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use blake2b_simd::Params;
pub fn blake2b_variable(ingest: &[u8], size: usize) -> Vec<u8> {
let hash = Params::new()
.hash_length(size)
.to_state()
.update(ingest)
.finalize();
hash.as_bytes().to_vec()
}
pub fn blake2b_256(ingest: &[u8]) -> [u8; 32] {
let digest = Params::new()
.hash_length(32)
.to_state()
.update(ingest)
.finalize();
let mut ret = [0u8; 32];
ret.clone_from_slice(digest.as_bytes());
ret
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn hash_length() {
let ingest = [1, 4, 2, 3];
let hash = blake2b_variable(&ingest, 8);
assert_eq!(hash.len(), 8);
let hash = blake2b_variable(&ingest, 20);
assert_eq!(hash.len(), 20);
let hash = blake2b_variable(&ingest, 32);
assert_eq!(hash.len(), 32);
}
#[test]
fn vector_hashing() {
let ing_vec = vec![1, 2, 3];
assert_eq!(blake2b_256(&ing_vec), blake2b_256(&[1, 2, 3]));
assert_ne!(blake2b_256(&ing_vec), blake2b_256(&[1, 2, 3, 4]));
}
}