bcrypt: Add basic support for pseudo-handles.

dlls/bcrypt/bcrypt_main.c

@@ -190,6 +190,17 @@ NTSTATUS WINAPI BCryptGenRandom(BCRYPT_ALG_HANDLE handle, UCHAR *buffer, ULONG c
         if (!(flags & BCRYPT_USE_SYSTEM_PREFERRED_RNG))
             return STATUS_INVALID_HANDLE;
     }
+    else if (((ULONG_PTR)algorithm & 1) == 1)
+    {
+        /* Pseudo algorithm handles are denoted by having the lowest bit set.
+         * An aligned algorithm pointer will never have this bit set.
+         */
+        if (algorithm != BCRYPT_RNG_ALG_HANDLE)
+        {
+            FIXME("pseudo-handle algorithm %p not supported\n", algorithm);
+            return STATUS_NOT_IMPLEMENTED;
+        }
+    }
     else if (algorithm->hdr.magic != MAGIC_ALG || algorithm->id != ALG_ID_RNG)
         return STATUS_INVALID_HANDLE;
 

dlls/bcrypt/tests/bcrypt.c

@@ -57,6 +57,14 @@ static void test_BCryptGenRandom(void)
     ret = BCryptGenRandom(NULL, buffer, 8, BCRYPT_USE_SYSTEM_PREFERRED_RNG);
     ok(ret == STATUS_SUCCESS, "Expected success, got %#lx\n", ret);
     ok(memcmp(buffer, buffer + 8, 8), "Expected a random number, got 0\n");
+
+    /* Test pseudo handle, which was introduced at the same time as BCryptHash */
+    if (pBCryptHash)
+    {
+        ret = BCryptGenRandom(BCRYPT_RNG_ALG_HANDLE, buffer, sizeof(buffer), 0);
+        ok(ret == STATUS_SUCCESS, "Expected success, got %#lx\n", ret);
+    }
+    else win_skip("BCryptGenRandom pseudo handles are not available\n");
 }
 
 static void test_BCryptGetFipsAlgorithmMode(void)

include/bcrypt.h

@@ -401,6 +401,9 @@ typedef PVOID BCRYPT_HANDLE;
 typedef PVOID BCRYPT_HASH_HANDLE;
 typedef PVOID BCRYPT_SECRET_HANDLE;
 
+/* Pseudo handles for BCryptGenRandom */
+#define BCRYPT_RNG_ALG_HANDLE       ((BCRYPT_ALG_HANDLE)0x00000081)
+
 /* Flags for BCryptGenRandom */
 #define BCRYPT_RNG_USE_ENTROPY_IN_BUFFER 0x00000001
 #define BCRYPT_USE_SYSTEM_PREFERRED_RNG  0x00000002