A Rust port of the JavaScript hashids implementation. It generates YouTube-like hashes from one or many numbers. Use hashids when you do not want to expose your database ids to the user. Website: http://www.hashids.org/
hashids (Hash ID's) creates short, unique, decodeable hashes from unsigned (long) integers.
It was designed for websites to use in URL shortening, tracking stuff, or making pages private (or at least unguessable).
This algorithm tries to satisfy the following requirements:
- Hashes must be unique and decodable.
- They should be able to contain more than one integer (so you can use them in complex or clustered systems).
- You should be able to specify minimum hash length.
- Hashes should not contain basic English curse words (since they are meant to appear in public places - like the URL).
Instead of showing items as 1, 2, or 3, you could show them as U6dc, u87U, and HMou.
You don't have to store these hashes in the database, but can encode + decode on the fly.
All (long) integers need to be greater than or equal to zero.
extern crate hashids;
use hashids::HashIds;see tests/lib.rs
You can pass a unique salt value so your hashes differ from everyone else's. I use "this is my salt" as an example.
let ids_some = HashIds::new_with_salt("this is my salt".to_string());
let ids = match ids_some {
Ok(v) => { v }
Err(e) => {
println!("error");
return;
}
};
let numbers: Vec<i64> = vec![12345];
let encode = ids.encode(&numbers);hash is now going to be:
NkK9
Notice during decoding, same salt value is used:
let longs = ids.decode("NkK9".to_string());
for s in longs.iter() {
println!("longs: {}", s);
}numbers is now going to be:
[ 12345 ]
Decryption will not work if salt is changed:
let ids_some = HashIds::new_with_salt("this is my salt".to_string());
let ids = match ids_some {
Ok(v) => { v }
Err(e) => {
println!("error");
return;
}
};
let numbers = ids.decode("NkK9");numbers is now going to be:
[]
let ids_some = HashIds::new_with_salt("this is my salt".to_string());
let ids = match ids_some {
Ok(v) => { v }
Err(e) => {
println!("error");
return;
}
};
let numbers: Vec<i64> = vec![683, 94108, 123, 5];
let encode = ids.encode(&numbers);hash is now going to be:
aBMswoO2UB3Sj
let ids_some = HashIds::new_with_salt("this is my salt".to_string());
let ids = match ids_some {
Ok(v) => { v }
Err(e) => {
println!("error");
return;
}
};
let longs = ids.decode("NkK9".to_string());
for s in longs.iter() {
println!("longs: {}", s);
}numbers is now going to be:
[ 683, 94108, 123, 5 ]
Here we encode integer 1, and set the minimum hash length to 8 (by default it's 0 -- meaning hashes will be the shortest possible length).
let ids_some = HashIds::new_with_salt_and_min_length("this is my salt".to_string(), 8);
let ids = match ids_some {
Ok(v) => { v }
Err(e) => {
println!("error");
return;
}
};
let numbers : Vec<i64> = vec![1];
let encode = ids.encode(&numbers);hash is now going to be:
gB0NV05e
let ids_some = HashIds::new_with_salt_and_min_length("this is my salt".to_string(), 8);
let ids = match ids_some {
Ok(v) => { v }
Err(e) => {
println!("error");
return;
}
};
let numbers = ids.decode("gB0NV05e")numbers is now going to be:
[ 1 ]
Here we set the alphabet to consist of only four letters: "0123456789abcdef"
let ids_some = HashIds::new("this is my salt".to_string(), 0, "0123456789abcdef".to_string());
let ids = match ids_some {
Ok(v) => { v }
Err(e) => {
println!("error");
return;
}
};
let numbers : Vec<i64> = vec![1234567];
hashids.encode(&numbers);hash is now going to be:
b332db5
The primary purpose of hashids is to obfuscate ids. It's not meant or tested to be used for security purposes or compression. Having said that, this algorithm does try to make these hashes unguessable and unpredictable:
let ids_some = HashIds::new_with_salt("this is my salt".to_string());
let ids = match ids_some {
Ok(v) => { v }
Err(e) => {
println!("error");
return;
}
};
let numbers: Vec<i64> = vec![5, 5, 5, 5];
let encode = ids.encode(&numbers);You don't see any repeating patterns that might show there's 4 identical numbers in the hash:
1Wc8cwcE
Same with incremented numbers:
let ids_some = HashIds::new_with_salt("this is my salt".to_string());
let ids = match ids_some {
Ok(v) => { v }
Err(e) => {
println!("error");
return;
}
};
let numbers: Vec<i64> = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
let encode = ids.encode(&numbers);hash will be :
kRHnurhptKcjIDTWC3sx
let ids_some = HashIds::new_with_salt("this is my salt".to_string());
let ids = match ids_some {
Ok(v) => { v }
Err(e) => {
println!("error");
return;
}
};
let numbers_1: Vec<i64> = vec![1];
let encode_1 = ids.encode(&numbers_1);
let numbers_2: Vec<i64> = vec![2];
let encode_2 = ids.encode(&numbers_2);
let numbers_3: Vec<i64> = vec![3];
let encode_3 = ids.encode(&numbers_3);
let numbers_4: Vec<i64> = vec![4];
let encode_4 = ids.encode(&numbers_4);
let numbers_5: Vec<i64> = vec![5];
let encode_5 = ids.encode(&numbers_5);I wrote this class with the intent of placing these hashes in visible places - like the URL. If I create a unique hash for each user, it would be unfortunate if the hash ended up accidentally being a bad word. Imagine auto-creating a URL with hash for your user that looks like this - http://example.com/user/a**hole
Therefore, this algorithm tries to avoid generating most common English curse words with the default alphabet. This is done by never placing the following letters next to each other:
c, C, s, S, f, F, h, H, u, U, i, I, t, T
Follow me @charsyam, @IvanAkimov
MIT License. See the LICENSE file.
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