public EncryptedData Encrypt(EncryptionStrength strength, string str)
{
if (string.IsNullOrWhiteSpace(str))
{
return(new EncryptedData {
IsEmpty = true
});
}
var hash = Hash(strength, str, false);
var ekey = _encryptionKey;
using (var aes = Aes.Create())
{
aes.Key = Convert.FromBase64String(ekey);
var encrypted = AesEncryption.EncryptStringToBytes_Aes(str, aes.Key, aes.IV);
var result = new byte[aes.IV.Length + encrypted.Length];
aes.IV.CopyTo(result, 0);
encrypted.CopyTo(result, 16);
return(new EncryptedData
{
IsEmpty = false,
Hash = hash,
Encrypted = Convert.ToBase64String(result)
});
}
}
public string GenerateRandomKey(EncryptionStrength strength, bool alphaNumericOnly = true)
{
switch (strength)
{
case EncryptionStrength.Sha256:
var hmac256 = new HMACSHA256();
string key256 = Convert.ToBase64String(hmac256.Key);
if (alphaNumericOnly)
{
key256 = string.Join("", key256.Where(char.IsLetterOrDigit));
}
return(key256);
case EncryptionStrength.Sha512:
var hmac512 = new HMACSHA512();
string key512 = Convert.ToBase64String(hmac512.Key);
if (alphaNumericOnly)
{
key512 = string.Join("", key512.Where(char.IsLetterOrDigit));
}
return(key512);
default:
throw new ArgumentOutOfRangeException(nameof(strength), strength, null);
}
}
public string Hash(EncryptionStrength strength, string source, bool caseInsensitive)
{
var hkey = _hashKey;
if (caseInsensitive)
{
source = source?.ToUpperInvariant();
}
switch (strength)
{
case EncryptionStrength.Sha256:
return(HmacSha256Hash.GetHash(source, hkey));
case EncryptionStrength.Sha512:
return(HmacSha512Hash.GetHash(source, hkey));
default:
throw new ArgumentOutOfRangeException(nameof(strength), strength, null);
}
}
