private const AsymmetricAlgorithm RsaType = AsymmetricAlgorithm.RsaPkcs1; //or OeapSha1 and OaepSha256
public void GenerateKeys()
{
ICryptographicKey key = GetAsymmetricKeyAlgorithm().CreateKeyPair(RsaKeySize);
PrivateKey = key.Export(CryptographicPrivateKeyBlobType.Pkcs1RsaPrivateKey);
PublicKey = key.ExportPublicKey(CryptographicPublicKeyBlobType.Pkcs1RsaPublicKey);
}
public void CreateSymmetricKey_ExportPublicKey()
{
var provider = WinRTCrypto.SymmetricKeyAlgorithmProvider.OpenAlgorithm(SymmetricAlgorithm.AesCbcPkcs7);
ICryptographicKey key = provider.CreateSymmetricKey(this.keyMaterial);
Assert.Throws <NotSupportedException>(
() => key.ExportPublicKey());
}
public void CreateKey_NotExportable()
{
var algorithm = WinRTCrypto.MacAlgorithmProvider.OpenAlgorithm(MacAlgorithm.HmacSha1);
ICryptographicKey key = algorithm.CreateKey(this.keyMaterial);
ExceptionAssert.Throws <NotSupportedException>(
() => key.Export());
ExceptionAssert.Throws <NotSupportedException>(
() => key.ExportPublicKey());
}
/// <summary>
/// Exports the RSA parameters of a cryptographic key.
/// </summary>
/// <param name="key">The cryptographic key.</param>
/// <param name="includePrivateParameters"><c>true</c> to include the private key in the exported parameters; <c>false</c> to only include the public key.</param>
/// <returns>The RSA parameters for the key.</returns>
public static RSAParameters ExportParameters(this ICryptographicKey key, bool includePrivateParameters)
{
Requires.NotNull(key, nameof(key));
byte[] keyBlob = includePrivateParameters
? key.Export(CryptographicPrivateKeyBlobType.Pkcs1RsaPrivateKey)
: key.ExportPublicKey(CryptographicPublicKeyBlobType.Pkcs1RsaPublicKey);
RSAParameters parameters = KeyFormatter.Pkcs1.Read(keyBlob);
return(parameters);
}
/// <summary>Exports the RSA parameters of a cryptographic key.</summary>
/// <param name="key">The cryptographic key.</param>
/// <param name="includePrivateParameters"><c>true</c> to include the private key in the exported parameters; <c>false</c> to only include the public key.</param>
/// <returns>The RSA parameters for the key.</returns>
public static RSAParameters ExportParameters(this ICryptographicKey key, bool includePrivateParameters)
{
#if PCL
throw new NotImplementedException("Not implemented in reference assembly.");
#else
Requires.NotNull(key, "key");
byte[] keyBlob = includePrivateParameters
? key.Export(CryptographicPrivateKeyBlobType.Pkcs1RsaPrivateKey)
: key.ExportPublicKey(CryptographicPublicKeyBlobType.Pkcs1RsaPublicKey);
RSAParameters parameters = KeyFormatter.Pkcs1.Read(keyBlob);
return(parameters);
#endif
}
public void RSAParametersPublicKeyRoundtrip()
{
var rsa = WinRTCrypto.AsymmetricKeyAlgorithmProvider.OpenAlgorithm(AsymmetricAlgorithm.RsaOaepSha1);
var keyPair = rsa.CreateKeyPair(512);
RSAParameters parameters = keyPair.ExportParameters(includePrivateParameters: false);
Assert.Null(parameters.P);
Assert.Null(parameters.InverseQ);
Assert.Null(parameters.D);
Assert.Null(parameters.Q);
Assert.Null(parameters.DP);
Assert.Null(parameters.DQ);
ICryptographicKey publicKey = rsa.ImportParameters(parameters);
var blob1 = keyPair.ExportPublicKey();
var blob2 = publicKey.ExportPublicKey();
CollectionAssertEx.AreEqual(blob1, blob2);
}
/// <summary>
/// Initializes a new instance of the <see cref="OwnEndpoint" /> class.
