SHA512 encryption - XAMARIN

Question

Good afternoon, I’m trying to encrypt a string with SHA512, in the [PCL] project, I’m not getting, can anyone show an example of how to do?

The idea was to do something like:

public string Encripty(DateTime dataAtual, string stringQueQueroEncriptar){

return data = SHA512.secretKey("dataAtual").Hash("stringQueQueroEncriptar");

}

Answer 1

According to this post, the namespace System.Security.Cryptography is not compatible with PCL, but Mono yes.

Try something like:

protected override byte[] ComputeHash(byte[] data)
    {
        var input = CryptographicBuffer.CreateFromByteArray(data);

        var hasher = HashAlgorithmProvider.OpenAlgorithm(HashAlgorithmNames.Sha512);
        var hashedBuf = hasher.HashData(input);

        byte[] result = new byte[hashedBuf.Length];
        CryptographicBuffer.CopyToByteArray(hashedBuf, out result);
        return result;
    }

Answer 2

I found/ - Installing from Nuguet Pclcrypto(when installing, Assembly Validation has to be appearing tbm in the reference list, or install manually by entering the Pclcrypto folder). just send that code there and success!

public string CreateHash(string date, string userId) {



            IMacAlgorithmProvider mac = WinRTCrypto.MacAlgorithmProvider.OpenAlgorithm(MacAlgorithm.HmacSha512);

            byte[] keyMaterial = WinRTCrypto.CryptographicBuffer.ConvertStringToBinary(date, crypto.Encode());

            ICryptographicKey cryptoKey = mac.CreateKey(keyMaterial);

            byte[] hash = WinRTCrypto.CryptographicEngine.Sign(cryptoKey, WinRTCrypto.CryptographicBuffer.ConvertStringToBinary(userId, Encoding.UTF8));

            StringBuilder hashHMAC = new StringBuilder();
            for (int i = 0; i < hash.Length; i++) {
                hashHMAC.Append(hash[i].ToString("X2"));
            }

            return hashHMAC.ToString();
        }