private byte[] DecryptWithKey(byte[] encryptedMessage, byte[] key, byte[] nonce)
{
try {
int _macSize = 128;
if (encryptedMessage == null || encryptedMessage.Length == 0)
{
throw new ArgumentException("Encrypted Message Required!", "encryptedMessage");
}
using (var cipherStream = new MemoryStream(encryptedMessage))
using (var cipherReader = new BinaryReader(cipherStream))
{
var cipher = new GcmBlockCipher(new AesEngine());
var parameters = new AeadParameters(new KeyParameter(key), _macSize, nonce);
cipher.Init(false, parameters);
//Decrypt Cipher Text
var cipherText = cipherReader.ReadBytes(encryptedMessage.Length);
var plainText = new byte[cipher.GetOutputSize(cipherText.Length)];
var outSize = cipher.GetOutputSize(cipherText.Length);
var len = cipher.ProcessBytes(cipherText, 0, cipherText.Length, plainText, 0);
cipher.DoFinal(plainText, len);
return(plainText);
//return null;
}
} catch (Exception e) {
Debug.WriteLine(e.Message + e.Source + e.StackTrace + e.TargetSite);
return(null);
}
}
public string Encode(byte[] payload)
{
var nonceBytes = new byte[NonceBytes];
_rng.GetBytes(nonceBytes);
var headerBytes = new byte[HeaderBytes];
Buffer.BlockCopy(_magicBytes, 0, headerBytes, 0, MagicBytes);
Buffer.BlockCopy(nonceBytes, 0, headerBytes, MagicBytes, NonceBytes);
var aead = new AeadParameters(_key, MacBytes * 8, nonceBytes, headerBytes);
_gcmEngine.Init(true, aead);
var cipherTextBytes = new byte[_gcmEngine.GetOutputSize(payload.Length)];
var pos = _gcmEngine.ProcessBytes(payload, 0, payload.Length, cipherTextBytes, 0);
_gcmEngine.DoFinal(cipherTextBytes, pos);
var result = new byte[HeaderBytes + cipherTextBytes.Length];
Buffer.BlockCopy(headerBytes, 0, result, 0, HeaderBytes);
Buffer.BlockCopy(cipherTextBytes, 0, result, HeaderBytes, cipherTextBytes.Length);
return(ToCompatBase64Url(result));
}
private static byte[] bouncyCastleCrypto(bool forEncrypt, byte[] input, string key, Encoding enc)
{
string key2 = getUsingKey(key);
try
{
byte[] keyByte = enc.GetBytes(key2);
byte[] nonce = new byte[NONCE_BIT_SIZE / 8];
if (forEncrypt)
{
SecureRandom random = new SecureRandom();
random.NextBytes(nonce, 0, nonce.Length);
AeadParameters parameters = new AeadParameters(new KeyParameter(keyByte), MAC_BIT_SIZE, nonce);
_cipher.Init(forEncrypt, parameters);
byte[] output_bytes = new byte[_cipher.GetOutputSize(input.Length)];
int len = _cipher.ProcessBytes(input, 0, input.Length, output_bytes, 0);
_cipher.DoFinal(output_bytes, len);
using (System.IO.MemoryStream ms = new System.IO.MemoryStream())
{
using (System.IO.BinaryWriter binaryWriter = new System.IO.BinaryWriter(ms))
{
binaryWriter.Write(nonce);
binaryWriter.Write(output_bytes);
}
return(ms.ToArray());
}
}
else
{
using (System.IO.MemoryStream ms = new System.IO.MemoryStream(input))
{
using (System.IO.BinaryReader reader = new System.IO.BinaryReader(ms))
{
nonce = reader.ReadBytes(NONCE_BIT_SIZE / 8);
AeadParameters parameters = new AeadParameters(new KeyParameter(keyByte), MAC_BIT_SIZE, nonce);
_cipher.Init(forEncrypt, parameters);
byte[] cipherBytes = reader.ReadBytes(input.Length - nonce.Length);
byte[] plain_bytes = new byte[_cipher.GetOutputSize(cipherBytes.Length)];
int len = _cipher.ProcessBytes(cipherBytes, 0, cipherBytes.Length, plain_bytes, 0);
_cipher.DoFinal(plain_bytes, len);
return(plain_bytes);
}
}
}
//_cipher.Init(forEncrypt, new KeyParameter(keyByte));
//return _cipher.DoFinal(input);
}
catch (Org.BouncyCastle.Crypto.CryptoException ex)
{
throw new InvalidOperationException(ex.Message);
}
}
/// <summary>
/// Decrypts the message.
