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privatekey, rsa decryption, org key management

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This commit is contained in:
Kyle Spearrin 2017-04-20 00:06:11 -04:00
parent e7f3b115a4
commit 498379bb7e
2 changed files with 140 additions and 48 deletions
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3
src/App/Models/CipherString.cs
View File

@ -97,7 +97,8 @@ namespace Bit.App.Models
public string InitializationVector { get; private set; }
public string CipherText { get; private set; }
public string Mac { get; private set; }
public byte[] InitializationVectorBytes => Convert.FromBase64String(InitializationVector);
public byte[] InitializationVectorBytes => InitializationVector == null ?
null : Convert.FromBase64String(InitializationVector);
public byte[] CipherTextBytes => Convert.FromBase64String(CipherText);
public byte[] MacBytes => Mac == null ? null : Convert.FromBase64String(Mac);

185
src/App/Services/CryptoService.cs
View File

@ -5,6 +5,8 @@ using Bit.App.Abstractions;
using Bit.App.Models;
using PCLCrypto;
using System.Linq;
using Bit.App.Enums;
using System.Collections.Generic;
namespace Bit.App.Services
{
@ -12,6 +14,8 @@ namespace Bit.App.Services
{
private const string KeyKey = "key";
private const string PreviousKeyKey = "previousKey";
private const string PrivateKeyKey = "privateKey";
private const string OrgKeyKeyPrefix = "orgKey:";
private const int InitializationVectorSize = 16;
private readonly ISecureStorageService _secureStorage;
@ -19,6 +23,8 @@ namespace Bit.App.Services
private CryptoKey _key;
private CryptoKey _legacyEtmKey;
private CryptoKey _previousKey;
private IDictionary<Guid, CryptoKey> _orgKeys = new Dictionary<Guid, CryptoKey>();
private byte[] _privateKey;
public CryptoService(
ISecureStorageService secureStorage,
@ -94,6 +100,62 @@ namespace Bit.App.Services
}
}
public byte[] PrivateKey
{
get
{
if(_privateKey == null)
{
_privateKey = _secureStorage.Retrieve(PrivateKeyKey);
}
return _privateKey;
}
private set
{
if(value != null)
{
_secureStorage.Store(PrivateKeyKey, value);
_privateKey = value;
}
}
}
public void SetPrivateKey(CipherString privateKeyEnc, CryptoKey key)
{
var bytes = DecryptToBytes(privateKeyEnc, key);
PrivateKey = bytes;
}
public CryptoKey GetOrgKey(Guid orgId)
{
if(!_orgKeys.ContainsKey(orgId))
{
var key = string.Concat(OrgKeyKeyPrefix, orgId);
if(!_secureStorage.Contains(key))
{
return null;
}
_orgKeys[orgId] = new CryptoKey(_secureStorage.Retrieve(key));
}
return _orgKeys[orgId];
}
public void AddOrgKey(Guid orgId, CipherString encOrgKey, byte[] privateKey)
{
try
{
var decBytes = RsaDecryptToBytes(encOrgKey, privateKey);
_orgKeys[orgId] = new CryptoKey(decBytes);
}
catch
{
Debug.WriteLine("Cannot set org key. Decryption failed.");
}
}
public CipherString Encrypt(string plaintextValue, CryptoKey key = null)
{
if(key == null)
@ -126,53 +188,8 @@ namespace Bit.App.Services
{
try
{
if(key == null)
{
key = Key;
}
if(key == null)
{
throw new ArgumentNullException(nameof(key));
}
if(encyptedValue == null)
{
throw new ArgumentNullException(nameof(encyptedValue));
}
if(encyptedValue.EncryptionType == Enums.EncryptionType.AesCbc128_HmacSha256_B64 &&
key.EncryptionType == Enums.EncryptionType.AesCbc256_B64)
