SD title export: Difference between revisions

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 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.
-This trail block itself is encrypted with AES CTR, and contains the nonce for decryption and size of the ES block:
+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
   0000010: xx nn nn nn nn nn nn nn nn nn nn nn nn yy yy yy