python 和 java 加解密互转

主要解决python 加密，java 解密 ，或者 java 加密，python 解密 

python demo--cryptography 版本

# 导入库

pip install cryptography

import base64
from cryptography.hazmat.primitives.ciphers.aead import AESGCM

aes_key = '1d35eefc2b8207d615028d056ce5296c'
associatedData = "12345"
nonce = "1234567812345678"

# 加密
def st_aes_en_func():
    de_data = '1234561234565'
    aesgcm = AESGCM(aes_key.encode())
    ct = aesgcm.encrypt(nonce.encode(), de_data.encode(), associatedData.encode())
    return base64.b64encode(ct).decode('utf-8')

# 解密
def st_aes_de_func():
    en_data = 'X3lkQaqdASpIF0+XsOjwUhfCZdvXh3RQFXsH8o8='
    en_data = base64.b64decode(en_data.encode('utf-8'))
    aesgcm = AESGCM(aes_key.encode())
    ct = aesgcm.decrypt(nonce.encode(), en_data, associatedData.encode())
    return ct.decode()

java 版本

package tools;

import java.io.IOException;
import java.security.GeneralSecurityException;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.util.Base64;
import javax.crypto.Cipher;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.GCMParameterSpec;
import javax.crypto.spec.SecretKeySpec;

public class AesUtil {
    static final int KEY_LENGTH_BYTE = 32;
    static final int TAG_LENGTH_BIT = 128;
    private final byte[] aesKey;

    public AesUtil(byte[] key) {
        if (key.length != KEY_LENGTH_BYTE) {
            throw new IllegalArgumentException("无效的ApiV3Key，长度必须为32个字节");
        }
        this.aesKey = key;
    }

    public String decryptToString(byte[] associatedData, byte[] nonce, String ciphertext)
            throws GeneralSecurityException, IOException {
        try {
            Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding");

            SecretKeySpec key = new SecretKeySpec(aesKey, "AES");
            GCMParameterSpec spec = new GCMParameterSpec(TAG_LENGTH_BIT, nonce);

            cipher.init(Cipher.DECRYPT_MODE, key, spec);
            cipher.updateAAD(associatedData);

            return new String(cipher.doFinal(Base64.getDecoder().decode(ciphertext)), "utf-8");
        } catch (NoSuchAlgorithmException | NoSuchPaddingException e) {
            throw new IllegalStateException(e);
        } catch (InvalidKeyException | InvalidAlgorithmParameterException e) {
            throw new IllegalArgumentException(e);
        }
    }

    public String encryptToString(byte[] associatedData, byte[] nonce, String ciphertext)
            throws GeneralSecurityException, IOException{
        try {
            Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding");

            SecretKeySpec key = new SecretKeySpec(aesKey, "AES");
            GCMParameterSpec spec = new GCMParameterSpec(TAG_LENGTH_BIT, nonce);

            cipher.init(Cipher.ENCRYPT_MODE, key, spec);
            cipher.updateAAD(associatedData);

//            return new String(cipher.doFinal(Base64.getDecoder().decode(ciphertext)), "utf-8");
            return new String(Base64.getEncoder().encode(cipher.doFinal(ciphertext.getBytes())), "utf-8");
        } catch (NoSuchAlgorithmException | NoSuchPaddingException e) {
            throw new IllegalStateException(e);
        } catch (InvalidKeyException | InvalidAlgorithmParameterException e) {
            throw new IllegalArgumentException(e);
        }
    }
    public static void main(String[] args) throws Exception {
        String key = "1d35eefc2b8207d615028d056ce5296c";
        String associatedData = "12345";
        String nonce = "1234567812345678";
        AesUtil aesUtils = new AesUtil(key.getBytes());

        String enData = aesUtils.encryptToString(associatedData.getBytes(), nonce.getBytes(), "1234561234565");
        System.out.println("加密后密文：" + enData);
        String deData = aesUtils.decryptToString(associatedData.getBytes(), nonce.getBytes(), enData);
        System.out.println("解密后明文：" + deData);

    }

}