Crate rs_sha1

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SHA-1 rs_sha1 - Secure Hash Algorithm 1

The SHA-1 hash function is part of the SHA family, which was developed by the National Institute of Standards and Technology (NIST). While it has been deprecated for many cryptographic uses due to vulnerabilities to collision attacks, SHA-1 is still considered safe for non-cryptographic functions such as checksumming and fingerprinting.

Usage

The crate provides a simple and intuitive API. Users can create a new SHA-1 hasher instance, update it with input data, and finalize to get the resultant hash.

Example

Here is an example of how to use the SHA-1 hash function in Rust:

let mut sha1hasher = Sha1State::default().build_hasher();
sha1hasher.write(b"hello world");
let result = sha1hasher.finish();
assert_eq!(result, 0x2AAE6C35C94FCFB4);

Or, as a HashSet:

let hello = "hello";
let mut sha1hasher1 = Sha1Hasher::default();
let mut sha1hasher2 = Sha1Hasher::default();
let mut sha1hasher3 = Sha1Hasher::default();

sha1hasher1.write(hello.as_bytes());
hello.hash(&mut sha1hasher2);
sha1hasher3.write(hello.as_bytes());
sha1hasher3.write(&[0xFF]);

let u64result1 = sha1hasher1.finish();
let u64result2 = sha1hasher2.finish();
let u64result3 = sha1hasher3.finish();

assert_eq!(u64result1, 0xAAF4C61DDCC5E8A2);
assert_eq!(u64result2, 0xC8D8A4368F3A43D7);
assert_eq!(u64result2, u64result3);
assert_ne!(u64result1, u64result2);

Use Cases

While not recommended for cryptographic security, SHA-1 is often used in various non-security critical tasks, such as:

  • Git for version control uses SHA-1 not for security but for ensuring data integrity.
  • In checksumming, where a unique identifier for data is needed.
  • Fingerprinting, where unique identifiers are used to mark or identify unique data elements.

NIST advises against using SHA-1 for cryptographic functions due to potential vulnerabilities to collision attacks. For non-cryptographic functions, however, SHA-1 is still widely used and deemed safe.

Structs

  • Sha1Hasher
    Sha1Hasher is a type that provides the SHA-1 hashing algorithm in RustyShield.
  • Sha1State
    Sha1State represents the state of a SHA-1 hashing process.

Traits

  • HasherContext
    Overloads the finish Hasher method for a version that mutates itself