Fix CVE-2016-6225 in 2.4 #267
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Blueprint checksum-unencrypted-chunk [https://blueprints.launchpad.net/percona-xtrabackup/+spec/checksum-unencrypted-chunk] This patch changes xbcrypt format as following: 1. Bump XBCRYPT header version number, current is "XBCRYP03" 2. Append 32-byte SHA256 hash of the plaintext to the payload of each chunk 3. Encrypt plaintext payload and hash all together 4. Both original length and encrypted length fields of the chunk header are calculated including these extra 32 bytes.
* 2.3-xb-pxb-186: CVE-2016-6225: xtrabackup encryption is not setting the IV correctly
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