Hash using Swift + Common Crypto

Data+hash

//
//  Data+hash.swift
//  HashTools
//
//  Created by dede.exe on 17/09/18.
//  Copyright © 2018 dede.exe. All rights reserved.
//

import Foundation

extension Data {
    
    struct Hash {
        
        private var value : Data
        
        init(value:Data) {
            self.value = value
        }
        
        var md5 : Data {
            var value = self.value
            var digestData = Data(count: Int(CC_MD5_DIGEST_LENGTH))
            
            _ = digestData.withUnsafeMutableBytes { bytes in
                value.withUnsafeBytes{ valueBytes in
                    CC_MD5(valueBytes, CC_LONG(value.count), bytes)
                }
            }
            
            return digestData
        }
        
        var sha1 : Data {
            var value = self.value
            var digestData = Data(count: Int(CC_SHA1_DIGEST_LENGTH))
            
            _ = digestData.withUnsafeMutableBytes { bytes in
                value.withUnsafeBytes{ valueBytes in
                    CC_SHA1(valueBytes, CC_LONG(value.count), bytes)
                }
            }
            
            return digestData
        }

        var sha256 : Data {
            var value = self.value
            var digestData = Data(count: Int(CC_SHA256_DIGEST_LENGTH))
            
            _ = digestData.withUnsafeMutableBytes { bytes in
                value.withUnsafeBytes{ valueBytes in
                    CC_SHA256(valueBytes, CC_LONG(value.count), bytes)
                }
            }
            
            return digestData
        }
        
    }
    
    var hash : Hash {
        return Hash(value: self)
    }
    
}