hey every one this is my decryption code i want to decrypt this password but problem is that its gives an error
static void Main(string[] args)
{
string str = Decrypt("vASqxLq4dmegE0l3K8T7ng==", "");
Console.WriteLine(str);
Console.ReadKey();
}
private const string IV = "MazenTech.com.pk";
private const int keysize = 128;
public static string Decrypt(string cipherText, string passPhrase)
{
byte[] plainTextBytes = null;
int decryptedByteCount = 0;
try
{
byte[] IVBytes = Encoding.ASCII.GetBytes(IV);
byte[] cipherTextBytes = Convert.FromBase64String(cipherText);
PasswordDeriveBytes password = new PasswordDeriveBytes(passPhrase, null);
byte[] keyBytes = password.GetBytes(keysize / 8);
RijndaelManaged symmetricKey = new RijndaelManaged();
symmetricKey.Mode = CipherMode.CBC;
ICryptoTransform decryptor = symmetricKey.CreateDecryptor(keyBytes, IVBytes);
MemoryStream memoryStream = new MemoryStream(cipherTextBytes);
CryptoStream cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read);
plainTextBytes = new byte[cipherTextBytes.Length];
decryptedByteCount = cryptoStream.Read(plainTextBytes, 0, plainTextBytes.Length); // error this line
memoryStream.Close();
cryptoStream.Close();
}
catch (Exception ex)
{
Console.WriteLine("Your Password is Incorrect....");
}
return Encoding.UTF8.GetString(plainTextBytes, 0, decryptedByteCount);
}
how to fix it please help me.
Try it by setting PeddingMode property.
RijndaelManaged symmetricKey = new RijndaelManaged();
symmetricKey.Mode = CipherMode.CBC;
symmetricKey.Padding = PaddingMode.None;
Related
I want to implement AES GCM encryption/decryption using shared secret.
But Backend server is throwing error with my keys. This is working fine in Android app with Java. Although size of encrypted text is same in both iOS and Android.
My iOS code.
private func getCryptoPublicKey() -> (privateKey: Curve25519.KeyAgreement.PrivateKey,publicKey :Curve25519.KeyAgreement.PublicKey){
let ephemeralKey = Curve25519.KeyAgreement.PrivateKey()
//AES.KeyWrap.wrap(SymmetricKey(size: .bits256), using: <#T##SymmetricKey#>)
let ephemeralPublicKey = ephemeralKey.publicKey
let privateKey = ephemeralKey.rawRepresentation.base64EncodedString()
let publicKey = ephemeralPublicKey.rawRepresentation.base64EncodedString()
Singleton.shared.clientPrivateKey = privateKey
Singleton.shared.clientPublicKey = publicKey
return (ephemeralKey,ephemeralPublicKey)
}
let cryptoData = self.getCryptoPublicKey()
let publicKeyData = Data.init(base64Encoded: ServerPublicKey)! //ServerPublicKey is shared by server
let serverPublicKey = try! Curve25519.KeyAgreement.PublicKey(rawRepresentation: publicKeyData)
let clientSharedSecret = try! cryptoData.privateKey.sharedSecretFromKeyAgreement(with: serverPublicKey)
let clientSharedSecretSymmetricKey = clientSharedSecret.x963DerivedSymmetricKey(using: SHA256.self, sharedInfo: Data(), outputByteCount: 32)
let clientSealedBoxDatakClientId = try! AES.GCM.seal(kClientId.data(using: .utf8)!, using: clientSharedSecretSymmetricKey).combined!
let clientSealedBoxDatakClientSecret = try! AES.GCM.seal(kClientSecret.data(using: .utf8)!, using: clientSharedSecretSymmetricKey).combined!
let clientSealedBoxDataCredent = try! AES.GCM.seal("client_credentials".data(using: .utf8)!, using: clientSharedSecretSymmetricKey).combined!
