/// <summary>
/// loads the file and hydrates the cipher pair. expects a json serialized value
/// </summary>
private void Load()
{
var secureData = this.LockedFile.Read();
var data = SecureStringUtil.ToInsecureString(secureData);
this.Pair = JsonSerializer.DeserializeFromString<SymmetricCipherPair>(data);
Condition.Requires(this.Pair).IsNotNull();
}
public static CipherPairFile CreateRandomKeyFile(string filePath)
{
var cp = SymmetricCipherPair.AutogenerateRijndael();
CipherPairFile kf = new CipherPairFile(filePath, cp);
kf = new CipherPairFile(filePath);
return(kf);
}
/// <summary>
/// loads the file and hydrates the cipher pair. expects a json serialized value
/// </summary>
private void Load()
{
var secureData = this.LockedFile.Read();
var data = SecureStringUtil.ToInsecureString(secureData);
this.Pair = JsonSerializer.DeserializeFromString <SymmetricCipherPair>(data);
Condition.Requires(this.Pair).IsNotNull();
}
/// <summary>
/// this will write the cipher pair (json serialized) to file
/// </summary>
/// <param name="filePath"></param>
public CipherPairFile(string filePath, SymmetricCipherPair pair)
: base()
{
Condition.Requires(pair).IsNotNull();
this.LockedFile = new LockedFile(filePath);
this.Save();
}
public KeyChainItem(string id, SymmetricCipherPair keyAndEntropy)
{
Condition.Requires(id).IsNotNullOrEmpty();
Condition.Requires(keyAndEntropy).IsNotNull();
this.Id = id;
this.KeyAndEntropy = keyAndEntropy;
}
/// <summary>
/// generates a new key of the provided size, and stores it at the given id
/// </summary>
/// <param name="id"></param>
/// <param name="byteSize"></param>
/// <returns></returns>
public KeyChainItem AddNewRandomKey(string id)
{
KeyChainItem returnValue = new KeyChainItem(id, SymmetricCipherPair.AutogenerateRijndael());
this.KeyStore.SaveItem(returnValue);
return(returnValue);
}
/// <summary>
/// this will write the cipher pair (json serialized) to file
/// </summary>
/// <param name="filePath"></param>
public CipherPairFile(string filePath, SymmetricCipherPair pair)
: base()
{
Condition.Requires(pair).IsNotNull();
this.LockedFile = new LockedFile(filePath);
this.Save();
}
/// <summary>
/// given a symmetric crypto alg and some seed data, generates a key and IV
/// </summary>
/// <param name="algorithm"></param>
/// <param name="password"></param>
/// <param name="salt"></param>
/// <returns></returns>
public static SymmetricCipherPair GenerateKeyIV(SymmetricAlgorithm algorithm, string password, string salt)
{
DeriveBytes rgb = new Rfc2898DeriveBytes(password, Encoding.Unicode.GetBytes(salt));
byte[] rgbKey = rgb.GetBytes(algorithm.KeySize >> 3);
byte[] rgbIV = rgb.GetBytes(algorithm.BlockSize >> 3);
SymmetricCipherPair cp = new SymmetricCipherPair(rgbKey, rgbIV, algorithm);
return(cp);
}
public static Func <string, string> GetSymmetricDecodingStrategy(this SymmetricCipherPair cp)
{
return((x) => { return cp.Decrypt(x); });
}
public static EncryptedStringableDecoration Encrypt(this IStringable thing, SymmetricCipherPair cipherPair)
{
Condition.Requires(thing).IsNotNull();
return(new EncryptedStringableDecoration(thing, cipherPair));
}
public EncryptedStringableDecoration(IStringable decorated, SymmetricCipherPair cipherPair)
: base(decorated)
{
Condition.Requires(cipherPair).IsNotNull();
this.CipherPair = cipherPair;
}
public static EncryptedStringableDecoration Encrypt(this IStringable thing, SymmetricCipherPair cipherPair)
{
Condition.Requires(thing).IsNotNull();
return new EncryptedStringableDecoration(thing, cipherPair);
}
public EncryptedStringableDecoration(IStringable decorated, SymmetricCipherPair cipherPair)
: base(decorated)
{
Condition.Requires(cipherPair).IsNotNull();
this.CipherPair = cipherPair;
}
/// <summary>
/// given a symmetric crypto alg and some seed data, generates a key and IV
/// </summary>
/// <param name="algorithm"></param>
/// <param name="password"></param>
/// <param name="salt"></param>
/// <returns></returns>
public static SymmetricCipherPair GenerateKeyIV(SymmetricAlgorithm algorithm, string password, string salt)
{
DeriveBytes rgb = new Rfc2898DeriveBytes(password, Encoding.Unicode.GetBytes(salt));
byte[] rgbKey = rgb.GetBytes(algorithm.KeySize >> 3);
byte[] rgbIV = rgb.GetBytes(algorithm.BlockSize >> 3);
SymmetricCipherPair cp = new SymmetricCipherPair(rgbKey, rgbIV, algorithm);
return cp;
}
