1.我有java函数,它加密xml文件并返回加密的字符串。
/// Java Class
import java.security.Key;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Base64;
public class Crypt {
public static String key = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
public static byte[] key_Array = Base64.decodeBase64(key);
public static String encrypt(String strToEncrypt)
{
try
{
//Cipher _Cipher = Cipher.getInstance("AES");
//Cipher _Cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");
//Cipher _Cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
Key SecretKey = new SecretKeySpec(key_Array, "AES");
Cipher _Cipher = Cipher.getInstance("AES");
_Cipher.init(Cipher.ENCRYPT_MODE, SecretKey);
return Base64.encodeBase64String(_Cipher.doFinal(strToEncrypt.getBytes()));
}
catch (Exception e)
{
System.out.println("[Exception]:"+e.getMessage());
}
return null;
}
public static void main(String[] args) {
StringBuilder sb = new StringBuilder();
sb.append("xml file string ...");
String EncryptedString = encrypt(sb.toString());
System.out.println("[EncryptedString]:"+EncryptedString);
}
}
2.我有c#函数,它可以解密由java函数加密的消息。
/// C# Function
private static string Decrypt(string encryptedText)
{
RijndaelManaged aesEncryption = new RijndaelManaged();
aesEncryption.BlockSize = 256;
//aesEncryption.KeySize = 256;
//aesEncryption.Mode = CipherMode.CBC;
//aesEncryption.Padding = PaddingMode.PKCS7;
string keyStr = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
//string ivStr = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
byte[] keyArr = Convert.FromBase64String(keyStr);
//byte[] ivArr = Convert.FromBase64String(ivStr);
aesEncryption.Key = keyArr;
//aesEncryption.IV = ivArr;
ICryptoTransform decrypto = aesEncryption.CreateDecryptor();
byte[] encryptedBytes = Convert.FromBase64CharArray(encryptedText.ToCharArray(), 0, encryptedText.Length);
byte[] decryptedData = decrypto.TransformFinalBlock(encryptedBytes, 0, encryptedBytes.Length); /// CryptographicException: Length of the data to decrypt is invalid.
return ASCIIEncoding.UTF8.GetString(decryptedData);
}
Java加密功能运行良好。但问题是C函数,
当我解密时,会得到下面的错误消息
CryptographicException: Length of the data to decrypt is invalid.
我使用下面的参考搜索解决方案
但我仍然面临同样的错误。谁能给我提个建议吗。
我只是改变我的C#加密功能。下面是我的更改列表
/// Updated decrypt function
private static string Decrypt(string encryptedText)
{
RijndaelManaged aesEncryption = new RijndaelManaged();
aesEncryption.BlockSize = 128;
aesEncryption.KeySize = 256;
//aesEncryption.Mode = CipherMode.CBC;
aesEncryption.Padding = PaddingMode.None;
string keyStr = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
string ivStr = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
byte[] ivArr = Convert.FromBase64String(ivStr);
byte[] IVkey16BytesValue = new byte[16];
Array.Copy(ivArr, IVkey16BytesValue, 16);
byte[] keyArr = Convert.FromBase64String(keyStr);
byte[] KeyArr32BytesValue = new byte[32];
Array.Copy(keyArr, KeyArr32BytesValue, 32);
aesEncryption.IV = IVkey16BytesValue;
aesEncryption.Key = KeyArr32BytesValue;
ICryptoTransform decrypto = aesEncryption.CreateDecryptor();
byte[] encryptedBytes = Convert.FromBase64CharArray(encryptedText.ToCharArray(), 0, encryptedText.Length);
byte[] decryptedData = decrypto.TransformFinalBlock(encryptedBytes, 0, encryptedBytes.Length);
return ASCIIEncoding.UTF8.GetString(decryptedData);
}
在这段时间内,没有发生错误。但我得到解密的消息,我无法阅读。
g:�\0�\td��Y\\符O����\rL��W�wHm�>f�\au����%��0��\ ..........