let clientIDEncryptedBase64Str = clientSealedBoxDatakClientId.base64EncodedString()
let clientSecretEncryptedBase64Str = clientSealedBoxDatakClientSecret.base64EncodedString()
let clientCredentialsEncryptedBase64Str = clientSealedBoxDataCredent.base64EncodedString()
JAVA CODE:
`
private void makeKeyExchangeParams() {
KeyPairGenerator kpg;
try {
kpg = KeyPairGenerator.getInstance("X25519", new org.bouncycastle.jce.provider.BouncyCastleProvider());
kpg.initialize(AES_KEY_SIZE);
KeyPair kp = kpg.generateKeyPair();
publickey = kp.getPublic();
keyAgreement = KeyAgreement.getInstance("XDH", new org.bouncycastle.jce.provider.BouncyCastleProvider());
keyAgreement.init(kp.getPrivate());
} catch (NoSuchAlgorithmException | InvalidKeyException e) {
e.printStackTrace();
}
}
package com.bankofbaroda.bobabhivyakti.Utilities.Encryption;
import android.os.Build;
import androidx.annotation.RequiresApi;
import javax.crypto.*;
import javax.crypto.spec.GCMParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.security.*;
import java.util.Base64;
public class CryptoService {
public static final int GCM_IV_LENGTH = 12;
public static final int GCM_TAG_LENGTH = 16;
#RequiresApi(api = Build.VERSION_CODES.O)
public static String getEncryptedText(String plainText, SecretKey secretKey) {
if(plainText == null) {
plainText = "";
}
try {
byte[] ivBytes = new byte[GCM_IV_LENGTH];
SecureRandom random = new SecureRandom();
random.nextBytes(ivBytes);
String iv = Base64.getEncoder().encodeToString(ivBytes);
byte[] cipherText = encrypt(plainText.getBytes(), secretKey, ivBytes);
String text = Base64.getEncoder().encodeToString(cipherText);
text = iv+text;
return text;
} catch (Exception e) {
e.printStackTrace();
return "";
}
}
#RequiresApi(api = Build.VERSION_CODES.O)
public static String getDecryptedText(String cipherText, SecretKey secretKey) {
try {
String iv = cipherText.substring(0,16);
byte[] ivBytes = Base64.getDecoder().decode(iv);
cipherText = cipherText.substring(16);
byte[] data = Base64.getDecoder().decode(cipherText);
return decrypt(data, secretKey, ivBytes);
} catch (Exception e) {
e.printStackTrace();
return "";
}
}
private static byte[] encrypt(byte[] plaintext, SecretKey key, byte[] nonce) throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding");
SecretKeySpec keySpec = new SecretKeySpec(key.getEncoded(), "AES");
GCMParameterSpec gcmParameterSpec = new GCMParameterSpec(GCM_TAG_LENGTH * 8, nonce);
cipher.init(Cipher.ENCRYPT_MODE, keySpec, gcmParameterSpec);
return cipher.doFinal(plaintext);
}
private static String decrypt(byte[] cipherText, SecretKey key, byte[] nonce) throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding");
SecretKeySpec keySpec = new SecretKeySpec(key.getEncoded(), "AES");
GCMParameterSpec gcmParameterSpec = new GCMParameterSpec(GCM_TAG_LENGTH * 8, nonce);
cipher.init(Cipher.DECRYPT_MODE, keySpec, gcmParameterSpec);
byte[] decryptedText = cipher.doFinal(cipherText);
return new String(decryptedText);
}
}
`
I am not able to get what is exact issue here. Do I have to change something on Java side?
