如何使用Swift在iOS中将String转换为MD5哈希？

如何使用Swift在iOS中将String转换为MD5哈希？

分两个步骤：
1.从字符串创建md5数据
2.将md5数据隐蔽为十六进制字符串

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

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", Swift 5.0：) }.joined()print("md5Hex: (md5Hex)")let md5base64 = md5Data.base64EnpredString()print("md5base64: (md5base64)")

输出：

md5Hex：8b1a9953c4611296a827abf8c47804d7
md5base64：ixqZU8RhEpaoJ6v4xHgE1w ==

import Foundationimport var CommonCrypto.CC_MD5_DIGEST_LENGTHimport func CommonCrypto.CC_MD5import typealias CommonCrypto.CC_LonGfunc MD5(string: String) -> Data {        let length = Int(CC_MD5_DIGEST_LENGTH)        let messageData = string.data(using:.utf8)!        var digestData = Data(count: length)        _ = digestData.withUnsafeMutableBytes { digestBytes -> UInt8 in messageData.withUnsafeBytes { messageBytes -> UInt8 in     if let messageBytesbaseAddress = messageBytes.baseAddress, let digestBytesBlindMemory = digestBytes.bindMemory(to: UInt8.self).baseAddress {         let messageLength = CC_LONG(messageData.count)         CC_MD5(messageBytesbaseAddress, messageLength, digestBytesBlindMemory)     }     return 0 }        }        return digestData    }//Test:let md5Data = MD5(string:"Hello")let md5Hex =  md5Data.map { String(format: "%02hhx", 
#import <CommonCrypto/CommonCrypto.h>
) }.joined()print("md5Hex: (md5Hex)")let md5base64 = md5Data.base64EnpredString()print("md5base64: (md5base64)")

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

输出：

md5Hex：8b1a9953c4611296a827abf8c47804d7
md5base64：ixqZU8RhEpaoJ6v4xHgE1w ==

注意：

#import <CommonCrypto/CommonCrypto.h>

必须添加到Bridging-Header文件中

有关如何创建Bridging-Header的信息

通常，不应将MD​​5用于新工作，SHA256是当前的最佳实践。

不推荐使用的文档部分中的示例：

name：作为字符串的哈希函数的名称  string：要散列的字符串  返回：哈希结果为Datafunc hash(name:String, string:String) -> Data? {    let data = string.data(using:.utf8)!    return hash(name:name, data:data)}

这些函数将使用八种密码哈希算法之一来哈希String或Data输入。

name参数将哈希函数名称指定为String
支持的函数是MD2，MD4，MD5，SHA1，SHA224，SHA256，SHA384和SHA512 a此示例需要通用加密
必须在项目中具有桥接头：

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)")

添加安全性.framework到项目。

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此函数采用哈希名称和要哈希的String并返回一个Data：

clearString: clearData0123456cleardata: <636c6561 72446174 61303132 33343536>hashSHA256: <aabc766b 6b357564 e41f4f91 2d494bcc bfa16924 b574abbd ba9e3e9d a0c8920a>hashMD5: <4df665f7 b94aea69 695b0e7b baf9e9d6>

例子：

输出：