48 lines
1.2 KiB
Rust
48 lines
1.2 KiB
Rust
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use failure::{bail, Error};
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pub fn digest_to_hex(digest: &[u8]) -> String {
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const HEX_CHARS: &'static [u8; 16] = b"0123456789abcdef";
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let mut buf = Vec::<u8>::with_capacity(digest.len() * 2);
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for i in 0..digest.len() {
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buf.push(HEX_CHARS[(digest[i] >> 4) as usize]);
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buf.push(HEX_CHARS[(digest[i] & 0xf) as usize]);
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}
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unsafe { String::from_utf8_unchecked(buf) }
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}
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pub unsafe fn swapped_data_to_buf<T>(data: &T) -> &[u8] {
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std::slice::from_raw_parts(data as *const T as *const u8, std::mem::size_of::<T>())
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}
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fn hex_nibble(c: u8) -> Result<u8, Error> {
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Ok(match c {
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b'0'..=b'9' => c - b'0',
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b'a'..=b'f' => c - b'a' + 0xa,
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b'A'..=b'F' => c - b'A' + 0xa,
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_ => bail!("not a hex digit: {}", c as char),
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})
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}
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#[inline]
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pub fn parse_hex_digest<T: AsRef<[u8]>>(hex: T) -> Result<[u8; 32], Error> {
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let mut digest: [u8; 32] = unsafe { std::mem::uninitialized() };
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let hex = hex.as_ref();
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if hex.len() != 64 {
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bail!(
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"invalid hex digest ({} instead of 64 digits long)",
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hex.len()
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);
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}
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for i in 0..32 {
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digest[i] = (hex_nibble(hex[i * 2])? << 4) + hex_nibble(hex[i * 2 + 1])?;
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}
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Ok(digest)
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}
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