/dev/sha
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/dev/sha is an IPC interface for the SHA-1 engine that accepts IOS_Open, IOS_Close & IOCTLV commands.
Internally in IOS, it uses 2 FDs: one of 0x10001 normally calculating SHA-1 hashes and 0x10002 when dealing with HMAC key hashes (also based on SHA). Despite this, it is better to do an IOS_Open when using this resource.
/dev/sha handles both SHA-1 hashing and HMAC verification in modular IOS versions (IOS28 and later). For monolithic IOS versions (IOS22 and earlier), HMAC verification is done in a dedicated separate device called /dev/hmac.
/dev/sha IOS_Ioctlv
| number | Description | in count | out count | vector | vector length |
|---|---|---|---|---|---|
| 0x00 | Initialize Hash Context | 1 | 2 | input data (64-byte aligned) | - |
| SHA-1 Context | 0x1c | ||||
| SHA-1 Hash | 0x14 | ||||
| 0x01 | Contribute Additional Data | 1 | 2 | input data (64-byte aligned) | - |
| SHA-1 Context | 0x1c | ||||
| SHA-1 Hash | 0x14 | ||||
| 0x02 | Finalize Hash | 1 | 2 | input data (64-byte aligned) | - |
| SHA-1 Context | 0x1c | ||||
| SHA-1 Hash | 0x14 | ||||
| 0x03 | ? | ? | ? | ? | ? |
| 0x04 | ? | ? | ? | ? | ? |
| 0x0F | some sort of H0,H1,H2 verifying | ? | ? | ? | ? |