Swift2 如何在swift 2&；中使用通用加密和/或计算sha256；3.

我正在尝试根据sha256将哈希设置为密码值。我已经搜索过了，但是没有关于swift 2的信息。这个解决方案对我不起作用

func sha256(data:String) -> String {
        let data = self.dataUsingEncoding(NSUTF8StringEncoding)!
        var digest = [UInt8](count:Int(CC_SHA256_DIGEST_LENGTH), repeatedValue: 0)
        CC_SHA256(data.bytes, CC_LONG(data.length), &digest)
        let hexBytes = digest.map { String(format: "%02hhx", $0) }
        return hexBytes.joinWithSeparator("")
    }

---

它给出错误：使用未解析标识符CC_SHA256_DIGEST_LENGTH添加桥接头并向其添加导入：

#导入

Swift 3：

func sha256(string: String) -> Data? {
    guard let messageData = string.data(using:String.Encoding.utf8) else { return nil }
    var digestData = Data(count: Int(CC_SHA256_DIGEST_LENGTH))

    _ = digestData.withUnsafeMutableBytes {digestBytes in
        messageData.withUnsafeBytes {messageBytes in
            CC_SHA256(messageBytes, CC_LONG(messageData.count), digestBytes)
        }
    }
    return digestData
}

//试验

let shaData = sha256(string:"Here is the test string")
let shaHex =  shaData!.map { String(format: "%02hhx", $0) }.joined()
print("shaHex: \(shaHex)")

shaHex:6F5C446883A3049CAF8368B4BAD2DF045A39D467EE20A8D34D5698E649FE21

Swift 2：

func sha256(string string: String) -> NSData {
    let digest = NSMutableData(length: Int(CC_SHA256_DIGEST_LENGTH))!
    if let data :NSData = string.dataUsingEncoding(NSUTF8StringEncoding) {
        CC_SHA256(data.bytes, CC_LONG(data.length),
            UnsafeMutablePointer<UInt8>(digest.mutableBytes))
    }
    return digest
}

输出：

clearString: clearData0123456
keyString:   keyData8901234562
clearData: <636c6561 72446174 61303132 33343536>
keyData:   <6b657944 61746138 39303132 33343536 32>

hmacData1: <bb358f41 79b68c08 8e93191a da7dabbc 138f2ae6>
hmacData2: <bb358f41 79b68c08 8e93191a da7dabbc 138f2ae6>
hmacData3: <bb358f41 79b68c08 8e93191a da7dabbc 138f2ae6>

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

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

摘要：6f5c4468 83a3049c af8368b4 BAD2DF 045a39d4 67ee20a8 d34d5698 e649fe21

阳光照射文档部分的示例： HMAC配备MD5、SHA1、SH224、SH256、SH384、SH512（Swift 3+）

这些函数将使用八种加密哈希算法之一对字符串或数据输入进行哈希

name参数将哈希函数名称指定为字符串 支持的函数有MD5、SHA1、SH224、SH256、SH384和SH512

此示例需要通用加密
有必要为项目设置桥接标题：

#导入

将Security.framework添加到项目中

这些函数采用散列名称、要散列的消息、键并返回摘要：

---

}

---

---

//例子

let clearString = "clearData0123456"
let keyString   = "keyData8901234562"
let clearData   = clearString.data(using:.utf8)!
let keyData     = keyString.data(using:.utf8)!
print("clearString: \(clearString)")
print("keyString:   \(keyString)")
print("clearData: \(clearData as NSData)")
print("keyData:   \(keyData as NSData)")

let hmacData1 = hmac(hashName:"SHA1", message:clearData, key:keyData)
print("hmacData1: \(hmacData1! as NSData)")

let hmacData2 = hmac(hashName:"SHA1", message:clearString, key:keyString)
print("hmacData2: \(hmacData2! as NSData)")

let hmacData3 = hmac(hashName:"SHA1", message:clearString, key:keyData)
print("hmacData3: \(hmacData3! as NSData)")

输出：

clearString: clearData0123456
keyString:   keyData8901234562
clearData: <636c6561 72446174 61303132 33343536>
keyData:   <6b657944 61746138 39303132 33343536 32>

hmacData1: <bb358f41 79b68c08 8e93191a da7dabbc 138f2ae6>
hmacData2: <bb358f41 79b68c08 8e93191a da7dabbc 138f2ae6>
hmacData3: <bb358f41 79b68c08 8e93191a da7dabbc 138f2ae6>

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

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

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
keyString:   keyData8901234562
clearData: <636c6561 72446174 61303132 33343536>
keyData:   <6b657944 61746138 39303132 33343536 32>

hmacData1: <bb358f41 79b68c08 8e93191a da7dabbc 138f2ae6>
hmacData2: <bb358f41 79b68c08 8e93191a da7dabbc 138f2ae6>
hmacData3: <bb358f41 79b68c08 8e93191a da7dabbc 138f2ae6>

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

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

clearString:clearData0123456
clearData：
hashSHA256：
hashMD5：

它以什么方式不起作用？添加问题的更新，不是作为注释。如果您想对密码进行哈希运算，请使用

PBKDF2

而不是简单的哈希运算。我之所以使用它，是因为在服务器端，如果没有问题，他们使用sha256。如果服务器上的安全性不重要，我可能会使用PBKDF2。我是否应该导入一些内容，因为它在CC_sha256_DIGEST_长度和CC_sha256处出现错误？您有要添加桥接标题并向其添加

#import

。我应该写标题名称吗？我在Swift 3上，但这个答案帮助我找到了解决方案。在Xcode 8中添加桥接头有点困难。与其他基于swift库的方法相比，它既优雅又轻巧。一件事是我信任CommonCrypto，我希望它在处理出口合规性问题时不会有太多问题，至少是为了安全。要添加桥接头，我只需在Swift项目中添加一个新的

Objective-C

文件，如果它是第一个Objc文件，那么它将询问您是否要添加桥接头。是，然后返回删除该Objc文件。

clearString: clearData0123456
keyString:   keyData8901234562
clearData: <636c6561 72446174 61303132 33343536>
keyData:   <6b657944 61746138 39303132 33343536 32>

hmacData1: <bb358f41 79b68c08 8e93191a da7dabbc 138f2ae6>
hmacData2: <bb358f41 79b68c08 8e93191a da7dabbc 138f2ae6>
hmacData3: <bb358f41 79b68c08 8e93191a da7dabbc 138f2ae6>

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)
}

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)")

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

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