[英]Decode C# generated AES IV and KEY in Java
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);
}
}
样本完成密钥:SENTUkR2QjZ1ZjBYV0o2aXNCcnRqQT09LDJpdTZHMUpWYm0rbTQ2Njl6ZG83Z2c9PQ==
在 Java 中,我如何解码 completeKey 以获得 IV 和 Key。我使用了下面的代码,并且 Key 和 IV 不是 128 位,我的加密失败了。
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==
}
}
您的 IV 和密钥首先被编码为 Base64 字符串,然后与“,”作为分隔符连接,生成的字符串被转换为字节数组,最后是 Base64 编码。
以下程序正在反向执行,最后您会找到一个(正确)长度为 16 字节的 IV 和一个长度为 16 字节 = 128 位的 AES 密钥 - 两者都适用于 CBC 模式下的 AES 加密。
安全警告:这种传输密钥的方式在大多数情况下都是不安全的,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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