Sha 256 Encryption syntax error in swift 3.0

Question

    func SHA256() -> String {

    let data = self.data(using: String.Encoding.utf8)
    let res = NSMutableData(length: Int(CC_SHA256_DIGEST_LENGTH))
    CC_SHA256((data! as NSData).bytes, CC_LONG(data!.count), UnsafeMutablePointer(res!.mutableBytes))
    let hashedString = "\(res!)".replacingOccurrences(of: "", with: "").replacingOccurrences(of: " ", with: "")
    let badchar: CharacterSet = CharacterSet(charactersIn: "\"<\",\">\"")
    let cleanedstring: String = (hashedString.components(separatedBy: badchar) as NSArray).componentsJoined(by: "")
    return cleanedstring

}

I am using this function to encrypt strings it was working fine in swift 2, now its not working in swift 3.0

Answer 1

Perfect solution Swift 3+:

 extension String {

    // MARK: - SHA256
    func get_sha256_String() -> String {
        guard let data = self.data(using: .utf8) else {
            print("Data not available")
            return ""
        }
        return getHexString(fromData: digest(input: data as NSData))
    }

    private func digest(input : NSData) -> NSData {
        let digestLength = Int(CC_SHA256_DIGEST_LENGTH)
        var hashValue = [UInt8](repeating: 0, count: digestLength)
        CC_SHA256(input.bytes, UInt32(input.length), &hashValue)
        return NSData(bytes: hashValue, length: digestLength)
    }

    private  func getHexString(fromData data: NSData) -> String {
        var bytes = [UInt8](repeating: 0, count: data.length)
        data.getBytes(&bytes, length: data.length)

        var hexString = ""
        for byte in bytes {
            hexString += String(format:"%02x", UInt8(byte))
        }
        return hexString
    }
}

How to use:

let desiredSHA256 = "yourString".get_sha256_String()