我正在尝试使用以下属性解密已在Java中加密的字符串（Java代码）
public static Builder getDefaultBuilder(String key, String salt, byte[] iv) {
return new Builder()
.setIv(iv)
.setKey(key)
.setSalt(salt)
.setKeyLength(128)
.setKeyAlgorithm("AES")
.setCharsetName("UTF8")
.setIterationCount(1)
.setDigestAlgorithm("SHA1")
.setBase64Mode(Base64.DEFAULT)
.setAlgorithm("AES/CBC/PKCS5Padding")
.setSecureRandomAlgorithm("SHA1PRNG")
.setSecretKeyType("PBKDF2WithHmacSHA1");
}
到目前为止这是我的代码（C＃）
public string DecryptText(string encryptedString)
{
using (myRijndael = new RijndaelManaged())
{
myRijndael.Key = Convert.FromBase64String(encryptionKey);
myRijndael.IV = new byte[16];
myRijndael.Mode = CipherMode.CBC;
myRijndael.Padding = PaddingMode.PKCS7;
Byte[] ourEnc = Convert.FromBase64String(encryptedString);
string ourDec = DecryptStringFromBytes(ourEnc, myRijndael.Key, myRijndael.IV);
return ourDec;
}
}
protected string DecryptStringFromBytes(byte[] cipherText, byte[] Key, byte[] IV)
{
// Check arguments.
if (cipherText == null || cipherText.Length <= 0)
throw new ArgumentNullException("cipherText");
if (Key == null || Key.Length <= 0)
throw new ArgumentNullException("Key");
if (IV == null || IV.Length <= 0)
throw new ArgumentNullException("Key");
// Declare the string used to hold
// the decrypted text.
string plaintext = null;
// Create an RijndaelManaged object
// with the specified key and IV.
using (RijndaelManaged rijAlg = new RijndaelManaged())
{
rijAlg.Key = Key;
rijAlg.IV = IV;
// Create a decrytor to perform the stream transform.
ICryptoTransform decryptor = rijAlg.CreateDecryptor(rijAlg.Key, rijAlg.IV);
// Create the streams used for decryption.
using (MemoryStream msDecrypt = new MemoryStream(cipherText))
{
using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
using (StreamReader srDecrypt = new StreamReader(csDecrypt))
{
// Read the decrypted bytes from the decrypting stream
// and place them in a string.
plaintext = srDecrypt.ReadToEnd();
}
}
}
}
return plaintext;
}
但是当我尝试解密时，我得到以下异常“System.Security.Cryptography.CryptographicException：'指定的密钥不是此算法的有效大小。 ”。
Java代码的起源在这里https://github.com/simbiose/Encryption/blob/master/Encryption/main/se/simbio/encryption/Encryption.java
这是加密时的Java代码
public String encrypt(String data) throws UnsupportedEncodingException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidAlgorithmParameterException, InvalidKeyException, InvalidKeySpecException, BadPaddingException, IllegalBlockSizeException {
if (data == null) return null;
SecretKey secretKey = getSecretKey(hashTheKey(mBuilder.getKey()));
byte[] dataBytes = data.getBytes(mBuilder.getCharsetName());
Cipher cipher = Cipher.getInstance(mBuilder.getAlgorithm());
cipher.init(Cipher.ENCRYPT_MODE, secretKey, mBuilder.getIvParameterSpec(), mBuilder.getSecureRandom());
return Base64.encodeToString(cipher.doFinal(dataBytes), mBuilder.getBase64Mode());
}
private SecretKey getSecretKey(char[] key) throws NoSuchAlgorithmException, UnsupportedEncodingException, InvalidKeySpecException {
SecretKeyFactory factory = SecretKeyFactory.getInstance(mBuilder.getSecretKeyType());
KeySpec spec = new PBEKeySpec(key, mBuilder.getSalt().getBytes(mBuilder.getCharsetName()), mBuilder.getIterationCount(), mBuilder.getKeyLength());
SecretKey tmp = factory.generateSecret(spec);
return new SecretKeySpec(tmp.getEncoded(), mBuilder.getKeyAlgorithm());
}
private char[] hashTheKey(String key) throws UnsupportedEncodingException, NoSuchAlgorithmException {
MessageDigest messageDigest = MessageDigest.getInstance(mBuilder.getDigestAlgorithm());
