
<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hi there,<div class=""><br class=""></div><div class="">We recently received a bug report in netty when JDK12 is used with ChaCha chiphers:</div><div class=""><br class=""></div><div class=""><a href="https://github.com/netty/netty/issues/9150" class="">https://github.com/netty/netty/issues/9150</a></div><div class=""><br class=""></div><div class="">Basically it seems like there is a problem in how it uses the ByteBuffer internally:</div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><pre style="box-sizing: border-box; font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, Courier, monospace; font-size: 11.899999618530273px; margin-bottom: 16px; margin-top: 0px; word-wrap: normal; background-color: rgb(246, 248, 250); border-top-left-radius: 3px; border-top-right-radius: 3px; border-bottom-right-radius: 3px; border-bottom-left-radius: 3px; line-height: 1.45; overflow: auto; padding: 16px; caret-color: rgb(36, 41, 46); color: rgb(36, 41, 46);" class=""><code style="box-sizing: border-box; font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, Courier, monospace; background-color: transparent; border-top-left-radius: 3px; border-top-right-radius: 3px; border-bottom-right-radius: 3px; border-bottom-left-radius: 3px; margin: 0px; padding: 0px; border: 0px; word-break: normal; display: inline; line-height: inherit; overflow: visible; word-wrap: normal;" class="">Caused by: java.lang.RuntimeException: javax.crypto.ShortBufferException: Output buffer too small

        at java.base/com.sun.crypto.provider.ChaCha20Cipher.engineDoFinal(ChaCha20Cipher.java:703)

        at java.base/javax.crypto.CipherSpi.bufferCrypt(CipherSpi.java:826)

        at java.base/javax.crypto.CipherSpi.engineDoFinal(CipherSpi.java:730)

        at java.base/javax.crypto.Cipher.doFinal(Cipher.java:2503)

        at java.base/sun.security.ssl.SSLCipher$T12CC20P1305ReadCipherGenerator$CC20P1305ReadCipher.decrypt(SSLCipher.java:2188)

        at java.base/sun.security.ssl.SSLEngineInputRecord.decodeInputRecord(SSLEngineInputRecord.java:240)

        at java.base/sun.security.ssl.SSLEngineInputRecord.decode(SSLEngineInputRecord.java:197)

        at java.base/sun.security.ssl.SSLEngineInputRecord.decode(SSLEngineInputRecord.java:160)

        at java.base/sun.security.ssl.SSLTransport.decode(SSLTransport.java:108)

        at java.base/sun.security.ssl.SSLEngineImpl.decode(SSLEngineImpl.java:681)

        at java.base/sun.security.ssl.SSLEngineImpl.readRecord(SSLEngineImpl.java:636)

        at java.base/sun.security.ssl.SSLEngineImpl.unwrap(SSLEngineImpl.java:454)

        ... 25 common frames omitted

Caused by: javax.crypto.ShortBufferException: Output buffer too small

        at java.base/com.sun.crypto.provider.ChaCha20Cipher$EngineAEADDec.doFinal(ChaCha20Cipher.java:1360)

        at java.base/com.sun.crypto.provider.ChaCha20Cipher.engineDoFinal(ChaCha20Cipher.java:701)</code></pre><div class=""><br class=""></div></div><div class=""><br class=""></div><div class="">Unfortunately I have no standalone reproducer yet but I just wanted to bring it up here in case it helps.</div><div class=""><br class=""></div><div class="">It only happens on JDK12 it seems. Check the Netty issue for more detailsâ€¦</div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">Bye</div><div class="">Norman</div><div class=""><br class=""></div></body></html>