shrincs-simplicity-verifier/utils.simf at main · BlockstreamResearch/shrincs-simplicity-verifier · GitHub

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#ifndef IMPORTED_UTILS_SIMF
#define IMPORTED_UTILS_SIMF

fn eq_128(val1: u128, val2: u128) -> bool {
    jet::eq_256(<(u128, u128)>::into((0, val1)), <(u128, u128)>::into((0, val2)))
}

fn right_shift_256(value: u256, shift: u8) -> u256 {
    let (a, b, c, d): (u64, u64, u64, u64) = <u256>::into(value);

    let (a, b, c, d): (u64, u64, u64, u64) = match jet::lt_8(shift, 64) {
        true => (a, b, c, d),
        false => {
            match jet::lt_8(shift, 128) {
                true => (0, a, b, c),
                false => {
                    match jet::lt_8(shift, 192) {
                        true => (0, 0, a, b),
                        false => (0, 0, 0, a),
                    }
                }
            }
        }
    };

    let shift: u8 = jet::modulo_8(shift, 64);
    let (_, left_shift): (bool, u8) = jet::subtract_8(64, shift);

    let new_d: u64 = jet::or_64(jet::left_shift_64(left_shift, c), jet::right_shift_64(shift, d));
    let new_c: u64 = jet::or_64(jet::left_shift_64(left_shift, b), jet::right_shift_64(shift, c));
    let new_b: u64 = jet::or_64(jet::left_shift_64(left_shift, a), jet::right_shift_64(shift, b));
    let new_a: u64 = jet::right_shift_64(shift, a);

    <(u64, u64, u64, u64)>::into((new_a, new_b, new_c, new_d))
}

fn right_shift_128(value: u128, shift: u8) -> u128 {
    let (a, b, c, d): (u32, u32, u32, u32) = <u128>::into(value);

    let (a, b, c, d): (u32, u32, u32, u32) = match jet::lt_8(shift, 32) {
        true => (a, b, c, d),
        false => {
            match jet::lt_8(shift, 64) {
                true => (0, a, b, c),
                false => {
                    match jet::lt_8(shift, 96) {
                        true => (0, 0, a, b),
                        false => (0, 0, 0, a),
                    }
                }
            }
        }
    };

    let shift: u8 = jet::modulo_8(shift, 32);
    let (_, left_shift): (bool, u8) = jet::subtract_8(32, shift);

    let new_d: u32 = jet::or_32(jet::left_shift_32(left_shift, c), jet::right_shift_32(shift, d));
    let new_c: u32 = jet::or_32(jet::left_shift_32(left_shift, b), jet::right_shift_32(shift, c));
    let new_b: u32 = jet::or_32(jet::left_shift_32(left_shift, a), jet::right_shift_32(shift, b));
    let new_a: u32 = jet::right_shift_32(shift, a);

    <(u32, u32, u32, u32)>::into((new_a, new_b, new_c, new_d))
}

fn get_bit_at(value: u256, possition: u8) -> u1 {
    let (a, b, c, d): (u64, u64, u64, u64) = <u256>::into(value);

    let part: u64 = match jet::lt_8(possition, 64) {
        true => d,
        false => {
            match jet::lt_8(possition, 128) {
                true => c,
                false => {
                    match jet::lt_8(possition, 192) {
                        true => b,
                        false => a,
                    }
                },
            }
        },
    };

    let (_, in_part_possition): (u8, u8) = jet::div_mod_8(possition, 64);

    <bool>::into(jet::lt_64(0, jet::and_64(part, jet::left_shift_64(in_part_possition, 1))))
}

fn get_byte_at(value: u256, possition: u8) -> u8 {
    assert!(jet::lt_8(possition, 32));
    let (a, b, c, d): (u64, u64, u64, u64) = <u256>::into(value);

    let part: u64 = match jet::lt_8(possition, 8) {
        true => d,
        false => {
            match jet::lt_8(possition, 16) {
                true => c,
                false => {
                    match jet::lt_8(possition, 24) {
                        true => b,
                        false => a,
                    }
                },
            }
        },
    };

    let possition: u8 = jet::modulo_8(possition, 8);
    let (a, b, c, d): (u16, u16, u16, u16) = <u64>::into(part);

    let part: u16 = match jet::lt_8(possition, 2) {
        true => d,
        false => {
            match jet::lt_8(possition, 4) {
                true => c,
                false => {
                    match jet::lt_8(possition, 6) {
                        true => b,
                        false => a,
                    }
                },
            }
        },
    };

    let possition: u8 = jet::modulo_8(possition, 2);
    let (a, b): (u8, u8) = <u16>::into(part);
    match jet::eq_8(possition, 0) {
        true => b,
        false => a,
    }
}

fn get_byte_at_128(value: u128, possition: u8) -> u8 {
    assert!(jet::lt_8(possition, 16));
    let (a, b, c, d): (u32, u32, u32, u32) = <u128>::into(value);

    let part: u32 = match jet::lt_8(possition, 4) {
        true => a,
        false => {
            match jet::lt_8(possition, 8) {
                true => b,
                false => {
                    match jet::lt_8(possition, 12) {
                        true => c,
                        false => d,
                    }
                },
            }
        },
    };

    let possition: u8 = jet::modulo_8(possition, 4);
    let (a, b, c, d): (u8, u8, u8, u8) = <u32>::into(part);

    match jet::eq_8(possition, 0) {
        true => a,
        false => {
            match jet::eq_8(possition, 1) {
                true => b,
                false => {
                    match jet::eq_8(possition, 2) {
                        true => c,
                        false => d,
                    }
                },
            }
        },
    }
}

fn get_at_array_iter(el: u256, ctx: (u8, u8, u256)) -> (u8, u8, u256) {
    let (idx, pos, saved): (u8, u8, u256) = ctx;
    match jet::eq_8(idx, pos) {
        true => {
            let (_, new_pos): (bool, u8) = jet::add_8(pos, 1);
            (idx, new_pos, el)
        },
        false => {
            let (_, new_pos): (bool, u8) = jet::add_8(pos, 1);
            (idx, new_pos, saved)
        }
    }
}

#define DEFINE_GET_AT_ARR(N) \
fn get_at_array_##N(arr: [u256; N], index: u8) -> u256 { \
    let (_, _, el): (u8, u8, u256) = array_fold::<get_at_array_iter, N>(arr, (index, 0, 0)); \
    el \
}

fn get_at_array_128_iter(el: u128, ctx: (u32, u32, u128)) -> (u32, u32, u128) {
    let (idx, pos, saved): (u32, u32, u128) = ctx;
    match jet::eq_32(idx, pos) {
        true => {
            let (_, new_pos): (bool, u32) = jet::add_32(pos, 1);
            (idx, new_pos, el)
        },
        false => {
            let (_, new_pos): (bool, u32) = jet::add_32(pos, 1);
            (idx, new_pos, saved)
        }
    }
}

#define DEFINE_GET_AT_ARR_128(N) \
fn get_at_array_128_##N(arr: [u128; N], index: u32) -> u128 { \
    let (_, _, el): (u32, u32, u128) = array_fold::<get_at_array_128_iter, N>(arr, (index, 0, 0)); \
    el \
}

#endif