Move CI to github actions and fix DWORD for CryptGenRandom

.github/workflows/test.yml

@@ -0,0 +1,45 @@
+---
+name: Tests
+on: [push, pull_request]
+
+jobs:
+  Test-Randombytes:
+    runs-on: "${{ matrix.os }}"
+    strategy:
+      matrix:
+        cc:
+          - gcc
+          - clang
+        os:
+          - ubuntu-latest
+          - macos-latest
+    env:
+      CC: "${{ matrix.cc }}"
+    steps:
+      - uses: actions/checkout@v3
+      - run: |
+          make check
+
+  Test-Randombytes-Musl:
+    runs-on: ubuntu-latest
+    env:
+      CC: musl-gcc
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install musl-tools
+        run: sudo apt-get install -y musl-tools
+      - run: make check
+
+  Test-Randombytes-Windows:
+    runs-on: windows-latest
+    strategy:
+      matrix:
+        arch:
+          - x64
+          - x86
+    steps:
+      - uses: actions/checkout@v3
+      - uses: ilammy/msvc-dev-cmd@v1
+        with:
+          arch: ${{ matrix.arch }}
+      - run: cl /c /nologo /W3 /WX randombytes.c

randombytes.c

@@ -76,17 +76,24 @@
 
 
 #if defined(_WIN32)
-static int randombytes_win32_randombytes(void* buf, const size_t n)
+static int randombytes_win32_randombytes(void* buf, size_t n)
 {
 	HCRYPTPROV ctx;
 	BOOL tmp;
+	DWORD to_read = 0;
+	const size_t MAX_DWORD = 0xFFFFFFFF;
 
 	tmp = CryptAcquireContext(&ctx, NULL, NULL, PROV_RSA_FULL,
 	                          CRYPT_VERIFYCONTEXT);
 	if (tmp == FALSE) return -1;
 
-	tmp = CryptGenRandom(ctx, n, (BYTE*) buf);
-	if (tmp == FALSE) return -1;
+	while (n > 0) {
+		to_read = (DWORD)(n < MAX_DWORD ? n : MAX_DWORD);
+		tmp = CryptGenRandom(ctx, to_read, (BYTE*) buf);
+		if (tmp == FALSE) return -1;
+		buf = ((char*)buf) + to_read;
+		n -= to_read;
+	}
 
 	tmp = CryptReleaseContext(ctx, 0);
 	if (tmp == FALSE) return -1;