2 files changed, 3 insertions, 3 deletions

diff --git a/src/lib/libcrypto/buffer/buffer.c b/src/lib/libcrypto/buffer/buffer.c
index d7aa79ad7f..d4a4ce43b3 100644
--- a/src/lib/libcrypto/buffer/buffer.c
+++ b/src/lib/libcrypto/buffer/buffer.c
@@ -179,14 +179,14 @@ int BUF_MEM_grow_clean(BUF_MEM *str, size_t len)
         return(len);
         }
 
-void BUF_reverse(unsigned char *out, unsigned char *in, size_t size)
+void BUF_reverse(unsigned char *out, const unsigned char *in, size_t size)
         {
         size_t i;
         if (in)
                 {
                 out += size - 1;
                 for (i = 0; i < size; i++)
-                        *in++ = *out--;
+                        *out-- = *in++;
                 }
         else
                 {
diff --git a/src/lib/libcrypto/buffer/buffer.h b/src/lib/libcrypto/buffer/buffer.h
index 178e418282..f8da32b485 100644
--- a/src/lib/libcrypto/buffer/buffer.h
+++ b/src/lib/libcrypto/buffer/buffer.h
@@ -88,7 +88,7 @@ int	BUF_MEM_grow_clean(BUF_MEM *str, size_t len);
 char *  BUF_strdup(const char *str);
 char *  BUF_strndup(const char *str, size_t siz);
 void *  BUF_memdup(const void *data, size_t siz);
-void    BUF_reverse(unsigned char *out, unsigned char *in, size_t siz);
+void    BUF_reverse(unsigned char *out, const unsigned char *in, size_t siz);
 
 /* safe string functions */
 size_t BUF_strlcpy(char *dst,const char *src,size_t siz);