ASMR asm-functions are coming in the future Tact v1.5.0 release, so you can tap into the power of TVM directly.

This will be valid Tact code⚡️:

asm fun keccak256(s: Slice): Int {
    1 INT HASHEXT_KECCAK256
}

// … more stuff …

let h = keccak256(yourSlice);

— The Tact team

♨️ @tact_kitchen