private string Sign(string requestString, string key)
{
// computing SHA256 signature using a managed code library
var hmac = SHA.computeHMAC_SHA256(Convert.FromBase64String(key), Encoding.UTF8.GetBytes(requestString));
return(Convert.ToBase64String(hmac));
}
static string Sign(string requestString, string key)
{
// computing SHA256 signature using a managed code library
var hmac = SHA.computeHMAC_SHA256(Convert.FromBase64String(key), Encoding.UTF8.GetBytes(requestString));
return(Convert.ToBase64String(hmac));
// computing SHA256 signature using the .NET Micro Framework classes
// this requires that the appropriate assemblies are compiled and available in the .NETMF build it's being used
// required assemblies are: Microsoft.SPOT.Cryptoki and System.Security.Cryptography
//using (Microsoft.SPOT.Cryptoki.Session openSession = new Microsoft.SPOT.Cryptoki.Session("", Microsoft.SPOT.Cryptoki.MechanismType.SHA256_HMAC))
//{
// Microsoft.SPOT.Cryptoki.CryptokiAttribute[] secretKey = new Microsoft.SPOT.Cryptoki.CryptokiAttribute[]
// {
// new Microsoft.SPOT.Cryptoki.CryptokiAttribute(Microsoft.SPOT.Cryptoki.CryptokiAttribute.CryptokiType.Class, Microsoft.SPOT.Cryptoki.Utility.ConvertToBytes((int)Microsoft.SPOT.Cryptoki.CryptokiClass.SECRET_KEY)),
// new Microsoft.SPOT.Cryptoki.CryptokiAttribute(Microsoft.SPOT.Cryptoki.CryptokiAttribute.CryptokiType.KeyType, Microsoft.SPOT.Cryptoki.Utility.ConvertToBytes((int)System.Security.Cryptography.CryptoKey.KeyType.GENERIC_SECRET)),
// new Microsoft.SPOT.Cryptoki.CryptokiAttribute(Microsoft.SPOT.Cryptoki.CryptokiAttribute.CryptokiType.Value, Convert.FromBase64String(key))
// };
// System.Security.Cryptography.CryptoKey binKey = System.Security.Cryptography.CryptoKey.LoadKey(openSession, secretKey);
// using (System.Security.Cryptography.KeyedHashAlgorithm hmacOpenSSL = new System.Security.Cryptography.KeyedHashAlgorithm(System.Security.Cryptography.KeyedHashAlgorithmType.HMACSHA256, binKey))
// {
// byte[] hmac1 = hmacOpenSSL.ComputeHash(Encoding.UTF8.GetBytes(requestString));
// return Convert.ToBase64String(hmac1);
// }
//}
}