I'm struggling with the PCLCryptho libraby, I can't get it working without retrieving the exception 'CryptographicException: Bad PKCS7 padding. Invalid length'. Running the code once is working, but running it multiple times after each other fails (with different input strings). The decryption takes place after a new instance of the program. I'm running this code on iOS with Xamarin Forms. Here's my code (I'm using the same VI each time and save the salt in the Settinsg for now):
public static string EncryptAnswer(string answer, string passWord)
{
try
{
var keyMaterial = CreateKey(passWord);
var cipherTextBuffer = GetBytes(answer);
var symmetricAlgorithm = WinRTCrypto.SymmetricKeyAlgorithmProvider.OpenAlgorithm(SymmetricAlgorithm.AesCbcPkcs7);
var symmetricKey = symmetricAlgorithm.CreateSymmetricKey(keyMaterial);
using (var encryptor = WinRTCrypto.CryptographicEngine.CreateEncryptor(symmetricKey, GetBytes("vivivivivivivivi")))
{
using (var ms = new MemoryStream())
{
using (var cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write))
{
using (var bWriter = new BinaryWriter(cs))
{
bWriter.Write(cipherTextBuffer, 0, cipherTextBuffer.Length);
cs.FlushFinalBlock();
}
}
return GetString(ms.ToArray());
}
}
}
catch (Exception e)
{
return string.Empty;
}
}
public static string DecryptAnswer(string encryptedAnswer, string passWord)
{
try
{
var cipherTextBuffer = GetBytes(encryptedAnswer);
var keyMaterial = CreateKey(passWord);
var symmetricAlgorithm = WinRTCrypto.SymmetricKeyAlgorithmProvider.OpenAlgorithm(SymmetricAlgorithm.AesCbcPkcs7);
var symmetricKey = symmetricAlgorithm.CreateSymmetricKey(keyMaterial);
using (var decryptor = WinRTCrypto.CryptographicEngine.CreateDecryptor(symmetricKey, GetBytes("vivivivivivivivi")))
{
using (var ms = new MemoryStream())
{
using (var cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Write))
using (var binWriter = new BinaryWriter(cs))
{
binWriter.Write(cipherTextBuffer, 0, cipherTextBuffer.Length);
}
return GetString(ms.ToArray());
}
}
}
catch (Exception e)
{
}
return string.Empty;
}
public static byte[] CreateSalt()
{
var salt = WinRTCrypto.CryptographicBuffer.GenerateRandom(8);
CrossSettings.Current.AddOrUpdateValue("Salt", GetString(salt));
return salt;
}
private static byte[] GetSalt()
{
var saltString = CrossSettings.Current.GetValueOrDefault<string>("Salt");
var salt = GetBytes(saltString);
return salt;
}
private static byte[] CreateKey(string passWord)
{
var key = NetFxCrypto.DeriveBytes.GetBytes(passWord, GetSalt(), 1000, 32);
return key;
}
private static byte[] GetBytes(string str)
{
return Encoding.Unicode.GetBytes(str);
}
private static string GetString(byte[] bytes)
{
return Encoding.Unicode.GetString(bytes, 0, bytes.Length);
}
This seems to be equal to the answers and examples I found. Can someone tell me what's wrong?
I have created an Encryption method to encrypt the data into test.txt Text file. The encryption is Working fine and its Reading the encryted text file into textBox1.
I m using 2 buttons and 2 textBox for doing this.
Now I want to Read the decryption text from test.txt in textBox2
but when i click on the button to read data from test.txt to textBox2.
I am getting an exception like (CryptographicException was unhandled) Bad Data.
Here is the code I used for Dycryption.