messageDigest.update(key.getBytes(mBuilder.getCharsetName()));
return Base64.encodeToString(messageDigest.digest(), Base64.NO_PADDING).toCharArray();
}
我已经在这两天苦苦挣扎，因为我没有真正使用加密工作，所以任何帮助都将非常感激。
谢谢！
更新：全班
public sealed class MyCryptoClass
{
protected RijndaelManaged myRijndael;
private static string encryptionKey = "random";
// Singleton pattern used here with ensured thread safety
protected static readonly MyCryptoClass _instance = new MyCryptoClass();
public static MyCryptoClass Instance
{
get { return _instance; }
}
public MyCryptoClass()
{
}
public string DecryptText(string encryptedString)
{
using (myRijndael = new RijndaelManaged())
{
myRijndael.Key = Convert.FromBase64String(encryptionKey);
myRijndael.IV = new byte[16];
myRijndael.Mode = CipherMode.CBC;
myRijndael.Padding = PaddingMode.PKCS7;
Byte[] ourEnc = Convert.FromBase64String(encryptedString);
string ourDec = DecryptStringFromBytes(ourEnc, myRijndael.Key, myRijndael.IV);
return ourDec;
}
}
public string EncryptText(string plainText)
{
using (myRijndael = new RijndaelManaged())
{
myRijndael.Key = HexStringToByte(encryptionKey);
myRijndael.IV = HexStringToByte(initialisationVector);
myRijndael.Mode = CipherMode.CBC;
myRijndael.Padding = PaddingMode.PKCS7;
byte[] encrypted = EncryptStringToBytes(plainText, myRijndael.Key, myRijndael.IV);
string encString = Convert.ToBase64String(encrypted);
return encString;
}
}
protected byte[] EncryptStringToBytes(string plainText, byte[] Key, byte[] IV)
{
// Check arguments.
if (plainText == null || plainText.Length <= 0)
throw new ArgumentNullException("plainText");
if (Key == null || Key.Length <= 0)
throw new ArgumentNullException("Key");
if (IV == null || IV.Length <= 0)
throw new ArgumentNullException("Key");
byte[] encrypted;
// Create an RijndaelManaged object
// with the specified key and IV.
using (RijndaelManaged rijAlg = new RijndaelManaged())
{
rijAlg.Key = Key;
rijAlg.IV = IV;
// Create a decrytor to perform the stream transform.
ICryptoTransform encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);
// Create the streams used for encryption.
using (MemoryStream msEncrypt = new MemoryStream())
{
using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
{
using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
{
//Write all data to the stream.
swEncrypt.Write(plainText);
}
encrypted = msEncrypt.ToArray();
}
}
}
// Return the encrypted bytes from the memory stream.
return encrypted;
}
protected string DecryptStringFromBytes(byte[] cipherText, byte[] Key, byte[] IV)
{
// Check arguments.
if (cipherText == null || cipherText.Length <= 0)
throw new ArgumentNullException("cipherText");
if (Key == null || Key.Length <= 0)
throw new ArgumentNullException("Key");
if (IV == null || IV.Length <= 0)
throw new ArgumentNullException("Key");
// Declare the string used to hold
// the decrypted text.
string plaintext = null;
// Create an RijndaelManaged object
// with the specified key and IV.
using (RijndaelManaged rijAlg = new RijndaelManaged())
{
rijAlg.Key = Key;
rijAlg.IV = IV;
// Create a decrytor to perform the stream transform.
ICryptoTransform decryptor = rijAlg.CreateDecryptor(rijAlg.Key, rijAlg.IV);
// Create the streams used for decryption.
using (MemoryStream msDecrypt = new MemoryStream(cipherText))
{
using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
using (StreamReader srDecrypt = new StreamReader(csDecrypt))
{
// Read the decrypted bytes from the decrypting stream
// and place them in a string.