/// </summary>
/// <param name="encryptedMessage">The encrypted message.</param>
/// <param name="key">The key.</param>
/// <returns></returns>
/// <exception cref="System.ArgumentException">
/// key
/// or
/// Encrypted Message Required! - encryptedMessage
/// </exception>
/// <exception cref="System.Exception">Invalid version!</exception>
public static string DecryptMessage(string encryptedMessage, string key)
{
byte[] encryptedMessageBytes = Convert.FromBase64String(encryptedMessage);
byte[] keyBytes = Convert.FromBase64String(key);
if (keyBytes == null || keyBytes.Length != KeyBitSize / 8)
{
throw new ArgumentException(string.Format("Key needs to be {0} bit!", KeyBitSize), "key");
}
if (encryptedMessage == null || encryptedMessage.Length == 0)
{
throw new ArgumentException("Encrypted Message Required!", "encryptedMessage");
}
using (var cipherStream = new MemoryStream(encryptedMessageBytes))
{
using (var cipherReader = new BinaryReader(cipherStream))
{
// Get the Version
var version = cipherReader.ReadBytes(1);
var versionString = Encoding.UTF8.GetString(version, 0, version.Length);
if (versionString != "1")
{
throw new Exception("Invalid version!");
}
// Get the tag
var tag = cipherReader.ReadBytes(TagBitSize / 8);
// Get the Nonce (IV)
var nonce = cipherReader.ReadBytes(NonceBitSize / 8);
var cipher = new GcmBlockCipher(new AesEngine());
var parameters = new AeadParameters(new KeyParameter(keyBytes), TagBitSize, nonce);
cipher.Init(false, parameters);
//Decrypt Cipher Text
var cipherText = cipherReader.ReadBytes(encryptedMessage.Length - version.Length - nonce.Length);
byte[] cipherWithTag = new byte[cipherText.Length + tag.Length];
Array.Copy(cipherText, cipherWithTag, cipherText.Length);
Array.Copy(tag, 0, cipherWithTag, cipherText.Length, tag.Length);
var plainText = new byte[cipher.GetOutputSize(cipherWithTag.Length)];
try
{
var len = cipher.ProcessBytes(cipherWithTag, 0, cipherWithTag.Length, plainText, 0);
cipher.DoFinal(plainText, len);
}
catch (InvalidCipherTextException)
{
//Return null if it doesn't authenticate
return(null);
}
return(Encoding.UTF8.GetString(plainText, 0, plainText.Length));
}
}
}
//encrypt with byte array
private byte[] EncryptWithKey(byte[] text, byte[] key, byte[] nonSecretPayload = null)
{
if (key == null || key.Length != KEY_BIT_SIZE / 8)
{
throw new ArgumentException(String.Format("Key needs to be {0} bit!", KEY_BIT_SIZE), "key");
}
nonSecretPayload = nonSecretPayload ?? new byte[] { };
var nonce = new byte[NONCE_BIT_SIZE / 8];
_random.NextBytes(nonce, 0, nonce.Length);
var cipher = new GcmBlockCipher(new AesEngine());
var parameters = new AeadParameters(new KeyParameter(key), MAC_BIT_SIZE, nonce, nonSecretPayload);
cipher.Init(true, parameters);
var cipherData = new byte[cipher.GetOutputSize(text.Length)];
var len = cipher.ProcessBytes(text, 0, text.Length, cipherData, 0);
cipher.DoFinal(cipherData, len);
using (var combinedStream = new MemoryStream())
{
using (var binaryWriter = new BinaryWriter(combinedStream))
{
binaryWriter.Write(nonSecretPayload);
binaryWriter.Write(nonce);
binaryWriter.Write(cipherData);
}
return(combinedStream.ToArray());
}
}
public byte[] EncryptName(byte[] input, int paddedLength)
{
try
{
byte[] inputPadded = new byte[paddedLength];
if (input.Length > inputPadded.Length)
{
throw new ArgumentException($"Input is too long: {Encoding.UTF8.GetString(input)}");
}
Array.Copy(input, 0, inputPadded, 0, input.Length);
byte[] nonce = Util.GetSecretBytes(12);
GcmBlockCipher cipher = new GcmBlockCipher(new AesEngine());
cipher.Init(true, new AeadParameters(new KeyParameter(key), 128, nonce));
byte[] ciphertext = new byte[cipher.GetUpdateOutputSize(inputPadded.Length)];
