1  // Copyright (c) 2025 ADnet Contributors
 2  // This file is part of the AlphaVM library.
 3  
 4  // Licensed under the Apache License, Version 2.0 (the "License");
 5  // you may not use this file except in compliance with the License.
 6  // You may obtain a copy of the License at:
 7  
 8  // http://www.apache.org/licenses/LICENSE-2.0
 9  
10  // Unless required by applicable law or agreed to in writing, software
11  // distributed under the License is distributed on an "AS IS" BASIS,
12  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  // See the License for the specific language governing permissions and
14  // limitations under the License.
15  
16  use sha2::{Digest, Sha256};
17  
18  pub fn sha256(data: &[u8]) -> [u8; 32] {
19      let digest = Sha256::digest(data);
20      let mut ret = [0u8; 32];
21      ret.copy_from_slice(&digest);
22      ret
23  }
24  
25  pub fn double_sha256(data: &[u8]) -> [u8; 32] {
26      let digest = Sha256::digest(Sha256::digest(data));
27      let mut ret = [0u8; 32];
28      ret.copy_from_slice(&digest);
29      ret
30  }
31  
32  pub fn sha256d_to_u64(data: &[u8]) -> u64 {
33      let hash_slice = double_sha256(data);
34      let mut hash = [0u8; 8];
35      hash[..].copy_from_slice(&hash_slice[..8]);
36      u64::from_le_bytes(hash)
37  }