ink_engine 5.1.1

[ink!] Off-chain environment for testing.
Documentation 
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// Copyright (C) Use Ink (UK) Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

//! Implementations of supported cryptographic hash functions.

/// Conduct the BLAKE2 256-bit hash and place the result into `output`.
pub fn blake2b_256(input: &[u8], output: &mut [u8; 32]) {
    use ::blake2::digest::{
        consts::U32,
        Digest as _,
    };

    type Blake2b256 = ::blake2::Blake2b<U32>;

    let mut blake2 = Blake2b256::new();
    blake2.update(input);
    let result = blake2.finalize();
    output.copy_from_slice(&result);
}

/// Conduct the BLAKE2 128-bit hash and place the result into `output`.
pub fn blake2b_128(input: &[u8], output: &mut [u8; 16]) {
    use ::blake2::digest::{
        consts::U16,
        Digest as _,
    };

    type Blake2b128 = ::blake2::Blake2b<U16>;

    let mut blake2 = Blake2b128::new();
    blake2.update(input);
    let result = blake2.finalize();
    output.copy_from_slice(&result);
}

/// Conduct the KECCAK 256-bit hash and place the result into `output`.
pub fn keccak_256(input: &[u8], output: &mut [u8; 32]) {
    use sha3::{
        digest::generic_array::GenericArray,
        Digest as _,
    };
    let mut hasher = sha3::Keccak256::new();
    hasher.update(input);
    hasher.finalize_into(<&mut GenericArray<u8, _>>::from(&mut output[..]));
}

/// Conduct the SHA-2 256-bit hash and place the result into `output`.
pub fn sha2_256(input: &[u8], output: &mut [u8; 32]) {
    use sha2::{
        digest::generic_array::GenericArray,
        Digest as _,
    };
    let mut hasher = sha2::Sha256::new();
    hasher.update(input);
    hasher.finalize_into(<&mut GenericArray<u8, _>>::from(&mut output[..]));
}

#[cfg(test)]
mod tests {
    use super::*;

    static TEST_INPUT: &[u8] = b"DEAD_BEEF";

    #[test]
    fn test_hash_keccak_256() {
        let mut output = [0x00_u8; 32];
        keccak_256(TEST_INPUT, &mut output);
        assert_eq!(
            output,
            [
                24, 230, 209, 59, 127, 30, 158, 244, 60, 177, 132, 150, 167, 244, 64, 69,
                184, 123, 185, 44, 211, 199, 208, 179, 14, 64, 126, 140, 217, 69, 36,
                216
            ]
        );
    }

    #[test]
    fn test_hash_sha2_256() {
        let mut output = [0x00_u8; 32];
        sha2_256(TEST_INPUT, &mut output);
        assert_eq!(
            output,
            [
                136, 15, 25, 218, 88, 54, 49, 152, 115, 168, 147, 189, 207, 171, 243,
                129, 161, 76, 15, 141, 197, 106, 111, 213, 19, 197, 133, 219, 181, 233,
                195, 120
            ]
        );
    }

    #[test]
    fn test_hash_blake2_256() {
        let mut output = [0x00_u8; 32];
        blake2b_256(TEST_INPUT, &mut output);
        assert_eq!(
            output,
            [
                244, 247, 235, 182, 194, 161, 28, 69, 34, 106, 237, 7, 57, 87, 190, 12,
                92, 171, 91, 176, 135, 52, 247, 94, 8, 112, 94, 183, 140, 101, 208, 120
            ]
        );
    }

    #[test]
    fn test_hash_blake2_128() {
        let mut output = [0x00_u8; 16];
        blake2b_128(TEST_INPUT, &mut output);
        assert_eq!(
            output,
            [
                180, 158, 48, 21, 171, 163, 217, 175, 145, 160, 25, 159, 213, 142, 103,
                242
            ]
        );
    }
}