void BF_cbc_encrypt(unsigned char *in, unsigned char *out, long length,
BF_KEY *ks, unsigned char *iv, int enc);
void BF_cfb64_encrypt(unsigned char *in, unsigned char *out, long length,
void BF_cbc_encrypt(unsigned char *in, unsigned char *out, long length,
BF_KEY *ks, unsigned char *iv, int enc);
void BF_cfb64_encrypt(unsigned char *in, unsigned char *out, long length,