6.1对称算法以及base64编码编程
.............................\evp_enc_dec
.............................\...........\evp_enc_dec.cpp
.............................\...........\evp_enc_dec.dsp
.............................\...........\evp_enc_dec.dsw
.............................\...........\evp_enc_dec.ncb
.............................\...........\evp_enc_dec.opt
.............................\...........\evp_enc_dec.plg