SSLSOcket在Android6.0中出错原因

发生情境：
通过sslsocket在Android API23以下正常通讯，但在Android6.0时，报错；错误信息如下：

Android端报错：

core_booster, getBoosterConfig = false javax.net.ssl.SSLHandshakeException: Handshake failed     at com.android.org.conscrypt.OpenSSLSocketImpl.startHandshake(OpenSSLSocketImpl.java:396)     at com.android.org.conscrypt.OpenSSLSocketImpl.waitForHandshake(OpenSSLSocketImpl.java:629)     at com.android.org.conscrypt.OpenSSLSocketImpl.getOutputStream(OpenSSLSocketImpl.java:615) Caused by: javax.net.ssl.SSLProtocolException: SSL handshake terminated: ssl=0x7fa0a92880: Failure in SSL library, usually a protocol error error:100c5410:SSL routines:ssl3_read_bytes:SSLV3_ALERT_HANDSHAKE_FAILURE (external/boringssl/src/ssl/s3_pkt.c:972 0x7f9e04c860:0x00000001) error:100c009f:SSL routines:ssl3_get_server_hello:HANDSHAKE_FAILURE_ON_CLIENT_HELLO (external/boringssl/src/ssl/s3_clnt.c:750 0x7f92721518:0x00000000)     at com.android.org.conscrypt.NativeCrypto.SSL_do_handshake(Native Method)     at com.android.org.conscrypt.OpenSSLSocketImpl.startHandshake(OpenSSLSocketImpl.java:324)

服务端报错：

javax.net.ssl.SSLHandshakeException: no cipher suites in common    at sun.security.ssl.Alerts.getSSLException(Unknown Source)    at sun.security.ssl.SSLSocketImpl.fatal(Unknown Source)    at sun.security.ssl.Handshaker.fatalSE(Unknown Source)    at sun.security.ssl.Handshaker.fatalSE(Unknown Source)    at sun.security.ssl.ServerHandshaker.chooseCipherSuite(Unknown Source)    at sun.security.ssl.ServerHandshaker.clientHello(Unknown Source)    at sun.security.ssl.ServerHandshaker.processMessage(Unknown Source)    at sun.security.ssl.Handshaker.processLoop(Unknown Source)    at sun.security.ssl.Handshaker.process_record(Unknown Source)    at sun.security.ssl.SSLSocketImpl.readRecord(Unknown Source)    at sun.security.ssl.SSLSocketImpl.performInitialHandshake(Unknown Source)    at sun.security.ssl.SSLSocketImpl.readDataRecord(Unknown Source)    at sun.security.ssl.AppInputStream.read(Unknown Source)    at sun.security.ssl.AppInputStream.read(Unknown Source)    at java.io.DataInputStream.readLine(Unknown Source)    at com.bbcvision.ssl.Server$ReceiveSocket.getHttpHeader(Server.java:209)    at com.bbcvision.ssl.Server$ReceiveSocket.run(Server.java:236)

原因：
SSLSocket签名算法默认为DSA，Android6.0（API 23）以后KeyStore发生更改，不再支持DSA，但仍支持ECDSA。所以，查看你的SSLSocket签名算法是否包含DSA，是的话就更换掉。若有其它原因，欢迎交流。

Android Keystore Changes

    With this release, the Android Keystore provider no longer supports DSA. ECDSA is still supported.    Keys which do not require encryption at rest will no longer be deleted when secure lock screen is disabled or reset (for example, by the user or a Device Administrator). Keys which require encryption at rest will be deleted during these events.

这是官方文档里的更改说明。