请让我再听听你的建议。
在我最近的一个项目中,我的任务是建立一个带有加密部分的url,以传递到另一个网站。他们在服务器上运行java,而我们是用c#开发的。
我知道这与您的任务不完全相符,但希望这能帮助其他试图找到答案的人:)
我从他们的开发人员那里收到了以下内容,用于构建我们的加密
为了在c#中实现这一点,我做了以下操作:
public String Encrypt(String plainText, String key)
{
var plainBytes = Encoding.UTF8.GetBytes(plainText);
return Convert.ToBase64String(Encrypt(plainBytes, GetRijndaelManaged(key)));
}
private RijndaelManaged GetRijndaelManaged(String secretKey)
{
var keyBytes = new byte[16];
var secretKeyBytes = Encoding.ASCII.GetBytes(secretKey);
Array.Copy(secretKeyBytes, keyBytes, Math.Min(keyBytes.Length, secretKeyBytes.Length));
return new RijndaelManaged
{
Mode = CipherMode.ECB,
Padding = PaddingMode.PKCS7,
KeySize = 128,
BlockSize = 128,
Key = keyBytes,
IV = keyBytes
};
}
private byte[] Encrypt(byte[] plainBytes, RijndaelManaged rijndaelManaged)
{
return rijndaelManaged.CreateEncryptor()
.TransformFinalBlock(plainBytes, 0, plainBytes.Length);
}
我认为块大小应该是128,键大小应该是256。keyStr应该是32个字符长,IVStr应该是16个字符长。这可能会有所帮助,因为它描述了为什么128位必须用于块大小以及密钥大小可以是什么。csrc.nist.gov/publications/fips/fips197/fips-197.pdf
你在解密方法中有这个。
aesEncryption.Padding = PaddingMode.None;
我相信你也需要把它放在加密方法中。
还有,为什么不将此方法用于键和IV。
aes.Key = ASCIIEncoding.ASCII.GetBytes(keyStr);
aes.IV = ASCIIEncoding.ASCII.GetBytes(ivStr);
当我从@deathismyfriend和其他人那里得到非常有用的建议后,我发现了我在C#Decrypt函数中缺少的内容。所以我改变我的函数如下。
/// C# Error Fixed Version - CipherMode.ECB
public static string keyStr = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
private static string Encrypt(string PlainText)
{
RijndaelManaged aes = new RijndaelManaged();
aes.BlockSize = 128;
aes.KeySize = 256;
/// In Java, Same with below code
/// Cipher _Cipher = Cipher.getInstance("AES"); // Java Code
aes.Mode = CipherMode.ECB;
byte[] keyArr = Convert.FromBase64String(keyStr);
byte[] KeyArrBytes32Value = new byte[32];
Array.Copy(keyArr, KeyArrBytes32Value, 32);
aes.Key = KeyArrBytes32Value;
ICryptoTransform encrypto = aes.CreateEncryptor();
byte[] plainTextByte = ASCIIEncoding.UTF8.GetBytes(PlainText);
byte[] CipherText = encrypto.TransformFinalBlock(plainTextByte, 0, plainTextByte.Length);
return Convert.ToBase64String(CipherText);
}
private static string Decrypt(string CipherText)
{
RijndaelManaged aes = new RijndaelManaged();
aes.BlockSize = 128;
aes.KeySize = 256;
/// In Java, Same with below code
/// Cipher _Cipher = Cipher.getInstance("AES"); // Java Code
aes.Mode = CipherMode.ECB;
byte[] keyArr = Convert.FromBase64String(keyStr);
byte[] KeyArrBytes32Value = new byte[32];
Array.Copy(keyArr, KeyArrBytes32Value, 32);
aes.Key = KeyArrBytes32Value;
ICryptoTransform decrypto = aes.CreateDecryptor();
byte[] encryptedBytes = Convert.FromBase64CharArray(CipherText.ToCharArray(), 0, CipherText.Length);
byte[] decryptedData = decrypto.TransformFinalBlock(encryptedBytes, 0, encryptedBytes.Length);
return ASCIIEncoding.UTF8.GetString(decryptedData);
}
通过使用上c#函数,现在我可以解密和读取密码文本<下面是我一次又一次出错后发现的情况
CryptographicException: Padding is invalid and cannot be removed.
Solution:
_RijndaelManaged.Padding = CipherMode.xxx; ///should toggle here
_RijndaelManaged.Padding = PaddingMode.xxx; ///should toggle here
CryptographicException: Length of the data to decrypt is invalid.
CryptographicException: Specified initialization vector (IV) does not match the block size for this algorithm.
Solution
1. _RijndaelManaged.BlockSize = 128; /// Must be
2. _RijndaelManaged.KeySize = 256; /// Must be
3. _RijndaelManaged.Key = Byte Array Size must be 32 in length ( more detail 32*8 = 256 KeySize )
4. _RijndaelManaged.IV = Byte Array Size must be 16 in length ( more detail 16*8 = 128 BlockSize)
但是当涉及到安全原因时,我认为我不应该使用欧洲央行模式。根据
所以我用Java和C再次修改了它。
// Java code - Cipher mode CBC version.
// CBC version need Initialization vector IV.
// Reference from https://stackoverflow.com/questions/6669181/why-does-my-aes-encryption-throws-an-invalidkeyexception/6669812#6669812
import java.security.Key;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Base64;
public class CryptoSecurity {
public static String key = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
public static byte[] key_Array = Base64.decodeBase64(key);
public static String encrypt(String strToEncrypt)
{
try
{
//Cipher _Cipher = Cipher.getInstance("AES");
//Cipher _Cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");
Cipher _Cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
// Initialization vector.
