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
    }
}