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Keccakf32Memory: use compute_from instead of provide_value #2553

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merged 6 commits into from
Mar 18, 2025
Merged

Keccakf32Memory: use compute_from instead of provide_value #2553

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4c5e3fd
Keccakf32Memory: use compute_from instead of provide_value
georgwiese Mar 14, 2025
1c15647
Only require the elements actually needed
georgwiese Mar 14, 2025
b0e93ac
Use compute_from_multi
georgwiese Mar 16, 2025
4616435
Hard-code lengths
georgwiese Mar 16, 2025
f14d12c
Remove unnecessary prover functions
georgwiese Mar 18, 2025
d00db1b
Reintroduce array::len calls for clarity
georgwiese Mar 18, 2025
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88 changes: 50 additions & 38 deletions std/machines/hash/keccakf32_memory.asm
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,7 @@ use std::convert::fe;
use std::prelude::set_hint;
use std::prelude::Query;
use std::prover::eval;
use std::prover::provide_value;
use std::prover::compute_from;
use std::machines::large_field::memory::Memory;

machine Keccakf32Memory(mem: Memory) with
Expand Down Expand Up @@ -592,22 +592,19 @@ machine Keccakf32Memory(mem: Memory) with
// }
// }

let query_c: int, int, int -> int = query |x, limb, bit_in_limb|
utils::fold(
5,
|y| (int(eval(a[y * 10 + x * 2 + limb])) >> bit_in_limb) & 0x1,
0,
|acc, e| acc ^ e
);

query |row| {
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I think this could be something like

query |row| compute_from_multi(c, row, a, |a_values| {
  array::new(array::len(c), |i| {
     let x = i / 64;
     let z = i % 64;
     let limb = z / 32;
     let bit_in_limb = z % 32;
//      compute c here
  })
});

let _ = array::map_enumerated(c, |i, c_i| {
let x = i / 64;
let z = i % 64;
let limb = z / 32;
let bit_in_limb = z % 32;

provide_value(c_i, row, fe(query_c(x, limb, bit_in_limb)));
let a_elems = array::new(5, |y| a[y * 10 + x * 2 + limb]);

compute_from(
c_i, row, a_elems,
|a_elems_fe| fe(utils::fold(
5, |y| (int(a_elems_fe[y]) >> bit_in_limb) & 0x1, 0, |acc, e| acc ^ e)))
});
};

Expand All @@ -622,17 +619,18 @@ machine Keccakf32Memory(mem: Memory) with
// }
// }

let query_c_prime: int, int -> int = query |x, z|
int(eval(c[x * 64 + z])) ^
int(eval(c[((x + 4) % 5) * 64 + z])) ^
int(eval(c[((x + 1) % 5) * 64 + (z + 63) % 64]));

query |row| {
let _ = array::map_enumerated(c_prime, |i, c_i| {
let x = i / 64;
let z = i % 64;

provide_value(c_i, row, fe(query_c_prime(x, z)));
let c_elems = [
c[x * 64 + z],
c[((x + 4) % 5) * 64 + z],
c[((x + 1) % 5) * 64 + (z + 63) % 64]
];

compute_from(c_i, row, c_elems, |c_elems_fe| fe(int(c_elems_fe[0]) ^ int(c_elems_fe[1]) ^ int(c_elems_fe[2])));
});
};

Expand All @@ -652,10 +650,6 @@ machine Keccakf32Memory(mem: Memory) with
// }
// }

let query_a_prime: int, int, int, int, int -> int = query |x, y, z, limb, bit_in_limb|
((int(eval(a[y * 10 + x * 2 + limb])) >> bit_in_limb) & 0x1) ^
int(eval(c[x * 64 + z])) ^
int(eval(c_prime[x * 64 + z]));

query |row| {
let _ = array::map_enumerated(a_prime, |i, a_i| {
Expand All @@ -665,7 +659,14 @@ machine Keccakf32Memory(mem: Memory) with
let limb = z / 32;
let bit_in_limb = z % 32;

provide_value(a_i, row, fe(query_a_prime(x, y, z, limb, bit_in_limb)));
let a_elem = a[y * 10 + x * 2 + limb];
let c_elem = c[x * 64 + z];
let c_prime_elem = c_prime[x * 64 + z];

compute_from(
a_i, row, [a_elem, c_elem, c_prime_elem],
|inputs| fe(((int(inputs[0]) >> bit_in_limb) & 0x1) ^ int(inputs[1]) ^ int(inputs[2]))
);
});
};

Expand All @@ -687,13 +688,23 @@ machine Keccakf32Memory(mem: Memory) with
// }
// }

let query_a_prime_prime: int, int, int -> int = query |x, y, limb|

let b_index: int, int, int -> int = |x, y, z| {
let a: int = (x + 3 * y) % 5;
let rot: int = R[a * 5 + x]; // b = x
x * 320 + a * 64 + (z + 64 - rot) % 64
};
let andn_int: int, int -> int = |a, b| (1 - a) * b;

let query_a_prime_prime: int, int, int, fe[] -> int = query |x, y, limb, a_prime|
utils::fold(
32,
|z|
int(eval(b(x, y, (limb + 1) * 32 - 1 - z))) ^
int(eval(andn(b((x + 1) % 5, y, (limb + 1) * 32 - 1 - z),
b((x + 2) % 5, y, (limb + 1) * 32 - 1 - z)))),
|z|
int(a_prime[b_index(x, y, (limb + 1) * 32 - 1 - z)]) ^
int(andn_int(
int(a_prime[b_index((x + 1) % 5, y, (limb + 1) * 32 - 1 - z)]),
int(a_prime[b_index((x + 2) % 5, y, (limb + 1) * 32 - 1 - z)])
)),
0,
|acc, e| acc * 2 + e
);
Expand All @@ -704,7 +715,8 @@ machine Keccakf32Memory(mem: Memory) with
let x = (i / 2) % 5;
let limb = i % 2;

provide_value(a_i, row, fe(query_a_prime_prime(x, y, limb)));
// Seems to be faster to require all 5 * 5 * 64 elements of a_prime
compute_from(a_i, row, a_prime, |a_prime| fe(query_a_prime_prime(x, y, limb, a_prime)));
});
};

Expand All @@ -730,10 +742,11 @@ machine Keccakf32Memory(mem: Memory) with
let limb = i / 32;
let bit_in_limb = i % 32;

provide_value(
compute_from(
a_i,
row,
fe((int(eval(a_prime_prime[limb])) >> bit_in_limb) & 0x1)
row,
a_prime_prime,
|a_prime_prime| fe((int(a_prime_prime[limb]) >> bit_in_limb) & 0x1)
);
});
};
Expand All @@ -745,17 +758,16 @@ machine Keccakf32Memory(mem: Memory) with
// F::from_canonical_u16(row.a_prime_prime[0][0][limb].as_canonical_u64() as u16 ^ rc_lo);
// }

let query_a_prime_prime_prime_0_0_limbs: int, int -> int = query |round, limb|
int(eval(a_prime_prime[limb])) ^
((RC[round] >> (limb * 32)) & 0xffffffff);

query |row| {
let _ = array::new(2, |limb| {
provide_value(
let a_prime_prime_elem = a_prime_prime[limb];

compute_from(
a_prime_prime_prime_0_0_limbs[limb],
row,
fe(query_a_prime_prime_prime_0_0_limbs(row % NUM_ROUNDS, limb)
));
row,
[a_prime_prime_elem],
|inputs| fe(int(inputs[0]) ^ ((RC[row % NUM_ROUNDS] >> (limb * 32)) & 0xffffffff))
);
});
};
}
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