NSData Sha512 Hashing with Xamarin - xamarin

Question

I have an example of SHA512 hash of two NSData objects (Objective-C)
Objective C SHA512 hash of two NSData
that's in objective C, using the CommonCrypto, however I have tried to do the same thing using the SHA512Managed Class but could not get the same results.
PS: I am looking to be able to hash 2 NSData objects not a string.
Is there any way to do it using C#?
What would be the equivalent of CC_SHA512_Update and CC_SHA512_Final for Xamarin.iOS?

Answer 1

You could create the NSData with the string .
SHA512 shaM = new SHA512Managed();
byte[] data = shaM.ComputeHash(Encoding.UTF8.GetBytes(""));
StringBuilder sBuilder = new StringBuilder();
for (int i = 0; i < data.Length; i++)
{
sBuilder.Append(data[i].ToString("x2"));
}
string stringyHash = sBuilder.ToString();
NSData dataStr = NSData.FromString(stringyHash,NSStringEncoding.UTF8);

Answer 2

I think, I've found the answer:
To reproduce the same output as the native code mentioned in my question
I would use the following method:
public NSData SHA512HashWithSalt(NSData contentData, NSData saltData)
{
HashAlgorithm algorithm = new SHA256Managed();
//Convert NSData to array of bytes
byte[] salt = saltData.ToArray();
byte[] content = contentData.ToArray();
byte[] plainTextWithSaltBytes =
new byte[content.Length + salt.Length];
for (int i = 0; i < content.Length; i++)
{
plainTextWithSaltBytes[i] = content[i];
}
for (int i = 0; i < salt.Length; i++)
{
plainTextWithSaltBytes[content.Length + i] = salt[i];
}
return NSData.FromArray(algorithm.ComputeHash(plainTextWithSaltBytes));
}