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Code Issues Releases Wiki Activity

download, decrypt and open attachment files

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This commit is contained in:
Kyle Spearrin
2017-07-12 23:09:44 -04:00
parent 0a7ad44d23
commit ac3fdbc2cd
26 changed files with 285 additions and 71 deletions
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44
src/App/Utilities/Crypto.cs
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@@ -1,4 +1,5 @@
using Bit.App.Models;
using Bit.App.Enums;
using Bit.App.Models;
using PCLCrypto;
using System;
using System.Collections.Generic;
@@ -32,21 +33,41 @@ namespace Bit.App.Utilities
public static byte[] AesCbcDecrypt(CipherString encyptedValue, SymmetricCryptoKey key)
{
if(key == null)
{
throw new ArgumentNullException(nameof(key));
}
if(encyptedValue == null)
{
throw new ArgumentNullException(nameof(encyptedValue));
}
if(key.MacKey != null && !string.IsNullOrWhiteSpace(encyptedValue.Mac))
return AesCbcDecrypt(encyptedValue.EncryptionType, encyptedValue.CipherTextBytes,
encyptedValue.InitializationVectorBytes, encyptedValue.MacBytes, key);
}
public static byte[] AesCbcDecrypt(EncryptionType type, byte[] ct, byte[] iv, byte[] mac, SymmetricCryptoKey key)
{
if(key == null)
{
var computedMacBytes = ComputeMac(encyptedValue.CipherTextBytes,
encyptedValue.InitializationVectorBytes, key.MacKey);
if(!MacsEqual(key.MacKey, computedMacBytes, encyptedValue.MacBytes))
throw new ArgumentNullException(nameof(key));
}
if(ct == null)
{
throw new ArgumentNullException(nameof(ct));
}
if(iv == null)
{
throw new ArgumentNullException(nameof(iv));
}
if(key.EncryptionType != type)
{
throw new InvalidOperationException(nameof(type));
}
if(key.MacKey != null && mac != null)
{
var computedMacBytes = ComputeMac(ct, iv, key.MacKey);
if(!MacsEqual(key.MacKey, computedMacBytes, mac))
{
throw new InvalidOperationException("MAC failed.");
}
@@ -54,8 +75,7 @@ namespace Bit.App.Utilities
var provider = WinRTCrypto.SymmetricKeyAlgorithmProvider.OpenAlgorithm(SymmetricAlgorithm.AesCbcPkcs7);
var cryptoKey = provider.CreateSymmetricKey(key.EncKey);
var decryptedBytes = WinRTCrypto.CryptographicEngine.Decrypt(cryptoKey, encyptedValue.CipherTextBytes,
encyptedValue.InitializationVectorBytes);
var decryptedBytes = WinRTCrypto.CryptographicEngine.Decrypt(cryptoKey, ct, iv);
return decryptedBytes;
}