private void button2_Click(object sender, EventArgs e)
{
FileStream stream = new FileStream("C:\\test.txt",
FileMode.Open, FileAccess.Read);
DESCryptoServiceProvider cryptic = new DESCryptoServiceProvider();
cryptic.Key = ASCIIEncoding.ASCII.GetBytes("ABCDEFGH");
cryptic.IV = ASCIIEncoding.ASCII.GetBytes("ABCDEFGH");
CryptoStream crStream = new CryptoStream(stream,
cryptic.CreateDecryptor(), CryptoStreamMode.Read);
StreamReader reader = new StreamReader(crStream);
//string data = reader.ReadToEnd();
textBox2.Text = reader.ReadLine();
//stream.Close();
}
Codes that i used for Encrytion is here:
private void button1_Click(object sender, EventArgs e)
{
FileStream stream = new FileStream("C:\\test.txt", FileMode.OpenOrCreate, FileAccess.Write);
DESCryptoServiceProvider cryptic = new DESCryptoServiceProvider();
cryptic.Key = ASCIIEncoding.ASCII.GetBytes("ABCDEFGH");
cryptic.IV = ASCIIEncoding.ASCII.GetBytes("ABCDEFGH");
CryptoStream crStream = new CryptoStream(stream,
cryptic.CreateEncryptor(), CryptoStreamMode.Write);
byte[] data = ASCIIEncoding.ASCII.GetBytes(textBox2.Text);
crStream.Write(data, 0, data.Length);
crStream.Close();
stream.Close();
string text = System.IO.File.ReadAllText(#"C://test.txt");
textBox1.Text = text.ToString();
}
I don't know why you want to read it from test.txt file. when your displaying it in textbox. but check below code you can able to encrypt and decry-pt and meanwhile able to display and save in text boxes.
protected void Button1_Click(object sender, EventArgs e)
{
FileStream stream = new FileStream("C:\\test.txt", FileMode.OpenOrCreate, FileAccess.Write);
string datastring= Encrypt("ABCDEFGH", "ABCDEFGH");
byte[] data = ASCIIEncoding.ASCII.GetBytes(datastring);
stream.Write(data, 0, data.Length);
stream.Close();
string text = System.IO.File.ReadAllText(#"C:\\test.txt");
TextBox1.Text = text.ToString();
}
protected void Button2_Click(object sender, EventArgs e)
{
StreamReader reader =null;
try
{
FileStream stream = new FileStream("C:\\test.txt",
FileMode.Open, FileAccess.Read);
string fileContents;
using ( reader = new StreamReader(stream))
{
fileContents = reader.ReadToEnd();
}
string data = Decrypt(fileContents, "ABCDEFGH");
TextBox2.Text = data;
stream.WriteByte(Convert.ToByte(data));
stream.Close();
}
catch (Exception ex)
{
}
finally
{
reader.Close();
}
}
public static string Encrypt(string message, string password)
{
// Encode message and password
byte[] messageBytes = ASCIIEncoding.ASCII.GetBytes(message);
byte[] passwordBytes = ASCIIEncoding.ASCII.GetBytes(password);
// Set encryption settings -- Use password for both key and init. vector
DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
ICryptoTransform transform = provider.CreateEncryptor(passwordBytes, passwordBytes);
CryptoStreamMode mode = CryptoStreamMode.Write;
// Set up streams and encrypt
MemoryStream memStream = new MemoryStream();
CryptoStream cryptoStream = new CryptoStream(memStream, transform, mode);
cryptoStream.Write(messageBytes, 0, messageBytes.Length);
cryptoStream.FlushFinalBlock();
// Read the encrypted message from the memory stream
byte[] encryptedMessageBytes = new byte[memStream.Length];
memStream.Position = 0;
memStream.Read(encryptedMessageBytes, 0, encryptedMessageBytes.Length);
// Encode the encrypted message as base64 string
string encryptedMessage = Convert.ToBase64String(encryptedMessageBytes);
return encryptedMessage;
}
public static string Decrypt(string encryptedMessage, string password)
{
// Convert encrypted message and password to bytes
byte[] encryptedMessageBytes = Convert.FromBase64String(encryptedMessage);
byte[] passwordBytes = ASCIIEncoding.ASCII.GetBytes(password);
// Set encryption settings -- Use password for both key and init. vector
DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
ICryptoTransform transform = provider.CreateDecryptor(passwordBytes, passwordBytes);
CryptoStreamMode mode = CryptoStreamMode.Write;
// Set up streams and decrypt
MemoryStream memStream = new MemoryStream();
CryptoStream cryptoStream = new CryptoStream(memStream, transform, mode);
cryptoStream.Write(encryptedMessageBytes, 0, encryptedMessageBytes.Length);
cryptoStream.FlushFinalBlock();
// Read decrypted message from memory stream
byte[] decryptedMessageBytes = new byte[memStream.Length];
memStream.Position = 0;
memStream.Read(decryptedMessageBytes, 0, decryptedMessageBytes.Length);
// Encode deencrypted binary data to base64 string
string message = ASCIIEncoding.ASCII.GetString(decryptedMessageBytes);
return message;
}
node js code：
function AES_encrypt(){
var bKey = new Buffer('24Qn9974h50D9DNi', 'utf-8');
var bInput = new Buffer(‘test’, 'utf-8');
console.log(bKey.length);
var cipher = crypto.createCipher('AES-128-ECB',bKey);
//cipher.setAutoPadding(auto_padding=false);
var crypted = cipher.update(bInput,null,'base64');
crypted+=cipher.final('base64');
console.log(crypted);
return crypted;
}
get Result：57b6b7oulw7eO5h7efZ9/w==
java code：
main java：
String data = AES.encryptToBase64("test","24Qn9974h50D9DNi");
AES java：
public static String encryptToBase64(String data, String key){
try {
byte[] valueByte = encrypt(data.getBytes("utf-8"), key.getBytes("utf-8");
return new String(Base64.encode(valueByte));
} catch (UnsupportedEncodingException e) {
throw new RuntimeException("encrypt fail!", e);
}
}
public static byte[] encrypt(byte[] data, byte[] key) {
if(key.length!=16){
throw new RuntimeException("Invalid AES key length (must be 16 bytes)");
}
try {
SecretKeySpec secretKey = new SecretKeySpec(key, "AES");
byte[] enCodeFormat = secretKey.getEncoded();
SecretKeySpec seckey = new SecretKeySpec(enCodeFormat,"AES");
Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, seckey);// 初始化
byte[] result = cipher.doFinal(data);
return result; // 加密
} catch (Exception e){
throw new RuntimeException("encrypt fail!", e);
}
}
get Result：wA1JU6VxMaVl8Ck8pBrX8A==
Use crypto.createCipheriv to solve the issue,
http://nodejs.org/api/crypto.html#crypto_crypto_createcipheriv_algorithm_key_iv
You need to pad the string "test" to 16 bytes. I believe Java uses PKCS padding by default (but there are other padding schemes, too).
String data = AES.encryptToBase64("test","24Qn9974h50D9DNi");
Here is the code, but it prompts error:
The image o3lceiy3.ioa201305211013360129.vhd does not exist.
the subscriptionId and X509Certificate2 are valid
internal class Program
{
public static X509Certificate2 Certificate { get; set; }
private static void Main(string[] args)
{
const string subscriptionId = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx";
//#"https://management.core.windows.net/<subscription-id>/services/hostedservices/<cloudservice-name>/deployments";
var url = string.Format("https://management.core.windows.net/{0}/services/hostedservices/{1}/deployments",
subscriptionId, "edoc2cloudtest");
var myReq = (HttpWebRequest)WebRequest.Create(url);
myReq.Method = "POST";
myReq.Headers.Add("x-ms-version", "2012-03-01");
myReq.Proxy = null;
myReq.Timeout = 30000;
myReq.ContentType = "application/xml";
var postData = ReadConfig();
using (var reqStream = myReq.GetRequestStream())
{
var data = Encoding.UTF8.GetBytes(postData);
reqStream.Write(data, 0, data.Length);
reqStream.Flush();
}
Certificate = GetX509Certificate();
myReq.ClientCertificates.Add(Certificate);
try
{
var myRes = (HttpWebResponse) myReq.GetResponse();
}
catch (WebException exWeb)
{
// Parse the web response.
