java加密,使用python解密 ,使用 pysm4 报 byte greater than 16的解决方法

1,业务需要,对方需要用java进行参数加密,双方约定使用的加密方法是 SM4,对方给的key是32位,并且给出了加解密的java代码。

import org.bouncycastle.jce.provider.BouncyCastleProvider;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.SecureRandom;
import java.security.Security;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.spec.SecretKeySpec;
import org.bouncycastle.pqc.math.linearalgebra.ByteUtils;

/**
 * sm4加密算法工具类
 */
public class SM4Util {

    static {
        Security.addProvider(new BouncyCastleProvider());
    }

    private static final String ENCODING = "UTF-8";
    public static final String ALGORITHM_NAME = "SM4";
    // 加密算法/分组加密模式/分组填充方式
    // PKCS5Padding-以8个字节为一组进行分组加密
    // 定义分组加密模式使用:PKCS5Padding
    public static final String ALGORITHM_NAME_ECB_PADDING = "SM4/ECB/PKCS5Padding";
    // 128-32位16进制;256-64位16进制
    public static final int DEFAULT_KEY_SIZE = 128;

    /**
     * 生成ECB暗号
     * @explain ECB模式(电子密码本模式:Electronic codebook)
     * @param algorithmName
     *            算法名称
     * @param mode
     *            模式
     * @param key
     * @return
     * @throws Exception
     */
    private static Cipher generateEcbCipher(String algorithmName, int mode, byte[] key) throws Exception {
        Cipher cipher = Cipher.getInstance(algorithmName, BouncyCastleProvider.PROVIDER_NAME);
        Key sm4Key = new SecretKeySpec(key, ALGORITHM_NAME);
        cipher.init(mode, sm4Key);
        return cipher;
    }

    /**
     * 自动生成密钥
     * @explain
     * @return
     * @throws NoSuchAlgorithmException
     * @throws NoSuchProviderException
     */
    public static String generateKey() throws Exception {
        return generateKey(DEFAULT_KEY_SIZE);
    }

    /**
     * @explain
     * @param keySize
     * @return
     * @throws Exception
     */
    public static String generateKey(int keySize) throws Exception {
        KeyGenerator kg = KeyGenerator.getInstance(ALGORITHM_NAME, BouncyCastleProvider.PROVIDER_NAME);
        kg.init(keySize, new SecureRandom());
        return ByteUtils.toHexString(kg.generateKey().getEncoded());
    }

    /**
     * sm4加密
     * @explain 加密模式:ECB
     *          密文长度不固定,会随着被加密字符串长度的变化而变化
     * @param hexKey
     *            16进制密钥(忽略大小写)
     * @param paramStr
     *            待加密字符串
     * @return 返回16进制的加密字符串
     * @throws Exception
     */
    public static String encryptEcb(String hexKey, String paramStr) throws Exception {
        String cipherText = "";
        // 16进制字符串-->byte[]
        byte[] keyData = ByteUtils.fromHexString(hexKey);
        // String-->byte[]
        byte[] srcData = paramStr.getBytes(ENCODING);
        // 加密后的数组
        byte[] cipherArray = encryptEcbPadding(keyData, srcData);
        // byte[]-->hexString
        cipherText = ByteUtils.toHexString(cipherArray);
        return cipherText;
    }

    /**
     * 加密模式之Ecb
     * @explain
     * @param key
     * @param data
     * @return
     * @throws Exception
     */
    public static byte[] encryptEcbPadding(byte[] key, byte[] data) throws Exception {
        Cipher cipher = generateEcbCipher(ALGORITHM_NAME_ECB_PADDING, Cipher.ENCRYPT_MODE, key);
        return cipher.doFinal(data);
    }

    /**
     * sm4解密
     * @explain 解密模式:采用ECB
     * @param hexKey
     *            16进制密钥
     * @param cipherText
     *            16进制的加密字符串(忽略大小写)
     * @return 解密后的字符串
     * @throws Exception
     */
    public static String decryptEcb(String hexKey, String cipherText) throws Exception {
        // 用于接收解密后的字符串
        String decryptStr = "";
        // hexString-->byte[]
        byte[] keyData = ByteUtils.fromHexString(hexKey);
        // hexString-->byte[]
        byte[] cipherData = ByteUtils.fromHexString(cipherText);
        // 解密
        byte[] srcData = decryptEcbPadding(keyData, cipherData);
        // byte[]-->String
        decryptStr = new String(srcData, ENCODING);
        return decryptStr;
    }

    /**
     * 解密
     * @explain
     * @param key
     * @param cipherText
     * @return
     * @throws Exception
     */
    public static byte[] decryptEcbPadding(byte[] key, byte[] cipherText) throws Exception {
        Cipher cipher = generateEcbCipher(ALGORITHM_NAME_ECB_PADDING, Cipher.DECRYPT_MODE, key);
        return cipher.doFinal(cipherText);
    }

    public static void main(String[] args) {
        try {
            String generateKey = SM4Util.generateKey();
            System.out.println(generateKey);
            String json = "mate60 nb";
            // 自定义的32位16进制密钥
            String key = "2c1f9b9388c5fc713c5ceab2af6f0f2d";
            String encrypted = SM4Util.encryptEcb(key, json);
            System.out.println(encrypted);
            json = SM4Util.decryptEcb(key, encrypted);
            System.out.println(json);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

2,这边用的后台程序python+flask只能用python去解密,先使用pysm4

from pysm4 import encrypt_ecb, decrypt_ecb
plain_text = '13800138000'
key = '86C63*80C2806E*1F47B8*9DE501215*'
cipher_text = encrypt_ecb(plain_text, key)

plain_text == decrypt_ecb(cipher_text, key)

报  Parameter key or iv:********* byte greater than 16的错误,应该是有个地方配置key的长度。

3,但是对方也只能支持32位的方法,所以只能换方法,测试了一下,下面python方法可以完美支持32位,并且测试和java加密,python解密后也相同。

python实现sm4,ecb模式加密_python sm4_pchaoda的博客-CSDN博客

你可能感兴趣的:(python,开发语言)