feat(derive): route key derivation through SharedCoreKit

FlipcashCore/Package.swift

@@ -7,6 +7,7 @@ let package = Package(
     name: "FlipcashCore",
     platforms: [
         .iOS(.v18),
+        .macOS(.v15),
     ],
     products: [
         .library(

FlipcashCore/Sources/FlipcashCore/Solana/Keys/Derive.swift

@@ -7,85 +7,19 @@
 //
 
 import Foundation
+import SharedCoreKit
 
-public typealias KeyDescriptor = (key: Data, chain: Data)
-
-/// Deterministic wallet generation for ED25519 curve using SLIP-0010 spec
-/// Reference: https://github.com/satoshilabs/slips/blob/master/slip-0010.md
-///
 public enum Derive {
-
-    private static let curve: Data = Data("ed25519 seed".utf8)
-    private static let hardenedOffset: UInt32 = 0x80000000
-
-    static func masterKey(seed: Data) -> KeyDescriptor {
-        seed.hmac(using: curve).split32()
-    }
-
-    static func path(path: Path, seed: Data) -> (keyPair: KeyPair, chaincode: Data) {
-        var descriptor = masterKey(seed: seed)
-
-        path.indexes.forEach { index in
-            descriptor = CKDPriv(keyDescriptor: descriptor, index: hardenedOffset + index.value)
-        }
-
-        return (
-            KeyPair(seed: try! Seed32(descriptor.key)),
-            descriptor.chain
-        )
-    }
-
-    private static func CKDPriv(keyDescriptor: KeyDescriptor, index: UInt32) -> KeyDescriptor {
-        var entropy = Data()
-        entropy.append(0x00)
-        entropy.append(keyDescriptor.key)
-        entropy.append(contentsOf: index.bigEndian.bytes)
-
-        return entropy.hmac(using: keyDescriptor.chain).split32()
-    }
-}
+    private static let hardenedOffset: Int64 = 0x8000_0000
 
-/// Deterministic key derivation using BIP39
-/// Reference: https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki
-///
-extension Derive {
-
     static func seedUsingBIP39(phrase: [String], password: String = "") -> Key64 {
-        let phrase = phrase.joined(separator: " ")
-        let salt = "mnemonic\(password)"
-
-        let bytes = PBKDF.deriveKey(
-            algorithm: .sha512,
-            password: phrase,
-            salt: salt
-        )
-
-        return try! Key64(bytes)
+        try! Key64(SharedDerivation.seed(mnemonic: phrase, passphrase: password))
     }
-
-    public static func keyPairUsingBIP39(path: Path, phrase: [String], password: String = "") -> KeyPair {
-        let key64 = seedUsingBIP39(
-            phrase: phrase,
-            password: password
-        )
-
-        return Derive.path(path: path, seed: key64.data).keyPair
-    }
-}
-
-// MARK: - Data -
 
-private extension Data {
-
-    func split32() -> (Data, Data) {
-        let lhs = Data(self[0..<32])
-        let rhs = Data(self[32..<64])
-        return (lhs, rhs)
-    }
-
-    func hmac(using key: Data) -> Data {
-        var hmac = HMAC(algorithm: .sha512, key: key)
-        hmac.update(self)
-        return hmac.digestData()
+    public static func keyPairUsingBIP39(path: Path, phrase: [String], password: String = "") -> KeyPair {
+        let seed = seedUsingBIP39(phrase: phrase, password: password)
+        let hardenedIndexes = path.indexes.map { hardenedOffset + Int64($0.value) }
+        let derivedKey = SharedDerivation.derivedKey(seed: seed.data, hardenedIndexes: hardenedIndexes)
+        return KeyPair(seed: try! Seed32(derivedKey))
     }
 }

FlipcashCoreVectors/Package.swift

@@ -13,7 +13,7 @@ import PackageDescription
 let package = Package(
     name: "FlipcashCoreVectors",
     platforms: [
-        .macOS("14.0"), // FlipcashCore's transitive deps (BigDecimal 13.3, grpc/nio) need >= 13.3
+        .macOS("15.0"), // FlipcashCore's transitive deps (BigDecimal 13.3, grpc/nio) need >= 13.3
         .iOS("18.0"),
     ],
     dependencies: [