SHA Registers
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Registers[edit]
| Old3DS | Name | Address | Width | Used by |
|---|---|---|---|---|
| Yes | SHA_CNT | 0x1000A000 | 4 | Boot9, Process9 |
| Yes | SHA_BLKCNT | 0x1000A004 | 4 | Process9 |
| Yes | SHA_HASH | 0x1000A040 | 0x20 | Process9 |
| Yes | SHA_FIFO | 0x1000A080 | 0x40 | Boot9, Process9 |
SHA_CNT[edit]
| Bits | Description |
|---|---|
| 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 | ? |
| 17 | ? |
Bit 8 is used when boot9 chains eMMC reads with AES and SHA to to load, decrypt and verify FIRM partitions.
SHA_BLKCNT[edit]
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[edit]
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[edit]
The data to be hashed must be written here. It does not matter what offset is written to.