plaintext = srDecrypt.ReadToEnd();
}
}
}
}
return plaintext;
}
public static void GenerateKeyAndIV()
{
// This code is only here for an example
RijndaelManaged myRijndaelManaged = new RijndaelManaged();
myRijndaelManaged.Mode = CipherMode.CBC;
myRijndaelManaged.Padding = PaddingMode.PKCS7;
myRijndaelManaged.GenerateIV();
myRijndaelManaged.GenerateKey();
string newKey = ByteArrayToHexString(myRijndaelManaged.Key);
string newinitVector = ByteArrayToHexString(myRijndaelManaged.IV);
}
protected static byte[] HexStringToByte(string hexString)
{
try
{
int bytesCount = (hexString.Length) / 2;
byte[] bytes = new byte[bytesCount];
for (int x = 0; x < bytesCount; ++x)
{
bytes[x] = Convert.ToByte(hexString.Substring(x * 2, 2), 16);
}
return bytes;
}
catch
{
throw;
}
}
public static string ByteArrayToHexString(byte[] ba)
{
StringBuilder hex = new StringBuilder(ba.Length * 2);
foreach (byte b in ba)
hex.AppendFormat("{0:x2}", b);
return hex.ToString();
}
}
MyCryptoClass.encryptionKey对应于你的Encryption.Builder.mKey，你必须在C＃侧生成密钥，即你必须在C＃端实现这个过程中涉及的每个Java方法的对应物。这些Java方法是getSecretKey(char[] key)，hashTheKey(String key)和third.part.android.util.Base64.encodeToString(byte[] input, int flags)。getSecretKey(char[] key)：
private static byte[] GetSecretKey()
{
string hashedKey = GetHashedKey();
byte[] saltBytes = Encoding.UTF8.GetBytes(salt); // builder.mCharsetName = "UTF8";
int iterations = 1; // builder.mIterationCount = 1
byte[] secretKey = null;
using (Rfc2898DeriveBytes rfc2898 = new Rfc2898DeriveBytes(hashedKey, saltBytes, iterations)) // builder.mSecretKeyType = "PBKDF2WithHmacSHA1";
{
secretKey = rfc2898.GetBytes(16); // builder.mKeyLength = 128;
//Console.WriteLine("Key: " + ByteArrayToHexString(secretKey));
}
return secretKey;
}
此方法使用PBKDF2WithHmacSHA1导出密钥，密钥，salt，iterationcount和密钥长度作为输入。这里使用的密钥（更确切地说是密码）是MyCryptoClass.encryptionKey提供的GetHashedKey()的base64编码的SHA1哈希（见下文）。hashTheKey(String key)：
private static string GetHashedKey()
{
string hashBase64 = String.Empty;
using (SHA1Managed sha1 = new SHA1Managed()) // builder.mDigestAlgorithm = "SHA1";
{
byte[] hash = sha1.ComputeHash(Encoding.UTF8.GetBytes(encryptionKey)); // builder.mCharsetName = "UTF8";
hashBase64 = Base64ThirdPartAndroid(hash, true);
//Console.WriteLine("Hash (base64): " + hashBase64);
}
return hashBase64;
}
这个方法从SHA1和hash64编码派生MyCryptoClass.encryptionKey-hash。对于base64编码，使用方法Base64ThirdPartAndroid(byte[] arr, bool withoutPadding)（见下文）。third.part.android.util.Base64.encodeToString(byte[] input, int flags)（https://github.com/simbiose/Encryption/blob/master/Encryption/main/third/part/android/util/Base64.java）：
private static string Base64ThirdPartAndroid(byte[] arr, bool withoutPadding)
{
string base64String = System.Convert.ToBase64String(arr);
if (withoutPadding) base64String = base64String.TrimEnd('='); // Remove trailing "="-characters
base64String += "\n"; // Append LF (10)
//Console.WriteLine("Array as base64 encoded string: " + base64String);
return base64String;
}
在Java代码中，third.part.android.util.Base64.encodeToString(byte[] input, int flags)与flags = Base64.NO_PADDING一起使用，它删除了base64编码字符串末尾的“=”字符。另外，附加换行符（LF，\n，ASCII值：10）。如果使用的Base64-Encoding不删除“=” - 字符或没有终止换行符，则解密将失败，因为散列是后来生成的密钥的基础，必须在加密和解密方面。据我所知，C＃端没有Base64编码，具有必要的特性。但是，如果有这样的编码，你当然可以使用它。MyCryptoClass class。encryptionKey）将静态字段initialisationVector，salt和secretKey添加到MyCryptoClass-class并为测试目的分配以下值：
private static string encryptionKey = "A7zb534OPq59gU7q";
private static string salt = "JV5k9GoH";
private static byte[] initialisationVector = Encoding.UTF8.GetBytes("l4iG63jN9Dcg6537");
private static byte[] secretKey = GetSecretKey();
参数的类型对应于Java代码中的类型（encryptionKey和salt是字符串，initialisationVector是字节数组）。 GetSecretKey()生成的密钥存储在字节数组secretKey中。DecryptText-和EncryptText方法中设置myRijndael.Key和myRijndael.IV到
myRijndael.Key = secretKey;
myRijndael.IV = initialisationVector;
encrypt方法加密以下纯文本：
Test: The quick brown fox jumps over the lazy dog...
