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Code Issues Releases Wiki Activity

[PM-2297] Add DecryptUserKeyWithDeviceKey method

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This commit is contained in:
André Bispo
2023-07-13 15:41:08 +01:00
parent b688b85d0f
commit e9ac1e3b5b
2 changed files with 24 additions and 0 deletions
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1
src/Core/Abstractions/IDeviceTrustCryptoService.cs
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@@ -10,5 +10,6 @@ namespace Bit.Core.Abstractions
Task<DeviceResponse> TrustDeviceIfNeededAsync();
Task<bool> GetShouldTrustDeviceAsync();
Task SetShouldTrustDeviceAsync(bool value);
Task<SymmetricCryptoKey> DecryptUserKeyWithDeviceKey(string encryptedDevicePrivateKey, string encryptedUserKey);
}
}

23
src/Core/Services/DeviceTrustCryptoService.cs
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@@ -99,5 +99,28 @@ namespace Bit.Core.Services
await SetShouldTrustDeviceAsync(false);
return response;
}
// TODO: Add proper types to parameters once we have them coming down from server
public async Task<SymmetricCryptoKey> DecryptUserKeyWithDeviceKey(string encryptedDevicePrivateKey, string encryptedUserKey)
{
// Get device key
var existingDeviceKey = await GetDeviceKeyAsync();
if (existingDeviceKey == null)
{
// User doesn't have a device key anymore so device is untrusted
return null;
}
// Attempt to decrypt encryptedDevicePrivateKey with device key
var devicePrivateKey = await _cryptoService.DecryptToBytesAsync(
new EncString(encryptedDevicePrivateKey),
existingDeviceKey
);
// Attempt to decrypt encryptedUserDataKey with devicePrivateKey
var userKey = await _cryptoService.RsaDecryptAsync(encryptedUserKey, devicePrivateKey);
return new SymmetricCryptoKey(userKey);
}
}
}