// 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);