I know that block cipher mode such as ecb and cbc requires padding. I also know that openssl command line tool can switch between add padding/no padding. But does openssl's low level API automatically add padding? Specifically DES_ecb3_encrypt() / DES_ecb3_encrypt().
PS: I checked the EVP interface source code, and it seems the padding operation is done at EVP level. When padding is required, after encryping data using DES_ecb3_encrypt(), EVP will also encrypt padding part.
