NBip32Fast

High perfomance BIP-32 HD key derivation library for .NET 8

Usage

Basic

var secp256k1Key = Secp256K1.Secp256K1HdKey.Instance.DerivePath("m/44'/0'/0'/0/0", seed).Key;
var nistP256Key = NistP256.NistP256HdKey.Instance.DerivePath("m/44'/0'/0'/0/0", seed).Key;
var ed25519Key = Ed25519.Ed25519HdKey.Instance.DerivePath("m/44'/0'/0'/0'/0'", seed).Key;

Optimised

var master = Ed25519.Ed25519HdKey.Instance.DerivePath("m/44'/888'/0'/0'", seed);
var accounts = new List<byte[]>();

for (var i = 0u; i < 5u; i++)
{
    accounts.Add(Ed25519.Ed25519HdKey.Instance.GetPublic(Ed25519.Ed25519HdKey.Instance.Derive(master, new KeyPathElement(i, true)).Key));
}

Benchmarks

Intel Core i9-14900K, 1 CPU, 32 logical and 24 physical cores

SecP256K1

Method	Mean	Error	StdDev	Gen0	Gen1	Allocated
NBip39FastKey	37.91 us	0.112 us	0.105 us	0.0610	-	2.04 KB
NBitcoinKey	448.31 us	1.104 us	1.033 us	0.4883	-	9.38 KB
NetezosKey	619.23 us	4.850 us	4.537 us	168.9453	0.9766	3112.87 KB

Ed25519

Method	Mean	Error	StdDev	Gen0	Allocated
NBip32FastKey	4.572 us	0.0104 us	0.0097 us	0.0839	1.59 KB
NetezosKey	5.796 us	0.0257 us	0.0241 us	0.3204	5.95 KB
P3HdKey	6.173 us	0.0103 us	0.0126 us	0.3357	6.28 KB

NistP256

Method	Mean	Error	StdDev	Gen0	Gen1	Allocated
NBip39FastKey	161.6 us	0.19 us	0.17 us	-	-	1.93 KB
NetezosKey	1,429.4 us	10.00 us	8.86 us	373.0469	1.9531	6888.66 KB

Benchmark code

TODOs

Ed25519 soft derivation scheme (used in Cardano)
KeyPathTree for efficient computing (for multiple keypath merging and index depth)
HDKey refactoring with public key lazy addition
Secp256K1 public key without Span<byte> to byte[] conversion
- All providers ReadOnlySpan<byte> public keys
More testing

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