[英]How to CBC Blowfish encrypt with non hex IV
我對加密的工作原理相當陌生,但是,有人要求我使用 Blowfish CBC 加密來加密和解密一個值。 現在我在這上面花了相當長的時間,我認為我做對了,直到他們把他們希望我使用的 IV 寄給我,這讓我很困惑。 我的印象是 IV 必須是十六進制值,但是,他們向我發送了一個看起來類似於: cl5PxDOt
的 IV。
我設法生成的代碼如下所示:
function Run()
{
var key = "enter your key";
var value = "Enter your test value";
var iv = StringToByteArray("enter your 16 char hex value");
var encryptedValue = CbcBlowfishEncrypt(value, key, iv);
var decryptedValue = CbcBlowfishDecrypt(encryptedValue, key, iv);
}
private string CbcBlowfishEncrypt(string strValue, string key, byte[] iv)
{
byte[] inputBytes = Encoding.UTF8.GetBytes(strValue);
BlowfishEngine engine = new BlowfishEngine();
CbcBlockCipher blockCipher = new CbcBlockCipher(engine);
PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(blockCipher);
KeyParameter keyParam = new KeyParameter(Convert.FromBase64String(key));
ParametersWithIV keyParamWithIV = new ParametersWithIV(keyParam, iv, 0, 8);
cipher.Init(true, keyParamWithIV);
byte[] outputBytes = new byte[cipher.GetOutputSize(inputBytes.Length)];
int length = cipher.ProcessBytes(inputBytes, outputBytes, 0);
cipher.DoFinal(outputBytes, length); //Do the final block
var c = BitConverter.ToString(outputBytes);
string encryptedInput = Convert.ToBase64String(outputBytes);
var result = BitConverter.ToString(outputBytes).Replace("-", "");
return result;
}
private string CbcBlowfishDecrypt(string strValue, string key, byte[] iv)
{
BlowfishEngine engine = new BlowfishEngine();
CbcBlockCipher blockCipher = new CbcBlockCipher(engine);
PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(blockCipher);
KeyParameter keyParam = new KeyParameter(Convert.FromBase64String(key));
ParametersWithIV keyParamWithIV = new ParametersWithIV(keyParam, iv, 0, 8);
cipher.Init(false, keyParamWithIV);
byte[] out1 = Hex.Decode(strValue);
byte[] out2 = new byte[cipher.GetOutputSize(out1.Length)];
int len2 = cipher.ProcessBytes(out1, 0, out1.Length, out2, 0);
cipher.DoFinal(out2, len2);
return Encoding.UTF8.GetString(out2);
}
public static byte[] StringToByteArray(string hex)
{
return Enumerable.Range(0, hex.Length)
.Where(x => x % 2 == 0)
.Select(x => Convert.ToByte(hex.Substring(x, 2), 16))
.ToArray();
}
我希望有人能告訴我如何修改上面的代碼以使用以下示例 iv: cl5PxDOt
。
編輯:這是我嘗試過的,但每次我都會pad block corrupted
:
var newIv = "cl5PxDOt";
var newByteIv = newIv.ToArray().Select(Convert.ToByte).ToArray();
var newDecryptedValue = CbcBlowfishDecrypt(ospToken, key, newByteIv);
//var newDecryptedValue = Encoding.UTF8.GetBytes(newIv) -- Also tried this, but same result.
在 Org.BouncyCastle.Crypto.Paddings.Pkcs7Padding.PadCount(Byte[] 輸入)
在 Org.BouncyCastle.Crypto.Paddings.PaddedBufferedBlockCipher.DoFinal(Byte[] output, Int32 outOff)
如果密鑰不是 Base64 解碼但 UTF-8 編碼,即在CbcBlowfishDecrypt()
(和CbcBlowfishEncrypt()
)中,則可以解密密文
KeyParameter keyParam = new KeyParameter(Convert.FromBase64String(key));
將被替換為
KeyParameter keyParam = new KeyParameter(Encoding.UTF8.GetBytes(key));
UTF-8 編碼的密鑰長度為 448 位,因此是一個有效密鑰( Blowfish定義為 32 到 448 位之間的密鑰長度)。
IV 可以是 UTF-8 以模擬方式編碼,而不是當前的實現。
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