github.com/evdatsion/aphelion-dpos-bft@v0.32.1/crypto/merkle/rfc6962_test.go (about)

     1  package merkle
     2  
     3  // Copyright 2016 Google Inc. All Rights Reserved.
     4  //
     5  // Licensed under the Apache License, Version 2.0 (the "License");
     6  // you may not use this file except in compliance with the License.
     7  // You may obtain a copy of the License at
     8  //
     9  //     http://www.apache.org/licenses/LICENSE-2.0
    10  //
    11  // Unless required by applicable law or agreed to in writing, software
    12  // distributed under the License is distributed on an "AS IS" BASIS,
    13  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14  // See the License for the specific language governing permissions and
    15  // limitations under the License.
    16  // These tests were taken from https://github.com/google/trillian/blob/master/merkle/rfc6962/rfc6962_test.go,
    17  // and consequently fall under the above license.
    18  import (
    19  	"bytes"
    20  	"encoding/hex"
    21  	"testing"
    22  
    23  	"github.com/evdatsion/aphelion-dpos-bft/crypto/tmhash"
    24  )
    25  
    26  func TestRFC6962Hasher(t *testing.T) {
    27  	_, leafHashTrail := trailsFromByteSlices([][]byte{[]byte("L123456")})
    28  	leafHash := leafHashTrail.Hash
    29  	_, leafHashTrail = trailsFromByteSlices([][]byte{{}})
    30  	emptyLeafHash := leafHashTrail.Hash
    31  	for _, tc := range []struct {
    32  		desc string
    33  		got  []byte
    34  		want string
    35  	}{
    36  		// Since creating a merkle tree of no leaves is unsupported here, we skip
    37  		// the corresponding trillian test vector.
    38  
    39  		// Check that the empty hash is not the same as the hash of an empty leaf.
    40  		// echo -n 00 | xxd -r -p | sha256sum
    41  		{
    42  			desc: "RFC6962 Empty Leaf",
    43  			want: "6e340b9cffb37a989ca544e6bb780a2c78901d3fb33738768511a30617afa01d"[:tmhash.Size*2],
    44  			got:  emptyLeafHash,
    45  		},
    46  		// echo -n 004C313233343536 | xxd -r -p | sha256sum
    47  		{
    48  			desc: "RFC6962 Leaf",
    49  			want: "395aa064aa4c29f7010acfe3f25db9485bbd4b91897b6ad7ad547639252b4d56"[:tmhash.Size*2],
    50  			got:  leafHash,
    51  		},
    52  		// echo -n 014E3132334E343536 | xxd -r -p | sha256sum
    53  		{
    54  			desc: "RFC6962 Node",
    55  			want: "aa217fe888e47007fa15edab33c2b492a722cb106c64667fc2b044444de66bbb"[:tmhash.Size*2],
    56  			got:  innerHash([]byte("N123"), []byte("N456")),
    57  		},
    58  	} {
    59  		t.Run(tc.desc, func(t *testing.T) {
    60  			wantBytes, err := hex.DecodeString(tc.want)
    61  			if err != nil {
    62  				t.Fatalf("hex.DecodeString(%x): %v", tc.want, err)
    63  			}
    64  			if got, want := tc.got, wantBytes; !bytes.Equal(got, want) {
    65  				t.Errorf("got %x, want %x", got, want)
    66  			}
    67  		})
    68  	}
    69  }
    70  
    71  func TestRFC6962HasherCollisions(t *testing.T) {
    72  	// Check that different leaves have different hashes.
    73  	leaf1, leaf2 := []byte("Hello"), []byte("World")
    74  	_, leafHashTrail := trailsFromByteSlices([][]byte{leaf1})
    75  	hash1 := leafHashTrail.Hash
    76  	_, leafHashTrail = trailsFromByteSlices([][]byte{leaf2})
    77  	hash2 := leafHashTrail.Hash
    78  	if bytes.Equal(hash1, hash2) {
    79  		t.Errorf("Leaf hashes should differ, but both are %x", hash1)
    80  	}
    81  	// Compute an intermediate subtree hash.
    82  	_, subHash1Trail := trailsFromByteSlices([][]byte{hash1, hash2})
    83  	subHash1 := subHash1Trail.Hash
    84  	// Check that this is not the same as a leaf hash of their concatenation.
    85  	preimage := append(hash1, hash2...)
    86  	_, forgedHashTrail := trailsFromByteSlices([][]byte{preimage})
    87  	forgedHash := forgedHashTrail.Hash
    88  	if bytes.Equal(subHash1, forgedHash) {
    89  		t.Errorf("Hasher is not second-preimage resistant")
    90  	}
    91  	// Swap the order of nodes and check that the hash is different.
    92  	_, subHash2Trail := trailsFromByteSlices([][]byte{hash2, hash1})
    93  	subHash2 := subHash2Trail.Hash
    94  	if bytes.Equal(subHash1, subHash2) {
    95  		t.Errorf("Subtree hash does not depend on the order of leaves")
    96  	}
    97  }