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src/tools.rs: fix hex_to_digest

This commit is contained in:
Dietmar Maurer 2019-05-21 13:42:13 +02:00
parent 7f3d2ffab9
commit 11867a2b54
1 changed files with 9 additions and 4 deletions
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13
src/tools.rs
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@ -584,13 +584,18 @@ pub fn hex_to_digest(hex: &str) -> Result<[u8; 32], Error> {
if bytes.len() != 64 { bail!("got wrong digest length."); }
let val = |c| {
if c >= b'0' && c <= b'9' { return Ok(c - b'0'); }
if c >= b'a' && c <= b'f' { return Ok(c - b'a' + 10); }
if c >= b'A' && c <= b'F' { return Ok(c - b'A' + 10); }
bail!("found illegal hex character.");
};
let mut pos = 0;
for pair in bytes.chunks(2) {
if pos >= digest.len() { bail!("hex digest too long."); }
let mut h = pair[0];
if h >= b'0' && h <= b'f' { h = h - b'0'; } else { bail!("found illegal hex character."); }
let mut l = pair[1];
if l >= b'0' && l <= b'f' { l = l - b'0'; } else { bail!("found illegal hex character."); }
let h = val(pair[0])?;
let l = val(pair[1])?;
digest[pos] = (h<<4)|l;
pos +=1;
}