Crate extendhash

extendhash is a Rust crate to compute hash extensions.

Supported hash algorithms:

• MD5
• SHA-1

Example

use extendhash::sha1;

let secret_data = "This is a secret!".as_bytes();
let hash = sha1::compute_hash(secret_data);
let secret_data_length = secret_data.len();
 
// Now we try computing a hash extension, assuming that `secret_data`
// is not available. We only need `hash` and `secret_data_length`.
let appended_message = "Appended message.".as_bytes();
let combined_hash = sha1::extend_hash(hash, secret_data_length, appended_message);
 
// Now we verify that `combined_hash` matches the
// concatenation (note the intermediate padding):
let mut combined_data = Vec::<u8>::new();
combined_data.extend_from_slice(secret_data);
let intermediate_padding = sha1::padding_for_length(secret_data_length);
combined_data.extend_from_slice(intermediate_padding.as_slice());
combined_data.extend_from_slice(appended_message);
assert_eq!(combined_hash, sha1::compute_hash(combined_data.as_slice()));

Modules

md5	Compute MD5 hashes and hash extensions.
sha1	Compute SHA-1 hashes and hash extensions.