fixes

build/Makefile

@@ -1,11 +1,18 @@
 NVCC         := nvcc
 NVCC_FLAGS := -rdc=true -O3 -Xptxas -O3 \
-                -gencode arch=compute_75,code=sm_75 \
+-use_fast_math -ftz=true -prec-div=false -prec-sqrt=false \
-                --default-stream per-thread \
+-gencode arch=compute_75,code=sm_75 \
-                -Wno-deprecated-gpu-targets \
+--default-stream per-thread \
-                --expt-relaxed-constexpr \
+-Wno-deprecated-gpu-targets \
-                -I../libs/ \
+--expt-relaxed-constexpr \
-                -std=c++20
+-I../libs/ \
+-std=c++17
+BUILD ?= RELEASE
+ifeq ($(BUILD),DEBUG)
+    BUILD_DEFINES := -DDEBUG
+else
+    BUILD_DEFINES := -DRELEASE
+endif
 MAIN_SOURCE  := ../sources/main.cu
 LIBS_DIR     := ../libs/
 BUILD_DIR    := ../build

libs/ed25519.cu

@@ -34,7 +34,7 @@ __device__ void ed25519_unproject(unsigned char* x, unsigned char* y, const stru
     f25519_normalize(x);
     f25519_normalize(y);
 }
-__device__ void ed25519_pack(unsigned char* c, const unsigned char* x, const unsigned char* y) {
+__device__ void ed25519_pack(unsigned char* __restrict__ c, const unsigned char* x, const unsigned char* y) {
     unsigned char tmp[F25519_SIZE];
     unsigned char parity;
     f25519_copy(tmp, x);

libs/edsign.cu

@@ -23,10 +23,17 @@ __device__ void edsign_sec_to_pub(unsigned char* pub, const unsigned char* secre
     expand_key(expanded, secret);
     sm_pack(pub, expanded);
 }
-__device__ void compact_wipe(void* data, unsigned long length) {
+__device__ void compact_wipe(void* __restrict__ data, unsigned long length) {
     volatile unsigned char* p = (volatile unsigned char*)data;
-    while (length--) {
+    unsigned long i = 0;
-        *p++ = 0;
+    for (; i + 3 < length; i += 4) {
+        p[i] = 0;
+        p[i + 1] = 0;
+        p[i + 2] = 0;
+        p[i + 3] = 0;
+    }
+    for (; i < length; i++) {
+        p[i] = 0;
     }
 }
 __device__ void ed25519_keygen(unsigned char private_key[64], unsigned char public_key[32], unsigned char random_seed[32]) {

libs/edsign.cuh

@@ -1,10 +1,9 @@
 #ifndef __EDSIGN_CUH
 #define __EDSIGN_CUH
-#define F25519_SIZE 32
 __device__ void expand_key(unsigned char* expanded, const unsigned char* secret);
 __device__ void pp(unsigned char* packed, const struct ed25519_pt* p);
 __device__ void sm_pack(unsigned char* r, const unsigned char* k);
 __device__ void edsign_sec_to_pub(unsigned char* pub, const unsigned char* secret);
-__device__ void compact_wipe(void* data, unsigned long length);
+__device__ void compact_wipe(void* __restrict__ data, unsigned long length);
 __device__ void ed25519_keygen(unsigned char private_key[64], unsigned char public_key[32], unsigned char random_seed[32]);
 #endif

sources/main.cu

@@ -69,29 +69,18 @@ __global__ void initRand(curandState* rs) {
         curand(&rs[id]);
     }
 }
-__device__ __forceinline__ unsigned long long xorshift128plus(unsigned long long* state) noexcept {
+__device__ __forceinline__ void rmbytes(unsigned char* buf, curandState* state) {
-    unsigned long long x = state[0];
-    const unsigned long long y = state[1];
-    state[0] = y;
-    x ^= x << 23;
-    x ^= x >> 17;
-    x ^= y ^ (y >> 26);
-    state[1] = x;
-    return x + y;
-}
-__device__ __forceinline__ void rmbytes(unsigned char* buf, unsigned long long* state) noexcept {
 #pragma unroll 32
-    for (unsigned long i = 0; i < 32; i++) buf[i] = static_cast<unsigned char>(xorshift128plus(state) & 0xFF);
+    for (unsigned long i = 0; i < 32; i++) {
+        buf[i] = curand(state) & 0xFF;
+    }
 }
 __global__ void KeyGen(curandState* randStates) {
     curandState localState = randStates[blockIdx.x * blockDim.x + threadIdx.x];
-    unsigned long long xorshiftState[2];
-    xorshiftState[0] = curand(&localState);
-    xorshiftState[1] = curand(&localState);
-    Key32 seed;
-    KeysBox32 keys;
     while (true) {
-        rmbytes(seed, xorshiftState);
+        KeysBox32 keys;
+        Key32 seed;
+        rmbytes(seed, &localState);
         ed25519_keygen(keys.PrivateKey, keys.PublicKey, seed);
         if (unsigned zeros = getZeros(keys.PublicKey); zeros > atomicMax((unsigned*)&d_high, zeros)) {
             Address raw;