Import QEMU upstream snapshot d2e570c

Upstream: https://gitlab.com/qemu-project/qemu.git

Upstream-Commit: d2e570cc0f97b936902a5b1b86b73c0f5998b475

crypto/ivgen-plain.c

@@ -0,0 +1,60 @@
+/*
+ * QEMU Crypto block IV generator - plain
+ *
+ * Copyright (c) 2015-2016 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/bswap.h"
+#include "ivgen-plain.h"
+
+static int qcrypto_ivgen_plain_init(QCryptoIVGen *ivgen,
+                                    const uint8_t *key, size_t nkey,
+                                    Error **errp)
+{
+    return 0;
+}
+
+static int qcrypto_ivgen_plain_calculate(QCryptoIVGen *ivgen,
+                                         uint64_t sector,
+                                         uint8_t *iv, size_t niv,
+                                         Error **errp)
+{
+    size_t ivprefix;
+    uint32_t shortsector = cpu_to_le32((sector & 0xffffffff));
+    ivprefix = sizeof(shortsector);
+    if (ivprefix > niv) {
+        ivprefix = niv;
+    }
+    memcpy(iv, &shortsector, ivprefix);
+    if (ivprefix < niv) {
+        memset(iv + ivprefix, 0, niv - ivprefix);
+    }
+    return 0;
+}
+
+static void qcrypto_ivgen_plain_cleanup(QCryptoIVGen *ivgen)
+{
+}
+
+
+struct QCryptoIVGenDriver qcrypto_ivgen_plain = {
+    .init = qcrypto_ivgen_plain_init,
+    .calculate = qcrypto_ivgen_plain_calculate,
+    .cleanup = qcrypto_ivgen_plain_cleanup,
+};
+