// It could be any value or generated using a random number generator.
byte[] iv = { 1, 2, 3, 4, 5, 6, 6, 5, 4, 3, 2, 1, 7, 7, 7, 7 };
IvParameterSpec ivspec = new IvParameterSpec(iv);
Key SecretKey = new SecretKeySpec(key_Array, "AES");
_Cipher.init(Cipher.ENCRYPT_MODE, SecretKey, ivspec);
return Base64.encodeBase64String(_Cipher.doFinal(strToEncrypt.getBytes()));
}
catch (Exception e)
{
System.out.println("[Exception]:"+e.getMessage());
}
return null;
}
public static String decrypt(String EncryptedMessage)
{
try
{
//Cipher _Cipher = Cipher.getInstance("AES");
//Cipher _Cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");
Cipher _Cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
// Initialization vector.
// It could be any value or generated using a random number generator.
byte[] iv = { 1, 2, 3, 4, 5, 6, 6, 5, 4, 3, 2, 1, 7, 7, 7, 7 };
IvParameterSpec ivspec = new IvParameterSpec(iv);
Key SecretKey = new SecretKeySpec(key_Array, "AES");
_Cipher.init(Cipher.DECRYPT_MODE, SecretKey, ivspec);
byte DecodedMessage[] = Base64.decodeBase64(EncryptedMessage);
return new String(_Cipher.doFinal(DecodedMessage));
}
catch (Exception e)
{
System.out.println("[Exception]:"+e.getMessage());
}
return null;
}
public static void main(String[] args) {
// TODO Auto-generated method stub
StringBuilder sb = new StringBuilder();
sb.append("xml file string ...");
String outputOfEncrypt = encrypt(sb.toString());
System.out.println("[CryptoSecurity.outputOfEncrypt]:"+outputOfEncrypt);
String outputOfDecrypt = decrypt(outputOfEncrypt);
//String outputOfDecrypt = decrypt(sb.toString());
System.out.println("[CryptoSecurity.outputOfDecrypt]:"+outputOfDecrypt);
}
}
在C#中,我对其进行如下修改。
// C# Code, CipherMode.CBC
// CBC version need Initialization vector IV.
public static string keyStr = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
private static string Encrypt(string PlainText)
{
RijndaelManaged aes = new RijndaelManaged();
aes.BlockSize = 128;
aes.KeySize = 256;
// It is equal in java
/// Cipher _Cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
aes.Mode = CipherMode.CBC;
aes.Padding = PaddingMode.PKCS7;
byte[] keyArr = Convert.FromBase64String(keyStr);
byte[] KeyArrBytes32Value = new byte[32];
Array.Copy(keyArr, KeyArrBytes32Value, 32);
// Initialization vector.
// It could be any value or generated using a random number generator.
byte[] ivArr = { 1, 2, 3, 4, 5, 6, 6, 5, 4, 3, 2, 1, 7, 7, 7, 7 };
byte[] IVBytes16Value = new byte[16];
Array.Copy(ivArr, IVBytes16Value, 16);
aes.Key = KeyArrBytes32Value;
aes.IV = IVBytes16Value;
ICryptoTransform encrypto = aes.CreateEncryptor();
byte[] plainTextByte = ASCIIEncoding.UTF8.GetBytes(PlainText);
byte[] CipherText = encrypto.TransformFinalBlock(plainTextByte, 0, plainTextByte.Length);
return Convert.ToBase64String(CipherText);
}
private static string Decrypt(string CipherText)
{
RijndaelManaged aes = new RijndaelManaged();
aes.BlockSize = 128;
aes.KeySize = 256;
aes.Mode = CipherMode.CBC;
aes.Padding = PaddingMode.PKCS7;
byte[] keyArr = Convert.FromBase64String(keyStr);
byte[] KeyArrBytes32Value = new byte[32];
Array.Copy(keyArr, KeyArrBytes32Value, 32);
// Initialization vector.
// It could be any value or generated using a random number generator.
byte[] ivArr = { 1, 2, 3, 4, 5, 6, 6, 5, 4, 3, 2, 1, 7, 7, 7, 7 };
byte[] IVBytes16Value = new byte[16];
Array.Copy(ivArr, IVBytes16Value, 16);
aes.Key = KeyArrBytes32Value;
aes.IV = IVBytes16Value;
ICryptoTransform decrypto = aes.CreateDecryptor();
byte[] encryptedBytes = Convert.FromBase64CharArray(CipherText.ToCharArray(), 0, CipherText.Length);
byte[] decryptedData = decrypto.TransformFinalBlock(encryptedBytes, 0, encryptedBytes.Length);
return ASCIIEncoding.UTF8.GetString(decryptedData);
}
现在一切都好了
有关AES的更多详细信息,请单击@deathismyfriend提供的此链接<它也非常有用。
问题内容: 1.我有java函数来加密xml文件并返回加密的字符串。 2.我有c#函数可以解密通过java函数加密的消息。 Java加密功能运行良好。但是问题是C#函数, 当我解密时出现以下错误消息 我通过使用下面的参考来搜索解决方案 Java中的AES加密和C#中的解密 C#/ Java | AES256加密/解密 C#和Java中的加密/解密 但我仍然遇到同样的错误。有人可以给我建议吗? 更新
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