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Merge tag '1.3.0' into xip-multivolume-expasion
# Conflicts: # Sources/xcodes/App.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| // | ||
| // Hashcash.swift | ||
| // | ||
| // | ||
| // Created by Matt Kiazyk on 2023-02-23. | ||
| // | ||
|
|
||
| import Foundation | ||
| import CryptoKit | ||
| import CommonCrypto | ||
|
|
||
| /* | ||
| # This App Store Connect hashcash spec was generously donated by... | ||
| # | ||
| # __ _ | ||
| # __ _ _ __ _ __ / _|(_) __ _ _ _ _ __ ___ ___ | ||
| # / _` || '_ \ | '_ \ | |_ | | / _` || | | || '__|/ _ \/ __| | ||
| # | (_| || |_) || |_) || _|| || (_| || |_| || | | __/\__ \ | ||
| # \__,_|| .__/ | .__/ |_| |_| \__, | \__,_||_| \___||___/ | ||
| # |_| |_| |___/ | ||
| # | ||
| # | ||
| */ | ||
| public struct Hashcash { | ||
| /// A function to returned a minted hash, using a bit and resource string | ||
| /// | ||
| /** | ||
| X-APPLE-HC: 1:11:20230223170600:4d74fb15eb23f465f1f6fcbf534e5877::6373 | ||
| ^ ^ ^ ^ ^ | ||
| | | | | +-- Counter | ||
| | | | +-- Resource | ||
| | | +-- Date YYMMDD[hhmm[ss]] | ||
| | +-- Bits (number of leading zeros) | ||
| +-- Version | ||
|
|
||
| We can't use an off-the-shelf Hashcash because Apple's implementation is not quite the same as the spec/convention. | ||
| 1. The spec calls for a nonce called "Rand" to be inserted between the Ext and Counter. They don't do that at all. | ||
| 2. The Counter conventionally encoded as base-64 but Apple just uses the decimal number's string representation. | ||
|
|
||
| Iterate from Counter=0 to Counter=N finding an N that makes the SHA1(X-APPLE-HC) lead with Bits leading zero bits | ||
| We get the "Resource" from the X-Apple-HC-Challenge header and Bits from X-Apple-HC-Bits | ||
| */ | ||
| /// - Parameters: | ||
| /// - resource: a string to be used for minting | ||
| /// - bits: grabbed from `X-Apple-HC-Bits` header | ||
| /// - date: Default uses Date() otherwise used for testing to check. | ||
| /// - Returns: A String hash to use in `X-Apple-HC` header on /signin | ||
| public func mint(resource: String, | ||
| bits: UInt = 10, | ||
| date: String? = nil) -> String? { | ||
|
|
||
| let ver = "1" | ||
|
|
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| var ts: String | ||
| if let date = date { | ||
| ts = date | ||
| } else { | ||
| let formatter = DateFormatter() | ||
| formatter.dateFormat = "yyMMddHHmmss" | ||
| ts = formatter.string(from: Date()) | ||
| } | ||
|
|
||
| let challenge = "\(ver):\(bits):\(ts):\(resource):" | ||
|
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| var counter = 0 | ||
|
|
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| while true { | ||
| guard let digest = ("\(challenge):\(counter)").sha1 else { | ||
| print("ERROR: Can't generate SHA1 digest") | ||
| return nil | ||
| } | ||
|
|
||
| if digest == bits { | ||
| return "\(challenge):\(counter)" | ||
| } | ||
| counter += 1 | ||
| } | ||
| } | ||
| } | ||
|
|
||
| extension String { | ||
| var sha1: Int? { | ||
|
|
||
| let data = Data(self.utf8) | ||
| var digest = [UInt8](repeating: 0, count:Int(CC_SHA1_DIGEST_LENGTH)) | ||
| data.withUnsafeBytes { | ||
| _ = CC_SHA1($0.baseAddress, CC_LONG(data.count), &digest) | ||
| } | ||
| let bigEndianValue = digest.withUnsafeBufferPointer { | ||
| ($0.baseAddress!.withMemoryRebound(to: UInt32.self, capacity: 1) { $0 }) | ||
| }.pointee | ||
| let value = UInt32(bigEndian: bigEndianValue) | ||
| return value.leadingZeroBitCount | ||
| } | ||
| } |
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