/// </summary>
/// <param name="signingKey">The signing key.</param>
/// <param name="encryptionKey">The encryption key.</param>
/// <param name="inboxOwnerCode">The secret that proves ownership of the inbox at the <see cref="Endpoint.MessageReceivingEndpoint" />.</param>
public OwnEndpoint(ICryptographicKey signingKey, ICryptographicKey encryptionKey, string inboxOwnerCode = null)
: this()
{
Requires.NotNull(signingKey, "signingKey");
Requires.NotNull(encryptionKey, "encryptionKey");
this.PublicEndpoint = new Endpoint
{
SigningKeyPublicMaterial = signingKey.ExportPublicKey(CryptoSettings.PublicKeyFormat),
EncryptionKeyPublicMaterial = encryptionKey.ExportPublicKey(CryptoSettings.PublicKeyFormat),
};
// We could preserve the key instances, but that could make
// our behavior a little less repeatable if we had problems
// with key serialization.
////this.signingKey = signingKey;
////this.encryptionKey = encryptionKey;
// Since this is a new endpoint we can choose a more modern format for the private keys.
this.PrivateKeyFormat = CryptographicPrivateKeyBlobType.Pkcs8RawPrivateKeyInfo;
this.SigningKeyPrivateMaterial = signingKey.Export(this.PrivateKeyFormat);
this.EncryptionKeyPrivateMaterial = encryptionKey.Export(this.PrivateKeyFormat);
this.InboxOwnerCode = inboxOwnerCode;
}
/// <summary>
/// Initializes a new instance of the <see cref="OwnEndpoint" /> class.
/// </summary>
/// <param name="signingKey">The signing key.</param>
/// <param name="encryptionKey">The encryption key.</param>
/// <param name="inboxOwnerCode">The secret that proves ownership of the inbox at the <see cref="Endpoint.MessageReceivingEndpoint" />.</param>
public OwnEndpoint(ICryptographicKey signingKey, ICryptographicKey encryptionKey, string inboxOwnerCode = null)
: this()
{
Requires.NotNull(signingKey, "signingKey");
Requires.NotNull(encryptionKey, "encryptionKey");
this.PublicEndpoint = new Endpoint
{
SigningKeyPublicMaterial = signingKey.ExportPublicKey(CryptoSettings.PublicKeyFormat),
EncryptionKeyPublicMaterial = encryptionKey.ExportPublicKey(CryptoSettings.PublicKeyFormat),
};
// We could preserve the key instances, but that could make
// our behavior a little less repeatable if we had problems
// with key serialization.
////this.signingKey = signingKey;
////this.encryptionKey = encryptionKey;
// Since this is a new endpoint we can choose a more modern format for the private keys.
this.PrivateKeyFormat = CryptographicPrivateKeyBlobType.Pkcs8RawPrivateKeyInfo;
this.SigningKeyPrivateMaterial = signingKey.Export(this.PrivateKeyFormat);
this.EncryptionKeyPrivateMaterial = encryptionKey.Export(this.PrivateKeyFormat);
this.InboxOwnerCode = inboxOwnerCode;
}
public App()
{
// create the key we are going to use
var asym = AsymmetricKeyAlgorithmProvider.OpenAlgorithm(AsymmetricAlgorithm.RsaPkcs1);
var hash = HashAlgorithmProvider.OpenAlgorithm(HashAlgorithm.Sha1);
// The root page of your application
MainPage = new ContentPage
{
Content = new StackLayout
{
VerticalOptions = LayoutOptions.Center,
Children = {
// create a key
(createKeyButton = new Button {
Text = "Create Key",
Command = new Command(() => {
key = asym.CreateKeyPair(512);
var publicKey = key.ExportPublicKey();
var publicKeyString = Convert.ToBase64String(publicKey);
publicKeyLabel.Text = publicKeyString;
})
}),
(publicKeyLabel = new Label {
Text = "..."
}),
// enter plain text
(valueText = new Entry {
Text = "Hello World!"
}),
// start encryption
(encryptButton = new Button {
Text = "Encrypt",
Command = new Command(() => {
try {
var plainString = valueText.Text;
var plain = Encoding.UTF8.GetBytes(plainString);
var encrypted = CryptographicEngine.Encrypt(key, plain);
var encryptedString = Convert.ToBase64String(encrypted);
encryptLabel.Text = encryptedString;
} catch (Exception ex) {
encryptLabel.Text = "Error encrypting: " + ex.Message;
}
})
}),
(encryptLabel = new Label {
Text = "..."
