• 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
    }
}