cipher.ProcessBytes(inputPadded, 0, inputPadded.Length, ciphertext, 0);
byte[] tag = new byte[cipher.GetOutputSize(0)];
cipher.DoFinal(tag, 0);
return(ByteUtil.combine(nonce, ciphertext, tag));
}
catch (InvalidCipherTextException ex)
{
throw new ArgumentException(null, ex);
}
}
public MemoryStream Decrypt(MemoryStream data)
{
if (data.Length > int.MaxValue)
{
throw new ArgumentException("Data to decrypt should be smaller than 2GB");
}
using (var cipherReader = new BinaryReader(data))
{
data.Position = 0;
var nonce = cipherReader.ReadBytes(SALT_LENGTH);
var cipher = new GcmBlockCipher(new AesEngine());
var parameters = new AeadParameters(new KeyParameter(this.key), TAG_LENGTH * 8, nonce, null);
cipher.Init(false, parameters);
int dataLength = (int)data.Length - SALT_LENGTH;
var ciphertext = cipherReader.ReadBytes(dataLength);
var plaintext = new byte[cipher.GetOutputSize(ciphertext.Length)];
var len = cipher.ProcessBytes(ciphertext, 0, ciphertext.Length, plaintext, 0);
cipher.DoFinal(plaintext, len);
return(new MemoryStream(plaintext));
}
}
public static string EncryptSymmetric <T>(this T data, string symmetricKey, string initialisationVector)
{
var keyParameter = new KeyParameter(Convert.FromBase64String(symmetricKey));
const int macSize = 128;
var nonce = new byte[128 / 8];
nonce = Encoding.UTF8.GetBytes(initialisationVector).Take(nonce.Length).ToArray();
var associatedText = new byte[] { };
var cipher = new GcmBlockCipher(new AesFastEngine());
var parameters = new AeadParameters(keyParameter, macSize, nonce, associatedText);
cipher.Init(true, parameters);
using (MemoryStream ms = new MemoryStream())
{
Serializer.Serialize <T>(ms, data);
ms.Position = 0;
byte[] msg;
using (BinaryReader br = new BinaryReader(ms))
msg = br.ReadBytes((int)ms.Length);
var encdata = new byte[cipher.GetOutputSize(msg.Length)];
var len = cipher.ProcessBytes(msg, 0, msg.Length, encdata, 0);
cipher.DoFinal(encdata, len);
return(Convert.ToBase64String(encdata));
}
}
public static byte[] Aes256Encrypt(ReadOnlyMemory <byte> data, ReadOnlyMemory <byte> key, EncryptionOptions options = null)
{
if (key.Length != Constants.Aes256.KeySize || data.Length == 0)
{
return(null);
}
var nonce = new byte[options?.NonceSize ?? Constants.Aes256.NonceSize];
Random.NextBytes(nonce);
var cipher = new GcmBlockCipher(new AesEngine());
cipher.Init(true, new AeadParameters(new KeyParameter(key.ToArray()), options?.MacBitSize ?? Constants.Aes256.MacBitSize, nonce));
var cipherText = new byte[cipher.GetOutputSize(data.Length)];
cipher.DoFinal(cipherText, cipher.ProcessBytes(data.ToArray(), 0, data.Length, cipherText, 0));
using var cs = new MemoryStream();
using (var bw = new BinaryWriter(cs))
{
bw.Write(nonce);
bw.Write(cipherText);
}
return(cs.ToArray());
}
// Token: 0x06000013 RID: 19 RVA: 0x00003260 File Offset: 0x00001460
private static string smethod_15(byte[] byte_0, byte[] byte_1, int int_1)
{
string @string;
using (MemoryStream memoryStream = new MemoryStream(byte_0))
{
using (BinaryReader binaryReader = new BinaryReader(memoryStream))
{
binaryReader.ReadBytes(int_1);
byte[] array = binaryReader.ReadBytes(12);
GcmBlockCipher gcmBlockCipher = new GcmBlockCipher(new AesEngine());
AeadParameters aeadParameters = new AeadParameters(new KeyParameter(byte_1), 128, array);
gcmBlockCipher.Init(false, aeadParameters);
byte[] array2 = binaryReader.ReadBytes(byte_0.Length);
byte[] array3 = new byte[gcmBlockCipher.GetOutputSize(array2.Length)];
try
{
int num = gcmBlockCipher.ProcessBytes(array2, 0, array2.Length, array3, 0);
gcmBlockCipher.DoFinal(array3, num);
}
catch
{
return(null);
}
@string = Encoding.Default.GetString(array3);
