SHA Registers: Difference between revisions
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= Registers = | |||
{| class="wikitable" border="1" | {| class="wikitable" border="1" | ||
! | ! Old3DS | ||
! | ! Name | ||
! | ! Address | ||
! Width | |||
! Used by | |||
|- | |- | ||
| | | style="background: green" | Yes | ||
| [[#SHA_CNT|SHA_CNT]] | |||
| 0x1000A000 | | 0x1000A000 | ||
| 4 | | 4 | ||
| Boot9, Process9 | |||
|- | |- | ||
| | | style="background: green" | Yes | ||
| [[#SHA_BLKCNT|SHA_BLKCNT]] | |||
| 0x1000A004 | | 0x1000A004 | ||
| 4 | | 4 | ||
| Process9 | |||
|- | |- | ||
| | | style="background: green" | Yes | ||
| [[#SHA_HASH|SHA_HASH]] | |||
| 0x1000A040 | | 0x1000A040 | ||
| 0x20 | | 0x20 | ||
| Process9 | |||
|- | |- | ||
| | | style="background: green" | Yes | ||
| [[#SHA_FIFO|SHA_FIFO]] | |||
| 0x1000A080 | | 0x1000A080 | ||
| 0x40 | | 0x40 | ||
| Boot9, Process9 | |||
|} | |} | ||
== SHA_CNT == | |||
== | |||
{| class="wikitable" border="1" | {| class="wikitable" border="1" | ||
! Bits | ! Bits | ||
! Description | ! Description | ||
|- | |- | ||
| 0-1 | | 0 | ||
| 0= | | Start (1=enable/busy, 0=idle) | ||
|- | |||
| 1 | |||
| Final round (1=enable/busy, 0=normal) | |||
|- | |||
| 2 | |||
| Input DMA enable (1= enable, 0=disable) | |||
|- | |||
| 3 | |||
| Output Endianess (0=little, 1=big) | |||
|- | |||
| 4-5 | |||
| Mode (0=SHA256, 1=SHA224, 2=3=SHA1) | |||
|- | |||
| 6 | |||
| ? | |||
|- | |||
| 7 | |||
| ? | |||
|- | |- | ||
| | | 8 | ||
| | | Clear FIFO? When set, the *entire* ARM9 hangs/crashes when attempting to read SHA_INFIFO. | ||
|- | |- | ||
| | | 9 | ||
| | | Enable FIFO (1=fifo, 0=write-only) | ||
|- | |- | ||
| | | 10 | ||
| | | Output DMA enable (1= enable, 0=disable) | ||
|- | |- | ||
| 16 | | 16 | ||
| | | ? | ||
|- | |- | ||
| 17 | | 17 | ||
| | | ? | ||
|} | |} | ||
Bit 8 is used when boot9 chains eMMC reads with AES and SHA to to load, decrypt and verify FIRM partitions. | |||
== | == SHA_BLKCNT == | ||
This reg contains the total size of the data written to REG_SHA_IN. | This reg contains the total size of the data written to REG_SHA_IN, this field is updated when performing hash-function final-round. | ||
== | == SHA_HASH == | ||
This reg contains the SHA* hash after the final round. | This reg contains the SHA* hash after the final round, and the internal state during normal rounds. It is possible to write the internal state using this register. | ||
== | == SHA_FIFO == | ||
The data to be hashed must be written here. | The data to be hashed must be written here. It does not matter what offset is written to. | ||