Convert the sigma and tau initialisers to byte arrays, rather than using

strings. The original code is perfectly valid C, however it causes some
compilers to complain since it lacks room for a string NUL terminator and
the compiler is not smart enough to realise that these are only used as
byte arrays and never treated as strings.

ok bcook@ beck@ inoguchi@

1 files changed, 12 insertions, 3 deletions

diff --git a/lib/libcrypto/chacha/chacha-merged.c b/lib/libcrypto/chacha/chacha-merged.c
index 557dfd5b568..08511ed2736 100644
--- a/lib/libcrypto/chacha/chacha-merged.c
+++ b/lib/libcrypto/chacha/chacha-merged.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: chacha-merged.c,v 1.7 2014/07/11 08:47:47 bcook Exp $ */
+/* $OpenBSD: chacha-merged.c,v 1.8 2017/08/13 16:55:31 jsing Exp $ */
 /*
 chacha-merged.c version 20080118
 D. J. Bernstein
@@ -72,8 +72,17 @@ typedef struct chacha_ctx chacha_ctx;
   a = PLUS(a,b); d = ROTATE(XOR(d,a), 8); \
   c = PLUS(c,d); b = ROTATE(XOR(b,c), 7);
 
-static const char sigma[16] = "expand 32-byte k";
-static const char tau[16] = "expand 16-byte k";
+/* Initialise with "expand 32-byte k". */
+static const char sigma[16] = {
+	0x65, 0x78, 0x70, 0x61, 0x6e, 0x64, 0x20, 0x33,
+	0x32, 0x2d, 0x62, 0x79, 0x74, 0x65, 0x20, 0x6b,
+};
+
+/* Initialise with "expand 16-byte k". */
+static const char tau[16] = {
+	0x65, 0x78, 0x70, 0x61, 0x6e, 0x64, 0x20, 0x31,
+	0x36, 0x2d, 0x62, 0x79, 0x74, 0x65, 0x20, 0x6b,
+};
 
 static inline void
 chacha_keysetup(chacha_ctx *x, const u8 *k, u32 kbits)