[Minios-devel] [UNIKRAFT PATCH v2 1/4] lib/ukswrand: Adapt the library to work with multiple algorithms

[Vlad-Andrei BĂDOIU (78692) <vlad_andrei.badoiu@xxxxxxxxxxxxxxx>]

We move the common function, uk_swrand_fill_buffer, to swrand.c and move
the common definitions to include/uk/swrand.h.

Signed-off-by: Vlad-Andrei Badoiu <vlad_andrei.badoiu@xxxxxxxxxxxxxxx>
---
 lib/ukswrand/Makefile.uk         |  1 +
 lib/ukswrand/include/uk/swrand.h | 10 ++----
 lib/ukswrand/mwc.c               | 27 ++++------------
 lib/ukswrand/swrand.c            | 53 ++++++++++++++++++++++++++++++++
 4 files changed, 63 insertions(+), 28 deletions(-)
 create mode 100644 lib/ukswrand/swrand.c

diff --git a/lib/ukswrand/Makefile.uk b/lib/ukswrand/Makefile.uk
index 6cf1223e..da85d381 100644
--- a/lib/ukswrand/Makefile.uk
+++ b/lib/ukswrand/Makefile.uk
@@ -5,4 +5,5 @@ CXXINCLUDES-$(CONFIG_LIBUKSWRAND) += 
-I$(LIBUKSWRAND_BASE)/include
 
 LIBUKSWRAND_SRCS-$(CONFIG_LIBUKSWRAND_MWC) += $(LIBUKSWRAND_BASE)/mwc.c
 LIBUKSWRAND_SRCS-$(CONFIG_LIBUKSWRAND_DEVFS) += $(LIBUKSWRAND_BASE)/dev.c
+LIBUKSWRAND_SRCS-y += $(LIBUKSWRAND_BASE)/swrand.c
 LIBUKSWRAND_SRCS-y += $(LIBUKSWRAND_BASE)/getrandom.c
diff --git a/lib/ukswrand/include/uk/swrand.h b/lib/ukswrand/include/uk/swrand.h
index 8523e207..77912182 100644
--- a/lib/ukswrand/include/uk/swrand.h
+++ b/lib/ukswrand/include/uk/swrand.h
@@ -44,13 +44,9 @@
 extern "C" {
 #endif
 
-struct uk_swrand {
-#ifdef CONFIG_LIBUKSWRAND_MWC
-        __u32 Q[4096];
-        __u32 c;
-        __u32 i;
-#endif
-};
+#define UK_SWRAND_CTOR_PRIO    1
+
+struct uk_swrand;
 
 extern struct uk_swrand uk_swrand_def;
 
diff --git a/lib/ukswrand/mwc.c b/lib/ukswrand/mwc.c
index 85abf0c6..820aa2a2 100644
--- a/lib/ukswrand/mwc.c
+++ b/lib/ukswrand/mwc.c
@@ -41,7 +41,12 @@
 
 /* 
https://stackoverflow.com/questions/9492581/c-random-number-generation-pure-c-code-no-libraries-or-functions
 */
 #define PHI 0x9e3779b9
-#define UK_SWRAND_CTOR_PRIO    1
+
+struct uk_swrand {
+       __u32 Q[4096];
+       __u32 c;
+       __u32 i;
+};
 
 struct uk_swrand uk_swrand_def;
 
@@ -91,26 +96,6 @@ __u32 uk_swrand_randr_r(struct uk_swrand *r)
        return (r->Q[i] = y - x);
 }
 
-ssize_t uk_swrand_fill_buffer(void *buf, size_t buflen)
-{
-       size_t step, chunk_size, i;
-       __u32 rd;
-
-       step = sizeof(__u32);
-       chunk_size = buflen % step;
-
-       for (i = 0; i < buflen - chunk_size; i += step)
-               *((char *) buf + i) = uk_swrand_randr();
-
-       /* fill the remaining bytes of the buffer */
-       if (chunk_size > 0) {
-               rd = uk_swrand_randr();
-               memcpy(buf + i, &rd, chunk_size);
-       }
-
-       return buflen;
-}
-
 static void _uk_swrand_ctor(void)
 {
        uk_pr_info("Initialize random number generator...\n");
diff --git a/lib/ukswrand/swrand.c b/lib/ukswrand/swrand.c
new file mode 100644
index 00000000..d98bb0df
--- /dev/null
+++ b/lib/ukswrand/swrand.c
@@ -0,0 +1,53 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * Copyright (c) 2019, University Politehnica of Bucharest. 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 copyright holder 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.
+ *
+ * THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
+ */
+#include <string.h>
+#include <uk/swrand.h>
+
+ssize_t uk_swrand_fill_buffer(void *buf, size_t buflen)
+{
+       size_t step, chunk_size, i;
+       __u32 rd;
+
+       step = sizeof(__u32);
+       chunk_size = buflen % step;
+
+       for (i = 0; i < buflen - chunk_size; i += step)
+               *((char *) buf + i) = uk_swrand_randr();
+
+       /* fill the remaining bytes of the buffer */
+       if (chunk_size > 0) {
+               rd = uk_swrand_randr();
+               memcpy(buf + i, &rd, chunk_size);
+       }
+
+       return buflen;
+}
-- 
2.20.1


_______________________________________________
Minios-devel mailing list
Minios-devel@xxxxxxxxxxxxxxxxxxxx
https://lists.xenproject.org/mailman/listinfo/minios-devel