由于JDK版本不同，在Java 8 update 161版本以后就会出现此问题，根本原因还是DH密钥长度至少为512位，而DES算法密钥没有这么长，密钥长度不一致引起的。

解决方法：

配置JVM的系统变量：-Djdk.crypto.KeyAgreement.legacyKDF=true

我的也是，怎么解决的 啊！

java.security.NoSuchAlgorithmException: Unsupported secret key algorithm: DES

at com.sun.crypto.provider.DHKeyAgreement.engineGenerateSecret(DHKeyAgreement.java:387)

at javax.crypto.KeyAgreement.generateSecret(KeyAgreement.java:648)

at com.wbs.security.dh.ImoocDH.jdkDH(ImoocDH.java:50)

at com.wbs.security.dh.ImoocDH.main(ImoocDH.java:24)

47        KeyAgreement receiverKeyAgreement = KeyAgreement.getInstance("DH");

48        receiverKeyAgreement.init(receiverPrivateKey);

49        receiverKeyAgreement.doPhase(receiverPublicKey, true);

50        SecretKey receiverDesKey = receiverKeyAgreement.generateSecret("DES");

jdk版本问题

这里的 DES。

//3.密钥构建

KeyAgreement receiveKeyAgreement = KeyAgreement.getInstance("DH");

receiveKeyAgreement.init(receivePrivateKey);

receiveKeyAgreement.doPhase(receivePublicKey, true);

SecretKey receiveDesKey = receiveKeyAgreement.generateSecret("DES");