swift2 - 如何在 swift 2 & 3 中使用常见的加密和/或计算 sha256

Question

我正在尝试根据 sha256 使哈希成为密码值。我已经搜索过这个，但没有关于 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("")
    }

它给出了错误:使用未解析的标识符 CC_SHA256_DIGEST_LENGTH

Answer 1

添加桥接头并向其添加导入:#import <CommonCrypto/CommonDigest.h>
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
}

//测试

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

shaHex: 6f5c446883a3049caf8368b4bad2d2ff045a39d467ee20a8d34d5698e649fe21

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
}

//测试:

let digest = sha256(string:"Here is the test string")
print("digest: \(digest)")

输出:

digest: 6f5c4468 83a3049c af8368b4 bad2d2ff 045a39d4 67ee20a8 d34d5698 e649fe21

来自日落文档部分的示例:

带有 MD5、SHA1、SHA224、SHA256、SHA384、SHA512(Swift 3+)的 HMAC

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 String
支持的函数有 MD5、SHA1、SHA224、SHA256、SHA384 和 SHA512

此示例需要 Common Crypto
必须有一个到项目的桥接头: #import <CommonCrypto/CommonCrypto.h>将 Security.framework 添加到项目中。

这些函数需要一个散列名称、要散列的消息、一个键并返回一个摘要:

hashName: name of a hash function as String  message:  message as Data  key:      key as Data  returns:  digest as Data  

func hmac(hashName:String, message:Data, key:Data) -> Data? {
    let algos = ["SHA1":   (kCCHmacAlgSHA1,   CC_SHA1_DIGEST_LENGTH),
                 "MD5":    (kCCHmacAlgMD5,    CC_MD5_DIGEST_LENGTH),
                 "SHA224": (kCCHmacAlgSHA224, CC_SHA224_DIGEST_LENGTH),
                 "SHA256": (kCCHmacAlgSHA256, CC_SHA256_DIGEST_LENGTH),
                 "SHA384": (kCCHmacAlgSHA384, CC_SHA384_DIGEST_LENGTH),
                 "SHA512": (kCCHmacAlgSHA512, CC_SHA512_DIGEST_LENGTH)]
    guard let (hashAlgorithm, length) = algos[hashName]  else { return nil }
    var macData = Data(count: Int(length))

    macData.withUnsafeMutableBytes {macBytes in
        message.withUnsafeBytes {messageBytes in
            key.withUnsafeBytes {keyBytes in
                CCHmac(CCHmacAlgorithm(hashAlgorithm),
                       keyBytes,     key.count,
                       messageBytes, message.count,
                       macBytes)
            }
        }
    }
    return macData

}

hashName: name of a hash function as Stringmessage:  message as Stringkey:      key as Stringreturns:  digest as Data

func hmac(hashName:String, message:String, key:String) -> Data? {
    let messageData = message.data(using:.utf8)!
    let keyData = key.data(using:.utf8)!
    return hmac(hashName:hashName, message:messageData, key:keyData)
}

hashName: name of a hash function as String  message:  message as String  key:      key as Data  returns:  digest as Data  

func hmac(hashName:String, message:String, key:Data) -> Data? {
    let messageData = message.data(using:.utf8)!
    return hmac(hashName:hashName, message:messageData, key:key)
}

//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>

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

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 String
支持的函数有 MD2、MD4、MD5、SHA1、SHA224、SHA256、SHA384 和 SHA512
一种
此示例需要 Common Crypto
必须有一个到项目的桥接头: #import <CommonCrypto/CommonCrypto.h>将 Security.framework 添加到项目中。



这个函数需要一个散列名称和要散列的字符串并返回一个数据:

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)
}

例子:

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>