java 实现AES CCM模式
时间: 2023-03-03 07:39:28 浏览: 88
Java中可以使用JCA(Java Cryptography Architecture)来实现AES CCM模式的加密和解密。下面是一个简单的示例代码:
```
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.GCMParameterSpec;
public class AESCCMExample {
public static void main(String[] args) throws Exception {
byte[] key = hexStringToByteArray("00112233445566778899AABBCCDDEEFF");
byte[] nonce = hexStringToByteArray("112233445566778899AABBCC");
byte[] plaintext = "Hello World".getBytes("UTF-8");
// create a cipher object and initialize it for encryption
Cipher cipher = Cipher.getInstance("AES/CCM/NoPadding", "BC");
SecretKeySpec keySpec = new SecretKeySpec(key, "AES");
GCMParameterSpec paramSpec = new GCMParameterSpec(128, nonce);
cipher.init(Cipher.ENCRYPT_MODE, keySpec, paramSpec);
// encrypt the plaintext
byte[] ciphertext = cipher.doFinal(plaintext);
// initialize the cipher for decryption
cipher.init(Cipher.DECRYPT_MODE, keySpec, paramSpec);
// decrypt the ciphertext and print the result
byte[] decryptedText = cipher.doFinal(ciphertext);
System.out.println(new String(decryptedText, "UTF-8"));
}
public static byte[] hexStringToByteArray(String s) {
int len = s.length();
byte[] data = new byte[len / 2];
for (int i = 0; i < len; i += 2) {
data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4)
+ Character.digit(s.charAt(i+1), 16));
}
return data;
}
}
```
在这个示例中,我们使用了Bouncy Castle作为我们的JCA提供者,可以在代码中看到`Cipher.getInstance("AES/CCM/NoPadding", "BC")`。我们还需要提供AES加密所需的密钥和CCM模式所需的nonce值。然后,我们使用Cipher对象进行加密和解密,并将结果打印到控制台上。
需要注意的是,在实际使用中,需要根据具体的加密需求对参数进行更改,例如CCM模式需要设置nonce长度为7-13字节,并且需要根据加密算法的要求调整密钥长度等参数。