Swift3.0 - sha1加密算法

• 注意: 需要创建OC桥接文件, Bridging-Header.h
  #import <CommonCrypto/CommonHMAC.h>

extension String {    //sha1加密算法    func sha1() -> String{        let data : Data = self.data(using: String.Encoding.utf8, allowLossyConversion: true)!        var digest = [UInt8](repeating:0,count:Int(CC_SHA1_DIGEST_LENGTH))        let dataBytes = data.withUnsafeBytes { (bytes: UnsafePointer<UInt8>) -> UnsafePointer<UInt8> in            return bytes        }        let dataLength = CC_LONG(data.count)        CC_SHA1(dataBytes, dataLength, &digest)        let output = NSMutableString(capacity: Int(CC_SHA1_DIGEST_LENGTH))        for byte in digest{            output.appendFormat("%02x", byte)        }        return output as String    }}