private static string RandomSaltTextDecryption(string textToDecrypt, string encryptionPassKey)
{
// Hash the password with SHA256
byte[] passwordBytes = Encoding.UTF8.GetBytes(encryptionPassKey);
passwordBytes = SHA256.Create().ComputeHash(passwordBytes);
// Get bytes from base64 encoded bytes
byte[] textBytes = Convert.FromBase64String(textToDecrypt);
byte[] bytesDecrypted = new AES256SaltEncryptionLibrary.AESEncryption().Decrypt(textBytes, passwordBytes);
// Remove salt
int saltLength = GetSaltLength();
byte[] resultBytes = new byte[bytesDecrypted.Length - saltLength];
for (int i = 0; i < resultBytes.Length; i++)
{
resultBytes[i] = bytesDecrypted[i + saltLength];
}
string result = Encoding.UTF8.GetString(resultBytes);
return(result);
}
private static string RandomSaltTextEncryption(string textToEncrypt, string encryptionPassKey)
{
// Hash the password with SHA256
byte[] passwordBytes = Encoding.UTF8.GetBytes(encryptionPassKey);
passwordBytes = SHA256.Create().ComputeHash(passwordBytes);
// Get the bytes of the string
byte[] bytesToBeEncrypted = Encoding.UTF8.GetBytes(textToEncrypt);
// Get salt for random encryption
byte[] baSalt = GetRandomBytes();
byte[] baEncrypted = new byte[baSalt.Length + bytesToBeEncrypted.Length];
// Combine Salt + Text
for (int i = 0; i < baSalt.Length; i++)
{
baEncrypted[i] = baSalt[i];
}
for (int i = 0; i < textToEncrypt.Length; i++)
{
baEncrypted[i + baSalt.Length] = bytesToBeEncrypted[i];
}
byte[] bytesEncrypted = new AES256SaltEncryptionLibrary.AESEncryption().Encrypt(baEncrypted, passwordBytes);
string result = Convert.ToBase64String(bytesEncrypted);
return(result);
}
public static string DecryptText(string textToDecrypt, string encryptionPassKey)
{
// Get the bytes of the string
byte[] bytesToBeDecrypted = Convert.FromBase64String(textToDecrypt);
byte[] passwordBytes = Encoding.UTF8.GetBytes(encryptionPassKey);
passwordBytes = SHA256.Create().ComputeHash(passwordBytes);
byte[] bytesDecrypted = new AES256SaltEncryptionLibrary.AESEncryption().Decrypt(bytesToBeDecrypted, passwordBytes);
string result = Encoding.UTF8.GetString(bytesDecrypted);
return(result);
}
private static string EncryptText(string textToEncrypt, string encryptionPassKey)
{
// Get the bytes of the string
byte[] bytesToBeEncrypted = Encoding.UTF8.GetBytes(textToEncrypt);
byte[] passwordBytes = Encoding.UTF8.GetBytes(encryptionPassKey);
// Get salt for random encryption
byte[] baSalt = GetRandomBytes();
byte[] baEncrypted = new byte[baSalt.Length + textToEncrypt.Length];
// Hash the password with SHA256
passwordBytes = SHA256.Create().ComputeHash(passwordBytes);
byte[] bytesEncrypted = new AES256SaltEncryptionLibrary.AESEncryption().Encrypt(bytesToBeEncrypted, passwordBytes);
string result = Convert.ToBase64String(bytesEncrypted);
return(result);
}
