Cryptographic primitives ................................................................................................................... 226 Entropy and random number generation ..................................................................................... 227 Symmetric key operations ................................................................................................................ 227 Asymmetric key operations ................................................................................................................................................................................................................................................................................................................. 227钥匙存储................................................................................................................................................................................................................................................................................... ................................................................................................. 228 Key export ............................................................................................................................................ 228 Derived Unique Key Per Transaction (DUKPT) protocol ............................................................. 229 Key hierarchy ....................................................................................................................................... 229 Internal operations .................................................................................................................................. 232