온라인 SHA256 해시 생성기

I want to find the hash of a MP3 file uploaded on server, using node js crypto library.

I am checking validity of MP3 files using hash, so I need a way to calculate its hash using node js crypto library

I want to use sha256 in my project, but I had some troubles rewriting objC code to swift code. Help me please. I used this answer: How can I compute a SHA-2 (ideally SHA 256 or SHA 512) hash in iOS?

Here's my code

var hash : [CUnsignedChar]CC_SHA256(data.bytes, data.length, hash)var res : NSData = NSData.dataWithBytes(hash, length: CC_SHA256_DIGEST_LENGTH)

it gives me error everything because swift cannot convert Int to CC_LONG, for example.

How to convet hexcode produced from SHA256 back to the SHA256 object ?

digest = SHA256.new()      # digest emptydigest.update(str(data).encode())   # digest has string hashedhex_code = digest.hexcode()

hexcode contains the digest of the data , now is there any way to convert the hexcode back to the SHA256 object ?

Is there any method to use the hexcode to generate the original digest object?

'print(digest) gives <Crypto.Hash.SHA256.SHA256Hash object at 0x7fc2e2ea4da0>print(digest.hexcode()) givesbc273cf180e376f52d8c8a7f6b6ffd5babb872629e5fcc4685fe5284887faee'

Is there any way to use the digest.hexcode() and generate the hash object ?

I am using the jose-jwt library and want to create a signed JWT in C# using the RS256 algorithm for encryption. I have no experience with cryptography, so please excuse my ignorance. I see the following example in the docs:

var payload = new Dictionary<string, object>(){    { "sub", "mr.x@contoso.com" },    { "exp", 1300819380 }};var privateKey=new X509Certificate2("my-key.p12", "password", X509KeyStorageFlags.Exportable | X509KeyStorageFlags.MachineKeySet).PrivateKey as RSACryptoServiceProvider;string token=Jose.JWT.Encode(payload, privateKey, JwsAlgorithm.RS256);

which shows the use of a p12 file, but how do I use an RSA key file of the form below? I am looking at the docs for X509Certificate2, but I see no option for RSA private keys. It appears to only accept PKCS7, which I understand to be public keys.

-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----

Finally, what is the difference between the two options listed in the docs, and how do I choose between the two?

-------------------------- OPTION 1 --------------------------

RS-* and PS-* family

CLR:

RS256, RS384, RS512 and PS256, PS384, PS512 signatures require RSACryptoServiceProvider (usually private) key of corresponding length. CSP need to be forced to use Microsoft Enhanced RSA and AES Cryptographic Provider. Which usually can be done be re-importing RSAParameters. See http://clrsecurity.codeplex.com/discussions/243156 for details.

-------------------------- OPTION 2 --------------------------

CORECLR: RS256, RS384, RS512 signatures require RSA (usually private) key of corresponding length.

I have to convert string to sha256 in dart. For example I use String a = "2424242401224672"; In my code below I get an result as; digest: 7b73641404a8fe6a4b1161a85db736be2a6c07a046109b993186f7a22190bf13

The Code:

  String a = "2424242401224672";  var bytes = utf8.encode(a.hashCode.toString());  var digest = sha256.convert(bytes);  print("digest: $digest");

In other party use c# for sha256. They get bytes from string(object) using c# MemoryStream, BinaryFormatter and XMLSerilizer.

But when I show my result they told me that they get different result in C# sha256?

How to get same result with Dart sha256 and C# sha256?

Update:

The string "2424242401224672" in CSharp has a sha256 value as:DE4841A9E623AF7D5C598A67C2461702485F6B77C3EB5448FA5E0DDF074C70D8

Update-2:

The csharp code:

private static string ComputeHash(byte[] objectAsBytes){                            try    {        SHA256 shaM = new SHA256Managed();        byte[] result = shaM.ComputeHash(objectAsBytes);        return byteArrayToHex(result);    }    catch (ArgumentNullException ane)    {        return null;    }}private static byte[] ObjectToByteArray(Object objectToSerialize){                MemoryStream ms = new MemoryStream();    //BinaryFormatter formatter = new BinaryFormatter();                System.Xml.Serialization.XmlSerializer x = new System.Xml.Serialization.XmlSerializer(objectToSerialize.GetType());    try    {        //Here's the core functionality! One Line!        //To be thread-safe we lock the object        lock (locker)        {            x.Serialize(ms, objectToSerialize);            //formatter.Serialize(fs, objectToSerialize);        }        //return fs.ToArray();                        return ms.ToArray();    }    catch (SerializationException se)    {                        return null;    }    finally    {        //fs.Close();        ms.Close();    }}

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