ECPrivateKey
privateKey()
SM2KeyAgreementParamSpec(byte[] id, ECPrivateKey privateKey, ECPublicKey publicKey, byte[] peerId, ECPublicKey peerPublicKey, boolean isInitiator, int sharedKeyLength)
SM2KeyAgreementParamSpec
SM2KeyAgreementParamSpec(ECPrivateKey privateKey, ECPublicKey publicKey, ECPublicKey peerPublicKey, boolean isInitiator, int sharedKeyLength)