public static byte[] Decrypt(byte[] key, byte[] iv, byte[] aad, byte[] cipherText, byte[] authTag)
{
IntPtr intPtr;
byte[] numArray;
IntPtr intPtr1 = AesGcm.OpenAlgorithmProvider(BCrypt.BCRYPT_AES_ALGORITHM, BCrypt.MS_PRIMITIVE_PROVIDER, BCrypt.BCRYPT_CHAIN_MODE_GCM);
IntPtr intPtr2 = AesGcm.ImportKey(intPtr1, key, out intPtr);
BCrypt.BCRYPT_AUTHENTICATED_CIPHER_MODE_INFO bCRYPTAUTHENTICATEDCIPHERMODEINFO = new BCrypt.BCRYPT_AUTHENTICATED_CIPHER_MODE_INFO(iv, aad, authTag);
BCrypt.BCRYPT_AUTHENTICATED_CIPHER_MODE_INFO bCRYPTAUTHENTICATEDCIPHERMODEINFO1 = bCRYPTAUTHENTICATEDCIPHERMODEINFO;
try
{
byte[] numArray1 = new byte[AesGcm.MaxAuthTagSize(intPtr1)];
int num = 0;
uint num1 = BCrypt.BCryptDecrypt(intPtr, cipherText, (int)cipherText.Length, ref bCRYPTAUTHENTICATEDCIPHERMODEINFO, numArray1, (int)numArray1.Length, null, 0, ref num, 0);
if (num1 != 0)
{
throw new CryptographicException(string.Format("BCrypt.BCryptDecrypt() (get size) failed with status code: {0}", num1));
}
numArray = new byte[num];
num1 = BCrypt.BCryptDecrypt(intPtr, cipherText, (int)cipherText.Length, ref bCRYPTAUTHENTICATEDCIPHERMODEINFO, numArray1, (int)numArray1.Length, numArray, (int)numArray.Length, ref num, 0);
if (num1 == BCrypt.STATUS_AUTH_TAG_MISMATCH)
{
throw new CryptographicException("BCrypt.BCryptDecrypt(): authentication tag mismatch");
}
if (num1 != 0)
{
throw new CryptographicException(string.Format("BCrypt.BCryptDecrypt() failed with status code:{0}", num1));
}
}
finally
{
((IDisposable)bCRYPTAUTHENTICATEDCIPHERMODEINFO1).Dispose();
}
BCrypt.BCryptDestroyKey(intPtr);
Marshal.FreeHGlobal(intPtr2);
BCrypt.BCryptCloseAlgorithmProvider(intPtr1, 0);
return(numArray);
}
public static byte[][] Encrypt(byte[] key, byte[] iv, byte[] aad, byte[] plainText)
{
IntPtr intPtr;
byte[] numArray;
IntPtr intPtr1 = AesGcm.OpenAlgorithmProvider(BCrypt.BCRYPT_AES_ALGORITHM, BCrypt.MS_PRIMITIVE_PROVIDER, BCrypt.BCRYPT_CHAIN_MODE_GCM);
IntPtr intPtr2 = AesGcm.ImportKey(intPtr1, key, out intPtr);
byte[] numArray1 = new byte[AesGcm.MaxAuthTagSize(intPtr1)];
BCrypt.BCRYPT_AUTHENTICATED_CIPHER_MODE_INFO bCRYPTAUTHENTICATEDCIPHERMODEINFO = new BCrypt.BCRYPT_AUTHENTICATED_CIPHER_MODE_INFO(iv, aad, numArray1);
BCrypt.BCRYPT_AUTHENTICATED_CIPHER_MODE_INFO bCRYPTAUTHENTICATEDCIPHERMODEINFO1 = bCRYPTAUTHENTICATEDCIPHERMODEINFO;
try
{
byte[] numArray2 = new byte[(int)numArray1.Length];
int num = 0;
uint num1 = BCrypt.BCryptEncrypt(intPtr, plainText, (int)plainText.Length, ref bCRYPTAUTHENTICATEDCIPHERMODEINFO, numArray2, (int)numArray2.Length, null, 0, ref num, 0);
if (num1 != 0)
{
throw new CryptographicException(string.Format("BCrypt.BCryptEncrypt() (get size) failed with status code:{0}", num1));
}
numArray = new byte[num];
num1 = BCrypt.BCryptEncrypt(intPtr, plainText, (int)plainText.Length, ref bCRYPTAUTHENTICATEDCIPHERMODEINFO, numArray2, (int)numArray2.Length, numArray, (int)numArray.Length, ref num, 0);
if (num1 != 0)
{
throw new CryptographicException(string.Format("BCrypt.BCryptEncrypt() failed with status code:{0}", num1));
}
Marshal.Copy(bCRYPTAUTHENTICATEDCIPHERMODEINFO.pbTag, numArray1, 0, bCRYPTAUTHENTICATEDCIPHERMODEINFO.cbTag);
}
finally
{
((IDisposable)bCRYPTAUTHENTICATEDCIPHERMODEINFO1).Dispose();
}
BCrypt.BCryptDestroyKey(intPtr);
Marshal.FreeHGlobal(intPtr2);
BCrypt.BCryptCloseAlgorithmProvider(intPtr1, 0);
return(new byte[][] { numArray, numArray1 });
}