/// <summary>
/// The decrypt.
/// </summary>
/// <param name="encrypted">
/// The encrypted.
/// </param>
/// <param name="pk">
/// The pk.
/// </param>
/// <returns>
/// The <see cref="string"/>.
/// </returns>
private string Decrypt(string encrypted, PrivateKey pk)
{
var keyParam = pk.GetPrivateKeyParam();
var engine = new Pkcs1Encoding(new RsaEngine());
engine.Init(false, keyParam);
var blockSize = engine.GetInputBlockSize();
byte[] bytes = Convert.FromBase64String(encrypted);
byte[] dec = engine.ProcessBlock(bytes, 0, blockSize);
var clear = this.ToUTF8String(dec);
return clear;
}
internal string Decrypt(string cryptText, string encryptionKey, bool isPrivate)
{
RsaKeyParameters key;
byte[] data = null;
List<byte> output = new List<byte>();
string result = null;
try
{
if (isPrivate)
key = RsaPrivateStringToRsaKey(encryptionKey);
else
key = RsaPublicStringToRsaKey(encryptionKey);
data = Hex.Decode(cryptText);
IAsymmetricBlockCipher e = new Pkcs1Encoding(new RsaEngine()).GetUnderlyingCipher();
e.Init(false, key);
int blockSize = e.GetInputBlockSize();
if (data != null)
{
for (int chunkPosition = 0; chunkPosition < data.Length; chunkPosition += blockSize)
{
int chunkSize;
if (data.Length <= blockSize)
chunkSize = data.Length;
else if ((chunkPosition + blockSize) > data.Length)
chunkSize = data.Length - chunkPosition;
else
chunkSize = blockSize;
if (chunkSize <= 0)
break;
output.AddRange(e.ProcessBlock(data, chunkPosition, chunkSize));
}
result = ByteArrayToString(output.ToArray());
}
}
catch (Exception ex)
{
Debug.Write(ex.ToString());
}
return result;
}
internal string Encrypt(string plainText, string encryptionKey, bool isPrivate)
{
RsaKeyParameters key;
byte[] data = null;
List<byte> output = new List<byte>();
string result = null;
try
{
if (isPrivate)
key = RsaPrivateStringToRsaKey(encryptionKey);
else
key = RsaPublicStringToRsaKey(encryptionKey);
data = StringToByteArray(plainText);
IAsymmetricBlockCipher e = new Pkcs1Encoding(new RsaEngine()).GetUnderlyingCipher();
e.Init(true, key);
int blockSize = e.GetInputBlockSize();
if (data != null)
{
for (int chunkPosition = 0; chunkPosition < data.Length; chunkPosition += blockSize)
{
int chunkSize;
if (data.Length <= blockSize)
chunkSize = data.Length; // If we have less data then the blockSize, do it all
else if ((chunkPosition + blockSize) > data.Length) // Do we have any remainder data
chunkSize = data.Length - chunkPosition;
else
chunkSize = blockSize; // Normal process, chunk to blockSize
// No more blocks to process
if (chunkSize <= 0)
break;
output.AddRange(e.ProcessBlock(data, chunkPosition, chunkSize));
}
result = Encoding.ASCII.GetString(Hex.Encode(output.ToArray()));
}
}
catch (Exception)
{
}
return result;
}
//PrivateKey priv, PublicKey pub)
// TODO Move this when other JCE tests are ported from Java
/**
* signature with a "forged signature" (sig block not at end of plain text)
*/
private void doTestBadSig()
{
// Signature sig = Signature.getInstance("SHA1WithRSAEncryption", "BC");
ISigner sig = SignerUtilities.GetSigner("SHA1WithRSAEncryption");
// KeyPairGenerator fact;
// KeyPair keyPair;
// byte[] data = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 };
// fact = KeyPairGenerator.getInstance("RSA", "BC");
RsaKeyPairGenerator fact = new RsaKeyPairGenerator();
// fact.initialize(768, new SecureRandom());
RsaKeyGenerationParameters factParams = new RsaKeyGenerationParameters(
// BigInteger.ValueOf(0x11), new SecureRandom(), 768, 25);
BigInteger.ValueOf(3), new SecureRandom(), 768, 25);
fact.Init(factParams);
// keyPair = fact.generateKeyPair();
//
// PrivateKey signingKey = keyPair.getPrivate();
// PublicKey verifyKey = keyPair.getPublic();
IAsymmetricCipherKeyPair keyPair = fact.GenerateKeyPair();
IAsymmetricKeyParameter priv = keyPair.Private;
IAsymmetricKeyParameter pub = keyPair.Public;
// testBadSig(signingKey, verifyKey);
// MessageDigest sha1 = MessageDigest.getInstance("SHA1", "BC");
IDigest sha1 = DigestUtilities.GetDigest("SHA1");
// Cipher signer = Cipher.getInstance("RSA/ECB/PKCS1Padding", "BC");
// IBufferedCipher signer = CipherUtilities.GetCipher("RSA/ECB/PKCS1Padding");
IAsymmetricBlockCipher signer = new Pkcs1Encoding(new RsaEngine());
// signer.init(Cipher.ENCRYPT_MODE, priv);
signer.Init(true, priv);
// byte[] block = new byte[signer.getBlockSize()];
// byte[] block = new byte[signer.GetBlockSize()];
byte[] block = new byte[signer.GetInputBlockSize()];
// sha1.update((byte)0);
sha1.Update(0);
// byte[] sigHeader = Hex.decode("3021300906052b0e03021a05000414");
byte[] sigHeader = Hex.Decode("3021300906052b0e03021a05000414");
// System.arraycopy(sigHeader, 0, block, 0, sigHeader.length);
Array.Copy(sigHeader, 0, block, 0, sigHeader.Length);
// sha1.digest(block, sigHeader.length, sha1.getDigestLength());
sha1.DoFinal(block, sigHeader.Length);
// System.arraycopy(sigHeader, 0, block,
// sigHeader.length + sha1.getDigestLength(), sigHeader.length);
Array.Copy(sigHeader, 0, block,
sigHeader.Length + sha1.GetDigestSize(), sigHeader.Length);
// byte[] sigBytes = signer.doFinal(block);
byte[] sigBytes = signer.ProcessBlock(block, 0, block.Length);
// Signature verifier = Signature.getInstance("SHA1WithRSA", "BC");
ISigner verifier = SignerUtilities.GetSigner("SHA1WithRSA");
// verifier.initVerify(pub);
verifier.Init(false, pub);
// verifier.update((byte)0);
verifier.Update(0);
// if (verifier.verify(sig))
if (verifier.VerifySignature(sigBytes))
{
// fail("bad signature passed");
Fail("bad signature passed");
}
}
