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use errors::*;
use crypto::digest::Digest;
use crypto::blake2b::Blake2b;
/// Helper to calculate a discovery key from a public key. 'key' should be 32 bytes; the returned
/// array will also be 32 bytes long.
///
/// dat discovery keys are calculated as a BLAKE2b "keyed hash" (using the passed key) of the string
/// "hypercore" (with no trailing null byte).
pub fn make_discovery_key(key: &[u8]) -> Vec<u8> {
let mut discovery_key = [0; 32];
let mut hash = Blake2b::new_keyed(32, key);
hash.input(&"hypercore".as_bytes());
hash.result(&mut discovery_key);
discovery_key.to_vec()
}
/// Helper to parse a dat address (aka, public key) in string format.
///
/// Address can start with 'dat://'. It should contain 64 hexadecimal characters.
pub fn parse_dat_address(input: &str) -> Result<Vec<u8>> {
let raw_key = if input.starts_with("dat://") {
&input[6..]
} else {
input
};
if raw_key.len() != 32 * 2 {
bail!("dat key not correct length");
}
let mut key_bytes = vec![];
for i in 0..32 {
let r = u8::from_str_radix(&raw_key[2 * i..2 * i + 2], 16);
match r {
Ok(b) => key_bytes.push(b),
Err(e) => bail!("Problem with hex: {}", e),
};
}
Ok(key_bytes)
}
#[test]
fn test_parse_dat_address() {
assert!(parse_dat_address(
"c7638882870abd4044d6467b0738f15e3a36f57c3a7f7f3417fd7e4e0841d597").is_ok());
assert!(parse_dat_address(
"C7638882870ABD4044D6467B0738F15E3A36F57C3A7F7F3417FD7E4E0841D597").is_ok());
assert!(parse_dat_address(
"dat://c7638882870abd4044d6467b0738f15e3a36f57c3a7f7f3417fd7e4e0841d597").is_ok());
assert!(parse_dat_address(
"c7638882870ab").is_err());
assert!(parse_dat_address(
"g7638882870abd4044d6467b0738f15e3a36f57c3a7f7f3417fd7e4e0841d597").is_err());
assert!(parse_dat_address(
"dat://c7638882870abd4044d6467b0738f15e3a36f57c3a7f7f3417fd7e4e0841d5970").is_err());
assert!(parse_dat_address(
"dat://c7638882870abd4044d6467b0738f15e3a36f57c3a7f7f3417fd7e4e0841d59").is_err());
}
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