AES Registers: Difference between revisions

← Older edit

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 == Endianness and word order ==
-When writing to the AES_CTR, AES_MAC or AES_KEY0/1/2/3 register, the hardware will process the written data according to the current input endianness specified in AES_CNT. This means that the byte ordering within each word is endian swapped accordingly but the word ordering of the register remains little endian.
+=== AES_CNT.input_endianness ===
+Swaps the bytes of 32-bit writes to AES_CTR, AES_WRFIFO, AES_KEY*FIFO according to specified endianness. AES_MAC?
+=== AES_CNT.output_endianness ===
+Swaps the bytes of 32-bit reads from AES_RDFIFO.
+=== AES_CNT.input_word_order ===
+If reversed, writes to AES_KEY*FIFO and AES_WRFIFO fill the FIFO backwards. For AES_WRFIFO, this means that every 16-byte block will have its words in the reverse order, but the order of these blocks remains the same. AES_CTR is unaffected by this field. AES_MAC?
+=== AES_CNT.output_word_order ===
+If reversed, reads from AES_RDFIFO will drain the FIFO backwards. This means that every 16-byte output block will have its words in the reverse order, but the order of these blocks remains the same.
 == CCM mode pitfall ==
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 | -
 | No
+|-
+| 0x20
+| [[System_SaveData|System Save Data]] encryption key during [[System_Transfer|System Transfers]]. See [[System_Transfer#System_Save_Data_Transfer|System Save Data Transfer]].
+| Bootrom.
+| NATIVE_FIRM
+| NATIVE_FIRM
+| Yes
 |-
 | 0x24
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 | Movable.sed key.
-This is the keyslot used for movable.sed encryption + AES-CBC MAC with the import/export [[FSPXI:ImportIntegrityVerificationSeed|commands]].
+This is the keyslot used for movable.sed encryption + AES-CBC MAC with the import/export [[FSPXI:ImportIntegrityVerificationSeed|commands]]. The keyYs used for crypto/CMAC are different, but both can be found in process9 rodata.
-| Bootrom.
 | Bootrom.
+| NATIVE_FIRM.
 | -
 | Yes
 |-
 | 0x36
-| Unknown. Used by friends module.
+| Used by the [[Friend_Services|the friends module]] for [[Friend_Services#Approach_Contexts|ApproachContext]] encryption. See [[FRDU:GetMyApproachContext]].
-See [[PSPXI:EncryptDecryptAes|EncryptDecryptAes]].
 | Bootrom.
 | Bootrom.