swift sha256 encryption
extension String { func sha256() -> String{ if let stringData = self.data(using: String.Encoding.utf8) { return hexStringFromData(input: digest(input: stringData as NSData)) } return "" } private func digest(input : NSData) -> NSData { let digestLength = Int(CC_SHA256_DIGEST_LENGTH) var hash = [UInt8](repeating: 0, count: digestLength) CC_SHA256(input.bytes, UInt32(input.length), &hash) return NSData(bytes: hash, length: digestLength) } private func hexStringFromData(input: NSData) -> String { var bytes = [UInt8](repeating: 0, count: input.length) input.getBytes(&bytes, length: input.length) var hexString = "" for byte in bytes { hexString += String(format:"%02x", UInt8(byte)) } return hexString } }
