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feat(sdk): add solana.Keccak256 - #11
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Keccak256(c, input, offset, length, output, outOffset) mirrors SHA256's bounded single-region contract and calls the runtime's sol_keccak256 syscall (by name on fogo-v0, by its static hash 0xd7793abb on solana-v3): Ethereum's Keccak-256 with the original 0x01 padding. Out-of-range requests return 2003 without a syscall; native contexts supply a Keccak callback, and a missing callback returns 2009. The C adapter lives in keccak.c.txt and is emitted only for programs that call Keccak256 (usesSDK), so every existing program keeps byte-identical C and ELFs; the pre-Check corpus still matches. Tests: native bounds/copy checks, a test-only reference Keccak-256 checked against published vectors, a native-Go/generated-C boundary differential, and a real-SBF suite on both profiles that compares whole and partial inputs from 0 to 10,240 bytes, across the 136-byte rate boundary, with the reference. The committed SDK-2 example snapshots are refreshed for the new API file.
paulbalaji
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This was referenced Oct 19, 2026
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Problem
Keccak-256 hashing runs on every Hyperlane message (message id, merkle tree, EIP-191). Without the syscall it has to be done in software in Go, which is far more expensive.
Solution
solana.Keccak256(c, input, offset, length, output, outOffset) uint64mirrorsSHA256's bounded contract and wrapssol_keccak256(fogo-v0 by name, solana-v3 hash0xd7793abb). That's Ethereum Keccak with 0x01 padding, not SHA3-256. Out-of-range requests return 2003 without a syscall.Tests
Linked work
Closes #1, together with #9, #10. If this merges first, #1 should stay open until the rest land. Used by hyperlane-xyz/hyperlane-monorepo#9852. Refreshes example SDK snapshots;
sdk_sha256conflicts with the other SDK PRs are mechanical.