CommonCrypto

MD5.swift

extension Array where Element == UInt8 {
    var md5Hash: [UInt8] {
        var hash = [UInt8](repeating: 0, count: Int(CC_MD5_DIGEST_LENGTH))
        CC_MD5(self, UInt32(self.count), &hash)
        return hash
    }
    
    var hexString : String {
        return self.reduce(into: "", { $0 += String(format: "%02x", $1) })
    }
}

let bytes = Array("Test".utf8)
let md5 = bytes.md5Hash.hexString
md5 == "0cbc6611f5540bd0809a388dc95a615b" // true