20 lines
627 B
Plaintext
Executable File
20 lines
627 B
Plaintext
Executable File
import "../../casts/u32_to_bits";
|
|
import "../bool/pack256";
|
|
|
|
// pack 256 big-endian bits into one field element
|
|
// Note: This is not a injective operation as `p` is smaller than `2**256 - 1 for bn128
|
|
// For example, `[0, 0,..., 0]` and `bits(p)` both point to `0`
|
|
def main(u32[8] input) -> field {
|
|
bool[256] bits = [
|
|
...u32_to_bits(input[0]),
|
|
...u32_to_bits(input[1]),
|
|
...u32_to_bits(input[2]),
|
|
...u32_to_bits(input[3]),
|
|
...u32_to_bits(input[4]),
|
|
...u32_to_bits(input[5]),
|
|
...u32_to_bits(input[6]),
|
|
...u32_to_bits(input[7])
|
|
];
|
|
return pack256(bits);
|
|
}
|