DES_pcbc_encrypt
DES_pcbc_encrypt(data, data, len, s, &ivec, encryptp);
void DES_pcbc_encrypt(const unsigned char *input, unsigned char *output,
DES_pcbc_encrypt(cbc_data, cbc_out, n, &ks,
DES_pcbc_encrypt(cbc_out, cbc_in, n, &ks,