{
// Old encrypt-then-mac scheme, swap out the key
if(_legacyEtmKey == null)
{
_legacyEtmKey = new CryptoKey(key.Key, Enums.EncryptionType.AesCbc128_HmacSha256_B64);
}
key = _legacyEtmKey;
}
if(encyptedValue.EncryptionType != key.EncryptionType)
{
throw new ArgumentException("encType unavailable.");
}
if(key.MacKey != null && !string.IsNullOrWhiteSpace(encyptedValue.Mac))
{
var computedMac = ComputeMac(encyptedValue.CipherTextBytes,
encyptedValue.InitializationVectorBytes, key.MacKey);
if(computedMac != encyptedValue.Mac)
{
throw new InvalidOperationException("MAC failed.");
}
}
var provider = WinRTCrypto.SymmetricKeyAlgorithmProvider.OpenAlgorithm(SymmetricAlgorithm.AesCbcPkcs7);
var cryptoKey = provider.CreateSymmetricKey(key.EncKey);
var decryptedBytes = WinRTCrypto.CryptographicEngine.Decrypt(cryptoKey, encyptedValue.CipherTextBytes,
encyptedValue.InitializationVectorBytes);
return Encoding.UTF8.GetString(decryptedBytes, 0, decryptedBytes.Length).TrimEnd('\0');
var bytes = DecryptToBytes(encyptedValue, key);
return Encoding.UTF8.GetString(bytes, 0, bytes.Length).TrimEnd('\0');
}
catch(Exception e)
{
@ -181,6 +198,80 @@ namespace Bit.App.Services
}
}
public byte[] DecryptToBytes(CipherString encyptedValue, CryptoKey key = null)
{
if(key == null)
{
key = Key;
}
if(key == null)
{
throw new ArgumentNullException(nameof(key));
}
if(encyptedValue == null)
{
throw new ArgumentNullException(nameof(encyptedValue));
}
if(encyptedValue.EncryptionType == Enums.EncryptionType.AesCbc128_HmacSha256_B64 &&
key.EncryptionType == Enums.EncryptionType.AesCbc256_B64)
{
// Old encrypt-then-mac scheme, swap out the key
if(_legacyEtmKey == null)
{
_legacyEtmKey = new CryptoKey(key.Key, Enums.EncryptionType.AesCbc128_HmacSha256_B64);
}
key = _legacyEtmKey;
}
if(encyptedValue.EncryptionType != key.EncryptionType)
{
throw new ArgumentException("encType unavailable.");
}
if(key.MacKey != null && !string.IsNullOrWhiteSpace(encyptedValue.Mac))
{
var computedMac = ComputeMac(encyptedValue.CipherTextBytes,
encyptedValue.InitializationVectorBytes, key.MacKey);
if(computedMac != encyptedValue.Mac)
{
throw new InvalidOperationException("MAC failed.");
}
}
var provider = WinRTCrypto.SymmetricKeyAlgorithmProvider.OpenAlgorithm(SymmetricAlgorithm.AesCbcPkcs7);
var cryptoKey = provider.CreateSymmetricKey(key.EncKey);
var decryptedBytes = WinRTCrypto.CryptographicEngine.Decrypt(cryptoKey, encyptedValue.CipherTextBytes,
encyptedValue.InitializationVectorBytes);
return decryptedBytes;
}
public byte[] RsaDecryptToBytes(CipherString encyptedValue, byte[] privateKey)
{
if(privateKey == null)
{
privateKey = PrivateKey;
}
if(privateKey == null)
{
throw new ArgumentNullException(nameof(privateKey));
}
if(encyptedValue.EncryptionType != EncryptionType.RsaOaep_Sha256_B64)
{
throw new ArgumentException("encType unavailable.");
}
var provider = WinRTCrypto.AsymmetricKeyAlgorithmProvider.OpenAlgorithm(AsymmetricAlgorithm.RsaOaepSha256);
var cryptoKey = provider.ImportKeyPair(privateKey, CryptographicPrivateKeyBlobType.Pkcs8RawPrivateKeyInfo);
var decryptedBytes = WinRTCrypto.CryptographicEngine.Decrypt(cryptoKey, encyptedValue.CipherTextBytes);
return decryptedBytes;
}
private string ComputeMac(byte[] ctBytes, byte[] ivBytes, byte[] macKey)
{
if(macKey == null)