【发布时间】：2017-02-09 14:48:11
【问题描述】：
我在 Windows 7 系统上使用 Oracle Java 8 (8u112) 和“Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files for JDK/JRE 8”。为了提高我对安全套接字的理解，我正在尝试编写一个简单的程序，它在线程上打开一个服务器套接字，然后连接到这个套接字。
我想使用 TLSv1.2 和使用 Java keytool 生成的证书。我正在使用来自这个问题的代码（SSLSocketFactoryEx）：Which Cipher Suites to enable for SSL Socket?，但我只指定了我想使用的密码（this Oracle support page 也提到了这些密码）：
TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384
TLS_EMPTY_RENEGOTIATION_INFO_SCSV
不幸的是，当我运行我的程序时握手失败（参见下面的 javax.debug.net=ssl 输出）。如果我添加密码
TLS_DHE_DSS_WITH_AES_256_CBC_SHA256
一切正常。似乎只有带有 DHE_DSS（而不是 ECDHE_*）的密码才有效？任何人都知道为什么以及如何解决它？ JCE 已安装！
*** ClientHello, TLSv1.2
RandomCookie: GMT: 1469871576 bytes = { 114, 27, 128, 235, 21, 129, 252, 118, 108, 93, 245, 56, 159, 145, 94, 197, 161, 8, 37, 124, 4, 8, 58, 189, 102, 164, 83, 249 }
Session ID: {}
Cipher Suites: [TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384, TLS_EMPTY_RENEGOTIATION_INFO_SCSV]
Compression Methods: { 0 }
Extension elliptic_curves, curve names: {secp256r1, sect163k1, sect163r2, secp192r1, secp224r1, sect233k1, sect233r1, sect283k1, sect283r1, secp384r1, sect409k1, sect409r1, secp521r1, sect571k1, sect571r1, secp160k1, secp160r1, secp160r2, sect163r1, secp192k1, sect193r1, sect193r2, secp224k1, sect239k1, secp256k1}
Extension ec_point_formats, formats: [uncompressed]
Extension signature_algorithms, signature_algorithms: SHA512withECDSA, SHA512withRSA, SHA384withECDSA, SHA384withRSA, SHA256withECDSA, SHA256withRSA, SHA256withDSA, SHA1withECDSA, SHA1withRSA, SHA1withDSA
***
main, WRITE: TLSv1.2 Handshake, length = 139
server, READ: TLSv1.2 Handshake, length = 139
*** ClientHello, TLSv1.2
RandomCookie: GMT: 1469871576 bytes = { 114, 27, 128, 235, 21, 129, 252, 118, 108, 93, 245, 56, 159, 145, 94, 197, 161, 8, 37, 124, 4, 8, 58, 189, 102, 164, 83, 249 }
Session ID: {}
Cipher Suites: [TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384, TLS_EMPTY_RENEGOTIATION_INFO_SCSV]
Compression Methods: { 0 }
Extension elliptic_curves, curve names: {secp256r1, sect163k1, sect163r2, secp192r1, secp224r1, sect233k1, sect233r1, sect283k1, sect283r1, secp384r1, sect409k1, sect409r1, secp521r1, sect571k1, sect571r1, secp160k1, secp160r1, secp160r2, sect163r1, secp192k1, sect193r1, sect193r2, secp224k1, sect239k1, secp256k1}
Extension ec_point_formats, formats: [uncompressed]
Extension signature_algorithms, signature_algorithms: SHA512withECDSA, SHA512withRSA, SHA384withECDSA, SHA384withRSA, SHA256withECDSA, SHA256withRSA, SHA256withDSA, SHA1withECDSA, SHA1withRSA, SHA1withDSA
***
%% Initialized: [Session-1, SSL_NULL_WITH_NULL_NULL]
%% Invalidated: [Session-1, SSL_NULL_WITH_NULL_NULL]
server, SEND TLSv1.2 ALERT: fatal, description = handshake_failure
...
【问题讨论】：