BLOCK_SIZE]);
+                aesb_pseudo_round(&text[AES_BLOCK_SIZE * j], &text[AES_BLOCK_SIZE * j], aes_ctx->key->exp_data);
+            }
+        }
+        oaes_free((OAES_CTX **) &aes_ctx);
+    }
+
+    memcpy(state.init, text, INIT_SIZE_BYTE);
+    hash_permutation(&state.hs);
+    extra_hashes[state.hs.b[0] & 3](&state, 200, hash);
 }