| //! SHA-256 hex helpers: `sha256hex` / `sha16` / `sha8` (bigpickle district-fabric.mjs:28-30). | |
| use sha2::{Digest, Sha256}; | |
| const HEX: &[u8; 16] = b"0123456789abcdef"; | |
| /// Full 64-char lowercase SHA-256 hex of `input`. | |
| pub fn sha256_hex(input: &str) -> String { | |
| let mut hasher = Sha256::new(); | |
| hasher.update(input.as_bytes()); | |
| let digest = hasher.finalize(); | |
| let mut out = String::with_capacity(64); | |
| for byte in digest { | |
| out.push(HEX[(byte >> 4) as usize] as char); | |
| out.push(HEX[(byte & 0x0f) as usize] as char); | |
| } | |
| out | |
| } | |
| /// First 16 hex chars of the SHA-256 of `input`. | |
| pub fn sha16(input: &str) -> String { | |
| let mut s = sha256_hex(input); | |
| s.truncate(16); | |
| s | |
| } | |
| /// First 8 hex chars of the SHA-256 of `input`. | |
| pub fn sha8(input: &str) -> String { | |
| let mut s = sha256_hex(input); | |
| s.truncate(8); | |
| s | |
| } | |