在iOS中生成SHA256

Question

我嘗試在iOS中使用Arcane庫生成SHA256，其中包含以下數據：

字符串： Amount=50&BillerID=59&ChannelID=2&Context=34|check|test&ReturnURL=https://uat.myfatoora.com/ReceiptPOC.aspx&TxnRefNum=000000000020003&UserName=DCS

鍵： 71DD0F73AFFBB47825FF9864DDE95F3B

結果是409dc622b3bef5c9fc46e45c3210111fcb4536d3a55833316fe0dc8154b3ea34

我認為是正確的。 但是，Windows對應方使用以下代碼生成SHA256：

Windows Phone Source Code:

public static string HmacSha256(string secretKey, string value)
    {
        var msg = CryptographicBuffer.ConvertStringToBinary(value, BinaryStringEncoding.Utf8);
        byte[] convertedHash = new byte[secretKey.Length / 2];

        for (int i = 0; i < secretKey.Length / 2; i++)
        {
            convertedHash[i] = (byte)Int32.Parse(secretKey.Substring(i * 2, 2), System.Globalization.NumberStyles.HexNumber);
        }

        // Create HMAC.
        var objMacProv = MacAlgorithmProvider.OpenAlgorithm(MacAlgorithmNames.HmacSha256);
        CryptographicHash hash = objMacProv.CreateHash(convertedHash.AsBuffer());

        hash.Append(msg);
        return CryptographicBuffer.EncodeToHexString(hash.GetValueAndReset());

    }

結果是： 94a20ca39c8487c7763823ec9c918d9e38ae83cb741439f6d129bcdef9edba73這與我得到的不同。 有人可以幫助我，讓我知道上面的代碼是做什么的，我怎么能在iOS中復制它。

編輯：

 iOS Source code

 let key = self.md5(string: "71DD0F73AFFBB47825FF9864DDE95F3B")

    let hash = HMAC.SHA256(str, key: key)

Answer 1

這里的關鍵是你需要將你的秘密（十六進制字符串）轉換為NSData。 換句話說， NSData字節流將“看起來”像秘密。

這應該做你想要的：

    // Hex string to NSData conversion from here http://stackoverflow.com/questions/7317860/converting-hex-nsstring-to-nsdata
    NSString *secret = @"71DD0F73AFFBB47825FF9864DDE95F3B";
    NSData *dataIn = [@"Amount=50&BillerID=59&ChannelID=2&Context=34|check|test&ReturnURL=https://uat.myfatoora.com/ReceiptPOC.aspx&TxnRefNum=000000000020003&UserName=DCS" dataUsingEncoding:NSUTF8StringEncoding];
    NSMutableData *macOut = [NSMutableData dataWithLength:CC_SHA256_DIGEST_LENGTH];

    secret = [secret stringByReplacingOccurrencesOfString:@" " withString:@""];
    NSMutableData *secretData = [[NSMutableData alloc] init];
    unsigned char whole_byte;
    char byte_chars[3] = {'\0','\0','\0'};
    int i;
    for (i=0; i < [secret length]/2; i++) {
        byte_chars[0] = [secret characterAtIndex:i*2];
        byte_chars[1] = [secret characterAtIndex:i*2+1];
        whole_byte = strtol(byte_chars, NULL, 16);
        [secretData appendBytes:&whole_byte length:1];
    }

    CCHmac(kCCHmacAlgSHA256, secretData.bytes, secretData.length, dataIn.bytes, dataIn.length, macOut.mutableBytes);

    NSMutableString *stringOut = [NSMutableString stringWithCapacity:macOut.length];
    const unsigned char *macOutBytes = macOut.bytes;

    for (NSInteger i=0; i<macOut.length; ++i) {
        [stringOut appendFormat:@"%02x", macOutBytes[i]];
    }

    NSLog(@"dataIn: %@", dataIn);
    NSLog(@"macOut: %@", macOut);
    NSLog(@"stringOut: %@", stringOut);

輸出：

2016年9月27日20：18：54.181 JKS [27562：5321334] DATAIN：<416d6f75 6e743d35 30264269 6c6c6572 49443d35 39264368 616e6e65 6c49443d 3226436f 6e746578 743d3334 7c636865 636b7c74 65737426 52657475 726e5552 4c3d6874 7470733a 2f2f7561 742e6d79 6661746f 6f72612e 636f6d2f 52656365 69707450 73707826 4f432e61 54786e52 65664e75 6d3d3030 30303030 30303030 32303030 33265573 65724e61 6d653d44 4353>

