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cryptographically secure RNG for password generator

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This commit is contained in:
Kyle Spearrin 2016-10-15 01:18:12 -04:00
parent 8f1a8e3ce9
commit fc1b825f46
1 changed files with 13 additions and 3 deletions
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16
src/App/Services/PasswordGenerationService.cs
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@ -4,13 +4,13 @@ using System.Linq;
using System.Text; using System.Text;
using Bit.App.Abstractions; using Bit.App.Abstractions;
using Plugin.Settings.Abstractions; using Plugin.Settings.Abstractions;
using PCLCrypto;
namespace Bit.App.Services namespace Bit.App.Services
{ {
public class PasswordGenerationService : IPasswordGenerationService public class PasswordGenerationService : IPasswordGenerationService
{ {
private readonly ISettings _settings; private readonly ISettings _settings;
private Random _random = new Random();
public PasswordGenerationService(ISettings settings) public PasswordGenerationService(ISettings settings)
{ {
@ -104,7 +104,7 @@ namespace Bit.App.Services
} }
// Shuffle // Shuffle
var positions = positionsBuilder.ToString().ToCharArray().OrderBy(a => _random.Next()).ToArray(); var positions = positionsBuilder.ToString().ToCharArray().OrderBy(a => Next(int.MaxValue)).ToArray();
// Build out other character sets // Build out other character sets
var allCharSet = string.Empty; var allCharSet = string.Empty;
@ -168,11 +168,21 @@ namespace Bit.App.Services
break; break;
} }
var randomCharIndex = _random.Next(0, positionChars.Length - 1); var randomCharIndex = Next(positionChars.Length - 1);
password.Append(positionChars[randomCharIndex]); password.Append(positionChars[randomCharIndex]);
} }
return password.ToString(); return password.ToString();
} }
private int Next(int maxValue)
{
if(maxValue == 0)
{
return 0;
}
return (int)(WinRTCrypto.CryptographicBuffer.GenerateRandomNumber() % maxValue);
}
} }
} }