move isaac RNG utility functions to new rust_rng.cpp file

src/rt/rust_util.h

@@ -136,65 +136,6 @@ inline size_t get_box_size(size_t body_size, size_t body_align) {
     return total_size;
 }
 
-// Initialization helpers for ISAAC RNG
-
-inline void isaac_seed(rust_kernel* kernel, uint8_t* dest, size_t size)
-{
-#ifdef __WIN32__
-    HCRYPTPROV hProv;
-    kernel->win32_require
-        (_T("CryptAcquireContext"),
-         CryptAcquireContext(&hProv, NULL, NULL, PROV_RSA_FULL,
-                             CRYPT_VERIFYCONTEXT|CRYPT_SILENT));
-    kernel->win32_require
-        (_T("CryptGenRandom"), CryptGenRandom(hProv, size, (BYTE*) dest));
-    kernel->win32_require
-        (_T("CryptReleaseContext"), CryptReleaseContext(hProv, 0));
-#else
-    int fd = open("/dev/urandom", O_RDONLY);
-    if (fd == -1)
-        kernel->fatal("error opening /dev/urandom: %s", strerror(errno));
-    size_t amount = 0;
-    do {
-        ssize_t ret = read(fd, dest+amount, size-amount);
-        if (ret < 0)
-            kernel->fatal("error reading /dev/urandom: %s", strerror(errno));
-        else if (ret == 0)
-            kernel->fatal("somehow hit eof reading from /dev/urandom");
-        amount += (size_t)ret;
-    } while (amount < size);
-    int ret = close(fd);
-    // FIXME #3697: Why does this fail sometimes?
-    if (ret != 0)
-        kernel->log(log_warn, "error closing /dev/urandom: %s",
-            strerror(errno));
-#endif
-}
-
-inline void
-isaac_init(rust_kernel *kernel, randctx *rctx, rust_vec_box* user_seed)
-{
-    memset(rctx, 0, sizeof(randctx));
-
-    char *env_seed = kernel->env->rust_seed;
-    if (user_seed != NULL) {
-        // ignore bytes after the required length
-        size_t seed_len = user_seed->body.fill < sizeof(rctx->randrsl)
-            ? user_seed->body.fill : sizeof(rctx->randrsl);
-        memcpy(&rctx->randrsl, user_seed->body.data, seed_len);
-    } else if (env_seed != NULL) {
-        ub4 seed = (ub4) atoi(env_seed);
-        for (size_t i = 0; i < RANDSIZ; i ++) {
-            memcpy(&rctx->randrsl[i], &seed, sizeof(ub4));
-            seed = (seed + 0x7ed55d16) + (seed << 12);
-        }
-    } else {
-        isaac_seed(kernel, (uint8_t*) &rctx->randrsl, sizeof(rctx->randrsl));
-    }
-
-    randinit(rctx, 1);
-}
-
 //
 // Local Variables:
 // mode: C++