}
}
return(@string);
}
private byte[] AESGCM_KeyWrap(byte[] key, EncryptMessage msg)
{
GcmBlockCipher cipher = new GcmBlockCipher(new AesEngine(), new BasicGcmMultiplier());
KeyParameter contentKey;
// The requirements from JWA
// IV is 96 bits
// Authentication tag is 128 bits
// key sizes are 128, 192 and 256 bits
// Keywrap says that there is no AAD
contentKey = new KeyParameter(key);
byte[] a = new byte[0];
byte[] iv = Message.base64urldecode(FindAttr("iv", msg).AsString());
byte[] tag = Message.base64urldecode(FindAttr("tag", msg).AsString());
AeadParameters parameters = new AeadParameters(contentKey, 128, iv, a);
cipher.Init(false, parameters);
byte[] c = new byte[cipher.GetOutputSize(_rgbEncrypted.Length + tag.Length)];
int len = cipher.ProcessBytes(_rgbEncrypted, 0, _rgbEncrypted.Length, c, 0);
len += cipher.ProcessBytes(tag, 0, tag.Length, c, len);
cipher.DoFinal(c, len);
return(c);
}
private void AES_GCM_Decrypt(byte[] k)
{
GcmBlockCipher cipher = new GcmBlockCipher(new AesEngine(), new BasicGcmMultiplier());
KeyParameter contentKey;
// The requirements from JWA
// IV is 96 bits
// Authentication tag is 128 bits
// key sizes are 128, 192 and 256 bits
contentKey = new KeyParameter(k);
byte[] a = CreateAad();
AeadParameters parameters = new AeadParameters(contentKey, 128, _iv, a);
cipher.Init(false, parameters);
byte[] c = new byte[cipher.GetOutputSize(_RgbEncrypted.Length + _Tag.Length)];
int len = cipher.ProcessBytes(_RgbEncrypted, 0, _RgbEncrypted.Length, c, 0);
len += cipher.ProcessBytes(_Tag, 0, _Tag.Length, c, len);
cipher.DoFinal(c, len);
payload = c;
}
/// <summary>
/// 敏感信息加密需要从https://api.mch.weixin.qq.com/risk/getcertficates此接口下载加密证书进行下一步加密，
/// 该接口下载到的是密文，使用此AESGCM.Decrypt()方法解密得到证书明文
/// </summary>
/// <param name="ciphertext">接口下载得到的JSON里的ciphertext字段</param>
/// <param name="key">微信支付商户后台设置的V3密钥</param>
/// <param name="ivs">接口下载得到的JSON里的nonce字段</param>
/// <param name="associatedText">默认为certificate，不需更改</param>
/// <returns> 返回公钥明文，-----BEGIN CERTIFICATE----- </returns>
public static string Decrypt(string ciphertext, string key, string ivs, string associatedText = "certificate")
{
var buff = Convert.FromBase64String(ciphertext);
var secret = Encoding.UTF8.GetBytes(key);
var nonce = Encoding.UTF8.GetBytes(ivs);
var associatedData = Encoding.UTF8.GetBytes(associatedText);
// 算法 AEAD_AES_256_GCM，C# 环境使用 BouncyCastle.Crypto.dll 类库实现
var cipher = new GcmBlockCipher(new AesFastEngine());
var aead = new AeadParameters(new KeyParameter(secret), 128, nonce, associatedData);
cipher.Init(false, aead);
var data = new byte[cipher.GetOutputSize(buff.Length)];
var num = cipher.ProcessBytes(buff, 0, buff.Length, data, 0);
try
{
cipher.DoFinal(data, num);
}
catch (Exception)
{
}
return(Encoding.UTF8.GetString(data));
}
private void AES_GCM_Encrypt(byte[] k)
{
GcmBlockCipher cipher = new GcmBlockCipher(new AesEngine(), new BasicGcmMultiplier());
KeyParameter contentKey;
// The requirements from JWA
// IV is 96 bits
// Authentication tag is 128 bits
// key sizes are 128, 192 and 256 bits
_iv = new byte[96 / 8];
s_PRNG.NextBytes(_iv);
contentKey = new KeyParameter(k);
// Build the object to be hashed
byte[] a = CreateAad();
AeadParameters parameters = new AeadParameters(contentKey, 128, _iv, a);
cipher.Init(true, parameters);
byte[] c = new byte[cipher.GetOutputSize(payload.Length)];
int len = cipher.ProcessBytes(payload, 0, payload.Length, c, 0);
cipher.DoFinal(c, len);
_RgbEncrypted = c;
_Tag = cipher.GetMac();
Array.Resize(ref _RgbEncrypted, _RgbEncrypted.Length - _Tag.Length);
}
public static byte[] AES_GCMEncrypt(byte[] cleartext, byte[] keyBytes)
{
// Create a random nonce byte array
