Created
December 8, 2017 09:41
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.NET Core 2 Encrypt/Decrypt String
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| public static void Main(string[] args) | |
| { | |
| var content = "Example test"; | |
| var key = "E546C8DF278CD5931069B522E695D4F2"; | |
| var encrypted = EncryptString(content, key); | |
| Console.WriteLine(encrypted); | |
| var decrypted = DecryptString(encrypted, key); | |
| Console.WriteLine(decrypted); | |
| Console.ReadLine(); | |
| } | |
| public static string EncryptString(string text, string keyString) | |
| { | |
| var key = Encoding.UTF8.GetBytes(keyString); | |
| using (var aesAlg = Aes.Create()) | |
| { | |
| using (var encryptor = aesAlg.CreateEncryptor(key, aesAlg.IV)) | |
| { | |
| using (var msEncrypt = new MemoryStream()) | |
| { | |
| using (var csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write)) | |
| using (var swEncrypt = new StreamWriter(csEncrypt)) | |
| { | |
| swEncrypt.Write(text); | |
| } | |
| var iv = aesAlg.IV; | |
| var decryptedContent = msEncrypt.ToArray(); | |
| var result = new byte[iv.Length + decryptedContent.Length]; | |
| Buffer.BlockCopy(iv, 0, result, 0, iv.Length); | |
| Buffer.BlockCopy(decryptedContent, 0, result, iv.Length, decryptedContent.Length); | |
| return Convert.ToBase64String(result); | |
| } | |
| } | |
| } | |
| } | |
| public static string DecryptString(string cipherText, string keyString) | |
| { | |
| var fullCipher = Convert.FromBase64String(cipherText); | |
| var iv = new byte[16]; | |
| var cipher = new byte[16]; | |
| Buffer.BlockCopy(fullCipher, 0, iv, 0, iv.Length); | |
| Buffer.BlockCopy(fullCipher, iv.Length, cipher, 0, iv.Length); | |
| var key = Encoding.UTF8.GetBytes(keyString); | |
| using (var aesAlg = Aes.Create()) | |
| { | |
| using (var decryptor = aesAlg.CreateDecryptor(key, iv)) | |
| { | |
| string result; | |
| using (var msDecrypt = new MemoryStream(cipher)) | |
| { | |
| using (var csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read)) | |
| { | |
| using (var srDecrypt = new StreamReader(csDecrypt)) | |
| { | |
| result = srDecrypt.ReadToEnd(); | |
| } | |
| } | |
| } | |
| return result; | |
| } | |
| } | |
| } |
The key sizes need to be 128, 192 or 256 bits. Since the code above reads bytes from a UTF8 string min key length is 16 characters, 24 and 32 chars lengths will also work. Anything else will throw an exception
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Use this as encryption key: "E546C8DF278CD5931069B522E695D4F2".
It will work for me now after updating key.