38 lines
976 B
Rust
38 lines
976 B
Rust
|
use sha2::{Digest, Sha256};
|
||
|
|
|
||
|
|
pub enum PubkeyDecodeError {
|
||
|
|
BadChecksum,
|
||
|
|
BadFormat,
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Decode pubkey from base 58
|
||
|
|
/// Verify checksum if provided
|
||
|
|
/// Accepts any checksum length >=3
|
||
|
|
pub fn format_pubkey(raw: &str) -> Result<String, PubkeyDecodeError> {
|
||
|
|
let mut iter = raw.splitn(2, ':');
|
||
|
|
let mut pubkey = [0u8; 32];
|
||
|
|
bs58::decode(iter.next().ok_or(PubkeyDecodeError::BadFormat)?)
|
||
|
|
.into(&mut pubkey)
|
||
|
|
.map_err(|_| PubkeyDecodeError::BadFormat)?;
|
||
|
|
|
||
|
|
let mut hasher1 = Sha256::new();
|
||
|
|
hasher1.update(&pubkey.as_ref()[..32]);
|
||
|
|
let mut hasher2 = Sha256::new();
|
||
|
|
hasher2.update(hasher1.finalize());
|
||
|
|
let checksum = bs58::encode(hasher2.finalize()).into_string();
|
||
|
|
|
||
|
|
if let Some(given_checksum) = iter.next() {
|
||
|
|
if given_checksum.len() < 3 {
|
||
|
|
return Err(PubkeyDecodeError::BadFormat);
|
||
|
|
}
|
||
|
|
if !checksum.starts_with(given_checksum) {
|
||
|
|
return Err(PubkeyDecodeError::BadChecksum);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
Ok(format!(
|
||
|
|
"{}:{}",
|
||
|
|
bs58::encode(pubkey).into_string(),
|
||
|
|
&checksum[..3]
|
||
|
|
))
|
||
|
|
}
|