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src/lib.rs: add hex_to_bin and bin_to_hex

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This commit is contained in:
Dietmar Maurer 2019-06-17 10:59:59 +02:00
parent f2716a0d26
commit 64d9e81c76
1 changed files with 27 additions and 0 deletions
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27
proxmox-tools/src/lib.rs
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@ -16,6 +16,10 @@ macro_rules! offsetof {
const HEX_CHARS: &'static [u8; 16] = b"0123456789abcdef";
pub fn digest_to_hex(digest: &[u8]) -> String {
bin_to_hex(digest)
}
pub fn bin_to_hex(digest: &[u8]) -> String {
let mut buf = Vec::<u8>::with_capacity(digest.len()*2);
for i in 0..digest.len() {
@ -26,6 +30,29 @@ pub fn digest_to_hex(digest: &[u8]) -> String {
unsafe { String::from_utf8_unchecked(buf) }
}
pub fn hex_to_bin(hex: &str) -> Result<Vec<u8>, Error> {
let mut result = vec![];
let bytes = hex.as_bytes();
if (bytes.len() % 2) != 0 { bail!("hex_to_bin: got wrong input 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.");
};
for pair in bytes.chunks(2) {
let h = val(pair[0])?;
let l = val(pair[1])?;
result.push((h<<4)|l);
}
Ok(result)
}
pub fn hex_to_digest(hex: &str) -> Result<[u8; 32], Error> {
let mut digest = [0u8; 32];