-void CAST_cbc_encrypt(unsigned char *in, unsigned char *out, long length,
- CAST_KEY *ks, unsigned char *iv, int enc);
-void CAST_cfb64_encrypt(unsigned char *in, unsigned char *out, long length,
- CAST_KEY *schedule, unsigned char *ivec, int *num, int enc);
-void CAST_ofb64_encrypt(unsigned char *in, unsigned char *out, long length,
- CAST_KEY *schedule, unsigned char *ivec, int *num);
+void CAST_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,
+ CAST_KEY *ks, unsigned char *iv, int enc);
+void CAST_cfb64_encrypt(const unsigned char *in, unsigned char *out,
+ long length, CAST_KEY *schedule, unsigned char *ivec,
+ int *num, int enc);
+void CAST_ofb64_encrypt(const unsigned char *in, unsigned char *out,
+ long length, CAST_KEY *schedule, unsigned char *ivec,
+ int *num);