// signature
public static string CreateSignature(string email, string password, RSAParameters key)
{
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
rsa.ImportParameters(key);
SHA1 sha1 = SHA1.Create();
byte[] prefix = { 0x00 };
byte[] hash = sha1.ComputeHash(GoogleKeyUtils.KeyToStruct(key)).Take(4).ToArray();
byte[] encrypted = rsa.Encrypt(Encoding.UTF8.GetBytes(email + "\x00" + password), true);
return(DataTypeUtils.UrlSafeBase64(DataTypeUtils.CombineBytes(prefix, hash, encrypted)));
}
// signature
public static string CreateSignature(string email, string password, RSAParameters key)
{
var rsa = AsymmetricKeyAlgorithmProvider.OpenAlgorithm(AsymmetricAlgorithmNames.RsaOaepSha1);
var keyBlob = CryptographicBuffer.DecodeFromBase64String(b64KeyBlob);
var publicKey = rsa.ImportPublicKey(keyBlob, CryptographicPublicKeyBlobType.Capi1PublicKey);
byte[] prefix = { 0x00 };
HashAlgorithmProvider hashAlgorithm = HashAlgorithmProvider.OpenAlgorithm(HashAlgorithmNames.Sha1);
var hash = hashAlgorithm.HashData(GoogleKeyUtils.KeyToStruct(key).AsBuffer()).ToArray().Take(4).ToArray();
byte[] encrypted = CryptographicEngine.Encrypt(publicKey, Encoding.UTF8.GetBytes(email + "\x00" + password).AsBuffer(), null).ToArray();
return(DataTypeUtils.UrlSafeBase64(DataTypeUtils.CombineBytes(prefix, hash, encrypted)));
}