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Combine Hashing Function into Single Op Code #579

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32 changes: 9 additions & 23 deletions src/fuel-vm/instruction-set.md
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Original file line number Diff line number Diff line change
Expand Up @@ -110,8 +110,7 @@
- [`ECK1`: Secp251k1 signature recovery](#eck1-secp256k1-signature-recovery)
- [`ECR1`: Secp256r1 signature recovery](#ecr1-secp256r1-signature-recovery)
- [`ED19`: EdDSA curve25519 verification](#ed19-eddsa-curve25519-verification)
- [`K256`: keccak-256](#k256-keccak-256)
- [`S256`: SHA-2-256](#s256-sha-2-256)
- [`HASH`: cryptographic hashing](#hash-cryptographic-hashing)
- [Other Instructions](#other-instructions)
- [`ECAL`: Call external function](#ecal-call-external-function)
- [`FLAG`: Set flags](#flag-set-flags)
Expand Down Expand Up @@ -2333,33 +2332,20 @@ Verification are specified [here](../protocol/cryptographic-primitives.md#eddsa-

If there is an error in verification, `$err` is set to `1`, otherwise `$err` is cleared.

### `K256`: keccak-256
### `HASH`: cryptographic hashing

| | |
|-------------|-------------------------------------------------------|
| Description | The keccak-256 hash of `$rC` bytes starting at `$rB`. |
| Operation | ```MEM[$rA, 32] = keccak256(MEM[$rB, $rC]);``` |
| Syntax | `k256 $rA, $rB, $rC` |
| Encoding | `0x00 rA rB rC -` |
| Description | The hash of `$rC` bytes starting at `$rB` with hashing mode at `rD`. |
| Operation | ```MEM[$rA, 32] = hash(MEM[$rB, $rC], $rD);``` |
| Syntax | `hash $rA, $rB, $rC, $rD` |
| Encoding | `0x00 rA rB rC rD` |
| Notes | |

Panic if:

- `$rA + 32` overflows
- `$rB + $rC` overflows
- `$rA + 32 > VM_MAX_RAM`
- `$rB + $rC > VM_MAX_RAM`
- The memory range `MEM[$rA, 32]` does not pass [ownership check](./index.md#ownership)

### `S256`: SHA-2-256
Available Hashing Modes:

| | |
|-------------|------------------------------------------------------|
| Description | The SHA-2-256 hash of `$rC` bytes starting at `$rB`. |
| Operation | ```MEM[$rA, 32] = sha256(MEM[$rB, $rC]);``` |
| Syntax | `s256 $rA, $rB, $rC` |
| Encoding | `0x00 rA rB rC -` |
| Notes | |
- `0`: sha-2-256
- `1`: keccak-256

Panic if:

Expand Down