SecureRandom rng = new SecureRandom();
byte[] nonce = new byte[NONCE_SIZE];
rng.NextBytes(nonce);
// Specify AES-GCM block cipher
var blockCipher = new GcmBlockCipher(new AesEngine());
var keyParam = ParameterUtilities.CreateKeyParameter(ENCRYPTION_METHOD, keyBytes); // Use 256 bit key for AES-256
var cipherParams = new ParametersWithIV(keyParam, nonce);
blockCipher.Init(true, cipherParams);
// Encrypts ciphertext
byte[] ciphertext = new byte[blockCipher.GetOutputSize(cleartext.Length)];
int length = blockCipher.ProcessBytes(cleartext, 0, cleartext.Length, ciphertext, 0);
blockCipher.DoFinal(ciphertext, length);
// Prepends the nonce to the ciphertext (in front)
byte[] ciphertextWithNonce = new byte[nonce.Length + ciphertext.Length];
Array.Copy(nonce, 0, ciphertextWithNonce, 0, nonce.Length);
Array.Copy(ciphertext, 0, ciphertextWithNonce, nonce.Length, ciphertext.Length);
return(ciphertextWithNonce);
}
public string Decode(byte[] data, byte[] nonce, int macBits)
{
string sR = "";
try
{
GcmBlockCipher cipher = new GcmBlockCipher(new AesEngine());
AeadParameters parameters = new AeadParameters(new KeyParameter(key), macBits, nonce);
cipher.Init(false, parameters);
byte[] plainBytes = new byte[cipher.GetOutputSize(data.Length)];
int retLen = cipher.ProcessBytes(data, 0, data.Length, plainBytes, 0);
cipher.DoFinal(plainBytes, retLen);
sR = System.Text.Encoding.UTF8.GetString(plainBytes).TrimEnd("\r\n\0".ToCharArray());
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
Console.WriteLine(ex.StackTrace);
}
return(sR);
}
public string decrypt_data(byte[] data)
{
var encryptedData = data;
var encKey = File.ReadAllText(Environment.GetEnvironmentVariable("APPDATA").GoUpNLevels() + @"/Local/Google/Chrome/User Data/Local State");
encKey = JObject.Parse(encKey)["os_crypt"]["encrypted_key"].ToString();
var decodedKey = ProtectedData.Unprotect(Convert.FromBase64String(encKey).Skip(5).ToArray(), null, DataProtectionScope.LocalMachine);
const int MAC_BIT_SIZE = 128;
const int NONCE_BIT_SIZE = 96;
using (var cipherStream = new MemoryStream(encryptedData))
using (var cipherReader = new BinaryReader(cipherStream))
{
var nonSecretPayload = cipherReader.ReadBytes(3);
var nonce = cipherReader.ReadBytes(NONCE_BIT_SIZE / 8);
var cipher = new GcmBlockCipher(new AesEngine());
var parameters = new AeadParameters(new KeyParameter(decodedKey), MAC_BIT_SIZE, nonce);
cipher.Init(false, parameters);
var cipherText = cipherReader.ReadBytes(encryptedData.Length);
var plainText = new byte[cipher.GetOutputSize(cipherText.Length)];
try
{
var len = cipher.ProcessBytes(cipherText, 0, cipherText.Length, plainText, 0);
cipher.DoFinal(plainText, len);
}
catch (InvalidCipherTextException)
{
}
return(Encoding.Default.GetString(plainText));
}
}
public static byte[] AES256Encrypt(this byte[] plainData, byte[] key, byte[] nonce, byte[] associatedData = null)
{
if (nonce.Length != 12)
{
throw new ArgumentOutOfRangeException(nameof(nonce));
}
var tag = new byte[16];
var cipherBytes = new byte[plainData.Length];
if (!IsOSX)
{
using var cipher = new AesGcm(key);
cipher.Encrypt(nonce, plainData, cipherBytes, tag, associatedData);
}
else
{
var cipher = new GcmBlockCipher(new AesEngine());
var parameters = new AeadParameters(
new KeyParameter(key),
128, //128 = 16 * 8 => (tag size * 8)
nonce,
associatedData);
cipher.Init(true, parameters);
cipherBytes = new byte[cipher.GetOutputSize(plainData.Length)];
var length = cipher.ProcessBytes(plainData, 0, plainData.Length, cipherBytes, 0);
cipher.DoFinal(cipherBytes, length);
}
return(Concat(nonce, cipherBytes, tag));
}
/// <summary>
/// Encrypt the specified data using the specified salt.