Stream responseStream = exWeb.Response.GetResponseStream();
StreamReader reader = new StreamReader(responseStream);
XmlDocument xDocResp = new XmlDocument();
xDocResp.Load(reader);
HttpWebResponse responseStatus = (HttpWebResponse)exWeb.Response;
responseStream.Close();
reader.Close();
var result = NiceFormatXml(xDocResp);
Console.WriteLine(result);
}
}
private static string NiceFormatXml(XmlDocument xDoc)
{
StringBuilder niceString = new StringBuilder();
StringWriter strWriter = new StringWriter(niceString);
XmlTextWriter xmlWriter = new XmlTextWriter(strWriter);
xmlWriter.Formatting = Formatting.Indented;
xDoc.WriteTo(xmlWriter);
xmlWriter.Close();
strWriter.Close();
return niceString.ToString();
}
private static X509Certificate2 GetX509Certificate()
{
X509Certificate2 certificate2 = null;
var store = new X509Store("MY", StoreLocation.CurrentUser);
store.Open(OpenFlags.ReadOnly | OpenFlags.OpenExistingOnly);
var collection = store.Certificates;
var fcollection = collection.Find(X509FindType.FindByTimeValid, DateTime.Now, false);
const string certificateThumbprint = "7dfbc7369306ed096b7e5c7b4ba6e99f190240e9";
store.Close();
if (fcollection.Count > 0)
{
foreach (var variable in fcollection)
{
if (variable.Thumbprint != null &&
variable.Thumbprint.Equals(certificateThumbprint, StringComparison.InvariantCultureIgnoreCase))
{
certificate2 = variable;
}
}
}
return certificate2;
}
private static string ReadConfig()
{
string path = System.AppDomain.CurrentDomain.BaseDirectory + "Edoc2Cloud.xml";
//string path = System.AppDomain.CurrentDomain.BaseDirectory + "VM-CreateVM.xml";
string s;
using (var sr = new StreamReader(path, Encoding.GetEncoding("GB2312")))
{
s = sr.ReadToEnd();
}
return s;
}
}
Here is the XML:
<Deployment xmlns="http://schemas.microsoft.com/windowsazure" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
<Name>EDoc2Test</Name>
<DeploymentSlot>Staging</DeploymentSlot>
<Label>EDoc2Testlabe</Label>
<RoleList>
<Role>
<RoleName>EDoc2TestRoleName</RoleName>
<RoleType>PersistentVMRole</RoleType>
<ConfigurationSets>
<ConfigurationSet>
<ConfigurationSetType>WindowsProvisioningConfiguration</ConfigurationSetType>
<ComputerName>computer-name</ComputerName>
<AdminPassword>APasswor_324d</AdminPassword>
<EnableAutomaticUpdates>true</EnableAutomaticUpdates>
</ConfigurationSet>
</ConfigurationSets>
<AvailabilitySetName>EDoc2TestSetName</AvailabilitySetName>
<OSVirtualHardDisk>
<HostCaching>ReadWrite</HostCaching>
<DiskName>SomeName-0-20121007173943</DiskName>
<MediaLink>http://portalvhdsx4flx9dhmjyt1.blob.core.windows.net/vhds/o3lceiy3.ioa201305211013360129.vhd</MediaLink>
<SourceImageName>o3lceiy3.ioa201305211013360129.vhd</SourceImageName>
</OSVirtualHardDisk>
<RoleSize>Medium</RoleSize>
</Role>
Based on the error you're receiving and the XML you've specified, can you please check if there is an image by the name o3lceiy3.ioa201305211013360129.vhd in your custom images? You could find that information by logging into the portal and going to Virtual Machines --> Images.
Documentation regarding <SourceImageName> parameter states that it is needed when you want to create a virtual machine either by using system or custom images.
You can read the complete documentation here: http://msdn.microsoft.com/en-us/library/windowsazure/jj157186.aspx#OSVirtualHardDisk.