33 lines
1.0 KiB
Swift
33 lines
1.0 KiB
Swift
import Foundation
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import CommonCrypto
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import CryptoKit
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func uuidv5(name: String, namespace: UUID) -> UUID {
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var spaceUID = namespace.uuid
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var data = withUnsafePointer(to: &spaceUID) { [count = MemoryLayout.size(ofValue: spaceUID)] in
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Data(bytes: $0, count: count)
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}
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data.append(contentsOf: name.utf8)
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// Compute SHA1 digest
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var digest = [UInt8](repeating: 0, count: Int(CC_SHA1_DIGEST_LENGTH))
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data.withUnsafeBytes { (ptr: UnsafeRawBufferPointer) -> Void in CC_SHA1(ptr.baseAddress, CC_LONG(data.count), &digest) }
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// Set version bits:
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digest[6] = digest[6] & 0x0F | UInt8(5) << 4
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// Set variant bits:
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digest[8] = digest[8] & 0x3F | 0x80
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// Create a tuple for the final UUID
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var uuidTuple = namespace.uuid
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withUnsafeMutablePointer(to: &uuidTuple) { pointer in
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let bound = pointer.withMemoryRebound(to: UInt8.self, capacity: 16) { $0 }
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digest.enumerated().forEach { (bound + $0.offset).pointee = $0.element }
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}
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// Convert digest to UUID and return
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return UUID(uuid: uuidTuple)
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}
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