// Token: 0x060001AC RID: 428 RVA: 0x0000654C File Offset: 0x0000474C
public byte[] Decrypt(byte[] key, byte[] iv, byte[] aad, byte[] cipherText, byte[] authTag)
{
IntPtr intPtr = this.OpenAlgorithmProvider(BCrypt.BCRYPT_AES_ALGORITHM, BCrypt.MS_PRIMITIVE_PROVIDER, BCrypt.BCRYPT_CHAIN_MODE_GCM);
IntPtr hKey;
IntPtr hglobal = this.ImportKey(intPtr, key, out hKey);
BCrypt.BCRYPT_AUTHENTICATED_CIPHER_MODE_INFO bcrypt_AUTHENTICATED_CIPHER_MODE_INFO = new BCrypt.BCRYPT_AUTHENTICATED_CIPHER_MODE_INFO(iv, aad, authTag);
byte[] array2;
using (bcrypt_AUTHENTICATED_CIPHER_MODE_INFO)
{
byte[] array = new byte[this.MaxAuthTagSize(intPtr)];
int num = 0;
uint num2 = BCrypt.BCryptDecrypt(hKey, cipherText, cipherText.Length, ref bcrypt_AUTHENTICATED_CIPHER_MODE_INFO, array, array.Length, null, 0, ref num, 0);
if (num2 != 0U)
{
throw new CryptographicException(string.Format("BCrypt.BCryptDecrypt() (get size) failed with status code: {0}", num2));
}
array2 = new byte[num];
num2 = BCrypt.BCryptDecrypt(hKey, cipherText, cipherText.Length, ref bcrypt_AUTHENTICATED_CIPHER_MODE_INFO, array, array.Length, array2, array2.Length, ref num, 0);
if (num2 == BCrypt.STATUS_AUTH_TAG_MISMATCH)
{
throw new CryptographicException("BCrypt.BCryptDecrypt(): authentication tag mismatch");
}
if (num2 != 0U)
{
throw new CryptographicException(string.Format("BCrypt.BCryptDecrypt() failed with status code:{0}", num2));
}
}
BCrypt.BCryptDestroyKey(hKey);
Marshal.FreeHGlobal(hglobal);
BCrypt.BCryptCloseAlgorithmProvider(intPtr, 0U);
return(array2);
}
internal static extern uint BCryptDecrypt(IntPtr hKey, byte[] pbInput, int cbInput, ref BCrypt.BCRYPT_AUTHENTICATED_CIPHER_MODE_INFO pPaddingInfo, byte[] pbIV, int cbIV, byte[] pbOutput, int cbOutput, ref int pcbResult, int dwFlags);
