基于JCE的密钥分配------------------------（三）利用公钥密码技术实现对称密码技术密钥的分配

假定作为通讯的双方A和B已经拥有对方的公钥===================Provider.java，加密解密算法工具类======================package third_hard; import javax.crypto.Cipher;import javax.crypto.KeyGenerator;import javax.crypto.SecretKey;import javax.crypto.SecretKeyFactory;import javax.crypto.spec.DESKeySpec;import java.security.*;import java.security.spec.RSAPublicKeySpec;import java.security.spec.RSAPrivateKeySpec;import java.security.spec.InvalidKeySpecException;