extendhash

extendhash is a Rust library to compute hash extensions.

Supported hash algorithms:

• MD5
• SHA-0
• SHA-1
• SHA-256
• SHA-512

Usage

```rust use extendhash::sha256;

let secretdata = "This is a secret!".asbytes(); let hash = sha256::computehash(secretdata); let datalength = secretdata.len();

// Now we try computing a hash extension, // assuming that secret_data is not available. // We only need hash and data_length. let appendedmessage = "Appended message.".asbytes(); let combinedhash = sha256::extendhash( hash, datalength, appendedmessage);

// Now we verify that combined_hash matches the // concatenation (note the intermediate padding): let mut combineddata = Vec::::new(); combineddata.extendfromslice(secretdata); let padding = sha256::paddingforlength(datalength); combineddata.extendfromslice(padding.asslice()); combineddata.extendfromslice(appendedmessage); asserteq!( combinedhash, sha256::computehash(combineddata.as_slice())); ```

License

Licensed under either of

• Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.