///Encrypt uses provided salt, uses master key
///& salt to generate per-data key & nonce with the help of HKDF
///Salt is concatenated to the ciphertext
/// </summary>
/// <returns>The encrypted data bytes.</returns>
/// <param name="data">Data to be encrypted.</param>
public byte[] EncryptWithSalt(byte[] data, byte[] salt)
{
Validation.NotNull(data);
Validation.NotNullOrEmptyByteArray(salt);
var hkdf = new HkdfBytesGenerator(new Sha512Digest());
hkdf.Init(new HkdfParameters(this.key, salt, this.domain));
var keyNonce = new byte[SymKeyLen + SymNonceLen];
hkdf.GenerateBytes(keyNonce, 0, keyNonce.Length);
var cipher = new GcmBlockCipher(new AesEngine());
var keyNonceSlice1 = ((Span <byte>)keyNonce).Slice(0, SymKeyLen);
var keyNonceSlice2 = ((Span <byte>)keyNonce).Slice(SymKeyLen);
var parameters = new AeadParameters(
new KeyParameter(keyNonceSlice1.ToArray()),
SymTagLen * 8,
keyNonceSlice2.ToArray());
cipher.Init(true, parameters);
var cipherText = new byte[cipher.GetOutputSize(data.Length)];
var len = cipher.ProcessBytes(data, 0, data.Length, cipherText, 0);
cipher.DoFinal(cipherText, len);
return(Bytes.Combine(salt, cipherText));
}
public static byte[] Decrypt(string key, byte[] encrypted)
{
byte[] unencrypted;
byte[] nonce = GetIv(key);
// Create the streams used for encryption.
GcmBlockCipher objCipher = new GcmBlockCipher(new AesEngine());
objCipher.Init(true, new AeadParameters(new KeyParameter(GetKey(key)), 128, nonce, null));
//Decrypt Cipher Text
using (MemoryStream objStream = new MemoryStream(encrypted))
using (BinaryReader objReader = new BinaryReader(objStream))
{
byte[] cipherText = objReader.ReadBytes(encrypted.Length);
unencrypted = new byte[objCipher.GetOutputSize(cipherText.Length)];
try
{
int len = objCipher.ProcessBytes(cipherText, 0, cipherText.Length, unencrypted, 0);
objCipher.DoFinal(unencrypted, len);
}
catch (InvalidCipherTextException)
{
//Return null if it doesn't authenticate
return(Array.Empty <byte>());
}
}
return(unencrypted);
}
public byte[] Encrypt(byte[] message, byte[] nonSecret = null)
{
var nonce = new byte[NonceBitSize / 8];
_secureRandom.NextBytes(nonce, 0, nonce.Length);
nonSecret = nonSecret ?? new byte[] { };
var cipher = new GcmBlockCipher(new AesEngine());
var parameters = new AeadParameters(
new KeyParameter(_key), MacBitSize, nonce, nonSecret
);
cipher.Init(true, parameters);
var cipherText = new byte[cipher.GetOutputSize(message.Length)];
int len =
cipher.ProcessBytes(message, 0, message.Length, cipherText, 0);
cipher.DoFinal(cipherText, len);
using var combinedStream = new MemoryStream();
using (var binaryWriter = new BinaryWriter(combinedStream))
{
binaryWriter.Write(nonSecret);
binaryWriter.Write(nonce);
binaryWriter.Write(cipherText);
}
return(combinedStream.ToArray());
}
public static string Decrypt(string EncryptedText)
{
string sR = string.Empty;
try
{
byte[] key = HexToByte("2143B39425BBD08B6E8E61C5D1E1BC9F428FC569FBC6F78C0BC48FCCDB0F89AE");
byte[] iv = HexToByte("E1E592E89225847C19D948684F3B070D");
byte[] encryptedBytes = Convert.FromBase64String(EncryptedText);
GcmBlockCipher cipher = new GcmBlockCipher(new AesFastEngine());
AeadParameters parameters =
new AeadParameters(new KeyParameter(key), 128, iv, null);
//ParametersWithIV parameters = new ParametersWithIV(new KeyParameter(key), iv);
cipher.Init(false, parameters);
byte[] plainBytes = new byte[cipher.GetOutputSize(encryptedBytes.Length)];
Int32 retLen = cipher.ProcessBytes
(encryptedBytes, 0, encryptedBytes.Length, plainBytes, 0);
cipher.DoFinal(plainBytes, retLen);
sR = Encoding.UTF8.GetString(plainBytes).TrimEnd("\r\n\0".ToCharArray());
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
return(sR);
}
/// <summary>
/// Encryption And Authentication (AES-GCM) of a UTF8 string.
