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feat: add merkletreeparent util functions
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,54 @@ | ||
package transaction | ||
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import ( | ||
"encoding/hex" | ||
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"github.com/bitcoin-sv/go-sdk/chainhash" | ||
crypto "github.com/bitcoin-sv/go-sdk/primitives/hash" | ||
"github.com/bitcoin-sv/go-sdk/util" | ||
) | ||
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// MerkleTreeParentStr returns the Merkle Tree parent of two Merkle | ||
// Tree children using hex strings instead of just bytes. | ||
func MerkleTreeParentStr(leftNode, rightNode string) (string, error) { | ||
l, err := hex.DecodeString(leftNode) | ||
if err != nil { | ||
return "", err | ||
} | ||
r, err := hex.DecodeString(rightNode) | ||
if err != nil { | ||
return "", err | ||
} | ||
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return hex.EncodeToString(MerkleTreeParent(l, r)), nil | ||
} | ||
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// MerkleTreeParent returns the Merkle Tree parent of two Merkle | ||
// Tree children. | ||
func MerkleTreeParent(leftNode, rightNode []byte) []byte { | ||
// swap endianness before concatenating | ||
l := util.ReverseBytes(leftNode) | ||
r := util.ReverseBytes(rightNode) | ||
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// concatenate leaves | ||
concat := append(l, r...) | ||
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// hash the concatenation | ||
hash := crypto.Sha256d(concat) | ||
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// swap endianness at the end and convert to hex string | ||
return util.ReverseBytes(hash) | ||
} | ||
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// MerkleTreeParentBytes returns the Merkle Tree parent of two Merkle Tree children. | ||
// The expectation is that the bytes are not reversed. | ||
func MerkleTreeParentBytes(l *chainhash.Hash, r *chainhash.Hash) *chainhash.Hash { | ||
lb := l.CloneBytes() | ||
rb := r.CloneBytes() | ||
concat := append(lb, rb...) | ||
hash, err := chainhash.NewHash(crypto.Sha256d(concat)) | ||
if err != nil { | ||
return &chainhash.Hash{} | ||
} | ||
return hash | ||
} |
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Original file line number | Diff line number | Diff line change |
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package transaction_test | ||
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import ( | ||
"encoding/hex" | ||
"testing" | ||
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"github.com/bitcoin-sv/go-sdk/transaction" | ||
"github.com/stretchr/testify/require" | ||
) | ||
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func TestGetMerkleTreeParentStr(t *testing.T) { | ||
leftNode := "d6c79a6ef05572f0cb8e9a450c561fc40b0a8a7d48faad95e20d93ddeb08c231" | ||
rightNode := "b1ed931b79056438b990d8981ba46fae97e5574b142445a74a44b978af284f98" | ||
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expected := "b0d537b3ee52e472507f453df3d69561720346118a5a8c4d85ca0de73bc792be" | ||
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parent, err := transaction.MerkleTreeParentStr(leftNode, rightNode) | ||
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require.NoError(t, err) | ||
require.Equal(t, expected, parent) | ||
} | ||
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func TestGetMerkleTreeParent(t *testing.T) { | ||
leftNode, _ := hex.DecodeString("d6c79a6ef05572f0cb8e9a450c561fc40b0a8a7d48faad95e20d93ddeb08c231") | ||
rightNode, _ := hex.DecodeString("b1ed931b79056438b990d8981ba46fae97e5574b142445a74a44b978af284f98") | ||
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expected, _ := hex.DecodeString("b0d537b3ee52e472507f453df3d69561720346118a5a8c4d85ca0de73bc792be") | ||
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parent := transaction.MerkleTreeParent(leftNode, rightNode) | ||
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require.Equal(t, expected, parent) | ||
} |