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@alrossi It looks like there are two things here. In the C++ Xrootd server (https://github.com/xrootd/xrootd/blob/master/src/XrdCrypto/XrdCryptosslCipher.cc#L1091), EVP_CipherUpdate() take a buffer with length of 48, and produce a decrypted hash of 32 bytes (so that 16 bytes in the second rectangular is not produced in C++ server!). This seems to be different from what you observer. So could this be the difference of C++ and Java implementation?

Also, I can set the buffer length to anything between 32 to 48 and it produce the same result. Client will get an error if I set it to 31 bytes. So this does indicate that the 16 byte in your first blue rectangular is not needed.

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