Function ring::limb::parse_big_endian_in_range_and_pad_consttime

pub fn parse_big_endian_in_range_and_pad_consttime(
    input: Input<'_>,
    allow_zero: AllowZero,
    max_exclusive: &[u64],
    result: &mut [u64],
) -> Result<(), Unspecified>

Parses input into result, verifies that the value is less than max_exclusive, and pads result with zeros to its length. If allow_zero is not AllowZero::Yes, zero values are rejected.

This attempts to be constant-time with respect to the actual value only if the value is actually in range. In other words, this won’t leak anything about a valid value, but it might leak small amounts of information about an invalid value (which constraint it failed).