SHA Registers
Registers
| 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_INFIFO | 0x1000A080 | 0x40 | Boot9, Process9 |
SHA_CNT
| Bits | Description |
|---|---|
| 0 | Start (1=enable/busy, 0=idle) |
| 1 | Pad input |
| 2 | ? |
| 3 | Output Endianess (0=Little endian, 1=Big endian) |
| 4-5 | Mode (0=SHA256, 1=SHA224, 2=3=SHA1) |
| 6 | ? |
| 7 | ? |
| 8 | Unknown. When set, the *entire* ARM9 hangs/crashes when attempting to read SHA_INFIFO. |
| 9 | Unknown. This bit seems to be cleared by reading from SHA_INFIFO. |
| 10 | ? |
| 16 | ? |
| 17 | 1 when FIFO expects read/write |
SHA_BLKCNT
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, and the internal state during normal rounds. It is possible to write the internal state using this register.
SHA_INFIFO
The data to be hashed must be written here. It does not matter what offset is written to.