Use const for _nettle_write_* source argument.

ChangeLog

+2016-10-10  Niels Möller  <nisse@lysator.liu.se>
+
+	* write-be32.c (_nettle_write_be32): Use const for source argument.
+	* write-le32.c (_nettle_write_le32): Likewise.
+	* write-le64.c (_nettle_write_le64): Likewise.
+	* nettle-write.h: Update prototypes.
+
 2016-10-01  Niels Möller  <nisse@lysator.liu.se>
 
 	* Released nettle-3.3.

nettle-write.h

@@ -46,13 +46,13 @@
 /* FIXME: Use a macro shortcut to memcpy for native endianness. */
 void
 _nettle_write_be32(size_t length, uint8_t *dst,
-		   uint32_t *src);
+		   const uint32_t *src);
 void
 _nettle_write_le32(size_t length, uint8_t *dst,
-		   uint32_t *src);
+		   const uint32_t *src);
 
 void
 _nettle_write_le64(size_t length, uint8_t *dst,
-		   uint64_t *src);
+		   const uint64_t *src);
 
 #endif /* NETTLE_WRITE_H_INCLUDED */

write-be32.c

@@ -41,7 +41,7 @@
 
 void
 _nettle_write_be32(size_t length, uint8_t *dst,
-		   uint32_t *src)
+		   const uint32_t *src)
 {
   size_t i;
   size_t words;

write-le32.c

@@ -41,7 +41,7 @@
 
 void
 _nettle_write_le32(size_t length, uint8_t *dst,
-		   uint32_t *src)
+		   const uint32_t *src)
 {
   size_t i;
   size_t words;

write-le64.c

@@ -39,7 +39,7 @@
 
 void
 _nettle_write_le64(size_t length, uint8_t *dst,
-		   uint64_t *src)
+		   const uint64_t *src)
 {
   size_t i;
   size_t words;