如何在swift 2和3中使用常见的加密和/或计算sha256

Question

我试图根据sha256使哈希成为密码值.我已经搜索了这个,但没有关于swift 2的信息.这个解决方案对我没用

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:使用未解析的标识符CC_SHA256_DIGEST_LENGTH

Answer 1

添加桥接标头并将导入添加到其中:
#import <CommonCrypto/CommonDigest.h>

斯威夫特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

斯威夫特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:

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

日落文档部分的示例:

HMAC与MD5,SHA1,SHA224,SHA256,SHA384,SHA512(Swift 3+)

这些函数将使用八种加密哈希算法之一对String或Data输入进行散列.

name参数指定哈希函数名称为字符串支持的函数是MD5,SHA1,SHA224,SHA256,SHA384和SHA512

此示例需要Common Crypto
.必须为项目提供桥接头:
#import <CommonCrypto/CommonCrypto.h>
将Security.framework添加到项目中.

这些函数采用哈希名称,要散列的消息,密钥并返回摘要:

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 String
message:  message as String
key:      key as String
returns:  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+)

这些函数将使用八种加密哈希算法之一对String或Data输入进行散列.

name参数指定散列函数名称为字符串
支持的函数是MD2,MD4,MD5,SHA1,SHA224,SHA256,SHA384和SHA512 a此示例需要Common Crypto
必须为项目设置桥接头:
#import <CommonCrypto/CommonCrypto.h>
添加安全性.框架到项目.

此函数将哈希名称和字符串进行哈希处理并返回一个数据:

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>