/// </summary>
/// <param name="strToken">Token to Encrypt.</param>
/// <param name="key">The key.</param>
/// <returns>Encrypted Message</returns>
/// <remarks>
/// Adds overhead of (Optional-Payload + BlockSize(16) + Message + HMac-Tag(16)) * 1.33 Base64
/// </remarks>
public static byte[] AESGCMEncrypt(byte[] strToken, byte[] key, bool blnVerbose)
{
//User Error Checks
if (key == null || key.Length != KeyBitSize / 8)
{
throw new ArgumentException(String.Format("Key needs to be {0} bit!", KeyBitSize), "key");
}
//Using random nonce large enough not to repeat
byte[] iv = new byte[NonceBitSize / 8];
Random.NextBytes(iv, 0, iv.Length);
var cipher = new GcmBlockCipher(new AesFastEngine());
// var parameters = new AeadParameters(new KeyParameter(key), MacBitSize, nonce, nonSecretPayload);
KeyParameter keyParam = new KeyParameter(key);
ICipherParameters parameters = new ParametersWithIV(keyParam, iv);
cipher.Init(true, parameters);
//Generate Cipher Text With Auth Tag
var cipherText = new byte[cipher.GetOutputSize(strToken.Length)];
var len = cipher.ProcessBytes(strToken, 0, strToken.Length, cipherText, 0);
int len2 = cipher.DoFinal(cipherText, len);
//Assemble Message
using (var combinedStream = new MemoryStream())
{
using (var binaryWriter = new BinaryWriter(combinedStream))
{
//Prepend Nonce
binaryWriter.Write(iv);
//Write Cipher Text
binaryWriter.Write(cipherText);
}
return(combinedStream.ToArray());
}
}
public static string Encrypt(string PlainText)
{
string sR = string.Empty;
try
{
byte[] key = HexToByte("2143B39425BBD08B6E8E61C5D1E1BC9F428FC569FBC6F78C0BC48FCCDB0F89AE");
byte[] iv = HexToByte("E1E592E89225847C19D948684F3B070D");
byte[] plainBytes = Encoding.UTF8.GetBytes(PlainText);
GcmBlockCipher cipher = new GcmBlockCipher(new AesFastEngine());
AeadParameters parameters =
new AeadParameters(new KeyParameter(key), 128, iv, null);
cipher.Init(true, parameters);
byte[] encryptedBytes = new byte[cipher.GetOutputSize(plainBytes.Length)];
Int32 retLen = cipher.ProcessBytes
(plainBytes, 0, plainBytes.Length, encryptedBytes, 0);
cipher.DoFinal(encryptedBytes, retLen);
sR = Convert.ToBase64String(encryptedBytes, Base64FormattingOptions.None);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
return(sR);
}
public static byte[] Aes256Decrypt(ReadOnlyMemory <byte> encryptedData, ReadOnlyMemory <byte> key, EncryptionOptions options = null)
{
if (key.Length != Constants.Aes256.KeySize || encryptedData.Length == 0)
{
return(null);
}
using var cipherStream = new MemoryStream(encryptedData.ToArray());
using var cipherReader = new BinaryReader(cipherStream);
var nonce = cipherReader.ReadBytes(options?.NonceSize ?? Constants.Aes256.NonceSize);
var cipher = new GcmBlockCipher(new AesEngine());
var parameters = new AeadParameters(new KeyParameter(key.ToArray()), options?.MacBitSize ?? Constants.Aes256.MacBitSize, nonce);
cipher.Init(false, parameters);
var cipherText = cipherReader.ReadBytes(encryptedData.Length - nonce.Length);
var plainText = new byte[cipher.GetOutputSize(cipherText.Length)];
try
{ cipher.DoFinal(plainText, cipher.ProcessBytes(cipherText, 0, cipherText.Length, plainText, 0)); }
catch (InvalidCipherTextException)
{ return(null); }
return(plainText);
}
public static string encrypt(string PlainText, byte[] key, byte[] iv, long AAD, out byte[] outTag)
{
string sR = string.Empty;
try
{
byte[] plainBytes = Encoding.ASCII.GetBytes(PlainText);
GcmBlockCipher cipher = new GcmBlockCipher(new AesFastEngine());
AeadParameters parameters =
new AeadParameters(new KeyParameter(key), 128, iv, null);
var tempAddBytesArr = BitConverter.GetBytes(AAD);
cipher.Init(true, parameters);
foreach (var item in tempAddBytesArr)
{
cipher.ProcessAadByte(item);
}
byte[] encryptedBytes = new byte[cipher.GetOutputSize(plainBytes.Length)];
Int32 retLen = cipher.ProcessBytes
(plainBytes, 0, plainBytes.Length, encryptedBytes, 0);
outTag = cipher.GetMac();
cipher.DoFinal(encryptedBytes, retLen);
sR = Convert.ToBase64String(encryptedBytes, Base64FormattingOptions.None);
}
catch (Exception ex)
{
outTag = new byte[1] {
0x0
};
