如何解决用Java解码C#生成的AES IV和KEY
在C#中,他们使用以下代码生成密钥。
using System;
using System.Text;
using System.Security.Cryptography;
public class Program
{
public static void Main()
{
var aesEncryption = new RijndaelManaged
{
KeySize = 128,BlockSize = 128,Mode = CipherMode.CBC,Padding = PaddingMode.PKCS7
};
aesEncryption.GenerateIV();
string ivStr = Convert.ToBase64String(aesEncryption.IV);
aesEncryption.GenerateKey();
string keyStr = Convert.ToBase64String(aesEncryption.Key);
string completeKey = Convert.ToBase64String(ASCIIEncoding.UTF8.GetBytes(ivStr + "," + keyStr));
// Console.WriteLine(completeKey);
}
}
示例完成密钥:SENTUkR2QjZ1ZjBYV0o2aXNCcnRqQT09LDJpdTZHMUpWYm0rbTQ2Njl6ZG83Z2c9PQ ==
在Java中,我如何解码completeKey以获取IV和Key。我使用下面的代码,并且Key和IV不是128位,并且加密失败。
import java.util.Base64;
public class HelloWorld{
public static void main(String []args){
String originalInput = "SENTUkR2QjZ1ZjBYV0o2aXNCcnRqQT09LDJpdTZHMUpWYm0rbTQ2Njl6ZG83Z2c9PQ==";
String decodedString = new String(Base64.getDecoder().decode(originalInput.getBytes()));
String[] arrOfStr = decodedString.split(",",2);
String iv=arrOfStr[0];
String key=arrOfStr[1];
System.out.println(decodedString);//HCSRDvB6uf0XWJ6isBrtjA==,2iu6G1JVbm+m4669zdo7gg==
System.out.println(iv);//HCSRDvB6uf0XWJ6isBrtjA==
System.out.println(key);//2iu6G1JVbm+m4669zdo7gg==
}
}
解决方法
您的IV和密钥首先被编码为Base64-Strings,然后以','作为分隔符进行连接,结果字符串被转换为字节数组,然后最终被Base64编码。
下面的程序向后进行,最后您找到一个IV(长度为16字节)和一个AES密钥(长度为16字节= 128位)-两者都适用于CBC模式下的AES加密。
安全警告:在大多数情况下,这种传输密钥的方式都是不安全,因此以下代码仅用于教育目的。
结果:
Decode C# generated AES IV and KEY in Java
ivStr: k7ivGm6OoMHRlnk4tZCAMA==
ivExp: k7ivGm6OoMHRlnk4tZCAMA==
keyStr: Lq5wkaGWFknsEKUxoAY46w==
keyExp: Lq5wkaGWFknsEKUxoAY46w==
iv length: 16 data: 93b8af1a6e8ea0c1d1967938b5908030
key length: 16 data: 2eae7091a1961649ec10a531a00638eb
代码:
import java.util.Base64;
public class Main {
public static void main(String[] args) {
System.out.println("Decode C# generated AES IV and KEY in Java");
// https://stackoverflow.com/questions/63503753/decode-c-sharp-generated-aes-iv-and-key-in-java
/* dataset
iv:k7ivGm6OoMHRlnk4tZCAMA==
key: Lq5wkaGWFknsEKUxoAY46w==
azdpdkdtNk9vTUhSbG5rNHRaQ0FNQT09LExxNXdrYUdXRmtuc0VLVXhvQVk0Nnc9PQ==
*/
String originalInput = "azdpdkdtNk9vTUhSbG5rNHRaQ0FNQT09LExxNXdrYUdXRmtuc0VLVXhvQVk0Nnc9PQ==";
byte[] originalInputByte = Base64.getDecoder().decode(originalInput);
String decodedString = new String(originalInputByte);
String[] arrOfStr = decodedString.split(",",2);
String ivStr = arrOfStr[0];
String keyStr = arrOfStr[1];
System.out.println("ivStr: " + ivStr);
System.out.println("ivExp: " + "k7ivGm6OoMHRlnk4tZCAMA==");
System.out.println("keyStr: " + keyStr);
System.out.println("keyExp: " + "Lq5wkaGWFknsEKUxoAY46w==");
// final conversion to byte[]
byte[] iv = Base64.getDecoder().decode(ivStr);
byte[] key = Base64.getDecoder().decode(keyStr);
System.out.println("iv length: " + iv.length + " data: " + bytesToHex(iv));
System.out.println("key length: " + key.length + " data: " + bytesToHex(key));
}
private static String bytesToHex(byte[] bytes) {
StringBuffer result = new StringBuffer();
for (byte b : bytes) result.append(Integer.toString((b & 0xff) + 0x100,16).substring(1));
return result.toString();
}
}
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