使用上面的键/ salt / iv
mBuilder = Builder.getDefaultBuilder("A7zb534OPq59gU7q","JV5k9GoH","l4iG63jN9Dcg6537".getBytes("UTF-8"));
加密文本是：
mL4ajZtdRgD8CtGSfJGkT24Ebw4SrGUGKQI6bvBw1ziCO/J7SeLiyIw41zumTHMMD9GOYK+kR79CVcpoaHT9TQ==
使用C＃DecryptText方法对此进行解密再次给出了纯文本。以下是两个测试用例：
static void Main(string[] args)
{
// Test 1: Encrypted text from C#
MyCryptoClass mcc = MyCryptoClass.Instance;
string encryptedText = mcc.EncryptText("This is a plain text which needs to be encrypted...");
Console.WriteLine("Encrypted text (base64): " + encryptedText);
string decryptedText = mcc.DecryptText(encryptedText);
Console.WriteLine("Decrypted text: " + decryptedText);
// Test 2: Encrypted text from Java
string javaEncryptedText = "mL4ajZtdRgD8CtGSfJGkT24Ebw4SrGUGKQI6bvBw1ziCO/J7SeLiyIw41zumTHMMD9GOYK+kR79CVcpoaHT9TQ==";
Console.WriteLine("Encrypted text from Java (base64): " + javaEncryptedText);
string javaDecryptedText = mcc.DecryptText(javaEncryptedText);
Console.WriteLine("Decrypted text from Java: " + javaDecryptedText);
}
以下是完整的C＃类，我能够工作，因为它像java类目前我只检查加密部分
public sealed class MyCryptoClass
{
protected AesManaged myRijndael;
private static string encryptionKey = "MyKey";
private static string salt = "Mysalt";
private static byte[] initialisationVector = new byte[16];
//private static byte[] initialisationVector = Encoding.UTF8.GetBytes("l4iG63jN9Dcg6537");
private static byte[] secretKey = GetSecretKey();
// Singleton pattern used here with ensured thread safety
protected static readonly MyCryptoClass _instance = new MyCryptoClass();
public static MyCryptoClass Instance
{
get { return _instance; }
}
public MyCryptoClass()
{
}
public string DecryptText(string encryptedString)
{
using (myRijndael = new AesManaged())
{
myRijndael.Key = Convert.FromBase64String(encryptionKey);
myRijndael.IV = new byte[16];
myRijndael.Mode = CipherMode.CBC;
myRijndael.Padding = PaddingMode.PKCS7;
Byte[] ourEnc = Convert.FromBase64String(encryptedString);
string ourDec = DecryptStringFromBytes(ourEnc, myRijndael.Key, myRijndael.IV);
return ourDec;
}
}
public string EncryptText(string plainText)
{
using (myRijndael = new AesManaged())
{
myRijndael.Key = secretKey;
myRijndael.IV = initialisationVector;
myRijndael.Mode = CipherMode.CBC;
myRijndael.Padding = PaddingMode.PKCS7;
byte[] encrypted = EncryptStringToBytes(plainText, myRijndael.Key, myRijndael.IV);
string encString = Convert.ToBase64String(encrypted);
return encString;
}
}
protected byte[] EncryptStringToBytes(string plainText, byte[] Key, byte[] IV)
{
// Check arguments.
if (plainText == null || plainText.Length <= 0)
throw new ArgumentNullException("plainText");
if (Key == null || Key.Length <= 0)
throw new ArgumentNullException("Key");
if (IV == null || IV.Length <= 0)
throw new ArgumentNullException("Key");
byte[] encrypted;
// Create an RijndaelManaged object
// with the specified key and IV.
using (RijndaelManaged rijAlg = new RijndaelManaged())
{
rijAlg.Key = Key;
rijAlg.IV = IV;
// Create a decrytor to perform the stream transform.