}),
// and now decrypt
(decryptButton = new Button {
Text = "Decrypt",
Command = new Command(() => {
try {
var encryptedString = encryptLabel.Text;
var encrypted = Convert.FromBase64String(encryptedString);
var decrypted = CryptographicEngine.Decrypt(key, encrypted);
var decryptedString = Encoding.UTF8.GetString(decrypted, 0, decrypted.Length);
decryptLabel.Text = decryptedString;
} catch (Exception ex) {
decryptLabel.Text = "Error decrypting: " + ex.Message;
}
})
}),
(decryptLabel = new Label {
Text = "..."
}),
// and hash
(hashButton = new Button {
Text = "hash",
Command = new Command(() => {
try {
var plainString = valueText.Text;
var plain = Encoding.UTF8.GetBytes(plainString);
var hashed = hash.HashData(plain);
var hashedString = Convert.ToBase64String(hashed);
hashLabel.Text = hashedString;
} catch (Exception ex) {
hashLabel.Text = "Error hashing: " + ex.Message;
}
})
}),
(hashLabel = new Label {
Text = "..."
})
}
}
};
// set initial data
createKeyButton.Command.Execute(null);
encryptButton.Command.Execute(null);
decryptButton.Command.Execute(null);
hashButton.Command.Execute(null);
}
public App()
{
// create the key we are going to use
var asym = AsymmetricKeyAlgorithmProvider.OpenAlgorithm(AsymmetricAlgorithm.RsaPkcs1);
var hash = HashAlgorithmProvider.OpenAlgorithm(HashAlgorithm.Sha1);
// The root page of your application
MainPage = new ContentPage
{
Content = new StackLayout
{
VerticalOptions = LayoutOptions.Center,
Children =
{
// create a key
(createKeyButton = new Button {
Text = "Create Key",
Command = new Command(() => {
key = asym.CreateKeyPair(512);
var publicKey = key.ExportPublicKey();
var publicKeyString = Convert.ToBase64String(publicKey);
publicKeyLabel.Text = publicKeyString;
})
}),
(publicKeyLabel = new Label {
Text = "..."
}),
// enter plain text
(valueText = new Entry {
Text = "Hello World!"
}),
// start encryption
(encryptButton = new Button {
Text = "Encrypt",
Command = new Command(() => {
try {
var plainString = valueText.Text;
var plain = Encoding.UTF8.GetBytes(plainString);
var encrypted = CryptographicEngine.Encrypt(key, plain);
var encryptedString = Convert.ToBase64String(encrypted);
encryptLabel.Text = encryptedString;
} catch (Exception ex) {
encryptLabel.Text = "Error encrypting: " + ex.Message;
}
})
}),
(encryptLabel = new Label {
Text = "..."
}),
// and now decrypt
(decryptButton = new Button {
Text = "Decrypt",
Command = new Command(() => {
try {
var encryptedString = encryptLabel.Text;
var encrypted = Convert.FromBase64String(encryptedString);
var decrypted = CryptographicEngine.Decrypt(key, encrypted);
var decryptedString = Encoding.UTF8.GetString(decrypted, 0, decrypted.Length);
decryptLabel.Text = decryptedString;
} catch (Exception ex) {
decryptLabel.Text = "Error decrypting: " + ex.Message;
}
})
}),
(decryptLabel = new Label {
Text = "..."
}),
// and hash
(hashButton = new Button {
Text = "hash",
Command = new Command(() => {
try {
var plainString = valueText.Text;
var plain = Encoding.UTF8.GetBytes(plainString);
var hashed = hash.HashData(plain);
var hashedString = Convert.ToBase64String(hashed);
hashLabel.Text = hashedString;
} catch (Exception ex) {
hashLabel.Text = "Error hashing: " + ex.Message;
}
})
}),
(hashLabel = new Label {
Text = "..."
})
}
}
};
// set initial data
createKeyButton.Command.Execute(null);
encryptButton.Command.Execute(null);
decryptButton.Command.Execute(null);
hashButton.Command.Execute(null);
}