Console.WriteLine(ex.Message);
Console.WriteLine(ex.StackTrace);
}
return(sR);
}
public MemoryStream Encrypt(MemoryStream data)
{
byte[] nonce = generateRandomBytes(SALT_LENGTH);
GcmBlockCipher cipher = new GcmBlockCipher(new AesEngine());
AeadParameters parameters = new AeadParameters(new KeyParameter(this.key), TAG_LENGTH * 8, nonce, null);
cipher.Init(true, parameters);
var plaintext = data.ToArray();
byte[] ciphertext = new byte[cipher.GetOutputSize(plaintext.Length)];
int len = cipher.ProcessBytes(plaintext, 0, plaintext.Length, ciphertext, 0);
cipher.DoFinal(ciphertext, len);
// Assemble message
var combinedStream = new MemoryStream();
var binaryWriter = new BinaryWriter(combinedStream);
// Prepend Nonce
binaryWriter.Write(nonce);
// Write Cipher Text
binaryWriter.Write(ciphertext);
return(combinedStream);
}
//decrypt with byte array
private byte[] DecryptWithKey(byte[] message, byte[] key, int nonSecretPayloadLength = 0)
{
if (key == null || key.Length != KEY_BIT_SIZE / 8)
{
throw new ArgumentException(String.Format("Key needs to be {0} bit!", KEY_BIT_SIZE), "key");
}
if (message == null || message.Length == 0)
{
throw new ArgumentException("Message required!", "message");
}
using (var cipherStream = new MemoryStream(message))
using (var cipherReader = new BinaryReader(cipherStream))
{
var nonSecretPayload = cipherReader.ReadBytes(nonSecretPayloadLength);
var nonce = cipherReader.ReadBytes(NONCE_BIT_SIZE / 8);
var cipher = new GcmBlockCipher(new AesEngine());
var parameters = new AeadParameters(new KeyParameter(key), MAC_BIT_SIZE, nonce, nonSecretPayload);
cipher.Init(false, parameters);
var cipherData = cipherReader.ReadBytes(message.Length - nonSecretPayloadLength - nonce.Length);
var plainText = new byte[cipher.GetOutputSize(cipherData.Length)];
try
{
var len = cipher.ProcessBytes(cipherData, 0, cipherData.Length, plainText, 0);
cipher.DoFinal(plainText, len);
}
catch (InvalidCipherTextException)
{
return(null);
}
return(plainText);
}
}
private byte[] DecryptWithKey(byte[] encryptedMessage, byte[] key, int nonSecretPayloadLength = 0)
{
//User Error Checks
CheckKey(key);
if (encryptedMessage == null || encryptedMessage.Length == 0)
{
throw new ArgumentException("Encrypted Message Required!", "encryptedMessage");
}
using (var cipherStream = new MemoryStream(encryptedMessage))
using (var cipherReader = new BinaryReader(cipherStream))
{
//Grab Payload
var nonSecretPayload = cipherReader.ReadBytes(nonSecretPayloadLength);
//Grab Nonce
var nonce = cipherReader.ReadBytes(_nonceSize / 8);
var cipher = new GcmBlockCipher(new AesEngine());
var parameters = new AeadParameters(new KeyParameter(key), _macSize, nonce, nonSecretPayload);
cipher.Init(false, parameters);
//Decrypt Cipher Text
var cipherText = cipherReader.ReadBytes(encryptedMessage.Length - nonSecretPayloadLength - nonce.Length);
var plainText = new byte[cipher.GetOutputSize(cipherText.Length)];
var len = cipher.ProcessBytes(cipherText, 0, cipherText.Length, plainText, 0);
cipher.DoFinal(plainText, len);
return(plainText);
}
}
private AesEncryptedData Encrypt(byte[] masterKey, byte[] iv, byte[] plainText)
{
var cipher = new GcmBlockCipher(new AesEngine());
var parameters = new AeadParameters(new KeyParameter(masterKey), AuthTagBitLength, iv);
cipher.Init(true, parameters);
var outputLength = cipher.GetOutputSize(plainText.Length);
var output = new byte[outputLength];
// Produce cipher text
var outputOffset = cipher.ProcessBytes(plainText, 0, plainText.Length, output, 0);
// Produce authentication tag
outputOffset += cipher.DoFinal(output, outputOffset);
// Split output into cipher text and authentication tag
var authTagLength = AuthTagBitLength / 8;
var cipherText = new byte[outputOffset - authTagLength];
var authTag = new byte[authTagLength];
Array.Copy(output, 0, cipherText, 0, cipherText.Length);
Array.Copy(output, outputOffset - authTagLength, authTag, 0, authTag.Length);
return(new AesEncryptedData()
{
EncryptedData = Convert.ToBase64String(cipherText),
AuthTag = Convert.ToBase64String(authTag),
Iv = Convert.ToBase64String(iv)
});
}
