-void BF_cfb64_encrypt(in, out, length, schedule, ivec, num, encrypt)
-unsigned char *in;
-unsigned char *out;
-long length;
-BF_KEY *schedule;
-unsigned char *ivec;
-int *num;
-int encrypt;
+void BF_cfb64_encrypt(const unsigned char *in, unsigned char *out, long length,
+ const BF_KEY *schedule, unsigned char *ivec, int *num, int encrypt)