ICryptoTransform encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);
// Create the streams used for encryption.
using (MemoryStream msEncrypt = new MemoryStream())
{
using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
{
using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
{
//Write all data to the stream.
swEncrypt.Write(plainText);
}
encrypted = msEncrypt.ToArray();
}
}
}
// Return the encrypted bytes from the memory stream.
return encrypted;
}
protected string DecryptStringFromBytes(byte[] cipherText, byte[] Key, byte[] IV)
{
// Check arguments.
if (cipherText == null || cipherText.Length <= 0)
throw new ArgumentNullException("cipherText");
if (Key == null || Key.Length <= 0)
throw new ArgumentNullException("Key");
if (IV == null || IV.Length <= 0)
throw new ArgumentNullException("Key");
// Declare the string used to hold
// the decrypted text.
string plaintext = null;
// Create an RijndaelManaged object
// with the specified key and IV.
using (RijndaelManaged rijAlg = new RijndaelManaged())
{
rijAlg.Key = Key;
rijAlg.IV = IV;
// Create a decrytor to perform the stream transform.
ICryptoTransform decryptor = rijAlg.CreateDecryptor(rijAlg.Key, rijAlg.IV);
// Create the streams used for decryption.
using (MemoryStream msDecrypt = new MemoryStream(cipherText))
{
using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
using (StreamReader srDecrypt = new StreamReader(csDecrypt))
{
// Read the decrypted bytes from the decrypting stream
// and place them in a string.
plaintext = srDecrypt.ReadToEnd();
}
}
}
}
return plaintext;
}
public static void GenerateKeyAndIV()
{
// This code is only here for an example
AesManaged myRijndaelManaged = new AesManaged();
myRijndaelManaged.Mode = CipherMode.CBC;
myRijndaelManaged.Padding = PaddingMode.PKCS7;
myRijndaelManaged.GenerateIV();
myRijndaelManaged.GenerateKey();
string newKey = ByteArrayToHexString(myRijndaelManaged.Key);
string newinitVector = ByteArrayToHexString(myRijndaelManaged.IV);
}
protected static byte[] HexStringToByte(string hexString)
{
try
{
int bytesCount = (hexString.Length) / 2;
byte[] bytes = new byte[bytesCount];
for (int x = 0; x < bytesCount; ++x)
{
bytes[x] = Convert.ToByte(hexString.Substring(x * 2, 2), 16);
}
return bytes;
}
catch
{
throw;
}
}
public static string ByteArrayToHexString(byte[] ba)
{
StringBuilder hex = new StringBuilder(ba.Length * 2);
foreach (byte b in ba)
hex.AppendFormat("{0:x2}", b);
return hex.ToString();
}
private static byte[] GetSecretKey()
{
string hashedKey = GetHashedKey();
byte[] saltBytes = Encoding.UTF8.GetBytes(salt); // builder.mCharsetName = "UTF8";
int iterations = 1; // builder.mIterationCount = 1
byte[] secretKey = null;
using (Rfc2898DeriveBytes rfc2898 = new Rfc2898DeriveBytes(hashedKey, saltBytes, iterations)) // builder.mSecretKeyType = "PBKDF2WithHmacSHA1";
{
secretKey = rfc2898.GetBytes(16); // builder.mKeyLength = 128;
//Console.WriteLine("Key: " + ByteArrayToHexString(secretKey));
}
return secretKey;
}
private static string GetHashedKey()
{
string hashBase64 = String.Empty;
using (SHA1Managed sha1 = new SHA1Managed()) // builder.mDigestAlgorithm = "SHA1";
{
byte[] hash = sha1.ComputeHash(Encoding.UTF8.GetBytes(encryptionKey)); // builder.mCharsetName = "UTF8";
hashBase64 = Base64ThirdPartAndroid(hash, true);
//hashBase64 = Base64ThirdPartAndroid(hash, true);
//Console.WriteLine("Hash (base64): " + hashBase64);
}
return hashBase64;
}
private static string Base64ThirdPartAndroid(byte[] arr, bool withoutPadding)
{
string base64String = System.Convert.ToBase64String(arr);
if (withoutPadding) base64String = base64String.TrimEnd('='); // Remove trailing "="-characters
base64String += "\n"; // Append LF (10)
//Console.WriteLine("Array as base64 encoded string: " + base64String);
return base64String;
}
}