xcode 如何从 SWIFT 中的字符串获取 MD5 哈希并制作桥头
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How to get MD5 hash from string in SWIFT and make bridge-header
提问by Mike
i dont even expect this problem, but it appears. I try to get md5 hash from string in swift. I search about that on SO and assume that i need to import library like that:
我什至不希望有这个问题，但它出现了。我尝试快速从字符串中获取 md5 哈希值。我在 SO 上搜索并假设我需要像这样导入库：
#import <CommonCrypto/CommonCrypto.h>
First of all compiler said that '#' is not okay. Then i removed and compiler said that '<' is not okay. I tried to figure out that and find recommendations to add folder named "CommonCrypto" and create a file named "module.map". I cant understand how to create file with this extension. Okay, i create swift file and replace its extension. Then write code there:
首先编译器说'#'不行。然后我删除了，编译器说 '<' 不好。我试图弄清楚并找到添加名为“CommonCrypto”的文件夹并创建一个名为“module.map”的文件的建议。我无法理解如何使用此扩展名创建文件。好的，我创建了 swift 文件并替换了它的扩展名。然后在那里写代码：
module CommonCrypto [system] {
header "/usr/include/CommonCrypto/CommonCrypto.h"
export *
}
and again its not okay Then in recommendations was adding the new module to Import Paths under Swift Compiler – Search Paths in your project settings ${SRCROOT}/CommonCrypto).
再次它不行然后在建议中将新模块添加到 Swift 编译器下的导入路径 - 在您的项目设置 ${SRCROOT}/CommonCrypto 中搜索路径）。
and its again not okay.
它又不好。
i cant belive that its so difficult to do that. i think i misunderstand some steps or something. if you know step by step answer please help))
我无法相信它是如此困难做到这一点。我想我误解了一些步骤或某事。如果你知道一步一步的答案，请帮忙））
回答by zaph
You need to add a bridging header and add the #import <CommonCrypto/CommonCrypto.h>statement to it.
您需要添加一个桥接头并向其添加#import <CommonCrypto/CommonCrypto.h>语句。
The easiest way to add a bridging header is to add an Objective-C file to the project, you will be aked ig you want to add a bridging header, reply yes. After that you can delete the Objective-C file file that was added.
添加桥接头最简单的方法是在项目中添加一个Objective-C文件，你会被问到要添加桥接头，回复yes。之后，您可以删除添加的 Objective-C 文件文件。
Example code:
示例代码：
func md5(#string: String) -> NSData {
var digest = NSMutableData(length: Int(CC_MD5_DIGEST_LENGTH))!
if let data :NSData = string.dataUsingEncoding(NSUTF8StringEncoding) {
CC_MD5(data.bytes, CC_LONG(data.length),
UnsafeMutablePointer<UInt8>(digest.mutableBytes))
}
return digest
}
//Test:
let digest = md5(string:"Here is the test string")
println("digest: \(digest)")
Output:
输出：
digest: 8f833933 03a151ea 33bf6e3e bbc28594
摘要：8f833933 03a151ea 33bf6e3e bbc28594
Here is a more Swift 2.0 version returning an array of UInt8:
这是一个更 Swift 2.0 版本，返回一个数组UInt8：
func md5(string string: String) -> [UInt8] {
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)
}
return digest
}
回答by jjrscott
A solution for Swift 4.1:
Swift 4.1 的解决方案：
import CommonCrypto
extension Data
{
func md5() -> Data
{
var digest = Data(count: Int(CC_MD5_DIGEST_LENGTH))
self.withUnsafeBytes { (bytes : UnsafePointer<UInt8>) -> Void in
digest.withUnsafeMutableBytes { (mutableBytes : UnsafeMutablePointer<UInt8>) -> Void in
CC_MD5(bytes, CC_LONG(self.count), mutableBytes)
}
}
return digest
}
}
See Importing CommonCrypto in a Swift frameworkfor the CommonCryptopart.
见在斯威夫特框架导入CommonCrypto的CommonCrypto一部分。
