DES_cfb_encrypt
DES_cfb_encrypt(c, d, 1, 1, ctx->cipher_data,
DES_cfb_encrypt(in, out, 8, (long)chunk,
DES_cfb_encrypt(in, out, 8, (long)inl, ctx->cipher_data,
void DES_cfb_encrypt(const unsigned char *in,unsigned char *out,int numbits,