PKCS12_decrypt_skey
if ((p8 = PKCS12_decrypt_skey(bag, pass, passlen)) == NULL)
PKCS8_PRIV_KEY_INFO *PKCS12_decrypt_skey(const PKCS12_SAFEBAG *bag,
p8 = PKCS12_decrypt_skey(bag, enc->pass, strlen(enc->pass));