DES_cfb64_encrypt
DES_cfb64_encrypt(data, data, len, s, &ivec, &num, encryptp);
DES_cfb64_encrypt(in, out, (long)EVP_MAXCHUNK,
DES_cfb64_encrypt(in, out, (long)inl,
void DES_cfb64_encrypt(const unsigned char *in, unsigned char *out,
DES_cfb64_encrypt(in, out, (long)chunk, key, (DES_cblock *)ctx->iv,
DES_cfb64_encrypt(plain, cfb_buf1, 12, &ks, &cfb_tmp, &n, DES_ENCRYPT);
DES_cfb64_encrypt(&plain[12], &cfb_buf1[12], sizeof(plain) - 12, &ks,
DES_cfb64_encrypt(cfb_buf1, cfb_buf2, 17, &ks, &cfb_tmp, &n, DES_DECRYPT);
DES_cfb64_encrypt(&cfb_buf1[17], &cfb_buf2[17],