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From:   Sandy Harris <sandyinchina@gmail.com>
Date:   Thu, 10 Feb 2022 22:32:58 +0800
Message-ID: <CACXcFmk-aYykec-paGy9S-kRy4ipZkhX009qdtJo+fPjopPCiQ@mail.gmail.com>
Subject: Subject: [PATCH 1/4] random: Simple utility functions
To:     Linux Crypto Mailing List <linux-crypto@vger.kernel.org>,
        "Ted Ts'o" <tytso@mit.edu>, "Jason A. Donenfeld" <Jason@zx2c4.com>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Simple utilty functions used by patches later in the series

Signed-off-by: Sandy Harris <sandyinchina@gmail.com>

---
 drivers/char/random.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/char/random.c b/drivers/char/random.c
index 3404a91edf29..c8618020b49f 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -356,6 +356,27 @@
 #define CREATE_TRACE_POINTS
 #include <trace/events/random.h>

+static void xor128(u32 *target, u32 *source)
+{
+    int i ;
+    for (i = 0 ; i < 4 ; i++)
+        *target++ ^= *source++ ;
+}
+
+static void add128(u32 *target, u32 *source)
+{
+    int i ;
+    for (i = 0 ; i < 4 ; i++)
+        *target++ += *source++ ;
+}
+
+static int get_hw_long(unsigned long *x)
+{
+    int ret ;
+    ret = get_random_bytes_arch((u8 *) x, 8) ;
+    return (ret == 8) ? 1 : 0 ;
+}
+
 /* #define ADD_INTERRUPT_BENCH */

 /*
-- 
2.25.1