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Line 8: − + − This trail block itself is encrypted with AES CTR, and contains the nonce for decryption and size of the ES block:+
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An ES block, for lack of a better name, is a commonly used data encryption method on DSi by Nintendo.
An ES block, for lack of a better name, is a commonly used data encryption method on DSi by Nintendo.
It uses AES CCM to encrypt a maximum of 0x20000 bytes of data per time, and extends it with a 32 byte encrypted trail block at the end.
It uses AES CCM to encrypt a maximum of 0x20000 bytes of data per time, and extends it with a 32 byte trail block at the end.
The last 16 bytes of trail block itself is encrypted with AES CTR, and contains the nonce for decryption and size of the ES block:
0000000: qq qq qq qq qq qq qq qq qq qq qq qq qq qq qq qq
0000000: qq qq qq qq qq qq qq qq qq qq qq qq qq qq qq qq
0000010: xx nn nn nn nn nn nn nn nn nn nn nn nn yy yy yy
0000010: xx nn nn nn nn nn nn nn nn nn nn nn nn yy yy yy