/// RFC4648 encoding table
const RFC4648_ALPHABET: &'static [u8] = b"ABCDEFGHIJKLMNOPQRSTUVWXYZ234567";
+/// Zbase encoding alphabet
+const ZBASE_ALPHABET: &'static [u8] = b"ybndrfg8ejkmcpqxot1uwisza345h769";
+
/// RFC4648 decoding table
const RFC4648_INV_ALPHABET: [i8; 43] = [
-1, -1, 26, 27, 28, 29, 30, 31, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8,
9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,
];
+/// Zbase decoding table
+const ZBASE_INV_ALPHABET: [i8; 43] = [
+ -1, 18, -1, 25, 26, 27, 30, 29, 7, 31, -1, -1, -1, -1, -1, -1, -1, 24, 1, 12, 3, 8, 5, 6, 28,
+ 21, 9, 10, -1, 11, 2, 16, 13, 14, 4, 22, 17, 19, -1, 20, 15, 0, 23,
+];
+
/// Alphabet used for encoding and decoding.
#[derive(Copy, Clone)]
pub enum Alphabet {
RFC4648 {
/// Whether to use padding.
padding: bool
- }
+ },
+ /// Zbase32 encoding.
+ ZBase32
}
impl Alphabet {
return String::from_utf8(ret).expect("Invalid UTF-8");
}
ret
- }
+ },
+ Self::ZBase32 => {
+ Self::encode_data(data, ZBASE_ALPHABET)
+ },
};
ret.truncate(output_length);
});
}
(&data[..unpadded_data_length], RFC4648_INV_ALPHABET)
+ },
+ Self::ZBase32 => {
+ (data, ZBASE_INV_ALPHABET)
}
};
// If the string has more characters than are required to alphabet_encode the number of bytes
mod tests {
use super::*;
+ const ZBASE32_TEST_DATA: &[(&str, &[u8])] = &[
+ ("", &[]),
+ ("yy", &[0x00]),
+ ("oy", &[0x80]),
+ ("tqrey", &[0x8b, 0x88, 0x80]),
+ ("6n9hq", &[0xf0, 0xbf, 0xc7]),
+ ("4t7ye", &[0xd4, 0x7a, 0x04]),
+ ("6im5sdy", &[0xf5, 0x57, 0xbb, 0x0c]),
+ ("ybndrfg8ejkmcpqxot1uwisza345h769", &[0x00, 0x44, 0x32, 0x14, 0xc7, 0x42, 0x54, 0xb6,
+ 0x35, 0xcf, 0x84, 0x65, 0x3a, 0x56, 0xd7, 0xc6,
+ 0x75, 0xbe, 0x77, 0xdf])
+ ];
+
+ #[test]
+ fn test_zbase32_encode() {
+ for &(zbase32, data) in ZBASE32_TEST_DATA {
+ assert_eq!(Alphabet::ZBase32.encode(data), zbase32);
+ }
+ }
+
+ #[test]
+ fn test_zbase32_decode() {
+ for &(zbase32, data) in ZBASE32_TEST_DATA {
+ assert_eq!(Alphabet::ZBase32.decode(zbase32).unwrap(), data);
+ }
+ }
+
+ #[test]
+ fn test_decode_wrong() {
+ const WRONG_DATA: &[&str] = &["00", "l1", "?", "="];
+ for &data in WRONG_DATA {
+ match Alphabet::ZBase32.decode(data) {
+ Ok(_) => assert!(false, "Data shouldn't be decodable"),
+ Err(_) => assert!(true),
+ }
+ }
+ }
+
const RFC4648_NON_PADDED_TEST_VECTORS: &[(&[u8], &[u8])] = &[
(&[0xF8, 0x3E, 0x7F, 0x83, 0xE7], b"7A7H7A7H"),
(&[0x77, 0xC1, 0xF7, 0x7C, 0x1F], b"O7A7O7A7"),