byte[] EncryptAsymmetricKeyParameter(AsymmetricKeyParameter key)
{
var cipher = PbeUtilities.CreateEngine(EncryptionAlgorithm.Id) as IBufferedCipher;
var keyInfo = PrivateKeyInfoFactory.CreatePrivateKeyInfo(key);
var random = new SecureRandom();
var salt = new byte[SaltSize];
if (cipher == null)
{
throw new Exception("Unknown encryption algorithm: " + EncryptionAlgorithm.Id);
}
random.NextBytes(salt);
var pbeParameters = PbeUtilities.GenerateAlgorithmParameters(EncryptionAlgorithm.Id, salt, MinIterations);
var algorithm = new AlgorithmIdentifier(EncryptionAlgorithm, pbeParameters);
var cipherParameters = PbeUtilities.GenerateCipherParameters(algorithm, passwd);
if (cipherParameters == null)
{
throw new Exception("BouncyCastle bug detected: Failed to generate cipher parameters.");
}
cipher.Init(true, cipherParameters);
var encoded = cipher.DoFinal(keyInfo.GetEncoded());
var encrypted = new EncryptedPrivateKeyInfo(algorithm, encoded);
return(encrypted.GetEncoded());
}
public PemObject Generate()
{
if (algorithm == null)
{
PrivateKeyInfo pki = PrivateKeyInfoFactory.CreatePrivateKeyInfo(privKey);
return(new PemObject("PRIVATE KEY", pki.GetEncoded()));
}
// TODO Theoretically, the amount of salt needed depends on the algorithm
byte[] salt = new byte[20];
if (random == null)
{
random = new SecureRandom();
}
random.NextBytes(salt);
try
{
EncryptedPrivateKeyInfo epki = EncryptedPrivateKeyInfoFactory.CreateEncryptedPrivateKeyInfo(
algorithm, password, salt, iterationCount, privKey);
return(new PemObject("ENCRYPTED PRIVATE KEY", epki.GetEncoded()));
}
catch (Exception e)
{
throw new PemGenerationException("Couldn't encrypt private key", e);
}
}
public PemObject Generate()
{
if (this.algorithm == null)
{
PrivateKeyInfo privateKeyInfo = PrivateKeyInfoFactory.CreatePrivateKeyInfo(this.privKey);
return(new PemObject("PRIVATE KEY", privateKeyInfo.GetEncoded()));
}
byte[] array = new byte[20];
if (this.random == null)
{
this.random = new SecureRandom();
}
this.random.NextBytes(array);
PemObject result;
try
{
EncryptedPrivateKeyInfo encryptedPrivateKeyInfo = EncryptedPrivateKeyInfoFactory.CreateEncryptedPrivateKeyInfo(this.algorithm, this.password, array, this.iterationCount, this.privKey);
result = new PemObject("ENCRYPTED PRIVATE KEY", encryptedPrivateKeyInfo.GetEncoded());
}
catch (Exception exception)
{
throw new PemGenerationException("Couldn't encrypt private key", exception);
}
return(result);
}
public PemObject Generate()
{
if (algorithm == null)
{
PrivateKeyInfo privateKeyInfo = PrivateKeyInfoFactory.CreatePrivateKeyInfo(privKey);
return(new PemObject("PRIVATE KEY", privateKeyInfo.GetEncoded()));
}
byte[] array = new byte[20];
if (random == null)
{
random = new SecureRandom();
}
((Random)random).NextBytes(array);
try
{
EncryptedPrivateKeyInfo encryptedPrivateKeyInfo = EncryptedPrivateKeyInfoFactory.CreateEncryptedPrivateKeyInfo(algorithm, password, array, iterationCount, privKey);
return(new PemObject("ENCRYPTED PRIVATE KEY", encryptedPrivateKeyInfo.GetEncoded()));
}
catch (global::System.Exception exception)
{
throw new PemGenerationException("Couldn't encrypt private key", exception);
}
}
/// <summary>
/// Return a binary ASN.1 encoding of the EncryptedPrivateKeyInfo structure in this object.
/// </summary>
/// <returns>A byte array containing the encoded object.</returns>
public byte[] GetEncoded()
{
return(encryptedPrivateKeyInfo.GetEncoded());
}
private static string EncryptPrivateKey(AsymmetricKeyParameter privateKey, string password)
{
// Create salts
byte[] aesIv = new byte[16];
byte[] keySalt = new byte[20];
SecureRandom randomGen = new SecureRandom();
randomGen.NextBytes(aesIv);
randomGen.NextBytes(keySalt);
try {
PrivateKeyInfo decryptedPrivateKeyInfo = PrivateKeyInfoFactory.CreatePrivateKeyInfo(privateKey);
// Prepare encryption
Pkcs5S2ParametersGenerator pkcs5S2Gen = new Pkcs5S2ParametersGenerator();
pkcs5S2Gen.Init(PKCS5PasswordToBytes(password.ToCharArray()), keySalt, hashIterationCount);
ICipherParameters cipherParams = pkcs5S2Gen.GenerateDerivedParameters(NistObjectIdentifiers.IdAes256Cbc.Id, 256);
IBufferedCipher cipher = CipherUtilities.GetCipher(NistObjectIdentifiers.IdAes256Cbc);
cipher.Init(true, new ParametersWithIV(cipherParams, aesIv));
// Generate encrypted private key info
Asn1OctetString aesIvOctetString = new DerOctetString(aesIv);
KeyDerivationFunc keyFunction = new KeyDerivationFunc(PkcsObjectIdentifiers.IdPbkdf2, new Pbkdf2Params(keySalt, hashIterationCount));
EncryptionScheme encScheme = new EncryptionScheme(NistObjectIdentifiers.IdAes256Cbc, aesIvOctetString);
Asn1EncodableVector encryptionInfo = new Asn1EncodableVector {
keyFunction, encScheme
};
AlgorithmIdentifier algIdentifier = new AlgorithmIdentifier(PkcsObjectIdentifiers.IdPbeS2, new DerSequence(encryptionInfo));
EncryptedPrivateKeyInfo encryptedPrivateKeyInfo = new EncryptedPrivateKeyInfo(algIdentifier, cipher.DoFinal(decryptedPrivateKeyInfo.GetEncoded()));
Org.BouncyCastle.Utilities.IO.Pem.PemObject pkPemObject = new Org.BouncyCastle.Utilities.IO.Pem.PemObject("ENCRYPTED PRIVATE KEY", encryptedPrivateKeyInfo.GetEncoded());
// Write the PEM object to a string
StringWriter txtWriter = new StringWriter();
PemWriter pemWriter = new PemWriter(txtWriter);
pemWriter.WriteObject(pkPemObject);
pemWriter.Writer.Close();
return(txtWriter.ToString());
} catch (Exception e) {
throw new CryptoException("Could not encrypt private key.", e);
}
}