2016-09-27 20：18：54.181 JKS [27562：5321334] macOut：<94a20ca3 9c8487c7 763823ec 9c918d9e 38ae83cb 741439f6 d129bcde f9edba73>

2016-09-27 20：18：54.181 JKS [27562：5321334] stringOut：94a20ca39c8487c7763823ec9c918d9e38ae83cb741439f6d129bcdef9edba73

使用Swift更新（代碼應該清理）

// http://stackoverflow.com/questions/29799361/generate-a-hmac-swift-sdk8-3-using-cchmac
func generateHMAC(key: String, data: String) -> String {
    let keyData = key.dataFromHexadecimalString()! as NSData
    let dataIn = data.data(using: .utf8)! as NSData
    var result: [CUnsignedChar]
    result = Array(repeating: 0, count: Int(CC_SHA256_DIGEST_LENGTH))
    CCHmac(CCHmacAlgorithm(kCCHmacAlgSHA256), keyData.bytes, keyData.length, dataIn.bytes, dataIn.length, &result)

    let hash = NSMutableString()
    for val in result {
        hash.appendFormat("%02hhx", val)
    }

    return hash as String
}

您可以使用此擴展名將十六進制字符串轉換為Data

// Modified slightly http://stackoverflow.com/questions/26501276/converting-hex-string-to-nsdata-in-swift
extension String {

    func dataFromHexadecimalString() -> Data? {
        var data = Data(capacity: characters.count / 2)

        let regex = try! NSRegularExpression(pattern: "[0-9a-f]{1,2}", options: .caseInsensitive)
        regex.enumerateMatches(in: self, options: [], range: NSMakeRange(0, characters.count)) { match, flags, stop in
            let byteString = (self as NSString).substring(with: match!.range)
            var num = UInt8(byteString, radix: 16)
            data.append(&num!, count: 1)
        }

        return data
    }
}

並使用類似的東西：

    let secret = "71DD0F73AFFBB47825FF9864DDE95F3B"
    let value = "Amount=50&BillerID=59&ChannelID=2&Context=34|check|test&ReturnURL=https://uat.myfatoora.com/ReceiptPOC.aspx&TxnRefNum=000000000020003&UserName=DCS"

    print("\(generateHMAC(key: secret, data: value))")

你的輸出應該是94a20ca39c8487c7763823ec9c918d9e38ae83cb741439f6d129bcdef9edba73

在橋接頭中需要#import <CommonCrypto/CommonCrypto.h> 。

Answer 2

Windows代碼接受字符串，將其解釋為十六進制數，並將一次轉換為兩個字符到一個字節。

您的Mac代碼最喜歡采用的字符串，因為它是 。 由於密鑰以“71”開頭，因此您的Windows代碼將其作為單個字節，值為0x71 = 129，您的Mac代碼將其視為兩個字節，值為“7”= 55且“1”= 49。

您需要做的就是完全像在Windows上一樣轉換Mac上的字節。 你可能不得不做不可想象的事情並查看Mac庫的源代碼，看看它是如何進行實際的哈希計算的。

Answer 3

 #import <CommonCrypto/CommonHMAC.h> + (NSString *)hmacSHA256EncryptString{ NSString * parameterSecret = @"input secret key"; NSString *plainString = @"input encrypt content string"; const char *secretKey = [parameterSecret cStringUsingEncoding:NSUTF8StringEncoding]; const char *plainData = [plainString cStringUsingEncoding:NSUTF8StringEncoding]; unsigned char cHMAC[CC_SHA256_DIGEST_LENGTH]; CCHmac(kCCHmacAlgSHA256, secretKey, strlen(secretKey), plainData, strlen(plainData), cHMAC); NSData *HMACData = [NSData dataWithBytes:cHMAC length:sizeof(cHMAC)]; const unsigned char *bufferChar = (const unsigned char *)[HMACData bytes]; NSMutableString *hmacString = [NSMutableString stringWithCapacity:HMACData.length * 2]; for (int i = 0; i < HMACData.length; ++i){ [hmacString appendFormat:@"%02x", bufferChar[i]]; } return hmacString; }