HMAC SHA 256 returns different value from javascript - swift

Question

I need to generate the same hash value as the site below.
https://cryptii.com/pipes/hmac
If the key is aaaa and the message is a
The expected hash value is e29f14beeb21a8ee1d1c3b8c2be4cf440584da4d46aff5bacb2ae9aa7deb3271.
But the result is 8c21ecf95763195811ac0513bfa42a29be13b9d895b896af45e115dde9bc7382
Below is my code I don't know what's wrong.
I am wasting 6 hours now... so PLEASE HELP ME... : (
import CommonCrypto
import CryptoKit
enum CryptoAlgorithm {
case MD5, SHA1, SHA224, SHA256, SHA384, SHA512
var HMACAlgorithm: CCHmacAlgorithm {
var result: Int = 0
switch self {
case .MD5: result = kCCHmacAlgMD5
case .SHA1: result = kCCHmacAlgSHA1
case .SHA224: result = kCCHmacAlgSHA224
case .SHA256: result = kCCHmacAlgSHA256
case .SHA384: result = kCCHmacAlgSHA384
case .SHA512: result = kCCHmacAlgSHA512
}
return CCHmacAlgorithm(result)
}
var digestLength: Int {
var result: Int32 = 0
switch self {
case .MD5: result = CC_MD5_DIGEST_LENGTH
case .SHA1: result = CC_SHA1_DIGEST_LENGTH
case .SHA224: result = CC_SHA224_DIGEST_LENGTH
case .SHA256: result = CC_SHA256_DIGEST_LENGTH
case .SHA384: result = CC_SHA384_DIGEST_LENGTH
case .SHA512: result = CC_SHA512_DIGEST_LENGTH
}
return Int(result)
}
}
extension String {
func hmac(algorithm: CryptoAlgorithm, key: String) -> String {
let str = self.cString(using: String.Encoding.utf8)
let strLen = Int(self.lengthOfBytes(using: String.Encoding.utf8))
let digestLen = algorithm.digestLength
let result = UnsafeMutablePointer<CUnsignedChar>.allocate(capacity: digestLen)
let keyStr = key.cString(using: String.Encoding.utf8)
let keyLen = Int(key.lengthOfBytes(using: String.Encoding.utf8))
CCHmac(algorithm.HMACAlgorithm, keyStr!, keyLen, str!, strLen, result)
let digest = stringFromResult(result: result, length: digestLen)
result.deallocate()
result.deinitialize(count: digestLen)
return digest
}
private func stringFromResult(result: UnsafeMutablePointer<CUnsignedChar>, length: Int) -> String {
let hash = NSMutableString()
for i in 0..<length {
hash.appendFormat("%02x", result[i])
}
return String(hash).lowercased()
}
}
public extension Data {
/**
Method creates bytes array from given Data
- Returns: Array of bytes
*/
func bytesArray<T: ExpressibleByIntegerLiteral>() -> [T] {
var bytes = Array<T>(repeating: 0, count: self.count)
(self as NSData).getBytes(&bytes, length:self.count * MemoryLayout<T>.size)
return bytes
}
}
public extension String {
/**
Method creates bytes array from given String
- Returns: Array of bytes
*/
func bytesArray<T: ExpressibleByIntegerLiteral>() -> [T] {
let data = self.data(using: String.Encoding.utf8)!
return data.bytesArray()
}
}
extension Data {
struct HexEncodingOptions: OptionSet {
let rawValue: Int
static let upperCase = HexEncodingOptions(rawValue: 1 << 0)
}
func hexEncodedString(options: HexEncodingOptions = []) -> String {
let format = options.contains(.upperCase) ? "%02hhX" : "%02hhx"
return map { String(format: format, $0) }.joined()
}
var hexDescription: String {
return reduce("") {$0 + String(format: "%02x", $1)}
}
}
print("a".hmac(algorithm: .SHA256, key: Data("aaaa".utf8).hexEncodedString()))
print("a".hmac(algorithm: .SHA256, key: "aaaa").data(using: .utf8)?.base64EncodedString().description)