如何使用ios swift将字符串转换为MD5哈希 [英] How to convert string to MD5 hash using ios swift

问题描述

我想转换用户输入或假设任何字符串如abc到MD5哈希。我想在ios swift中这样做。我已经提到了下面的链接，但解决方案对我不起作用，或者我很难实现它，因为我是快速编程的新手。有人可以通过明确的步骤来帮助我实现这一目标。提前致谢！

I want to convert user input or assume any string like "abc" to MD5 hash. I want to do this in ios swift. I have refered the below links but the solutions are not working for me or I am confused to implement it properly as i am new to swift programing. Could someone help me with clear steps to achieve this. Thanks in advance!

导入Swift框架中的CommonCrypto

如何在快速语言中使用CC_MD5方法。

http://iosdeveloperzone.com/2014/10/03/using-commoncrypto-in-swift/

为了更清楚，我希望像在php中一样快速实现这一点。

To be more clear i want to achieve this in swift like what we do in php.

$str = "Hello";

echo md5($str);

输出：8b1a9953c4611296a827abf8c47804d7

Output: 8b1a9953c4611296a827abf8c47804d7

推荐答案

有两个步骤：

1.从字符串创建md5数据

2.将md5数据转换为十六进制字符串

There are two steps:
1. Create md5 data from a string
2. Covert the md5 data to a hex string

Swift 2.0

Swift 2.0

func md5(string string: String) -> String {
    var digest = [UInt8](count: Int(CC_MD5_DIGEST_LENGTH), repeatedValue: 0)
    if let data = string.dataUsingEncoding(NSUTF8StringEncoding) {
        CC_MD5(data.bytes, CC_LONG(data.length), &digest)
    }

    var digestHex = ""
    for index in 0..<Int(CC_MD5_DIGEST_LENGTH) {
        digestHex += String(format: "%02x", digest[index])
    }

    return digestHex
}

//Test:
let digest = md5(string:"Hello")
print("digest: \(digest)")

输出：

摘要：8b1a9953c4611296a827abf8c47804d7

digest: 8b1a9953c4611296a827abf8c47804d7

Swift 3.0：

Swift 3.0:

func MD5(string: String) -> Data {
    let messageData = string.data(using:.utf8)!
    var digestData = Data(count: Int(CC_MD5_DIGEST_LENGTH))

    _ = digestData.withUnsafeMutableBytes {digestBytes in
        messageData.withUnsafeBytes {messageBytes in
            CC_MD5(messageBytes, CC_LONG(messageData.count), digestBytes)
        }
    }

    return digestData
}

//Test:
let md5Data = MD5(string:"Hello")

let md5Hex =  md5Data.map { String(format: "%02hhx", $0) }.joined()
print("md5Hex: \(md5Hex)")

let md5Base64 = md5Data.base64EncodedString()
print("md5Base64: \(md5Base64)")

输出：

md5Hex：8b1a9953c4611296a827abf8c47804d7

md5Base64：ixqZU8RhEpaoJ6v4xHgE1w ==

md5Hex: 8b1a9953c4611296a827abf8c47804d7
md5Base64: ixqZU8RhEpaoJ6v4xHgE1w==

注意：

#import<必须将CommonCrypto / CommonCrypto.h> 添加到Bridging-Header文件

Notes:
#import <CommonCrypto/CommonCrypto.h> must be added to a Bridging-Header file

有关如何创建桥接头的信息，请参阅此SO答案。

For how to create a Bridging-Header see this SO answer.

一般情况下，MD5不应用于新工作，SHA256是当前的最佳做法。

In general MD5 should not be used for new work, SHA256 is a current best practice.

MD2，MD4，MD5 ，SHA1，SHA224，SHA256，SHA384，SHA512（Swift 3 +）

这些函数将散列字符串或数据输入使用八种加密哈希算法之一。

These functions will hash either String or Data input with one of eight cryptographic hash algorithms.

name参数将哈希函数名称指定为字符串

支持函数是MD2，MD4，MD5，SHA1，SHA224，SHA256，SHA384和SHA512
a
这个例子需要Common Crypto

必须有一个桥接头到项目：< br>
#import< CommonCrypto / CommonCrypto.h>

将Security.framework添加到项目中。

The name parameter specifies the hash function name as a String
Supported functions are MD2, MD4, MD5, SHA1, SHA224, SHA256, SHA384 and SHA512 a This example requires Common Crypto
It is necessary to have a bridging header to the project:
#import <CommonCrypto/CommonCrypto.h>
Add the Security.framework to the project.

此函数采用哈希名称和字符串进行哈希处理并返回a数据：

This function takes a hash name and String to be hashed and returns a Data:

name: A name of a hash function as a String  
string: The String to be hashed  
returns: the hashed result as Data  

func hash(name:String, string:String) -> Data? {
    let data = string.data(using:.utf8)!
    return hash(name:name, data:data)
}

示例：

let clearString = "clearData0123456"
let clearData   = clearString.data(using:.utf8)!
print("clearString: \(clearString)")
print("clearData: \(clearData as NSData)")

let hashSHA256 = hash(name:"SHA256", string:clearString)
print("hashSHA256: \(hashSHA256! as NSData)")

let hashMD5 = hash(name:"MD5", data:clearData)
print("hashMD5: \(hashMD5! as NSData)")

输出：

clearString: clearData0123456
clearData: <636c6561 72446174 61303132 33343536>

hashSHA256: <aabc766b 6b357564 e41f4f91 2d494bcc bfa16924 b574abbd ba9e3e9d a0c8920a>
hashMD5: <4df665f7 b94aea69 695b0e7b baf9e9d6>

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