Import of code from heimdal

This commit updates the code imported from the external
heimdal git repository to their revision
bf1f62b0a8cf72d32875656a7365f1e14d535dc5
which is described as switch-from-svn-to-git-1605-gbf1f62b

This is locally modified to include the earlier local fix
to sha512.c

Change-Id: I757e636654b713625f7d468da6aa37f1006aaa2a
Reviewed-on: http://gerrit.openafs.org/2954
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Jeffrey Altman <jaltman@openafs.org>

src/external/heimdal/hcrypto/rand-w32.c

@@ -0,0 +1,129 @@
+/*
+ * Copyright (c) 2006 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <config.h>
+#include <roken.h>
+
+#include <wincrypt.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <rand.h>
+#include <heim_threads.h>
+
+#include "randi.h"
+
+volatile static HCRYPTPROV g_cryptprovider = 0;
+
+static HCRYPTPROV
+_hc_CryptProvider(void)
+{
+    BOOL rv;
+    HCRYPTPROV cryptprovider = 0;
+
+    if (g_cryptprovider != 0)
+	return g_cryptprovider;
+
+    rv = CryptAcquireContext(&cryptprovider, NULL,
+			      MS_ENHANCED_PROV, PROV_RSA_FULL,
+			      0);
+
+    if (GetLastError() == NTE_BAD_KEYSET) {
+        if(!rv)
+            rv = CryptAcquireContext(&cryptprovider, NULL,
+                                      MS_ENHANCED_PROV, PROV_RSA_FULL,
+                                      CRYPT_NEWKEYSET);
+    }
+
+    if (rv &&
+        InterlockedCompareExchangePointer((PVOID *) &g_cryptprovider,
+					  (PVOID) cryptprovider, 0) != 0) {
+
+        CryptReleaseContext(cryptprovider, 0);
+        cryptprovider = g_cryptprovider;
+    }
+
+    return cryptprovider;
+}
+
+/*
+ *
+ */
+
+
+static void
+w32crypto_seed(const void *indata, int size)
+{
+}
+
+
+static int
+w32crypto_bytes(unsigned char *outdata, int size)
+{
+    if (CryptGenRandom(_hc_CryptProvider(), size, outdata))
+	return 1;
+    return 0;
+}
+
+static void
+w32crypto_cleanup(void)
+{
+}
+
+static void
+w32crypto_add(const void *indata, int size, double entropi)
+{
+}
+
+static int
+w32crypto_status(void)
+{
+    if (_hc_CryptProvider() == 0)
+	return 0;
+    return 1;
+}
+
+const RAND_METHOD hc_rand_w32crypto_method = {
+    w32crypto_seed,
+    w32crypto_bytes,
+    w32crypto_cleanup,
+    w32crypto_add,
+    w32crypto_bytes,
+    w32crypto_status
+};
+
+const RAND_METHOD *
+RAND_w32crypto_method(void)
+{
+    return &hc_rand_w32crypto_method;
+}