Generate HMAC String-Swift

A Hash-based message authentication Algorithm

import Foundation
import CryptoKit
import CommonCrypto

class HmacDigest {
static func getHmac()->String{
let hMAC = “your string”.hmac(algorithm: .SHA512, key: “your key”)
return hMAC
}
}

extension String {
func hmac(key: String) -> String {
var digest = [UInt8](repeating: 0, count: Int(CC_SHA256_DIGEST_LENGTH))
CCHmac(CCHmacAlgorithm(kCCHmacAlgSHA256), key, key.count, self, self.count, &digest)
let data = Data(bytes: digest,count:Int(CC_SHA256_DIGEST_LENGTH))
return data.base64EncodedString(options: Data.Base64EncodingOptions(rawValue: 0))
}

func hmac(algorithm: HMACAlgorithm, key: String) -> String {
let cKey = key.cString(using: String.Encoding.utf8)
let cData = self.cString(using: String.Encoding.utf8)
var result = [CUnsignedChar](repeating: 0, count: Int(algorithm.digestLength()))
CCHmac(algorithm.toCCHmacAlgorithm(), cKey!, strlen(cKey!), cData!, strlen(cData!), &result)
let hmacData:NSData = NSData(bytes: result, length: (Int(algorithm.digestLength())))
let hmacBase64 = hmacData.base64EncodedString(options: .lineLength64Characters)
return String(hmacBase64)
}
}

enum HMACAlgorithm {
case MD5, SHA1, SHA224, SHA256, SHA384, SHA512
func toCCHmacAlgorithm() -> 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)
}

func digestLength() -> Int {
var result: CInt = 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)
}
}

Happy Coding!!