-void RC2_ofb64_encrypt(in, out, length, schedule, ivec, num)
-unsigned char *in;
-unsigned char *out;
-long length;
-RC2_KEY *schedule;
-unsigned char *ivec;
-int *num;
+void RC2_ofb64_encrypt(const unsigned char *in, unsigned char *out,
+ long length, RC2_KEY *schedule, unsigned char *ivec,
+ int *num)