2 files changed, 2 insertions, 2 deletions

diff --git a/src/lib/libcrypto/cast/c_skey.c b/src/lib/libcrypto/cast/c_skey.c
index acf2c3eeb5..76e40005c9 100644
--- a/src/lib/libcrypto/cast/c_skey.c
+++ b/src/lib/libcrypto/cast/c_skey.c
@@ -72,7 +72,7 @@
 #define S6 CAST_S_table6
 #define S7 CAST_S_table7
 
-void CAST_set_key(CAST_KEY *key, int len, unsigned char *data)
+void CAST_set_key(CAST_KEY *key, int len, const unsigned char *data)
         {
         CAST_LONG x[16];
         CAST_LONG z[16];
diff --git a/src/lib/libcrypto/cast/cast.h b/src/lib/libcrypto/cast/cast.h
index 6cc5e8aa8c..e24e133099 100644
--- a/src/lib/libcrypto/cast/cast.h
+++ b/src/lib/libcrypto/cast/cast.h
@@ -82,7 +82,7 @@ typedef struct cast_key_st
         } CAST_KEY;
 
  
-void CAST_set_key(CAST_KEY *key, int len, unsigned char *data);
+void CAST_set_key(CAST_KEY *key, int len, const unsigned char *data);
 void CAST_ecb_encrypt(const unsigned char *in,unsigned char *out,CAST_KEY *key,
                       int enc);
 void CAST_encrypt(CAST_LONG *data,CAST_KEY *key);